原状和重塑海洋粘土经历动载后的静强度衰减  

The degradation of undrained shear strength of undisturbed and remolded marine clay after cyclic loading

作　　者：王淑云[1] 楼志刚[1] 

机构地区：[1]中国科学院力学所,北京100080

出　　处：《岩土力学》2000年第1期20-23,27,共5页Rock and Soil Mechanics

基　　金："九五"中科院资源与生态环境研究重大项目资助! (KZ951 A1 4 0 5)

摘　　要：根据海洋粉质粘土原状和重塑土样的动三轴试验结果 ,比较和分析了两种土样应力、应变、孔隙水压力和不排水抗剪强度行为 ,得到了土样的静不排水抗剪强度衰减与波浪荷载作用下土样产生的动应变以及平均累积孔压之间的关系。并将波浪荷载作用使土样内孔压升高 ,有效应力降低 ,形成拟超固结现象的理论 ,应用到土样不排水抗剪强度衰减与平均累积孔压之间关系的分析 ;同时与重塑土样的超固结静态剪切试验结果进行比较 ,得到了土样在波浪荷载作用后的归一化不排水抗剪强度与拟超固结比之间的关系式。建议以少量原状土样 ,配合大量重塑土样的动三轴试验结果 。The behavior of stress, strain, pore pressure and static undrained shear strength of undisturbed or remolded marine silty clay samples under undrained cyclic loading conditions is analyzed. The degradation of undrained shear strength is related to the cyclic strain and accumulated pore pressure produced by undrained clyclic loading. Based on the principle of quasi overconsolidation and the results of comparing the cyclic triaxial test on normal consolidated samples and the static triaxial test on overconsolidated samples, the relation between normalized undrained shear strength and quasi overconsolidation ratio is estabalished. In order to estimate the degradation of undrained shear strength of marine sily clay, the cyclic triaxial test results of undisturbed and remolded marine silty clay samples are needed.

关 键 词：强度衰减 波浪荷载 粘土 海洋粘土 土力学 

分 类 号：TU43[建筑科学—岩土工程] TU442[建筑科学—土工工程]