不规则柱状节理岩体力学特性模型试验研究  

Model test research on the mechanical properties of irregular columnar jointed rock masses

作　　者：黄巍 肖维民[1,2] 田梦婷 张林浩[1,2] HUANG Wei;XIAO Wei-min;TIAN Meng-ting;ZHANG Lin-hao(School of Civil Engineering,Sichuan Agricultural University,Dujiangyan,Sichuan 611830,China;Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction,Sichuan Agricultural University,Dujiangyan,Sichuan 611830,China)

机构地区：[1]四川农业大学土木工程学院,四川都江堰611830 [2]四川农业大学村镇建设防灾减灾四川省高等学校工程研究中心,四川都江堰611830

出　　处：《岩土力学》2020年第7期2349-2359,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.41502242,No.41877195)。

摘　　要：结合Voronoi图随机模拟和3D打印技术制备不规则柱状节理网络模型,采用白水泥浆类岩石相似模型材料浇筑模型并拆模,然后分别采用白乳胶和502胶水作为黏结剂黏结柱体得到两组不规则柱状节理岩体试件,通过对其进行室内单轴压缩试验研究不规则柱状节理岩体强度特性和破坏模式。试验结果表明:不规则柱状节理岩体试件单轴抗压强度随柱体倾角的变化曲线呈现近似"J"型,表现出显著各向异性特征;不规则柱状节理岩体试件典型破坏模式包括沿柱状节理面的劈裂破坏、沿柱状节理面的剪切破坏和沿柱体的压裂破坏等3种,其部分破坏形态有异于规则柱状节理岩体试件。同时,通过与采用净水泥浆作为黏结剂的柱状节理岩体试验结果进行比较,结果表明:采用白乳胶和502胶水作为黏结剂时柱体间黏结强度更低,能够较好反映柱状节理面的弱化效应,试件力学响应与真实柱状节理岩体更为一致。Irregular columnar joints network models were firstly prepared by using the Voronoi diagram random simulation method and 3D printing technology.White cement slurries were chosen as the rock-like material and poured into the 3D printing irregular columnar joints network models.Then the single columns were removed from the 3D printing models,and the white latex and 502 glue were used to bond the single columns together.In doing this,the irregular columnar jointed rock mass specimens were obtained.Laboratory uniaxial compression tests were carried out on these specimens to investigate the strength and failure modes.The experimental results show that the changes in the uniaxial compressive strength against the dip angle β resembled a"J"shape trend,which indicates that the anisotropy of the uniaxial compressive strength is remarkable.Three typical failure modes are summarized,including splitting failure along the columnar joints,shear failure along the columnar joints and the axial compression failure along the single columns,and the failure patterns are somewhat different from those of the regular columnar jointed rock mass specimens.Furthermore,the experimental results in this study were compared with previous results with respect to the columnar jointed rock mass specimens bonded by pure cement slurry.The results show that the weaken effect of the columnar joints can be more adequately reflected using the specimens bonded by white latex and 502 glue than those bonded by cement slurry.

关 键 词：岩石力学 不规则柱状节理岩体 模型试验 单轴压缩试验 破坏模式 

分 类 号：TU452[建筑科学—岩土工程]