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Developmental characteristics and geological significance of the bentonite in the Upper Ordovician Wufeng–Lower Silurian Longmaxi Formation in eastern Sichuan Basin,SW China 预览
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作者 WANG Yuman LI Xinjing +4 位作者 WANG Hao JIANG Shan CHEN Bo MA Jie DAI Bing 《石油勘探与开发:英文版》 2019年第4期687-700,共14页
Based on the Qiliao section of the Upper Ordovician Wufeng Formation – Lower Silurian Longmaxi Formation in Shizhu, Chongqing city, the development characteristics of bentonite in eastern Sichuan Basin was examined s... Based on the Qiliao section of the Upper Ordovician Wufeng Formation – Lower Silurian Longmaxi Formation in Shizhu, Chongqing city, the development characteristics of bentonite in eastern Sichuan Basin was examined systematically, and its geological significance and scientific value were analyzed. The main understandings are as follows:(1) Six bentonite dense layers were found in the Qiliao section, mainly occurring in 6 graptolitic belts of the Katian, Rhuddanian and Aeronian. Most of the bentonite dense layers showed obvious increase in clay, peak response of GR curve, and indistinct relationship between volcanic ash and total organic carbon(TOC).(2) The bentonite dense layers of Longmaxi Formation were widely distributed in eastern Sichuan Basin and its periphery, and generally showed GR peak, which can be an important reference interface for dividing the bottom boundary of the Coronograptus cyphus belt and the top boundary of the Rhuddanian in eastern Sichuan Basin and western Hubei province.(3) Taking the bentonite dense layers as the stratification basis of the Rhuddanian and Aeronian, it was determined that the sediment thickness of the Rhuddanian in the eastern Sichuan depression was generally 10–40 m, but only the upper part of the Coronograptus cyphus belt was deposited in the hinderland of Yichang Uplift, and the sedimentary thickness was only 3–7 m.(4) In the hinderland of the Yichang Uplift, at least five and a half graptolitic belts were missing in Wufeng Formation – Rhuddanian, and the deposition time of Rhuddanian was less than 0.4 Ma.(5) The bentonite dense layers were important sedimentary responses to the strong deflection of the Yangtze basin at the turn of the Ordovician–Silurian, which suggested that four tectonic activity periods existed in the eastern Sichuan depression, including the early stage of the depression, the middle-late stage of the depression, the early stage of the foreland flexure and the development stage of the foreland flexure. The high-quality shale was mainly d 展开更多
关键词 Sichuan Basin Qiliao Section Lower SILURIAN Longmaxi Formation BENTONITE Yichang UPLIFT depression behind the UPLIFT organic-rich shale
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隧道仰拱隆起规律及影响因素分析
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作者 李英槐 邓洪亮 +1 位作者 王迪 马岩 《施工技术》 CAS 2019年第7期118-121,共4页
依托北京兴延高速梯子峪隧道工程,建立了隧道三维有限元模型对隧道的结构进行了应力和应变分析,并用实测数据作对比,研究了隧道仰拱隆起的主要影响因素和变化规律,结果表明:仰拱隆起的主要影响因素为仰拱厚度和地应力。当地应力不变时,... 依托北京兴延高速梯子峪隧道工程,建立了隧道三维有限元模型对隧道的结构进行了应力和应变分析,并用实测数据作对比,研究了隧道仰拱隆起的主要影响因素和变化规律,结果表明:仰拱隆起的主要影响因素为仰拱厚度和地应力。当地应力不变时,隧道仰拱的最大隆起量随着仰拱厚度的增加而减少。在不同的地应力条件下,仰拱厚度对仰拱最大隆起量的影响不同。地应力越大,仰拱最大隆起量随着仰拱厚度的增加,变化幅度越大。当仰拱厚度不变时,隧道仰拱的最大隆起量随着地应力的增加而增加。在不同的仰拱厚度条件下,地应力对仰拱最大隆起量的影响不同。仰拱厚度越大,仰拱最大隆起量随着地应力的增加,变化幅度越小。 展开更多
关键词 隧道 仰拱 隆起 应力 监测 数值模拟
公路路堑下穿既有高速铁路桥梁的影响研究 预览
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作者 孟繁增 《高速铁路技术》 2019年第4期70-75,共6页
文章以某新建公路路堑下穿既有高速铁路桥梁为工程背景,分别采用改进的分层总和法和弹塑性三维有限元仿真分析方法研究新建公路路堑下穿对既有高速铁路桥墩隆起变形的影响;进一步在施工过程中,采用自动化监测与人工监测两种方式对既有... 文章以某新建公路路堑下穿既有高速铁路桥梁为工程背景,分别采用改进的分层总和法和弹塑性三维有限元仿真分析方法研究新建公路路堑下穿对既有高速铁路桥墩隆起变形的影响;进一步在施工过程中,采用自动化监测与人工监测两种方式对既有高速铁路竖向变形开展测量工作,获得了亚毫米级精度的可信数据。最后对计算结果与监测数据进行对比分析,分析结果可为类似工程提供经验借鉴。 展开更多
关键词 路堑 运营 高速铁路 桥梁 隆起
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冷轧用钢隆起缺陷原因分析与控制 预览
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作者 白东明 《河北冶金》 2019年第10期66-68,共3页
针对河钢唐钢1810线供冷轧用钢(DD11)深加工时容易产生隆起缺陷的问题,通过现场统计,研究隆起的位置、特征,系统分析了热轧、冷轧工艺过程对隆起缺陷的影响。研究认为,冷轧卷产生隆起缺陷主要与原料卷的局部高点有关。从河钢唐钢1810线... 针对河钢唐钢1810线供冷轧用钢(DD11)深加工时容易产生隆起缺陷的问题,通过现场统计,研究隆起的位置、特征,系统分析了热轧、冷轧工艺过程对隆起缺陷的影响。研究认为,冷轧卷产生隆起缺陷主要与原料卷的局部高点有关。从河钢唐钢1810线实际装备条件出发,通过合理优化编排轧制计划、严格控制轧辊使用吨位及公里数、设置合理的轧辊原始凸度、严格执行轧制带钢冷却制度,避免了热轧带钢形成过大的局部高点,从而使供冷轧用钢隆起缺陷大幅降低,产品质量满足冷轧需求。 展开更多
关键词 热轧带钢 冷轧 隆起 局部高点 凸度
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Continental drift, plateau uplift, and the evolutions of monsoon and arid regions in Asia, Africa, and Australia during the Cenozoic
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作者 Xiaodong LIU Buwen DONG +2 位作者 Zhi-Yong YIN Robin S. SMITH Qingchun GUO 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2019年第7期1053-1075,共23页
Monsoon and arid regions in the Asia-Africa-Australia (A-A-A) realm occupy more than 60% of the total area of these continents. Geological evidence showed that significant changes occurred to the A-A-A environments of... Monsoon and arid regions in the Asia-Africa-Australia (A-A-A) realm occupy more than 60% of the total area of these continents. Geological evidence showed that significant changes occurred to the A-A-A environments of the monsoon and arid regions, the land-ocean configuration in the Eastern Hemisphere, and the topography of the Tibetan Plateau (TP) in the Cenozoic. Motivated by this background, numerical experiments for 5 typical geological periods during the Cenozoic were conducted using a coupled ocean-atmosphere general circulation model to systemically explore the formations and evolutionary histories of the Ceno zoic A-A-A monso on and arid regions un der the influences of contine ntal drift and plateau uplift. Results of the nu merical experime nts indicate that the timings and causes of the formations of monsoon and arid regi ons in the A-A-A realm were very different. The northern and southern African monsoons existed during the mid-Paleocene, while the South Asian monsoon appeared in the Eocene after the Indian Subcontinent moved into the tropical Northern Hemisphere. In contrast, the East Asian mon soon and northern Australian monso on were established much later in the Miocene. The establishment of the tropical monsoons in northern and southern Africa, South Asia, and Australia were determined by both the continental drift and seas onal migratio n of the In ter-Tropical Convergence Zone (ITCZ), while the position and height of the TP were the key factor for the establishment of the East Asian monsoon. The presence of the subtropical arid regions in northern and southern Africa, Asia, and Australia depended on the positions of the continents and the control of the planetary scale subtropical high pressure zones, while the arid regions in the Arabian Peninsula and West Asia were closely related to the retreat of the Paratethys Sea. The formation of the mid-latitude arid region in the Asian interior, on the other hand, was the consequence of the uplift of the TP. These results from this study provide insi 展开更多
关键词 CENOZOIC MONSOON REGION ARID REGION Continental drift Tibetan Plateau UPLIFT Climate simulation
河套盆地第四纪沉积古地理特征及演化
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作者 吴利杰 张翼龙 +4 位作者 石建省 李政红 王文中 王丽娟 于娟 《干旱区资源与环境》 CSSCI CSCD 北大核心 2019年第8期135-145,共11页
通过对河套盆地1100条钻孔资料的岩性岩相综合分析,探讨了该区第四纪沉积相特征及古地理环境演变过程。研究认为:早更新世-中更新世早期,临河凹陷以湖泊沉积环境为主,三湖河凹陷以河流沉积环境为主,呼和凹陷为局限性河湖沉积环境,西山... 通过对河套盆地1100条钻孔资料的岩性岩相综合分析,探讨了该区第四纪沉积相特征及古地理环境演变过程。研究认为:早更新世-中更新世早期,临河凹陷以湖泊沉积环境为主,三湖河凹陷以河流沉积环境为主,呼和凹陷为局限性河湖沉积环境,西山咀隆起与包头隆起都以古隆起剥蚀为主,全盆地沉积环境为局限性河湖,中更新世早期黄河已流入该盆地;中更新世晚期-晚更新世早期,全盆地形成了内陆封闭性咸水-半咸水湖盆,黄河为内流河;自晚更新世中晚期以后,随黄河逐渐外流,河套地区进入到准平原化过程,由湖泊沉积转为以冲积作用为主的河湖交替演化,最终以河流及山前冲洪积作用为主。晚第四纪河套盆地东西部沉积环境差异受区域构造及沉积古地理格局的控制。 展开更多
关键词 凹陷 隆起 沉积相 古地理 古湖泊 河套盆地
可液化土层中地下结构上浮及其控制措施 预览
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作者 王文章 廖晨聪 +2 位作者 周香莲 张中杰 张擎宇 《地震工程与工程振动》 CSCD 北大核心 2019年第3期159-167,共9页
地震荷载引起的饱和土体液化会导致地下结构上浮,利用一种水-土耦合本构,对液化土层中地下结构上浮及其控制措施展开研究。建立了有限元模型,模拟得到不同地震强度作用下模型加速度、超孔压(比)、上浮位移等结果,模拟并分析采取不同地... 地震荷载引起的饱和土体液化会导致地下结构上浮,利用一种水-土耦合本构,对液化土层中地下结构上浮及其控制措施展开研究。建立了有限元模型,模拟得到不同地震强度作用下模型加速度、超孔压(比)、上浮位移等结果,模拟并分析采取不同地基处理措施对结构上浮的控制作用。结果表明该本构能模拟可液化土层中地下结构动力响应,随着地震强度的增大,土体液化深度会发展;地下结构上浮分别由土体液化和土体振动引起,且前者是造成结构破坏的主要原因;抗拔桩法、倒滤层减压法以及换填法均可改善地下结构上浮情况,其中换填法和抗拔桩法控制上浮效果较好。 展开更多
关键词 地震液化 地下结构 数值分析 超孔压比 上浮
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Uplift,climate and biotic changes at the Eocene-Oligocene transition in south-eastern Tibet
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作者 Tao Su Robert A. Spicer +13 位作者 Shi-Hu Li He Xu Jian Huang Sarah Sherlock Yong-Jiang Huang Shu-Feng Li Li Wang Lin-Bo Jia Wei-Yu-Dong Deng Jia Liu Cheng-Long Deng Shi-Tao Zhang Paul J. Valdes Zhe-Kun Zhou 《国家科学评论:英文版》 CSCD 2019年第3期495-504,共10页
The uplift history of south-eastern Tibet is crucial to understanding processes driving the tectonic evolution of the Tibetan Plateau and surrounding areas.Underpinning existing palaeoaltimetric studies has been regio... The uplift history of south-eastern Tibet is crucial to understanding processes driving the tectonic evolution of the Tibetan Plateau and surrounding areas.Underpinning existing palaeoaltimetric studies has been regional mapping based in large part on biostratigraphy that assumes a Neogene modernization of the highly diverse,but threatened,Asian biota.Here,with new radiometric dating and newly collected plant-fossil archives,we quantify the surface height of part of the south-eastern margin of Tibet in the latest Eocene(~34 Ma)to be~3 km and rising,possibly attaining its present elevation(3.9 km)in the early Oligocene.We also find that the Eocene–Oligocene transition in south-eastern Tibet witnessed leaf-size diminution and a floral composition change from sub-tropical/warm temperate to cool temperate,likely reflective of both uplift and secular climate change,and that,by the latest Eocene,floral modernization on Tibet had already taken place,implying modernization was deeply rooted in the Palaeogene. 展开更多
关键词 BIODIVERSITY EOCENE OLIGOCENE plant FOSSIL Qinghai-Tibetan PLATEAU UPLIFT
河套盆地第四纪岩石地层区划及沉积序列
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作者 吴利杰 张翼龙 +4 位作者 石建省 李政红 王文中 王丽娟 于娟 《干旱区资源与环境》 CSSCI CSCD 北大核心 2019年第10期91-101,共11页
通过回顾河套盆地第四纪地层研究历史,针对该区收录的1100条钻孔资料进行了系统地编研,对河套盆地第四纪岩石地层进行了详细的地层区划、沉积序列厘定及邻区地层对比。研究认为:河套盆地第四纪岩石地层可划分为临河凹陷、西山咀隆起、... 通过回顾河套盆地第四纪地层研究历史,针对该区收录的1100条钻孔资料进行了系统地编研,对河套盆地第四纪岩石地层进行了详细的地层区划、沉积序列厘定及邻区地层对比。研究认为:河套盆地第四纪岩石地层可划分为临河凹陷、西山咀隆起、三湖河凹陷、包头隆起与呼和凹陷等5个地层分区,其沉积序列包括下更新统、中更新统上部、中更新统下部、上更新统及全新统等5个岩组。该地层划分方案具有区域岩石地层对比意义。中更新统上部湖相淤泥质粘性土层具有穿时性,其对区域地层划分对比与第四系含水层组划分有着重要的理论与实践意义。 展开更多
关键词 河套盆地 凹陷 隆起 更新统 全新统 地层划分对比
考虑支护位移和水压力的基坑底部隆起量估算改进方法 预览
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作者 曾晋 《水利科技与经济》 2018年第9期11-14,共4页
坑底隆起量的大小不但是判断基坑稳定和变形的重要依据,也是准确预估将来建筑物沉降量的前提。总结9种国内隆起量计算方法,并在规范法的基础上,考虑支护位移、水压力和自重应力抵消作用的影响,得到相应的改进方法。工程实例验算结... 坑底隆起量的大小不但是判断基坑稳定和变形的重要依据,也是准确预估将来建筑物沉降量的前提。总结9种国内隆起量计算方法,并在规范法的基础上,考虑支护位移、水压力和自重应力抵消作用的影响,得到相应的改进方法。工程实例验算结果表明,包括规范法在内的大部分公式的计算结果偏于不安全,但改进方法的计算结果更加符合实际工程,并且偏于安全。 展开更多
关键词 基坑工程 隆起 估算 支护位移 水压力
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缅甸中央盆地北部新生代隆升的裂变径迹证据
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作者 李任远 梅廉夫 +2 位作者 胡孝林 张朋 闵才政 《地球科学》 CSCD 北大核心 2018年第6期1931-1940,共10页
缅甸中央盆地北部新生代隆升作用的研究,不仅对全面认识西缅地块的演化具有重要的意义,而且对该地区的油气勘探也具有重要的指导意义.对采自研究区的2个碎屑岩样、1个钻井基底样品进行了磷灰石裂变径迹测年及热历史模拟分析.在弧前钦敦... 缅甸中央盆地北部新生代隆升作用的研究,不仅对全面认识西缅地块的演化具有重要的意义,而且对该地区的油气勘探也具有重要的指导意义.对采自研究区的2个碎屑岩样、1个钻井基底样品进行了磷灰石裂变径迹测年及热历史模拟分析.在弧前钦敦坳陷西缘冲断带、东缘冲起带和西缅岛弧带获得了逐渐变年轻的裂变径迹年龄(分别是70.6±9.3Ma、53.4±7.5Ma和22.7±3.0Ma),表明缅甸中央盆地北部在空间上存在自西向东的递进变形过程.磷灰石的热历史模拟分析显示,缅甸中央盆地北部自晚白垩世(80±1Ma)开始,经历了隆升→快速隆升→平稳→缓慢隆升4个阶段.缅甸中央盆地29~20Ma的快速隆升冷却事件是缅甸北部区域性隆升剥露作用的体现;4Ma以来缅甸中央盆地缓慢隆升,这一构造事件是印度板块向东挤压碰撞作用的响应.研究表明缅甸中央沉积盆地的空间发育演化与递进式构造变形(隆升)是新特提斯洋/印度洋岩石圈在新生代期间向西缅地块下的多期次俯冲的直接响应. 展开更多
关键词 缅甸中央盆地 新特提斯洋 新生代 磷灰石裂变径迹 隆升 石油地质
龙门山断裂带假玄武玻璃特征及断层弱化机制的探讨 预览 被引量:4
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作者 王焕 李海兵 +3 位作者 张蕾 孙知明 司家亮 裴军令 《地球物理学报》 CSCD 北大核心 2018年第5期1698-1714,共17页
与断层相关的假玄武玻璃被认为是地震化石,记录了地震发生过程和断裂机制的重要信息,对认识断层地震活动性具有重要意义.本文综合地表露头及汶川科钻(WFSD-1、WFSD-2)岩心研究,对映秀—北川断裂带南段彭灌杂岩中发育的假玄武玻璃进行... 与断层相关的假玄武玻璃被认为是地震化石,记录了地震发生过程和断裂机制的重要信息,对认识断层地震活动性具有重要意义.本文综合地表露头及汶川科钻(WFSD-1、WFSD-2)岩心研究,对映秀—北川断裂带南段彭灌杂岩中发育的假玄武玻璃进行详细的结构、构造及矿物成分分析.这些假玄武玻璃以断层脉和单个/网状贯入脉的形式产出,厚度由几毫米到数十厘米不等,与碎裂岩和超碎裂岩相伴生.显微结构观察发现假玄武玻璃中发育大量熔融特征构造,如港湾状熔蚀边、蜂窝状气孔构造、黏滞性流动构造以及针状、球粒状、羽状、纤维状、粒状等多种形态的微晶及微晶集合体,表明其为断层滑动摩擦熔融的产物,指示摩擦熔融润滑是断层滑动过程中最主要的弱化机制.同时热增压和机械润滑机制可能存在于断层滑动的不同阶段.此外,从野外和显微镜下都观察到假玄武玻璃脉具有浅灰、深灰、浅褐、棕褐色及黑色等不同的颜色,可能代表着不同程度的脱玻化作用,并且不同颜色有相互穿插交切关系,可能指示存在多期假玄武玻璃,也就是说,产生假玄武玻璃的大地震事件沿映秀—北川断裂带重复发生.最近的研究认为这些假玄武玻璃形成于晚三叠世时期地下~10—15km深度.结合须家河组地层中发育的厚层断层泥和角砾岩,~180—280m宽的映秀—北川断裂岩带是断裂长期活动演化的产物.作为龙门山地区最陡峭的地形边界,映秀—北川断裂带长期地震活动造成的地壳缩短加厚可能是龙门山快速隆升的主要原因. 展开更多
关键词 龙门山 假玄武玻璃 弱化机制 隆升 汶川科钻
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Mesh model building and migration and accumulation simulation of 3D hydrocarbon carrier system 预览
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作者 GUO Qiulin LIU Jifeng +6 位作者 CHEN Ningsheng WU Xiaozhi REN Hongjia WEI Yanzhao CHEN Gang GONG Deyu YUAN Xuanjun 《石油勘探与开发:英文版》 2018年第6期1009-1022,共14页
Migration and accumulation simulation of oil and gas in carrier systems has always been a difficult subject in the quantitative study of petroleum geology. In view of the fact that the traditional geological modeling ... Migration and accumulation simulation of oil and gas in carrier systems has always been a difficult subject in the quantitative study of petroleum geology. In view of the fact that the traditional geological modeling technology can not establish the interrelation of carriers in three dimensional space, we have proposed a hybrid-dimensional mesh modeling technology consisting of body(stratum), surfaces(faults and unconformities), lines and points, which provides an important research method for the description of geometry of sand bodies, faults and unconformities, the 3 D geological modeling of complex tectonic areas, and the simulation of hydrocarbon migration and accumulation. Furthermore, we have advanced a 3 D hydrocarbon migration pathway tracking method based on the hybrid-dimensional mesh of the carrier system. The application of this technology in western Luliang Uplift of Junggar Basin shows that the technology can effectively characterize the transport effect of fault planes, unconformities and sand bodies, indicate the hydrocarbon migration pathways, simulate the process of oil accumulation, reservoir adjustment and secondary reservoir formation, predict the hydrocarbon distribution. It is found through the simulation that the areas around the paleo-oil reservoir and covered by migration pathways are favorable sites for oil and gas distribution. 展开更多
关键词 oil and gas MIGRATION and accumulation CARRIER SYSTEM hybrid-dimensional MESH MIGRATION pathway geological modeling MESH generation JUNGGAR Basin western Luliang UPLIFT
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Fault characteristics and control on hydrocarbon accumulation of middle-shallow layers in the slope zone of Mahu sag, Junggar Basin, NW China 预览
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作者 CHEN Yongbo CHENG Xiaogan +3 位作者 ZHANG Han LI Chunyang MA Yongping WANG Guodong 《石油勘探与开发:英文版》 2018年第6期1050-1060,共11页
The development, evolution and formation mechanism of faults and their control on the migration and accumulation of Mesozoic oil and gas in the middle-shallow layers of the slope zone of Mahu sag were studied by the i... The development, evolution and formation mechanism of faults and their control on the migration and accumulation of Mesozoic oil and gas in the middle-shallow layers of the slope zone of Mahu sag were studied by the interpretation of seismic and drilling data. Two types of faults, normal and strike-slip, are developed in the middle-shallow layers of the slope zone of the Mahu sag and they are mostly active in the Yanshanian period. They are divided into four grade faults: The grade I strike-slip faults with NWW to near EW direction are related to the left-lateral transpressive fault zones in the northwest of Junggar Basin since the end of the Triassic. The grade II faults with NE to NNE direction are the normal faults located at the junction of the fault zone and the slope zone, and their formation is related to the extension at the top of the nose-like structures in the fault zone. The grade III faults, which are also the normal faults, are the result of the extension at the top of the lower uplifts in the slope zone and differential compaction. The grade IV faults with NE direction are normal faults, which may be related to the extension environment at the tip of the lower uplifts. Faults not only are the channel for the vertical migration of oil and gas, but also control the oil-gas accumulation. There are two types of oil-gas reservoirs in the middle-shallow layers of slope zone of Mahu sag: fault block reservoirs and fault-lithologic reservoirs. They have large traps and promising exploration potential. 展开更多
关键词 JUNGGAR Basin SLOPE ZONE of Mahu SAG middle-shallow layers fault genetic mechanism nose-like structure lower uplift hydrocarbon accumulation
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Mechanism and prevention method of drill string uplift during shut-in after overflow in an ultra-deep well 预览
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作者 YIN Hu SI Menghan +2 位作者 LI Qian JANG Hongwei DAI Liming 《石油勘探与开发:英文版》 2018年第6期1139-1145,共7页
Drill string will sustain large uplift force during the shut-in period after gas overflow in an ultra-deep well, and in serious case, it will run out of the wellhead. A calculation model of uplift force was establishe... Drill string will sustain large uplift force during the shut-in period after gas overflow in an ultra-deep well, and in serious case, it will run out of the wellhead. A calculation model of uplift force was established to analyze dynamic change characteristics of the uplift force of drill string during the shut-in period, and then a management procedure for the uplift risk during the shut-in period after gas overflow in the ultra-deep well was formed. Cross section method and pressure area method were used to analyze the force on drill string after shut-in of well, it was found that the source of uplift force was the 'fictitious force' caused by the hydrostatic pressure in the well. When the fictitious force is in the opposite direction to the gravity, it is the uplift force. By adopting the theory of annular multiphase flow, considering the effects of wellbore afterflow and gas slippage, the dynamic change of the pressure and fluid in the wellbore and the uplift force of drill string during the shut-in period were analyzed. The magnitude and direction of uplift force are related to the length of drill string in the wellbore and shut-in time, and there is the risk of uplift of drill string when the length of drill string in the wellbore is smaller than the critical drill string length or the shut in time exceeds the critical shut in time. A set of treatment method and process to prevent the uplift of drill string is advanced during the shut-in period after overflow in the ultra-deep well, which makes the risk management of the drill string uplift in the ultra-deep well more rigorous and scientific. 展开更多
关键词 ultra-deep well drilling OVERFLOW shut-in DRILL STRING UPLIFT force axial load
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贵阳地铁1号线雅关隧道道床板隆起原因分析及处治措施 预览
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作者 陈德国 《铁道建筑技术》 2018年第A01期173-177,共5页
道床板隆起会直接影响列车的运行安全,一旦发生应迅速处理.本文针对贵州轨道交通1号线雅关隧道道床板隆起情况,对现场进行了轨道高差量测和取芯分析,结合水文地质情况、现场施工情况对隆起原因进行了分析,并提出了相应的处理措施,包括... 道床板隆起会直接影响列车的运行安全,一旦发生应迅速处理.本文针对贵州轨道交通1号线雅关隧道道床板隆起情况,对现场进行了轨道高差量测和取芯分析,结合水文地质情况、现场施工情况对隆起原因进行了分析,并提出了相应的处理措施,包括拱脚泄水、仰拱和道床板注浆加固、道床板植筋等. 展开更多
关键词 道床板 隆起 原因分析 处治
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利用SBAS-InSAR研究汶川地震后鲜水河断裂西北段的形变特征 被引量:1
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作者 杨珍 张永志 +3 位作者 张文军 赵延岭 刘传金 叶凯 《兰州大学学报:自然科学版》 CSCD 北大核心 2018年第1期51-58,共8页
选取鲜水河断裂西北段2008年8月30日-2009年7月11日8景Envisat ASAR数据,基于SBAS-InSAR技术,获取了年平均形变速率图和7景时间序列图.结果表明:鲜水河断裂带附近视线向最大隆升值为27.0 mm/a,最大沉降值为23.0 mm/a,形变值主要集中在-... 选取鲜水河断裂西北段2008年8月30日-2009年7月11日8景Envisat ASAR数据,基于SBAS-InSAR技术,获取了年平均形变速率图和7景时间序列图.结果表明:鲜水河断裂带附近视线向最大隆升值为27.0 mm/a,最大沉降值为23.0 mm/a,形变值主要集中在-7.7-3.4 mm/a.主要的隆升区域位于道孚断裂的东北段,主要的沉降区域位于甘宁断裂的南段.鲜水河断裂西北段的形变量值很小,变化缓慢,每个地区月变化基本都在毫米范围内,断裂带隆升过程中可能出现沉降,沉降过程中也可能出现隆升,隆升和沉降说明在一段时间内断裂带总的运动趋势. 展开更多
关键词 合成孔径雷达干涉测量技术 年平均形变速率 隆升 沉降 鲜水河断裂
微型锚杆复合桩抗拔承载性能劣化演变的水力效应试验研究 预览
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作者 李玉润 黄雪峰 +2 位作者 奚增红 张广平 张沛然 《四川建筑科学研究》 2018年第2期89-93,共5页
为探究微型光伏支架抗拔基础(微型锚杆复合桩)在黄土地区的承载特性及受水力劣化的演变特征,在某黄土区光伏电站现场开展了不同桩基尺寸及试验条件的抗拔试验。试验结果表明:微型锚杆复合桩的整体抗拔受力工作状态较好,其承载力与桩长... 为探究微型光伏支架抗拔基础(微型锚杆复合桩)在黄土地区的承载特性及受水力劣化的演变特征,在某黄土区光伏电站现场开展了不同桩基尺寸及试验条件的抗拔试验。试验结果表明:微型锚杆复合桩的整体抗拔受力工作状态较好,其承载力与桩长及桩径有关,根据定义的桩基尺寸对极限承载力的贡献指标M计算比较后认为,桩长对承载力的提高水准更高;预浸水后微型锚杆复合桩的抗拔极限承载力减小,桩基承载性能出现不同程度弱化,桩长对于桩基极限承载力的提高水平同步发生劣化,但其贡献特征依然存在;水平预加载后微型锚杆复合桩的抗拔极限承载力下降,但与预浸水的变化(劣化)特征不同,微型锚杆复合桩桩长在水平加载耦合条件下对极限承载力的贡献指标增大,表明桩长增大对微型锚杆复合桩极限承载力受水平加载劣化的影响程度存在抑制作用。桩长的承载力贡献特征在水力劣化后依然存在,工程上可适度增加微型锚杆复合桩的桩长。 展开更多
关键词 微型锚杆复合桩 抗拔 承载力 浸水 预加载
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基于振动台的岸桥地震跳轨行为研究 被引量:1
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作者 李哲 王贡献 《武汉理工大学学报》 北大核心 2018年第1期43-47,共5页
有关岸桥轮轨接触式的边界约束在仿真分析中主要采用铰接模型和摩擦接触模型,为了得到更适合岸桥地震跳轨仿真分析的模型,结合岸桥地震灾害中脱轨现场与结构特点分析,进行仿真实验和振动台-相似模型地震试验,对比分析跳轨记录,确定采用... 有关岸桥轮轨接触式的边界约束在仿真分析中主要采用铰接模型和摩擦接触模型,为了得到更适合岸桥地震跳轨仿真分析的模型,结合岸桥地震灾害中脱轨现场与结构特点分析,进行仿真实验和振动台-相似模型地震试验,对比分析跳轨记录,确定采用摩擦接触模型可以准确模拟岸桥轮轨边界约束。 展开更多
关键词 集装箱起重机 地震载荷 振动台 相似模型 跳轨
盾构区间孤石爆破工艺研究 预览
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作者 郭良法 《河北建筑工程学院学报》 CAS 2018年第1期34-39,共6页
盾构施工如遇到地层中存在大量孤石和隆起岩石,将给盾构施工造成极大的困扰.本文通过对孤石和隆起岩石爆破工艺研究,采用多段毫秒延时起爆工艺,并给出钻孔、爆破参数、装药量等对类似工程有借鉴意义.
关键词 孤石 隆起 多段毫秒延时起爆 单孔单响 小规模爆破
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