改性膨胀土根土复合体抗剪强度试验研究  

Experimental Study on Shear Strength of a Root-Soil Composite of a Modified Expansive Soil

作　　者：王涛 胡波[2] 刘军[2] 陈品章 WANG Tao;HU Bo;LIU Jun;CHEN Pinzhang(Yangtze-to-Huaihe Water Diversion,Anhui Provincial Group Co.Ltd.,Hefei 230000;Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010;Anhui Communication Surveying and Design Institute Co.Ltd.,Hefei 230011)

机构地区：[1]安徽省引江济淮集团有限公司,合肥230000 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [3]安徽省交通勘察设计院有限公司,合肥230011

出　　处：《土工基础》2023年第5期835-840,共6页Soil Engineering and Foundation

基　　金：国家重点研发计划资助(2017YFC1501201);安徽省引江济淮集团有限公司科技项目资助(合同号:YJJH-ZT-ZX-20191031216,YJJH-ZT-ZX-20230118528)。

摘　　要：通过制备重塑根系加筋土试样进行室内直剪试验,探究压实度和含根量对改性膨胀土的抗剪强度的影响,试验结果表明:根土复合体重塑样的抗剪强度与法向压力的关系符合摩尔-库伦定律;复合体基材抗剪强度随压实度增加而增大,随含根量增多而增大,随着压实度增大,其粘聚力与内摩擦角均呈增大趋势,但粘聚力的增幅比内摩擦角大;含根量值与粘聚力呈正相关,而内摩擦角与含根量关系不大;重塑含根土样m值介于1.31~2.31之间,含狗牙根根土复合体在低应力条件下对土体强度的提高更为显著,表明狗牙根根系对于边坡浅层加固效果更好;植物根系显著增强了改性膨胀土的抗剪强度。To explore the effect of compaction and vegetation root content on the shear strength of the modified expansive soil,The root-soil composite samples of the modified expansive soil were prepared,and the direct shear tests were performed.The test results showed that the shear strength behavior of the remolded root-soil composite samples conform to the Coulomb equation.The shear strength of composite samples increases with the increase of the degree of compaction as well as the root content.With the increase of the degree of compaction,the cohesion and the internal friction angle increase,but the increase of the cohesion is greater than that of the internal friction angle.There is a positive correlation between the root content and the cohesion,c,while the internal friction angle,φ,has little relation with the root content;the m value of reshaped soil samples with roots is between 1.31 and 2.31,and the bermudagrass root-soil composite is at the low positive.It is more effective to improve the strength of the soil under the lower stress than the higher stress.The bermudagrass root system has a better effect on the shallow reinforcement of the slope;the plant root system has a good reinforcement effect on the modified expansive soil which significantly enhances the shear strength of the base material.Compared with the remolded soil,the binding force between the root and the soil of the undisturbed soil is larger,and the root system has a more obvious strengthening effect on the strength of the root-soil composite.

关 键 词：改性膨胀土 根土复合体 强度参数 压实度 

分 类 号：TU411[建筑科学—岩土工程]