废弃矿井遗留煤柱-人工坝黏结体失稳特征试验研究  

Experimental study on instability characteristics of coal pillar-artificial dam bond in abandoned mine

作　　者：杨科[1,2] 吕鑫 刘钦节[1,2] 杨彦群 池小楼[1,2] 方珏静 付强 王于[1,2] 张寨男 YANG Ke;LYU Xin;LIU Qinjie;YANG Yanqun;CHI Xiaolou;FANG Juejing;FU Qiang;WANG Yu;ZHANG Zhainan(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education,Anhui University of Science and Technology,Huainan,Anhui2i32001,China;Shanxi Coking Coal Group Co Ltd,Taiyuan,Shanxi 030024,China)

机构地区：[1]安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [3]山西焦煤集团有限责任公司,山西太原030024

出　　处：《采矿与安全工程学报》2022年第6期1071-1083,共13页Journal of Mining & Safety Engineering

基　　金：中国工程院院地合作项目(2020SX5);山西省揭榜招标资助项目(20191101016);山西省重点科研项目(57820191101016);安徽省高校科学研究项目(YJS20210391)。

摘　　要：煤柱-人工坝构建对利用关闭/废弃矿井地下空间储水至关重要,保证煤柱-人工坝黏结体结构稳定性是保障关闭/废弃矿井地下空间储水安全有效的基础。基于煤柱-人工坝黏结体受力状态分析,考虑三因素三梯度的黏结变量,制备29组不同黏结结构煤柱-人工坝类煤岩试件,开展无侧压单轴压缩试验;并基于煤柱-人工坝黏结体强度、应变变化、能量演化规律与宏观破坏特征,分析煤柱-人工坝黏结体角度、宽度、深度参数对试件性能与失稳模式的影响。研究结果表明:煤柱-人工坝黏结体受力状态根据黏结紧密性可分为分体承载、分担承载和协同承载,且分别对应3种本构模型;煤柱-人工坝黏结体各组试件单轴压缩破坏过程中存在典型全应力-应变曲线各阶段特征,以角度参数划分的3条强度曲线均呈现出“V-v-V”型结构;将轴向应变以角度参数绘制曲线时,曲线趋势复杂,在30mm宽度时呈现为先减小后增加的趋势,35mm宽度时则表现为持续减小,而40mm宽度时表现出持续上升的趋势;试件能量变化与应力-应变曲线各阶段相对应,同时敏感性分析表明深度参数是试件强度的主控因素,而角度的改变引起的轴向应变变化最为明显,最优参数组合为70-30-7.5;根据黏结体试件破坏形态分析结果,煤柱-人工坝黏结体试件可分为分散双劈裂失稳、联合单劈裂失稳和承载双柱状失稳3种模式。The construction of coal pillar-artificial dam is very important to the utilization of closed/abandoned mine underground space for water storage. Ensuring the structural stability of the coal pillarartificial dam bond is the basis to guarantee the safe and effective water storage of closed/abandoned mine underground space. Based on the stress analysis of the coal pillar-artificial dam bond and considering the bonding variables of three factors and three gradients, 29 sets of coal pillar-artificial dam coal and rock specimens with different bonding structures were prepared for uniaxial compression tests. Based on the coal pillar-artificial dam bond strength,strain change,energy evolution law and macroscopic failure characteristics,the influences of the coal pillar-artificial dam bond angle,width,depth parameters were analyzed on the specimen performance and instability mode. The results show that the stress state of the coal pillar-artificial dam bond can be divided into separate bearing,shared bearing and coordinated bearing according to the tightness of the bond,which respectively correspond to three constitutive models. During the failure process of coal pillar-artificial dam bond specimens under uniaxial compression,there are typical full stress-strain curve characteristics at each stage. All of the three strength curves divided by angle parameters present a“VvV”type structure. When the axial strain is plotted as the function of angle parameter,the curve trend is complex. When the width is 30mm,it first decreases and then increases. When the width is 35mm,it shows a continuous decrease. When the width is 40mm,it shows a continuous upward trend. The energy change of the specimen is similar to the stress-strain curve at each stage. Accordingly,the sensitivity analysis shows that the depth parameter is the main controlling factor of the strength of the specimen,while the axial strain change caused by the angle change is the most obvious,and the optimal parameter combination is 70-30-7.5. According to the fail

关 键 词：关闭/废弃矿井 煤柱-人工坝 地下水库 黏结组合体 失稳模式 

分 类 号：TU452[建筑科学—岩土工程]