有效应力决定饱和岩土材料抗剪强度的摩擦学解释  

Tribological explanation of effective stress controlling shear strength of saturated geomaterials

作　　者：雷国辉[1] 陈晶晶[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室/岩土工程科学研究所,江苏南京210098 [2]铁道第三勘察设计院集团有限公司地质路基设计处,天津300251

出　　处：《岩土工程学报》2011年第10期1517-1525,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50878075);江苏省高校青蓝工程基金项目;中央高校基本科研业务费专项资金项目(2011B02814)

摘　　要：有效应力决定了岩土材料的变形和强度,有效应力概念虽然已在岩土工程中广泛应用,但是,对于决定饱和岩土材料抗剪强度的有效应力,其理论解释至今却并不充分且受到质疑。为此,通过文献分析,确定了宏观抗剪强度与粒间摩擦强度之间的正相关关系,并运用摩擦学中的黏着摩擦理论,推导了排水和不排水条件下,粒间接触面黏着结点的生长公式和抗剪强度公式。通过对比分析这两种条件下的应力状态对抗剪强度的作用影响,得到了与Terzaghi一致的有效应力表达式,并在此基础上,探讨了有效应力和有效应力原理的基本概念和定义。It is the effective stress that controls the deformation and strength of geomaterials.The principle of effective stress has been utilized extensively in geotechnical engineering.However,theoretical explanation for the effective stress controlling the shear strength of geomaterials is so far by no means sufficient and is doubted.In order to improve this situation,a comprehensive literature review is carried out.This results in a finding of a positive correlation between macroscopic shear strength and interparticle friction strength.The adhesion theory of friction in tribology is adopted to derive the formulae of the junction growth of an interparticle contact and the shear strength under both drained and undrained conditions.Through a comparative study of the influences of the stress states under both conditions on the shear strength,an effective stress expression in consistent with Terzaghi＇s expression is achieved.On this basis,the concept and the definition for both the effective stress and the principle of effective stress are discussed.

关 键 词：有效应力 有效应力原理 抗剪强度 摩擦学 黏着摩擦理论 

分 类 号：TU431[建筑科学—岩土工程] TU452[建筑科学—土工工程]