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麦秸秆的筋土摩擦性能及加筋作用
魏丽, 柴寿喜, 蔡宏洲, 郑娇娇, 姜宇波
天津城建大学 地质与测绘学院, 天津 300384
摘要:
为研究麦秸秆加筋土的筋土作用与加筋效果,以含水率、干密度及麦秸秆埋置深度为影响因素,开展了麦秸秆与盐渍土的拉拔摩擦实验;完成了盐渍土、麦秸秆加筋盐渍土、石灰固化土、麦秸秆与石灰加筋固化土的抗压实验和三轴压缩实验。结果表明:麦秸秆与盐渍土的拉拔摩擦强度随含水率的增大而减小,随干密度和埋置深度的增加而增大,干密度、含水率、埋置深度对筋土摩擦作用的影响程度依次减小;与盐渍土及石灰固化土相比,麦秸秆加筋大幅提高了土的抗压强度、抗剪强度与抗变形性能。麦秸秆具有良好的筋土摩擦性能和加筋效果,麦秸秆加筋能有效增强土的力学性能。
关键词:  麦秸秆  筋土摩擦  加筋土  抗压强度  抗剪强度
DOI:10.11835/j.issn.1674-4764.2018.06.008
分类号:TU472
基金项目:天津市科技支撑计划(15ZXCXSF00070);天津市自然科学基金(17JCYBJC22200、17JCZDJC39200);天津市城市建设委员会科技项目(2015-12);天津市高等学校科技发展基金计划项目(20120911)
Frictional characteristics of wheat straw in saline soil and evaluation of reinforcing effect
Wei Li, Chai Shouxi, Cai Hongzhou, Zheng Jiaojiao, Jiang Yubo
School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, P. R. China
Abstract:
To examine the frictional characteristics of wheat straw in saline soil, which is influenced by water content, dry density and embedment length of wheat straw, the pulling-out test is carried out. The unconfined compressive test and triaxial test of four kinds of samples, including saline soil, wheat straw-saline soil, lime-saline soil and wheat straw-lime-saline soil, were conducted. The results showed that the friction strength decreases with the increase of water content, and increases when the dry density and embedment length increase. It has been certified that the influences from the dry density, water content and the embedment length on friction strength decrease successively. In comparison with saline soil and lime-saline soil, unconfined compressive strength, triaxial shear strength and deformation resistance of the soil are significantly improved due to the added wheat straw. The frictional characteristics of wheat straw in saline soil have been revealed and the reinforcing effect is considerable, providing an effective method for soil stabilization.
Key words:  wheat straw  frictional characteristics  reinforced soil  compressive strength  shear strength
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