加筋体与土体界面力学特性试验研究进展综述  

Research Progress of Interface Mechanical Characteristics Between Reinforcement and Soil

作　　者：丁鲁强 李大勇[1,2] DING Luqiang;LI Dayong(Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,College of Civil Engineering and Architecture,Fuzhou Universit)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]福州大学土木工程学院,福建福州350108

出　　处：《山东科技大学学报（自然科学版）》2018年第3期59-65,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51379118);山东科技大学科研创新团队项目(2015TDJH104)

摘　　要：加筋土中的土工合成材料可提高土体的抗剪强度,改善黏性土的黏聚力和渗透性,改良黄土和膨胀土的不良工程性质。分析了直剪、拉拔及三轴试验测试加筋土筋土界面力学特性的局限性:对直剪试验而言,土样的剪切面限定在上下剪切盒之间,而不是沿其最薄弱面剪切破坏;拉拔试验试样制作过程中土中加筋体不可避免发生凹凸变形;三轴试验在试样中分布几层加筋材料,尺寸效应十分明显。新型全球数字系统(global digital systems,GDS)界面剪切试验仪能够克服上述3种试验方法的不足,为研究筋土界面力学特性提供了有利工具。Geosynthetics in the reinforced soil can enhance the shear strength of soil,improve the cohesion and permeability of cohesive soil,and ameliorate the poor engineering properties of loess and expansive soil.The shortcomings of the direct shear test,the pull-out test and the triaxial test in analyzing the interface mechanical characteristics between the reinforcement and soil were studied.In the direct shear test,the shear plane was confined between the upper and lower shear boxes,rather than along the weakest shear plane.In the pull-out test,the reinforcement suffered from a concave and convex deformation in the preparation of soil samples.In the triaxial test,the size effect of layers of reinforcement material distributed in the samples was obvious.The global digital systems（GDS）interface shear test apparatus can overcome the shortcomings of the above test methods and provides a beneficial tool for studying the interface mechanical characteristics of the reinforced soil.

关 键 词：加筋土 界面力学特性 直剪试验 拉拔试验 三轴试验 GDS界面剪切试验仪 

分 类 号：TU411[建筑科学—岩土工程]