深厚复合软土地层力学参数试验对比研究  

Comparative study on mechanical parameters of deep composite soft stratum by different test methods

作　　者：刘皓 杜学才 骆行文[3] 赵利鹏 龙杰 何志攀 LIU Hao;DU Xuecai;LUO Xingwen;ZHAO Lipeng;LONG Jie;HE Zhipan(PowerChina Kunming Engineering Corporation Limited,Kunming 650051,China;Yunnan Dianzhong Water Diversion Engineering Co.,Ltd.,Kunming 650000,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]中国电建集团昆明勘测设计研究院有限公司,云南昆明650051 [2]云南省滇中引水工程有限公司,云南昆明650000 [3]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《人民长江》2023年第5期204-210,217,共8页Yangtze River

基　　金：云南省重大科技专项计划项目(202002AF080003)。

摘　　要：土体抗剪强度、压缩模量及静止侧压力系数是深埋引水隧洞设计和施工的重要力学参数。通过试验对滇中引水工程昆明城区深厚复合软土地层的力学参数分布特征进行研究,并对不同试验方法获得的力学参数其关联性进行分析。研究结果表明:三轴(UU)试验获得的土层摩擦角较快剪试验获得的摩擦角小,而黏聚力大于快剪试验土体黏聚力,两种试验获得的黏聚力、内摩擦角均具有良好的线性关系。土层埋深较浅时,旁压试验和固结试验获得的压缩模量相近;土层埋深较大时,旁压试验获得的压缩模量小于固结试验获得的压缩模量。深厚复合软土地层的静止压力系数K 0与深度不相关,其大小主要受土性的影响;利用旁压试验进行K 0测试与室内K 0测试获得的结果相近,验证了旁压试验在深厚复合软土地层中进行K 0测试的适用性。研究结果对指导滇中引水工程及类似深埋岩土工程的设计施工有较强参考意义。The shear strength,compressive modulus and static lateral pressure coefficient are important mechanical parameters for the design and construction of deep buried diversion tunnels.By a large number of tests,the distribution characteristics of mechanical parameters of deep composite stratum in Kunming urban area,a part of water diversion project in central Yunnan,were researched,and the correlations of mechanical parameters by different tests were analyzed.The results show that the friction angle of soil tested by triaxial(UU)tests are smaller than that tested by rapid shearing tests,while the cohesion of soil tested by triaxial(UU)tests are larger than that tested by rapid shearing tests.Both cohesion and internal friction angle tested by the two kinds of tests have good linear relationship.When the buried depth of the stratum is shallow,the compressive modulus measured by the manometer test is similar to that measured by the consolidation test.When the buried depth of the stratum is large,the compressive modulus measured by the manometer test is smaller than that measured by the indoor consolidation test.The static lateral pressure coefficient K 0 of stratum is not related to its depth.K 0 is mainly affected by the properties of the stratum itself.The K 0 value of the manometer test is similar to that of the laboratory test,which verifies the applicability of pressuremeter tests in deep composite soft stratum.

关 键 词：深厚复合软土地层 静止侧压力系数 快剪试验 三轴试验 

分 类 号：TU41[建筑科学—岩土工程]