红层泥岩填料的力学特性及本构模型研究  

Mechanical properties and constitutive model of the red mudstone fill material

作　　者：余云燕[1] 崔文豪 罗崇亮 杜乾中 李盛[1] YU Yunyan;CUI Wenhao;LUO Chongliang;DU Qianzhong;LI Sheng(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《地震工程学报》2024年第1期1-9,共9页China Earthquake Engineering Journal

基　　金：甘肃省科技计划资助(21YF5GA050);甘肃省教育厅产业支撑计划项目资助(2021CYZC-28);甘肃省交通运输厅科技研发项目资助(2021-12);甘肃省基础研究创新群体项目(21JR7RA347)。

摘　　要：在红层泥岩地区进行道路工程施工时,考虑到材料短缺和成本问题,常常采用就地取材的方式作为路基填料。为了研究红层泥岩填料的适用性,选取甘肃省永登县某工点的风化红层泥岩填料为研究对象,在室内开展一系列三轴CU剪切试验,探究含水率、围压和压实度对应力-应变曲线、峰值(残余)强度、抗剪强度指标的影响,并对不同类型的应力-应变曲线,分别采用相应的模型进行拟合。研究结果表明:含水率、围压和压实度对其物理力学特性具有显著影响;对符合应变软化型规律的曲线,采用沈珠江的双曲线模型拟合的规律一般;对符合应变硬化型规律的曲线,采用Duncan-Chang模型拟合的规律较好。研究结果可以为甘肃省红层泥岩路基的病害处治与维修提供参考依据。To construct road engineering in red mudstone regions,local materials are often used as subgrade fillers because of the shortage of materials and cost problems.To study the applicability of red mudstone fill material,weathered red mudstone fill material from a site in Yongdeng County,Gansu Province,was selected as the research object.A series of consolidated undrained(CU)triaxial shear laboratory tests was conducted to explore the effects of water content,confining pressure,and compaction degree on stress-strain curve,peak(residual)strength,and shear strength index.Furthermore,different types of stress-strain curves were fitted with the corresponding models.The results show that water content,confining pressure,compaction degree affect the physical and mechanical properties of the red mudstone fill material.For curves conforming to strain softening law,the fitting effect of the generalized hyperbolic model of Shen Zhujiang is not good.For curves conforming to strain hardening law,the fitting effect of the Duncan-Chang model is good.The research results provide a reference for the treatment and maintenance of red mudstone subgrades in Gansu Province.

关 键 词：道路工程 红层泥岩填料 三轴CU剪切试验 沈珠江推广双曲线模型 DUNCAN-CHANG模型 

分 类 号：TU411[建筑科学—岩土工程]