不同固结路径温州黏土固有不排水强度性状试验研究

为研究初始条件和应力状态对重塑黏土固有不排水强度性状的影响,采用应力路径三轴仪对室内制备的温州黏土进行一系列不同固结路径下的三轴固结不排水剪切试验。通过室内试验研究探讨温州黏土不同固结路径下不同平均有效应力固结后三轴不排水剪切应力应变关系和不排水强度特性;引入不同平均有效应力p’下的孔隙指数I_v与不排水强度比R^*_su=S_u/ p’,分析不同固结路径下不排水强度S_u的变化规律,并与Chandler提出的固有强度线IS_uL进行比较分析。结果表明：相同平均有效应力p’下,不同固结路径下不排水剪切强度S_u和不排水强度比R^*_su=S_u/ p’随固结路径的变化而变化;当不排水强度比S_u/ p’=0.33时,孔隙指数I_v与固结不排水强度S_u之间的关系与Chandler的固有强度线IS_uL一致。

Undrained shear behaviors of reconstituted Wenzhou clay under different consolidation stress paths

To investigate the effects of the initial conditions and stress states on the intrinsic undrained strength behaviors of reconstituted clay, a series of consolidated undrained triaxial compression tests are performed on reconstituted Wenzhou clay under different consolidation conditions. The undrained shear stress-strain relationship and undrained strength are investigated. The void index I_v and the undrained strength ratios R^*_su=S_u/ p’ with different mean effective stresses p’ are used to compare the undrained strength S_u under different consolidation conditions with the Chandler intrinsic strength line IS_uL. The results indicate that the undrained shear stress-strain curves change with the consolidation stress paths under the same mean effective stresses p’. The undrained shear strengths and undrained strength ratios R^*_su=S_u/ p’ are also greatly affected by the consolidation stress paths. When S_u/ p’=0.33, the relationship between the void index I_v and the undrained strength S_u is identical to the Chandler intrinsic strength line IS_uL.