基于Ps值的软土抗剪强度指标选取研究——以武汉长江Ⅰ级阶地为例

对武汉长江Ⅰ级阶地多个典型基坑工程软土进行静力触探试验以及各种试验条件下的抗剪强度试验，通过500多组试验数据分析了Ps值与抗剪强度指标之间的相关性，得到了回归拟合曲线方程。结果表明，武汉长江Ⅰ级阶地软土抗剪强度指标与Ps值具有较好的相关性。利用Ps值根据拟合曲线方程计算各种试验条件下的抗剪强度指标，同时使用有限元方法建立深基坑三维数值分析模型，通过支护桩水平位移模拟值与实测值的对比分析，得出使用三轴固结不排水抗剪强度指标更符合实测结果。所建立的回归拟合曲线方程为武汉长江Ⅰ级阶地软土抗剪强度指标的获取提供了一个简单易行的方法。

Research on shear strength index selection of soft soil according to Ps Value

A static cone penetration test and a shear strength test of soft soil at some typical foundation pits in Wuhan Yangtze River level-I terrace are carried out to analyze relevance between Ps value and shear strength index through more than 500 groups of test data, which led to the regression fitting curve equation. The result shows: there exists good correlation between Ps value and shear strength index of soft soil in Wuhan Yangtze River level-I terrace. The shear strength index under different test conditions by Ps value is calculated according to the regression fitting curve equation. Based on finite element method, a 3D numerical analytic model for deep foundation pit is established, through which the simulation values and the measured values of horizontal displacement of the supporting pile are compared and analyzed. It is concluded that three axis consolidation un-drained shear strength index is more in line with the actual measured results. The regression fitting curve equation can provide a simple and easy method for obtaining shear strength index of soft soil in Wuhan Yangtze River level-I terrace.