含水率对土石混合料力学特性影响试验研究  

Experimental study on the influence of moisture content on the mechanical properties of soil-rock mixture

作　　者：吕玺琳[1] 程博文 张甲峰 晏友波 徐柯锋 朱长根 LV Xi-lin;CHENG Bo-wen;ZHANG Jia-feng;YAN You-bo;XU Ke-feng;ZHU Chang-gen(Department of Underground Architecture and Engineering,Tongji University,Shanghai 200092,China;Shanghai Civil Aviation New Era Airport Design and Research Institute Co.,Ltd.,Shanghai 200335,China;Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]上海民航新时代机场设计研究院有限公司,上海200335 [3]上海宝冶集团有限公司,上海200941

出　　处：《地基处理》2023年第2期97-104,共8页Journal of Ground Improvement

基　　金：广西重点研发项目资助(AB22080032)。

摘　　要：为研究初始含水率对土石混合料力学特性的影响,选取典型土石混合料开展大型三轴固结排水剪切试验。结果表明,随着初始含水率增加,土石混合料应力-应变曲线呈下降趋势,且围压越高下降幅度越明显。高围压、高含水率将抑制土石混合料剪胀,且剪缩特性更明显,从而应力-应变关系逐渐由硬化软化组合型过渡到持续硬化型。土石混合料剪切强度与正应力呈现非线性关系,含水率增大将导致土石混合料剪切强度参数减小。通过邓肯-张模型较好地拟合了土石混合料的应力-应变关系,并得出了材料参数随含水率的变化规律。In order to study the influence of initial moisture content on the mechanical properties of soil-rock mixture,a series of large-scale triaxial consolidated drained shear tests were carried out on a typical soil-rock mixture material.The results show that with the increase of initial moisture content,the stress-strain curve of soil-rock mixture shows a downward trend.The higher the confining pressure is,the more obvious the downward trend is.High confining pressure and high moisture content inhibit the shear expansion of soil-rock mixture,and the shear induced contractancy is more obvious.The stress-strain relationship gradually changes from the hardening-to-softening type to the pure hardening type.The shear strength and normal stress of soil-rock mixture exhibit a nonlinear relationship.The increase of moisture content will reduce the shear strength parameters of soil-rock mixture.The stress-strain relationship of soil-rock mixture is well fitted by Duncan-Chang model,and the variation law of material parameters with moisture content is obtained.

关 键 词：土石混合料 含水率 大三轴试验 强度 邓肯-张模型 

分 类 号：TU41[建筑科学—岩土工程]