含预制断续裂隙类岩石材料力学特性试验及数值模拟研究  

Experimental and Numerical Simulation Study on Mechanical Properties of Sandstone with Prefabricated Intermittent Fissures

作　　者：刘树新 郑旭 丁凯 张东杰 LIU Shu-xin;ZHENG Xu;DING Kai;ZHANG Dong-jie(Institute of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010

出　　处：《水电能源科学》2023年第4期181-185,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51264028);内蒙古自治区自然科学基金项目(2021LHMS05017);内蒙古自治区高等学校科学研究项目(NJZY11147)。

摘　　要：为了研究含预制裂隙岩石的力学特性,制备不同角度的断续裂隙类岩石试件,对含裂隙岩石试件进行单轴试验,发现倾角40°断续裂隙的单轴抗压强度最大,60°次之,20°最小。使用PFC2D对试验过程进行模拟,并分析试验过程中微裂纹与应力的变化规律,发现岩桥强度对试件单轴抗压强度具有重要影响,通过对比发现数值模拟的应力-应变曲线的变化规律与物理试验结果基本一致。In order to study the mechanical properties of rocks with prefabricated fissures,rock specimens with mittent inter-fissures at different angles were prepared.Uniaxial compression test was carried out on the specimens with sures fis-using uniaxial compression test equipment.It is found that the uniaxial compressive strength of 40°intermittent sures fis-is the largest,followed by that of 60°and 20°.The PFC2D was used to simulate the test process.The change law of microcrack and stress in the test process was analyzed.It is found that the strength of rock bridge has an important pact im-on the uniaxial compressive strength of the specimen.Through comparison,the change law of stress-strain curve of numerical simulation is basically consistent with that of physical test.

关 键 词：预制裂隙 单轴压缩 PFC2D 数值计算 

分 类 号：TV223.1[水利工程—水工结构工程] TU452[建筑科学—岩土工程]