工程地质学报2024，Vol.32Issue(1)：108-119,12.DOI:10.13544/j.cnki.jeg.2021-0707
循环水岩作用下煤岩组合体力学响应及劣化机制
MECHANICAL RESPONSE AND DETERIORATION MECHANISM OF COAL-ROCK COMBINED BODY UNDER THE ACTION OF CIRCULATING WA-TER-ROCK
摘要
Abstract
The establishment of underground reservoirs in coal mines has addressed the issue of water scarcity in arid-semi-arid ecologically fragile areas in western China.The repeated rise and fall of the water level in the ground-water reservoir has a damaging effect on the semi-coal-rock dam body and the coal-rock gangue dam body.Based on this,axial compression tests of sandstone-coal assemblies with different"dry-saturated"cyclic immersion times un-der various confining pressures are designed and conducted,and the deterioration law and mechanism of mechanical properties of coal-rock assemblages under cyclic flooding are analyzed.The results show that:(1)the saturated wa-ter content of the composite increases with the increase of cyclic immersion times.There is a logarithmic relationship between saturated moisture content and cyclic immersion times.(2)with the increase of cyclic immersion times,the compaction stage of the stress-strain curve increases,the slope of the elastic stage decreases,the peak stress de-creases,the peak strain increases,the yield stage becomes more obvious,and the stress drop slows down.(3)with the increase of cyclic immersion times,the compressive strength of the composite decreases gradually,and the com-pressive strength deteriorates obviously after cyclic immersion 1 to 3 times.The degree of deterioration in the stage of compressive strength is non-uniform.(4)after cyclic immersion 5 times,the cohesion decreases by 70.87％,and the internal friction angle decreases by 60.65％.(5)after cyclic immersion in water for 1 to 3 times,the elastic modulus of the composite decreases by 53.06％,and the deformation modulus decreases by 61.10％.(6)under the action of cyclic immersion,the micro-cracks of the samples gradually develop,the mineral particles gradually change from the original angular polygon to a round shape,the large mineral particles gradually disintegrate into small particles,and the cementation between the particles gradually weakens from a compact and strong structure to a loose and weak structure.(7)under the action of cyclic flooding,water and rock undergo repeated physical,chemical,and mechanical actions,resulting in repeated damage to coal and rock,leading to the deterioration of macroscopic mechanical properties.关键词
循环浸水/煤岩组合体/力学特性/劣化/试验研究Key words
Cyclic flooding/Coal-rock combined body/Mechanical properties/Deterioration/Experimental study分类
矿业与冶金引用本文复制引用
陈光波,李元,李谭,张俊文,张国华..循环水岩作用下煤岩组合体力学响应及劣化机制[J].工程地质学报,2024,32(1):108-119,12.基金项目
国家自然科学基金资助项目(资助号:52304142,52064042),越崎杰出学者资助项目(资助号:2020JCB01),自治区直属高校基本科研业务费项目(资助号:2023QNJS108),内蒙古自治区高等学校青年科技英才支持计划项目(资助号:NJYT22073),内蒙古自治区自然科学基金项目(资助号:2022MS05037).This research is supported by the National Natural Science Foundation of China(Grant Nos.52304142,52064042),the Yue Qi Distinguished Schol-ar Project(Grant No.2020JCB01),the Basic Scientific Research Fees of Colleges and Universities Directly under Inner Mongolia Autonomous Re-gion(Grant No.2023QNJS108),Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region(Grant No.NJYT22073)and Natural Science Foundation of Inner Mongolia of China(Grant No.2022MS05037). （资助号:52304142,52064042）
