干湿循环作用下裂隙岩石力学特性及破坏模式分析  

Analysis of Mechanical Properties and Failure Mode of Fractured Rock Under Dry Wet Cycle

作　　者：陈鑫峰 张治强 梅位行 刘秀良 杨彧 石勇宾 CHEN Xinfeng;ZHANG Zhiqiang;MEI Weihang;LIU Xiuliang;YANG Yu;SHI Yongbin(School of Mining Engineering,University of Science and Technology Liaoning,Anshan,Liaoning 114051,China;Engineering Research Center of Green Mining of Mental Mineral Resources Liaoning Province,Anshan,Liaoning 114051,China)

机构地区：[1]辽宁科技大学矿业工程学院,辽宁鞍山市114051 [2]辽宁省金属矿产资源绿色开发工程研究中心,辽宁鞍山市114051

出　　处：《矿业研究与开发》2023年第4期82-87,共6页Mining Research and Development

基　　金：“十三五”国家重点研发计划项目(2016YFC0801603)。

摘　　要：为研究酸性干湿循环条件下,裂隙数目(0, 1, 2, 3条)对砂岩的力学特性及破坏模式的影响,将试样分别在pH为2.0, 4.5, 7.0的溶液中进行0, 1, 3, 5次浸泡-风干循环,然后开展单轴压缩试验。结果表明:随着干湿循环次数及裂隙数目的递增,浸泡在不同pH溶液中的试样峰值强度和弹性模量均逐渐减小,且其所造成的损伤劣化加剧了试样在化学溶液中浸泡受到的腐蚀损伤;在pH为7.0时,宏观裂隙诱导了砂岩破坏时裂纹的发展,且随着裂隙数目的增加,砂岩的破坏模式由剪切破坏转变为拉剪破坏。In order to study the influence of the number of cracks(O,1,2 and 3)on the mechanical properties and failure mode of sandstone under the condition of acid dry wet cycle,the specimens were immersed in solutions with pH of 2.0,4.5 and 7.0 for O,l,3 and 5 times and then subjected to uniaxial compression tests.The results show that the peak strength and elastic modulus of the specimens immersed in different pH solutions gradually decrease with the increase of the number of dry wet cycles and the number of cracks,and the deterioration of the damage caused by it aggravates the corrosion damage of the specimens immersed in chemical solutions.When the pH is 7.O,macro cracks induce the development of cracks in sandstone failure,and with the increase of the number of cracks,the failure mode of sandstone changes from shear failure to tension-shear failure.

关 键 词：干湿循环 裂隙岩石 单轴压缩 岩石力学特性 破坏模式 

分 类 号：TD315[矿业工程—矿井建设]