马脊梁矿新建变电站场地下伏刀柱式采空区残余空隙率研究  

Residual void ratio of knife pillar mining goaf under a new substation site in Majiliang Mine

作　　者：周禹良 高晓耕 李生生 ZHOU Yuliang;GAO Xiaogeng;LI Shengsheng(Beijing China Coal Mine Engineering Co.,Ltd.,Beijing 100013,China;National Engineering Research Center of Deep Shaft Construction,Beijing 100013,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]北京中煤矿山工程有限公司,北京100013 [2]矿山深井建设技术国家工程研究中心,北京100013 [3]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《煤炭工程》2023年第3期139-144,共6页Coal Engineering

基　　金：国家自然科学基金资助项目(51874173);天地科技股份有限公司科技创新创业资金专项项目(2019-TD-QN010,2021-TD-QN004)。

摘　　要：采空区残余空隙率是采空区地基稳定性评价及充填注浆方案设计的重要技术参数,为了确定新建变电站场地下伏刀柱式采空区残余空隙率合理取值,采用离散元软件UDEC模拟了2#煤刀柱式采空区覆岩垮落特征,得到覆岩垮落高度为9.0 m。考虑冒落矸石碎胀效应,通过自定义fish函数得到采空区垮落范围内块体的残余体积,分析得到2#煤刀柱式采空区垮落带范围的残余空隙率为0.233。基于模拟得到的残余空隙率,预测得到变电站下伏采空区充填注浆量为25267 m3,预测结果与实际注入量的偏差仅为5.4%。结果表明模拟得到的空隙率能较好地表征采空区垮落范围残余空隙发育程度,可为采空区注浆充填治理提供技术参考。The residual void ratio of the goaf is an important technique parameter for stability evaluation of foundations above the goaf and the design of backfill grouting scheme.In order to determine the reasonable residual void ratio in the underground knife pillar goaf below the new substation,the UDEC discrete element simulation is used to analyze the collapse characteristics of the overburden for the 2#coal knife pillar goaf,and the simulated caving height is 9.0 m.Considering the bulking effect of caved gangue,the residual volume of the block within the caving range of the goaf is obtained using a self-defined fish function,and the average residual void ratio is 0.233 in the caving zone of the 2#coal knife pillar goaf.Based on the simulation results,the backfilling grouting volume of the goaf under the substation is predicted to be 25267 m3,and the deviation between the predicted result and the actual injection volume is only 5.4%.It can be concluded that the simulation results can represent residual void degree in the caving area of the knife pillar mining goaf,and this method can provide technical reference for backfill grouting in goaf treatment.

关 键 词：残余空隙率 采空区 碎胀效应 数值模拟 充填注浆 

分 类 号：TD327[矿业工程—矿井建设]