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某深大基坑透水事故分析及处理 预览 被引量:2

Analysis and Dispose of Water Inrush Accident of a Deep Foundation Pit
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摘要 某软土地区深大基坑,地质特点是流砂+岩溶,即奥陶纪灰岩溶蚀面上直接覆盖饱水粉细砂的隐伏岩溶区,基坑采用多种墙体形式(排桩、地连墙)+内支撑结合坑外三轴搅拌桩止水帷幕的支护形式。开挖施工过程中,出现了基坑坑底涌砂、坑外路面坍塌的事故。根据场地地质情况、周边环境、基坑支护及开挖施工的情况,结合基坑监测数据和地质雷达扫描探测结果,对事故的原因进行了分析,并通过坑内反压虑砂、坑外压密注浆的方法成功进行了抢险处理。最后给出了同类工程在勘察、施工方面的建议。 A deep foundation pit in a soft soil region was discussed in this article. Its geological features include the sand flow and karst,which is actually the hidden karst region formed by covering the Ordovician limestone erosion surface directly with the fine sand. This foundation pit has adopted a variety of pit wall for the supporting method,such as row of piles and diaphragm wall,as well as the inner support combined with the three- axis mixing pile anti-water curtain. During the excavation process,an accident happened in the form of sand boiling in the pit bottom and also the ground collapse outside. According to the site geological conditions,surrounding environment,supporting structure and construction situation,combined with the geological data of excavation monitoring and scan result from the detection radar,this paper first analyzed the reasons of the accident,then proposed a method to relieve the danger by the method of anti-pressure with filter sand in the pit and external pressure grouting outside. Finally,this paper provide some recommendations to similar projects about survey and construction.
作者 陈国庆 潘仪凯 肖亮 CHEN Guoqing, PAN Yikai, XIAO Liang ( Zhenjiang Quality Supen,ision Station of Construction Engineering, Zhenjiang, Jiangsu 212000, China)
出处 《水利与建筑工程学报》 2016年第5期229-234,共6页 Journal of Water Resources Architectural Engineering
关键词 深大基坑 渗漏 坍塌 反压堵漏 基坑监测 地质雷达 deep foundation pit leaks collapse leaking stoppage under pressure deep pit monitoring GPR
作者简介 陈国庆(1986-),男,江苏仪征人,硕士,工程师,主要从事建设工程质量管理工作。E-mail:564958650@qq.com
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