含软弱夹层的层状岩体流变力学特性试验  

Experimental study on rheological properties of layered rock mass with soft interlayers

作　　者：徐卫亚[1,2] 黄威 张涛 孟庆祥[1,2] XU Weiya;HUANG Wei;ZHANG Tao;MENG Qingxiang(Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学岩土工程科学研究所,江苏南京210098 [2]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

出　　处：《河海大学学报（自然科学版）》2020年第4期327-333,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家重点研发计划(2018YFC0407004);国家自然科学基金(51939004)。

摘　　要：依据工程地质结构制作含软弱夹层的层状岩体试样,采用全自动三轴流变伺服系统进行三轴流变力学试验,研究含软弱夹层的层状岩体的流变变形规律及加速流变特性,依据岩体各级应力水平下的稳态流变速率确定岩体的长期强度,为工程岩体流变数值试验参数辨识提供参考。根据流变试验结果,提出反映不同岩层流变力学性质的层状岩体流变模型,在模型中引入损伤变量,使流变模型可以准确反映多层状岩体在不同应力水平下的损伤流变特性。对提出的非线性损伤流变模型进行参数辨识,拟合曲线与流变试验结果较吻合,验证了非线性损伤流变模型对层状岩体的适用性。The samples of layered rock mass with soft interlayers were made according to the geological structure of a hydropower project,and the triaxial rheological mechanics test was carried out under the action of seepage pressure by the automatic triaxial rheological servo system.The rheological properties and accelerated rheological properties of layered rock mass with soft interlayers are studied in this work.The long-term strength of rock mass is obtained according to the steady rheological rate of rock mass under different stress levels.It can provide reference for parameter identification of engineering rheological numerical tests of rock mass.According to the structural characteristics of layered rock mass with soft interlayers,a rheological model for the layered rock mass is proposed,which can reflect the rheological properties of layered composite rock mass.By introducing damage variables into the model,the rheological model can accurately reflect the rheological deformation characteristics of layered rock mass under different stress levels.Thereafter,the parameters of the proposed nonlinear damage rheological model were identified by the rheological test curve.The fitting curve fits well with the rheological test results,which verifies the applicability of the nonlinear damage rheological model to the layered rock mass.

关 键 词：岩土力学 层状复合岩体 软弱夹层 流变 长期强度 流变模型 损伤变量 

分 类 号：TU45[建筑科学—岩土工程]