堤基截渗垂直铺塑回填土对槽壁稳定性影响分析  

Analysis of Impact from Dike Foundation Seepage Cutoff Vertical Plastic Film Laying Backfill on Groove Wall Stability

作　　者：孙树林[1] 胡昭 吴正松[2] 张德恒[3] 孙建东 Sun Shulin;Hu Zhao;Wu Zhengsong;Zhang Deheng;Sun Jiandong(School of Earth Sciences and Engineering, Hohai University, Nanjing, Jiangsu 211100;The Yi-Shu-Si River Basin Administration, Xuzhou, Jiangsu 221009;Department of Architecture Civil Engineering, Nanjing Institute of Technology, Nanjing, Jiangsu 211167)

机构地区：[1]河海大学地球科学与工程学院,南京211100 [2]沂沭泗水利管理局,江苏徐州221009 [3]南京工程学院建筑学院,南京211167

出　　处：《中国煤炭地质》2019年第8期60-64,68,共6页Coal Geology of China

基　　金：中央高校科研业务费专项资金资助(2109B42214)

摘　　要：垂直铺塑技术是堤基截渗的一种有效手段,沟槽回填是保证截渗效果的必要措施。施工中,因回填土的膨胀性而导致槽壁变形破坏,甚至铺塑失败。针对回填土膨胀性对沟槽稳定性的影响问题。在分析了槽壁失稳机理基础上,通过对槽壁的受力分析,研究了回填土前后槽壁的土压力变化特征,分析了回填土的膨胀性导致槽壁变形破坏条件,获得了回填土回填时的最优含水率区间。所得结论与工程实际基本一致,为铺塑技术施工提供了借鉴和经验。The vertical plastic film laying technology is an effective means in the dike foundation seepage cutoff, while the groove backfilling is a necessary measure to ensure seepage cutoff effect. In operation, because of backfill expansibility can cause groove wall deformation and failure, even plastic film laying failed. In allusion to the issue of impact from backfill expansibility on groove stability, on the basis of groove wall instability mechanism analysis, through groove wall force analysis has studied front and rear groove walls backfill pressure variation features. After analyzed backfill expansibility caused groove wall failure conditions have acquired backfilling optimal moisture content interval. The conclusion obtained is basically consistent with engineering practices, and provided reference and experience for plastic film laying operation.

关 键 词：垂直铺塑 槽壁失稳 受力分析 沟槽回填 

分 类 号：TU441.35[建筑科学—岩土工程]