不同形态下红砂岩力学特性和裂纹断裂特征研究  

Study on Mechanical Properties and Crack Fracture Characteristics of Red Sandstone Under Different Morphology

作　　者：谢雨霖 李小双 耿加波 杨舜 李启航 原粲茗 XIE Yulin;LI Xiaoshuang;GENG Jiabo;YANG Shun;LI Qihang;YUAN Canming(School of Resource and Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;School of Civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000,China;College of Civil Engineering,Qilu Institute of Technology,Jinan,Shandong 250200,China;Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan,Anhui 243000,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西赣州市341000 [2]绍兴文理学院土木工程学院,浙江绍兴市312000 [3]齐鲁工学院土木工程学院,山东济南250200 [4]中钢集团马鞍山矿山研究院有限公司,安徽马鞍山市243000

出　　处：《矿业研究与开发》2022年第6期119-125,共7页Mining Research and Development

基　　金：国家自然科学基金项目(41702327,41867033);中国博士后科学基金项目(2019M650144);金属矿山安全与健康国家重点实验室开放基金项目(zdsys2019-005)。

摘　　要：为探究不同形态下红砂岩的力学特性变化以及裂纹断裂形态的发展,改变红砂岩的含水率以及预制不同倾角的裂隙,在单轴压缩条件下研究其抗压强度的变化,同时通过图像处理对产生的裂纹进行量化分析,研究不同含水率、不同裂隙倾角、不同裂隙长度情况下试件的裂纹发展特征以及破坏形态。研究表明:单轴压缩下含水率的增加使红砂岩试件抗压强度降低,裂纹形态变复杂;预制裂隙倾角为0时,试件出现了不同于其他裂纹倾角下的特殊裂纹发展形态,裂纹倾角为45°的试件,其抗压强度最低,产生的分支裂纹较少;试件预制裂隙长度越长,其抗压强度越低,裂纹率和崩坏面积系数越小,裂纹增长速率增大。试验所得结论较为全面地记录了不同形态下红砂岩的裂纹发展变化,对红砂岩裂纹发展的进一步研究提供了依据。In order to explore the changes in the mechanical properties of red sandstone with different morphology and the development of crack and fracture shapes, by changing the water content of red sandstone samples and preparing cracks with different angles, the change of compressive strength of red sandstone samples under uniaxial compression was studied. At the same time, the quantitative analysis of the cracks was carried out through image processing, and the crack development characteristics and failure modes of the samples with different water contents, different crack angles and different crack lengths were studied. The results are concluded as follows. Under uniaxial compression, the compressive strength of red sandstone samples decreases and the crack shapes become complex with the increase of water content. When the prefabricated crack angle is 0, the sample has a special crack development shape, which is different from that under other crack angles. When the prefabricated crack angle is 45°, the sample has the lowest compressive strength and fewer branch cracks. The longer the length of prefabricated crack, the lower the compressive strength, the smaller the crack rate and collapse area coefficient, and the higher the crack growth rate. The conclusions obtained from the test can comprehensively record the crack development under different morphology of red sandstone, and provide a basis for further study on the crack development of red sandstone.

关 键 词：红砂岩 单轴压缩 预制裂隙 抗压强度 裂纹形态 

分 类 号：TD313[矿业工程—矿井建设]