摘要
为了探究矿山高湿环境下围岩体的力学特性,基于自制的湿度环境控制模拟装置,研究单轴压缩条件下不同相对湿度条件(70%,80%,90%和100%)下的砂岩试样的力学特征及劣化机理。研究结果表明:1)随着环境相对湿度的增加,砂岩的孔隙度逐渐增加,而质量和强度均明显降低,但湿度对试件的腐蚀能力在达到一定时间后变弱;2)在单轴压缩条件下砂岩的声发射变化规律与应力演化特征较为一致,高湿环境下试样声发射事件数量比干燥条件下明显减少;3)随着环境相对湿度的增大,砂岩破碎的分形维数逐渐增大,分形位置参数和碎块尺度参数值逐渐变小,砂岩破坏后碎块尺寸和分布集中程度逐渐变小。4)砂岩钠长石和方解石峰值衍射强度及矿物含量均随相对湿度的增大而降低,而微裂纹大小及数量则随相对湿度的增大而增大,高湿环境下砂岩的损伤劣化机理包含了物理和化学侵蚀等联合作用结果。研究结果将为矿山高湿环境下围岩稳定性控制提供一定的参考。
In order to explore the mechanical properties of surrounding rock mass in high-humidity environment of mine,based on the self-made humidity environment control simulation device,the mechanical characteristics and deterioration mechanism of sandstone samples at different relative humidity conditions(70%,80%,90%and 100%)under uniaxial compression were studied.The results show that:1)With the increase in relative humidity,the porosity of sandstone increases gradually,while the mass and strength decrease obviously,but the corrosion ability of humidity to specimens decreases after reaching a certain time;2)The acoustic emission variation of sandstone under uniaxial compression is consistent with the stress evolution characteristics,and the number of acoustic emission events in the high humidity environment is significantly lower than that under the dry condition;3)As the relative humidity of the environment increases,the fractal dimension of sandstone fragmentation gradually increases,the fractal position parameters and fragment scale parameters gradually decrease,and the fragment size and distribution concentration gradually decrease after sandstone failure;4)The peak diffraction intensity and mineral content of sandstone albite and calcite decrease with the increase of relative humidity,while the size and number of microcracks increase with the increase of relative humidity.The damage and deterioration mechanism of sandstone under high-humidity environment includes the combined effect of physical and chemical erosion.The research results will provide necessary references for the stability control of surrounding rock in high humidity environment of mine.
作者
吴秋红
杨毅
张科学
李逸婧
陈伟
刘兆丰
WU Qiu-hong;YANG Yi;ZHANG Ke-xue;LI Yi-jing;CHEN Wei;LIU Zhao-feng(Work Safety Key Laboratory on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China;School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hebei Key Laboratory of Mine Intelligent Unmanned Mining Technology,North China Institute of Science and Technology,Beijing 101601,China;Department of Building Engineering,Hunan Institute of Engineering,Xiangtan 411104,China)
基金
Project(51904101)supported by the National Natural Science Foundation of China
Projects(22B0732,22A0351)supported by the Scientific Research Foundation of Hunan Provincial Education Department,China
Project(2023JJ40212)supported by the Natural Science Foundation of Hunan Province,China
Project(23107)supported by Hunan Institute of Engineering Student Innovation and Entrepreneurship Training Program,China
Project(iium006)supported by the Hebei Key Laboratory of Mine Intelligent Unmanned Mining Technology(North China Institute of Science and Technology),China。
关键词
高湿环境
砂岩
分形维数
劣化机理
单轴压缩
high humidity environment
sandstone
fractal dimension
deterioration mechanism
uniaxial compression
