考虑物理指标的黏性土抗剪强度指标分析  

Analysis of shear strength index of clay considering physical indexes

作　　者：张庆贺 吴明明 张岗平 康宝祥 徐日庆[4] ZHANG Qing-he;WU Ming-ming;ZHANG Gang-ping;KANG Bao-xiang;XU Ri-qing(School of Architecture Engineering,Xuzhou College of Industrial Technology,Xuzhou 221000,Jiangsu,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,Zhejiang,China;School of Transportation Engineering,Xi'an Vocational University of Automobile,Xi'an 710600,Shaanxi,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China)

机构地区：[1]徐州工业职业技术学院建筑工程学院,江苏徐州221000 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [3]西安汽车职业大学交通工程学院,陕西西安710600 [4]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058

出　　处：《地基处理》2023年第5期391-397,共7页Journal of Ground Improvement

摘　　要：以杭州某地区的黏性土为研究对象,通过UU、CU、CD三轴压缩试验,分析内摩擦角、黏聚力与塑性指数、含水率、液性指数之间的关系。结果表明,黏聚力与塑性指数具有较高的线性负相关性,斜率范围为-3.88~-3.34。内摩擦角与液性指数的相关性比其与其他物理指标相关性高。c_(cu)/c_(uu)和c_(cd)/c_(uu)随着含水率、塑性指数增加呈增大趋势。c_(cu)/c_(uu)范围在1.1~1.9之间;c_(cd)/c_(uu)范围在1.2~2.0之间。c_(cd)-c_(cu)范围在1~4 kPa之间;随着塑性指数的增大,c_(cd)-c_(cu)减小。φ_(cd)/φ_(cu)值接近于1。φ_(cd)-φ_(cu)范围在2°~6°之间,随着塑性指数增大呈下降趋势;当I_(p)>18时,φ_(cd)-φ_(cu)的值不再随塑性指数变化而变化。研究结果可为预估黏性土的强度参数值提供参考。This study focuses on the cohesive soil in Hangzhou and analyzes the relationship between internal friction angle,cohesion,and plasticity index,as well as water content and liquid index,using triaxial compression tests(UU,CU,and CD).The results reveal a significant linear negative correlation between cohesion and plasticity index,with a slope range of-3.88 to-3.34.Moreover,the correlation between the internal friction angle and the liquid index is stronger compared to the other physical indexes.The c_(cu)/c_(uu) and c_(cd)/c_(uu) increase with the increase of w and I_(p).The range of ceu/cu is between 1.1 and 1.9.The range of c_(cu)/c_(uu) is between 1.2 to 2.0.c_(cd)-c_(cu) ranges from 1 to 4 kPa,and the c_(cd)-c_(cu) decreases with the increase of plasticity index.The value φ_(cd)/φ_(cu) is close to 1.φ_(cd)/φ_(cu) ranges from 2°to 6°,and decreases with the increase of I_(p).When I_(p)>18,the value of φ_(cd)-φ_(cu) does not change with the change of I_(p).These research findings offer valuable references for predicting the strength parameters of clay.

关 键 词：抗剪强度指标 黏性土 含水率 塑性指数 液性指数 

分 类 号：TU41[建筑科学—岩土工程]