含单裂隙复合岩层强度与裂纹扩展特征模拟研究  

A Simulation Study on Strength and Crack Propagation Characteristics of Layered Composite Rock With Single Fissure

作　　者：殷鹏飞[1] 杨圣奇[1] 曾卫[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《应用基础与工程科学学报》2015年第3期608-621,共14页Journal of Basic Science and Engineering

基　　金：国家重点基础研究发展计划973项目(2014CB046905)

摘　　要：与单一岩层类似,不同力学性质岩层复合而成的复合岩层中也有裂隙的存在,但其力学特性和裂纹扩展、破坏模式等却与单一岩层不尽相同.本文首先通过模拟试验确定出两种力学性质差异明显的软硬岩石材料,并以此为基础组成一种复合岩层的模拟模型;通过改变复合岩层夹层与加载力方向之间的夹角β,研究了单轴压缩下无裂隙、裂隙倾角α为45°与135°时复合岩层的峰值强度、弹性模量等宏观力学特性随β角变化而变化的规律,得到了不同β角时单裂隙在复合岩层中的扩展过程以及最后的贯通破坏模式,最后通过模拟试验过程中的声发射(AE)分析,探讨了复合岩层中单裂隙扩展过程中复合岩层内部的变化情况,分析了软硬复合岩层在单裂隙存在情况下单轴受压的破坏机理,为后续的相关试验与模拟研究工作做了初步试探.Similar to the monotonous rock,there are also exist fissures in the layered composite rock,which composed with materials varied with different mechanical properties,its mechanical properties and crack extension and failure mode are not the same as monotonous rock. This paper firstly establishes a layered composite rock model by way of a simulation test which produced two rock materials with different mechanical properties,high strength rock（ hard rock）and low strength rock（ soft rock） respectively. By changing the angle（ β） between the intercalation of layered composite rock strata and the direction of loading force,this paper investigated the change rule of macroscopic mechanical properties such as strength,elastic modulus,for the three groups which layered composite rock strata with no-fissure,fissure angleα = 45° and fissure angle α = 135°,with β varied from 0°—90°. This study also obtains the extension process of single fissure in the layered composite rock strata with β varied from 0°—90°,as well as the fracture penetration and failure mode. Finally,through the acoustic emission（ AE） analysis in the process of simulation test,this paper investigates the internal changes of layered composite rock strata in the process of single fracture extension,and,analyzed the failure mechanisms of hard and soft layered composite rock strata with single fissure under the axial compression test,and has made the preliminary test for the subsequent study.

关 键 词：复合岩层 单裂隙 强度 裂纹扩展 RFPA2D 

分 类 号：TU45[建筑科学—岩土工程]