饱和黏性土最大动剪切模量的室内和原位试验对比研究  

Lab and in-situ tests on maximum dynamic shear modulus of saturated clay soils

作　　者：高志兵[1,2,3] 高玉峰[1,2] 谭慧明[3] 

机构地区：[1]岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]江苏省地震工程研究院,江苏南京210014

出　　处：《岩土工程学报》2010年第5期731-735,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50639010;908151020)

摘　　要：对463组饱和黏性土原状土样室内试验的最大动剪切模量和同一位置现场原位试验确定的最大动剪切模量进行了对比研究。结果表明:原状土样室内试验和同一位置的现场原位试验所确定的动剪切模量相差很大,室内试验结果基本上小于现场试验结果,埋藏深的土样相差更大;室内试验的最大动剪切模量与深度符合指数规律,并得到了室内试验最大动剪切模量与现场剪切波速的统计经验关系式。通过工程实例比较了两种试验最大动剪切模量对地震反应分析的影响,室内试验最大动剪切模量与现场剪切波速的关系统计式在工程场地地震反应分析中具有一定的参考应用价值。Considering the importance of the maximum dynamic shear modulus of saturated clay soils in calculation,lab and in-situ tests are performed.According to the 463 tests finished in the past several years,the values of the dynamic shear modulus of the same soil are different in the lab and in-situ tests.The results obtained from the lab tests are mostly less than those from the in-situ tests,and the differences become greater with the increase of depth.Based on the relationships of the maximum dynamic shear modulus in lab tests with the depth,which follows the exponential function,the statistical formula of the maximum dynamic shear modulus in lab tests and the shear wave velocity in in-situ tests are obtained.Finally,the maximum shear modulus Gmax derived from the above formula is applied in the case of ground seismic response computation,in which Gmax obtained from the in-situ tests is also used.The results show that the statistical formula is reasonable and practicable,and the differences of the maximum shear moduli obtained in different ways will have great effects on the peak ground acceleration and the characteristic period of the seismic response spectra.

关 键 词：最大动剪切模量 剪切波速 地震反应分析 

分 类 号：TU435[建筑科学—岩土工程]