加筋红土的广义等效围压和极限平衡条件  

Generalized equivalent confining pressure and limited balance conditions of reinforced laterite

作　　者：黄英[1] 符必昌[1] 金克盛[1] 龚羊庆[1] 李琴书[1] 

机构地区：[1]昆明理工大学,昆明650051

出　　处：《岩土力学》2007年第3期533-539,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.59968002);云南省自然科学基金(No.2004E0023M);云南省教育厅教学科研带头人培养基金

摘　　要：从加筋土体中筋材的作用相当于等效围压的概念出发,提出了一般加筋土体广义等效围压的概念。基于加筋前后土体达到相同强度的围压差,建立起包含传统等效围压的广义等效围压计算式;根据加筋土体仍然服从于莫尔-库仑强度理论,引入两个加筋指数α,β来反映筋材对土体抗剪强度的影响,建立起包含传统极限平衡关系的加筋土体极限平衡条件;并讨论了不同排水条件和筋材性质对加筋指数的影响。红土加柔性筋材试验结果表明,不同排水条件下,α基本接近于1;β随排水条件而变化,完全排水条件下的β大于1,完全不排水条件下的β小于1。固结不排水条件下的β有时大于1,有时小于1,可能与加筋层数和筋材性质有关;加筋红土在完全排水条件下的广义等效围压为正,在完全不排水条件和固结不排水条件加筋层数较少时的广义等效围压为负;β和广义等效围压都随加筋层数的增加而增大。A new definition of generalized equivalent confining pressure is proposed in term of that the function of reinforcing material in the reinforced soil is equivalent to confining pressure. Expression of the generalized equivalent confining pressure is set out by difference of confining pressures between reinforced and un-reinforced soll samples at the same strength. And limited balance equation of reinforced soil, in which 2 indexes （α,β） are used to estimate the strengthening effects of the materials, is carded out according to the fact that the Mohr-Coulomb theory is also obeyed in reinforced soil. The tests of laterite reinforced by flexible materials show that, the index α is close to 1 in different drainage conditions,＇and the index β varies with drainage conditions in which it is greater than 1 when drained entirely and smaller than 1 when not drained; and it is related to rows and properties of the reinforcing materials when concreted but un-drained, the generalized equivalent confining pressure is minus when not drained or concreted but not drained and positive when drained entirely. The index β and the generalized equivalent confining pressure increase when more materials used.

关 键 词：加筋红土 广义等效围压 极限平衡条件 加筋指数 

分 类 号：TU432[建筑科学—岩土工程]