再论粗粒土剪胀性模型  

Further Discussion on Dilatancy Model for Coarse-Grained Soils

作　　者：程展林[1] 陈鸥[1,2] 左永振[1] 丁红顺[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]河海大学水利水电工程学院,南京210098

出　　处：《长江科学院院报》2011年第6期39-44,49,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50639050)

摘　　要：介绍了2种堆石料大型三轴试验和平面应变试验的试验成果。假设土的应变分为弹性应变和剪胀应变,弹性应变与应力间服从广义虎克定律,剪胀应变服从Rowe剪胀方程,弹性泊松比为常数,完整地建立3参量Kp,Kq,G与应力关系式,初步提出了一种新的非线性剪胀模型,给出了模型参数的整理方法,论证了一般非线性弹性模型中泊松比的力学意义。试验表明,剪胀性模型能够很好地模拟堆石料的应力应变曲线,对于同一种堆石料,由三轴试验和平面应变试验得到的模型参数除强度指标外,其它参数有很好的一致性,并给出了2种堆石料的模型参数。该模型是一种力学概念明确,简单实用的非线性剪胀模型。The test results of large triaxial test and plane strain test for two kinds of coarse-grained soils are firstly described.Soil strain is assumed as two parts composed of elastic strain and dilatancy strain.The relationship of elastic strain and stress is supposed to obey generalized Hooke＇s law;while the dilatancy strain obeys Rowe dilatancy law,and the elastic Poisson＇s ratio is assumed as constant.Based on these assumptions,the relationship between stress and three parameters including volumetric strain module Kp,dilatant module Kq,and shear module G is established,and a new nonlinear dilatancy model which is simple and practical with clear physical concept is preliminarily proposed.Subsequently,the collation method of the model parameters is given,and finally the mechanical significance of Poisson＇s ratio of the general nonlinear elastic model is demonstrated.The tests indicate that the model can well simulate the stress-strain curve for different coarse-grained materials.As for the same coarse-grained soils,the model parameters from the triaxial test and plane strain test are consistent except for the strength index.Model parameters for two kinds of coarse-grained soils are also offered.

关 键 词：应力应变关系 本构模型 平面应变试验 剪胀性 粗粒土 土石坝 

分 类 号：TU432[建筑科学—岩土工程]