麦秸秆加筋石灰土的抗剪强度及剪切破坏形式  

Shear strength and failure form of lime-soil reinforced with wheat straw

作　　者：李敏[1,2] 柴寿喜[2] 杜红普[3] 魏丽[2] 石茜[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000 [2]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384 [3]河北工业大学土木工程学院,天津300401

出　　处：《深圳大学学报（理工版）》2011年第1期65-71,共7页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(40772166);天津市高等学校科技发展基金资助项目(20090901)~~

摘　　要：选取整体均匀布筋、上部均匀布筋和下部均匀布筋3种布筋位置,借助三轴压缩实验,研究布筋位置对麦秸秆加筋石灰土抗剪强度的影响及3种布筋位置加筋土的破坏形式.结果表明,布筋位置主要影响土的黏聚力,对内摩擦角的影响较小,适宜的麦秸秆布筋方式可有效提高土的黏聚力;石灰土呈脆性破坏,3种布筋位置的麦秸秆加筋石灰土的破坏均在未加筋区域产生,加筋部位土的变形较小;石灰土和麦秸秆加筋石灰土的破坏面倾角均符合Mohr-Coulomb破坏准则和SMP(spatial mobilization plane)破坏准则.借助麦秸秆的高抗拉性能、空间交织作用和筋土摩擦作用,可有效约束土的变形,提高土的强度.The reinforcement effect and strength of reinforced soil depending on a suitable reinforced position and triaxial shear test for reinforced lime-soil with wheat straw in three positions was carried out in this paper.First,reinforced position mainly affects the cohesion of reinforced soil,but has little influence on the internal friction angle;reasonable reinforced position plays an important role in improving strength of reinforced soil.Second,lime-soil displays failure in brittle manner;failure of reinforced lime-soil is located in un-reinforced region;the deformation in reinforced region decreases.Third,shear angle of lime-soil and reinforced lime-soil with wheat straw conform to the Mohr-Coulomb failure criterion and SMP（spatial mobilization plane） failure criterion.By the function of high tensile strength,space interweaving and load-sharing of wheat straw,the strength and anti-deformation of reinforced soil is improved.

关 键 词：工程力学 加筋土 抗剪强度 布筋位置 破坏形态 麦秸秆 滨海盐渍土 

分 类 号：TU443[建筑科学—岩土工程]