文献类型：期刊文献

中文题名：变饱和度条件下粗糙岩石节理剪切强度特性的试验研究

英文题名：Experimental study on shear strength of rough rock joints under various saturations

作者：胡云进[1,2,3];王小宇[1,2,3];钟振[1,2,3];杨申东[1,2,3];宋忠阳[1,2,3]

机构：[1]绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000;[2]绍兴文理学院土木工程学院,浙江绍兴312000;[3]绍兴文理学院浙江省山体地质灾害防治协同创新中心,浙江绍兴312000

年份：2022

卷号：41

期号：2

起止页码：336

中文期刊名：岩石力学与工程学报

外文期刊名：Chinese Journal of Rock Mechanics and Engineering

收录：CSTPCD、、CSCD2021_2022、EI(收录号：20220611600489)、Scopus、北大核心、CSCD、北大核心2020

基金：国家自然科学基金资助项目(41977256);浙江省自然科学基金资助项目(LGJ20E090001,LY18E090004)。

语种：中文

中文关键词：岩石力学;剪切强度;饱和度;节理粗糙度;岩石节理;水–岩作用

外文关键词：rock mechanics;shear strength;saturation;joint roughness coefficient;rock joints;water-rock interactions

中文摘要：为探究节理剪切性质随饱和度变化的演变规律,首先采用三维激光扫描技术和3D打印技术相结合的手段,通过将水泥、砂、粉煤灰和水按1∶3∶0.4∶0.55的配比混合,从而复刻出3种不同粗糙度的类岩石节理,并根据计算得到的节理空隙体积对饱和度进行控制,随后采用自主研发的岩石直剪试验系统,对3种粗糙度的复刻节理开展了在常法向应力(0.2 MPa)和变饱和度条件下的直剪试验。试验结果表明,饱水时3种粗糙度的节理试样峰值剪切强度平均降低28.4%,不同粗糙度下峰值剪切强度分别降低35.7%(JRC=12.9),28.5%(JRC=10.1)和16.1%(JRC=7.3)。此外,随着饱和度的增大,节理残余剪切强度亦逐渐下降,降低幅度为7%~12%,其下降程度同样与粗糙度相关。通过进一步的分析表明:水的力学作用和对粗糙节理面的浸润作用是引起其剪切强度弱化的主要原因;随着粗糙度的增加,水-岩相互作用的面积增大,水对节理剪切强度的弱化程度相应地增强。所揭示的抗剪强度随饱和度增加而显著弱化的现象表明,对岩体工程进行设计时除了考虑水的影响外,还应对含水量(饱和度)可能导致的剪切强度弱化进行量化分析。

外文摘要：In order to investigate the change of the shear strength of rock joints with saturation,artificial rock joints with various roughness were reproduced by mixing cement,sand,fly ash and water at a mass ratio of 1∶3∶0.4∶0.55 based on 3 D-laser scanning and 3 D-printing technologies,and the saturation of the joints was controlled according to the calculated joint void volume. Subsequently,a series of direct shear tests were carried out on the reproduced joints with various roughness and saturations under a constant normal stress of 0.2 MPa.Experimental results indicate that the average peak shear strength of rock joints decreases by 28.4% when the saturation increases from 0 % to 100 %,and the peak shear strength of the rock joints with a JCR of 12.9,10.1 and 7.3 respectively decreases by 35.7%,28.5% and 16.1%. Besides,the residual shear strength also reduces with increasing the saturation,and the reductions dependent on the joint roughness range from 7%-12%. Further analysis shows that the weakening of the shear strength of rock joints arises from the mechanical effect and lubricating effect of water exerted on the rough joint surface,and that,as the joints get rougher,the water-rock interaction area becomes greater,inducing a higher deterioration in mechanical properties. According to the findings from this study,it is emphasized that the effect of the water saturation on the degradation of the shear strength should be analyzed when designing rock mass projects.