摘要
对高原水库松散坝基的渗漏问题调查研究,开展松散坝基土体天然及击实情况下渗透-淤堵试验研究,得出添加淤堵材料可有效提高水力梯度,降低土体的渗透系数。结合渗透-淤堵试验结果,建立高原水库松散坝基防渗模拟方案,对无防渗、长度分别为70 m、140 m、175 m、210 m的水平铺盖、淤堵、击实及击实淤堵八种方案的渗漏量、坝基等势线分布、坝基水头值、流速值等分析,得出水平铺盖虽可减少坝基渗漏量,但投资较高;淤堵可减缓坝基的渗漏现象,但不能根本解决坝基渗漏问题,击实淤堵可将防渗效果和减小投资兼具,推荐击实淤堵为最优防渗方案。以上试验及模拟工作可为该类松散坝基防渗减渗工作提供依据。
Under leakage of loose dam foundation in plateau,the infiltration clogging tests of natural soils and compaction degree soils were carried out.When adding clogging materials,the hydraulic gradients slowly increased and permeability coefficient of specimens gradually decreased with time step for both natural soil and compacted soil.Building prestressed anchor cable of loose dam foundation combining with infiltration clogging tests,the results of leakage,foundation total head,foundation head value and velocity of flow were analyzed in different plans of no seepage,linen level in 70 m,140 m,175 m,210 m,clogging and compaction clogging.The results show that although the linen level can reduce the amount of leakage,but higher investment,clogging can slow foundation of leakage,but can not fundamentally solve the problem of foundation seepage,compaction clogging can get the above two advantages,the compaction clogging prestressed anchor cable was recommended.The laboratory tests and numerical simulation results can provide a basis for the work of infiltration prevention and reduction on loose dam foundation.
作者
马建全
李识博
MA Jian-quan;LI Shi-bo(College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《科学技术与工程》
北大核心
2018年第10期136-143,共8页
Science Technology and Engineering
基金
国家自然科学基金(41602359)
陕西省自然科学基础研究计划(S2017-ZRJJ-QN-1470)
陕西省教育厅专项科研计划(14JK1464)资助
关键词
松散坝基
渗透淤堵
防渗方案
数值模拟
loose dam foundation
infiltration clogging
seepage control scheme
numerical simulation
作者简介
第一作者:马建全(1983—),男,回族,新疆焉耆人,博士,讲师。研究方向:工程地质及岩土工程。E-mail:.mjq240301@163.com。;通信作者:李识博,女,博士,讲师。研究方向:工程地质及地质灾害防治工程。E-mail:kukumahu@126.com。
