侧向卸荷路径下天津滨海软土强度参数试验研究

针对侧向卸荷条件下软土变形、强度等典型力学特性,选取天津滨海新区9～18,m深度海相软土为研究对象,采用应力-应变控制式三轴剪切渗透试验仪,对试样进行了三轴不固结不排水试验(UU)、三轴固结不排水试验(CU)以及K0固结轴向卸荷试验(DEP).试验结果表明:UU、CU、DEP试验应力与应变关系曲线呈双曲线特性,UU与CU试验应力与应变关系曲线呈硬化特征,DEP试验应力与应变关系曲线呈软化特征.DEP试验对于总应力强度参数有影响,对有效应力强度参数影响较小.

Experimental Studies of Mechanical Parameters of Soft Clay under Lateral Unloading Stress Path in Tianjin Binhai New Area

For studying the typical mechanical properties such as deformation and strength of soft soil under the lateral unloading conditions, the authors selected the marine soft clay of 9-18 m depth in Binhai New Area as researching objects. The triaxial consolidated undrained test （CU）, triaxial unconsolidated undrained test （UU） and K0 consolidation axial unloading test （DEP） were carried out on the stress-strain controlled triaxial shear penetration tester. The results showed that the strain-stress curves of CU, UU and DEP tests presented hyperbolic characteristics, the strain-stress curves of CU and UU presented hardening characteristics, the sWain-stress curves of DEP test presented softening characteristics. The DEP test has impact on total stress strength parameters, but less impact on the effective stress strength parameters.