摘要
以山西朔州麻家梁煤矿砂岩以及张集煤矿闪长岩为例,将岩样加工成60°,75°,90°三种倾角结构面的岩样,并对加工后的结构面进行水泥填充,进而研究3种倾角结构面对岩体力学特性与破坏形态的影响。单轴压缩试验与数值模拟试验结果表明:随着倾角的增大,两种岩性岩样单轴抗压强度都呈现上升的趋势,同条件下的闪长岩岩样单轴抗压强度要小于砂岩岩样单轴抗压强度;结构面倾角为60°与75°的岩样主要从顶部与侧面结构面附近萌生裂隙开始发生破坏,随着加载应力不断增大,岩体顶部应力集中部分将出现破碎并使岩体完全破坏,而结构面倾角为90°的岩样主要是由于岩体顶部萌生出大量竖向扩张劈裂隙使岩体发生破坏。
Taking the sandstone from Majialiang coalmine and the diorite from Zhangji coalmine as examples,the rock masses are processed into samples with structural planes of 60°,75° and 90°,which were filled with cement to study the influence of the rock mass with 3 structural planes on mechanics characteristic and destruction properties. The results of the uniaxial compression test and numerical simulation experiment show that with the increase of structural plane dip,the uniaxial compressive strength of the two kinds of samples increases,and the uniaxial compressive strength of the diorite sample is less than that of the sandstone sample under the same condition. The cracks that initiated near the top and the side of structure plane of 60° and 75° started to propagate,with the continuous increase of the load stress,fragmentation occurs at the top of the rock mass where the stress is concentrated,which caused the complete destruction of the rock mass; the rock samples with structural plane of 90° were destructed due to the large quantities of vertical and expansive hack cracks on the rock top.
出处
《人民长江》
北大核心
2016年第5期76-80,共5页
Yangtze River
基金
国家重点基础研究发展"973"计划项目资助(2011CB710604)
国家自然科学基金资助项目(41272305)
关键词
结构面
压缩试验
数值模拟
变形破坏
structural plane
compression test
numerical simulation
deformation and destruction
