地下水对基坑开挖的影响以及防治措施的研究

基于地下水的不同类别及其特性，分析了包气带水、潜水以及承压水的影响及其预防措施。分析表明，对于包气带水和潜水其影响主要是引起基坑渗流，通过打隔水桩截断之即可收到很好的效果；对于承压水其影响主要是引起基坑突涌，分析了传统降水法（明沟排水、深井排水等）的效果及其存在的弊端。在新方法的研究中，基于球形颗粒理想化最松散堆积模型，研究了弹性条件下饱和土的力学特性。研究表明，基坑的破坏主要有两种方式，弯矩破坏和剪力破坏。利用材料力学原理分别计算出其最小隔水厚度hmin^s、hmin^w，理论分析表明，只要通过增设压板改变最大弯矩的值可以使hmin^s、hmin^w降到hmin。

Impactions of Groundwater on Excavation and Preventive Measures

Based on different types of groundwater and its characteristics, the impaction of of vadose zone water, diving water as well as confined water and their preventive measures are analyzed. The results show that the vadose zone water and diving water＇s impaction is mainly caused by seepaging Through the cut-off pile,good results can be received; and the confined water is mainly caused by the irnpaction of sudden foundation chung. The traditional preventive method （river drainage, deep well water and so on） and their disadvantages are analyzed. In the study of new ways, we studied the Mechanical properties of unsaturated soils under the condition of flexibility based on spherical particles loose accumulation of the most idealized model show that there are two main damage modes, bending and shear damage. The materials mechanicsare applicated to calculate separately the minimum riser h and h~., through theoretical analysision we know that, as long as change the value of maximum bending moment the thickness could be reduce to the minimum by adopting additional plates.