广州软土的压缩特性与修正剑桥模型参数λ和κ  

Compression Characteristics and Modified Cam-clay Model Parameter λ and κ of Guangzhou Soft Soils

作　　者：刘律智 杨涛[1] 马鹏真[1] 

机构地区：[1]上海理工大学土木工程系,上海200093

出　　处：《水利与建筑工程学报》2016年第1期45-48,共4页Journal of Water Resources and Architectural Engineering

基　　金：广东省交通科技项目(201102021)

摘　　要：修正剑桥模型是基于临界状态土力学理论建立的土弹塑性本构模型,在世界上得到广泛应用。为获得修正剑桥模型参数λ和κ,需要对土进行等向压缩试验。然而,实际工程的土工试验报告通常仅提供一维压缩试验得到的压缩指数Cc和回弹指数Cs,并不进行等向压缩试验。对广州原状软土进行了一维压缩试验和等向压缩试验,试验结果表明,单向压缩试验与等向压缩试验下广州软土的压缩指数近乎相同,而等向压缩试验下广州软土的回弹指数为单向压缩试验下回弹指数的1.49~1.87倍;Cc与其修正剑桥模型参数λ比值为1.88~2.38,Cs与其修正剑桥模型参数κ比值为1.2~1.54。试验成果可为广州地区的工程设计、软土本构模型的建立提供参考数据。Based on the critical state soil mechanics theory,the modified cam-clay model has been developed and widely used all over the world. Isotropic compression tests are essential for the measurement of modified cam-clay model parameters,such as λ and κ. The usual parameters reported in most of the soil investigation reports are the odometer test parameters,such as compression index Ccand the swelling index Cs. However,isotropic compression tests are usually not conducted. A series of odometer tests and isotropic compression tests were carried out on the undisturbed samples from Guangzhou soft soils. The results show that the values of the compression indexes of Guangzhou soft soils under the two different compression tests are almost the same. The values of the swelling indexes of the soils under the isotropic compression test are 1. 49 ~ 1. 87 times higher than those under the odometer test. The ratios Cc/ λ and Cs/ κ of the soils vary from 1. 88 to 2. 38 and from 1. 2 to 1. 54 respectively. These test results are valuable to the engineering design of Guangzhou area and the development of constitutive model for Guangzhou soft soils.

关 键 词：修正剑桥模型 等向压缩试验 一维压缩试验 压缩指数 回弹指数 

分 类 号：TU447[建筑科学—岩土工程]