中文摘要：

现有基坑支护设计参数试验条件与实际不符。选取天津滨海新区海相软土为研究对象，进行三轴固结不排水试验、三轴不固结不排水试验和减P路径试验并对比分析了几种试验条件下土的强度参数。得到：滨海软土在不同应力路径下的强度与初期固结方式有关。减P路径对总应力状态下抗剪强度有影响，但对有效应力状态下抗剪强度基本无影响。在滨海软土基坑支护设计中，选用cu试验参数进行计算，设计偏于安全。

英文摘要：

for the study of marine soft clay in Tianjin Binhai New Area, consolidated undrained triaxial compression test, unconsolidated undrained triaxial compression test and decrease pressure path test are carried out in order to compare with the shear strength properties in different methods. According to the experimental result, behaviors of soft soil under different stress path are related to initial consolidation states. DEP test affects the total shear strength properties but has little influence on effective shear strength parameters. It is safe to use the soil shear strength properties of CU test in the design of foundation pit bracing of Binhai New Area.