This test is based on homogeneous soil in foundation , and divided into two phases . the first is to stimulate the construction flow to excavate the pit ; the second phase is destructive test . because the pit is stable in the first phase and the research is point to the geometry shape of the failure surface , moreover , limited to the test condition , the effective surface force is applied to the pit 此次模拟试验主要是针对简单均质的基坑土层进行研究，试验分为两个阶段，第一阶段主要是以相似工况模拟基坑开挖，第二阶段主要是破坏性试验，即由于在第一阶段基坑在开挖范围内能够自稳，为使基坑达到破坏状态以研究滑面几何形态，限于试验条件，采用“等代面力”的方式施加超载。
In order to effectively determine the position and distribution of porosities in laser welding sampes with complex structure , a preliminary research was proceeded on the distribtion features of porosities and a formula which can calculate the buried depth of porosities was deduced based on the line profile distribution curve of the flaw position 为了确定复杂结构激光焊件焊缝中气孔缺陷的位置和分布，对气孔缺陷的分布特征进行了研究，推导出气孔缺陷埋藏深度的计算公式，设计了峰值异常缺陷和斜凹型异常缺陷投影距离自动提取算法，确定了缺陷在钛合金激光焊件中的分布特征，并通过模拟试件的破坏性试验对该公式进行了验证。
