滨海新区浅层软土卸荷变形性状试验研究

Experimental studies on unloading deformation properties of soft clay in Binhai New Area

摘要: 天津市滨海新区的城市开发建设正步入高速发展阶段,出现了大量的深基坑工程等地下工程,工程建设的需要使得针对滨海软土各种性状尤其是卸荷性状的研究成为必然。通过对天津市滨海新区浅层淤泥质粘土原状饱和试样进行的一系列ko固结不排水三轴卸荷试验,研究土体卸荷路径下的变形特性。试验表明,滨海新区浅层土体的变形性状与应力路径密切相关。在侧向及竖向卸荷条件下土样的应力-应变曲线均可用双曲线函数模拟,且土体初始卸荷模量随固结围压的增加而增加;侧向与轴向卸荷条件下,滨海新区浅层软土均有着比较明显的归一化性状,其应力-应变关系随着固结围压线性变化。

Abstract: With high speed development of the city construction in Tianjin Binhai New Area,a great deal of underground engineering such as deep foundation excavations came forth.This made the research on the properties of soft clay in Binhai New Area become necessary,especially for the unloading properties.Using the improved triaxial equipment,a series of ko consolidation and undrained tests have been carried out to study the unloading deformation properties of the soil in Tianjin Binhai New Area.According...