三剪统一屈服准则在柱形孔扩张问题中的应用  

Application of the Triple-shear Unified Yield Criterion in the Expansion of Cylindrical Cavity

作　　者：胡小荣[1] 张文完[1] 

机构地区：[1]南昌大学建筑工程学院,江西南昌330031

出　　处：《南昌大学学报（工科版）》2010年第3期260-264,共5页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(10862004);江西省自然科学基金资助项目(2007GZC2073)

摘　　要：基于三剪统一屈服准则,通过用3条折线来描述土体的本构特征,对柱形孔扩张问题进行分析,考虑岩土材料的软化和剪胀特性,推导出柱形孔扩张问题下的应力场、应变场、扩张压力、塑性区半径的解析解。算例表明,临界扩孔压力随土的软化程度的减小而增大,在一定剪胀和软化程度下,临界扩孔压力随b的增大而增大。A unified analytical solution to the stress fields,stain fields,expansion pressure and radius of the plastic is given by considering the strain-softening and shear dilatation characteristics of geotechnical material,basing on the triple-shear unified yield theory and the constitutive relation with the three-line of the soils.The calculation shows that the critical expansion pressure increases with the decreasing of softening.In a certain degree of shear dilation and softening,the critical expansion pressure increases with the increase of b.

关 键 词：三剪统一屈服准则 剪胀 软化 柱形孔扩张 

分 类 号：TU433[建筑科学—岩土工程]