岩石结构面的浸水剪切蠕变特性及本构模型研究  

Study on Water Immersion Shear Creep Characteristics and Constitutive Model of Rock Joints

作　　者：刘洪磊[1] 杨晨 刘溪鸽 朱万成[1] LIU Honglei;YANG Chen;LIU Xige;ZHU Wancheng(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《金属矿山》2022年第9期71-80,共10页Metal Mine

基　　金：国家自然科学基金项目(编号52174070,51904057);中央高校基本科研业务费专项(编号:N2101026,N2101040)。

摘　　要：针对浸水与自然状态下砂岩硬性结构面开展了分级加载剪切蠕变试验,试验通过单轴压缩形式实现结构面法向应力与切向应力的等比例加载。试验结果表明:在岩石结构面发生加速蠕变之前,分级加载的瞬时变形存在着随加载应力逐渐减小的趋势。基于Norton-Bailey模型与Kachanov损伤模型提出了一个新的考虑结构面粗糙度、浸水条件、剪应力与压应力之比等因素的改进Norton-Bailey蠕变剪切模型。根据砂岩结构面剪切蠕变试验数据,分别拟合了浸水与自然状态下砂岩结构面蠕变剪切模型的参数。分析结果表明:所建立的改进Norton-Bailey蠕变剪切模型对于结构面的剪切蠕变结果具有较好的拟合效果,并可以反映结构面浸水弱化作用的影响。The hierarchical loading shear creep experiment was carried out for the hard joint surface of sandstone under water immersion and natural state.The normal stress and shear stress of the joint surface was loaded proportionally through uniaxial compression.The experimental results show that before the accelerated creep occurs on the rock joint,the instantaneous deformation caused by the graded loading tends to decrease gradually with the loading stress.Based on the Norton-Bailey model and the Kachanov damage model,a new improved Norton-Bailey creep-shear model was proposed,which involved the joint roughness efficient,immersion conditions,and the ratio of shear stress to normal stress.According to the shear creep experiment data of the sandstone joint surface,the parameters of the creep shear model of the sandstone joint surface under water immersion and natural state were fitted respectively.The results show that the improved Norton-Bailey creep shear model has a good fitting effect on the sandstone joint surface,and can reflect the influence of the weakening effect of water immersion on the joint surface.

关 键 词：硬性结构面 剪切蠕变 浸水弱化 粗糙度 

分 类 号：TD325[矿业工程—矿井建设]