膨胀性对膨胀土强度影响的试验研究  

Experimental study of expansion influencing expansive soil strength

作　　者：刘述丽[1] 徐彬 殷宗泽[3,4] LIU Shuli;XU Bin;YIN Zongze(Department of Hydraulic Engineering,Zhejiang Tongji Vocational College of Science andTechnology,Hangzhou 311231,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,China;Key Laboratory of Geomechanics and Embankment Engineering,Ministryof Education,Hohai University,Nanjing 210098,China;Ggeotechnical Research Institute,HohaiUniversity,Nanjing 210098,China)

机构地区：[1]浙江同济科技职业学院水利工程系,浙江杭州311231 [2]中国电建集团华东勘测设计研究院浙江华东建设工程有限公司,浙江杭州311122 [3]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [4]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《河南科技学院学报（自然科学版）》2018年第2期72-78,共7页Journal of Henan Institute of Science and Technology(Natural Science Edition)

基　　金："十二五"国家科技支撑计划(2011BAB10B04)

摘　　要：为了研究不同膨胀性膨胀土强度的变化规律,通过对原始土料添加主要成分为蒙脱石的膨润土配制了不同膨胀性的试样,对不同膨胀性的试样分别进行了1~5次干湿循环过程,使试样具有不同的裂隙开展程度,对不同膨胀性及不同裂隙开展程度的试样拍照,并进行饱和状态下的抗剪强度试验.试验结果反映了干湿循环后膨胀性对试样裂隙开展程度、抗剪强度指标的影响以及膨胀性对膨胀土强度的影响仍是通过裂隙作用实现的,揭示了膨胀性对膨胀土强度影响的规律;给出了裂隙充分发展的强度指标随自由膨胀率变化的关系,建立了采用自由膨胀率来估算膨胀土饱和强度的经验公式.The paper considered that the strength of expansive soil is not only affected by saturation,density and degree of cracks,but also by their expansion.The test results showed that,the larger free swelling ratio,the higher development degree of cracks by wet-dry cycle,accordingly,strength index reduced more significantly.At the same time,the free swelling ratio affects strength index of c significantly,so the c value should be payed more attention when treating the expansive soil problem,especially for the case of highly expansive soil.

关 键 词：膨胀土 膨胀性 自由膨胀率 裂隙开展程度 

分 类 号：TU443[建筑科学—岩土工程]