砂卵石基坑施工降水及渗流安全评价  

Construction dewatering and seepage safety evaluation of sandy gravel foundation pit

作　　者：谷海青 杨楠[2] 史长莹[2] 

机构地区：[1]河北省南水北调工程建设管理局,石家庄050035 [2]黑龙江大学水利电力学院,哈尔滨150080

出　　处：《黑龙江大学工程学报》2015年第3期32-34,共3页Journal of Engineering of Heilongjiang University

基　　金：河北省南水北调工程科技项目

摘　　要：工程降水是确保基坑施工安全,防止基坑开挖时由于压差作用产生渗流现象出现流砂、基底涌砂隆起的有效措施之一。以南水北调中线SG6标段基坑降水为例,依据所进行的换填土室内击实实验、野外碾压实验等所得到的实验数据,建立渗流模型,分别在Vensim PLE环境和MATLAB环境下进行模拟。研究了不同工况渗透流量随时间变化的过程,得出了对工程实践具有指导意义的结论,有限时间内的施工降水不会导致大量地下水损失,所产生的影响对距离渠道1 500m以外的地区可以小到忽略不计的程度,供施工单位和工程评价参考。The construction dewatering is one of the effective measures to prevent the harm caused by seepage flow phenomenon when foundation pit is excavated, the seepage phenomenon is generated by the differential pressure to ensure the safety of foundation pit＇s construction. In this dissertation, SG6 bid section middle route＇s excavation dewatering in the South-to-North Water Diversion Project is taken for example, establish the seepage flow model and simulate in the environment of Vensim PLE and MATLAB respectively. According to the experimental data obtained by an indoor compaction test and a field rolling test of replacing and filling earth. The seepage flow changes over time with different H is developed by studying the process in order to get some conclusions which has big significance for engineering practice. The water pumping has limited effected in ground loss in construction period. The loss of underground water is negligible at the area outside 1 500 m of the channel, which is useful for further study and engineering evaluation.

关 键 词：砂卵石基坑 工程降水 渗流 仿真模拟 

分 类 号：TV551.41[水利工程—水利水电工程]