硬粘土的动力特性及地震反应

Dynamic Properties and Earthquake Response of Hardpan

本文结合地震小区划的需要对皖西硬粘土的动力特性进行了一些研究。通过电镜扫描分析了微观结构对硬粘土力学性质的影响。从现场单孔检层法测定的剪切波速及室内动三轴试验结果,得出硬粘上的应力应变关系符合双曲线模式,其形态与土样裂隙分布状态有关。应用lwan模型计算场地土层的动力反应,分析了地面反应谱与场地上层条件的关系。最后,根据反应的结果提出不同类型场地的各设防水准的地震影响系数。

For the need of earthquake microzonation some studies on the dynamic properties of hardpan in west Anhui were conducted. The microstructure of hardpan is described through observation of electronic microscope and its effect on the mechanical properties is analyzed. From the shear wave velocity by boring and dynamics triaxial test the relation of shear stress-strain confirms to hyperbola, and the shape of hyperbola depends on the state of fissures distributing in hardpan. Earthquake dynamic response of stratum was calculated by lwan model and relation of site response spectrum to the stratum condition was analyzed. Finally, earthquake force based on maximum site acceleration and response spectrum to different design criterion for different type of site was determined.