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工程活动诱发的围岩结构变化对隧道突涌水的影响分析 被引量:1

Influences of structural variation of host rock induced by engineering activities on water inrush of tunnels
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摘要 随着深大交通、水利水电隧道(洞)的大量建设及地下矿产的不断延深开采,隧道突水灾害问题愈加严重。工程活动作为诱发突水的必要条件,其导致的围岩结构变化将对围岩力学、水力学性质及隧道附近渗流场产生重要影响。从工程扰动诱发的围岩损伤及其导致的渗透性演化入手,利用理论解析法研究了隧道围岩结构变化对涌水量及水压力分布的影响。结果表明:损伤区厚度对隧道涌水量和孔隙水压力分布具有较大影响,损伤区范围越大,发生突水的危险性越大;损伤区渗透系数对隧道涌水量的影响阈值约为2个数量级,之后其对涌水量的影响较弱;注浆圈厚度越大、渗透系数越低,隧道涌水量越小,但并不是注浆圈厚度越大、渗透性越低,涌水量的控制效果就越好,而是存在一个最优效果的设计值。 Water inrush disasters have become a serious problem resulting from the current trend that numerous traffic roads and hydropower tunnels are constructed, and minerals are mined in deep underground. The variation of rock structures induced by engineering activities has great influences on the mechanical and hydraulic properties of the host rock, and the seepage fields around tunnels. The theoretical analysis method is employed to investigate the influences of the structure variation of rock on the groundwater inflow rate and pore water distribution based on the damage and permeability evolutions of host rock induced by engineering disturbance. The results show that the influences of the thickness of the damage zone on the pore water distribution and the groundwater inflow rate are significant. The risk of water inrush increases with the increase of the thickness of the damage zone. The influences of the hydraulic conductivity on the pore water distribution and the groundwater inflow rate are weak if more than two orders of magnitude increase in hydraulic conductivity of damaged zone. The inflow rate decreases with the increase of the thickness of grouting circle and the decrease of its hydraulic conductivity. However, there is a best design value for the thickness and permeability of the grouting circle, rather than the effect of greater thickness and lower permeability of the grouting circle.
作者 黄震 朱术云 赵奎 李晓昭 吴锐 王迎超 王晓军 HUANG Zhen1, 2, 3 ZHU Shu-yun4, ZHAO Kui1, LI Xiao-zhao3, WU Rui1, WANG Ying-chao5, WANG Xiao-jun1 (1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; 2. State Key Laboratory for Geomechanics & Deep Underground Engineering, Xuzhou 221116, China; 3. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China; 4. School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221116, China; 5. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China)
出处 《岩土工程学报》 CSCD 北大核心 2018年第3期449-458,共10页 Chinese Journal of Geotechnical Engineering
基金 国家重点基础研究发展计划(“973”计划)(2013CB036001) 国家自然科学基金项目(4170236,41572263) 博士后创新人才支持计划(BX201700113) 中国博士后科学基金项目(2017M620205) 中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1703) 江西理工大学博士启动基金项目(jxxjbs17005)
关键词 地下工程 隧道突水 开挖损伤 岩体结构 渗透系数 涌水量 underground engineering water inrush of tunnel excavation damage rock structure hydraulic conductivity inflow rate
作者简介 黄震(1989-),男,江西大余人,博士,讲师,主要从事工程地质和岩土工程方面的教学与研究工作。E-mail:huangzhen075@163.com。;通讯作者(yglmf_zk@163.com)
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