弹脆性圆形煤巷应力跃升及冲击地压预测模型  

Stress jumping of elastic-brittle circular coal roadway and prediction model of rock burst

作　　者：王书文 鞠文君 张春会[3] 苏士杰 陆闯 WANG Shu-wen;JU Wen-jun;ZHANG Chun-hui;SU Shi-jie;LU Chuang(China National Coal Group Corporation,Beijing 100120,China;CCTEG Coal Mining Research Institute,Beijing 100014,China;Hebei Technological Innovation Center of Disaster Prevention and Mitigation Engineering of Geotechnical and Structural System,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Menkeqing Coal Mine,Zhongtian Hechuang Energy Co.,Ltd,Erdos,Inner Mongolia 017000,China)

机构地区：[1]中国中煤能源集团有限公司,北京100120 [2]中煤科工开采研究院有限公司,北京100014 [3]河北科技大学河北省岩土与结构体系防灾减灾技术创新中心,河北石家庄050018 [4]中天合创能源有限责任公司门克庆矿,内蒙古鄂尔多斯017000

出　　处：《岩土力学》2023年第3期873-883,895,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.51574139,No.51704155);河北省教育厅重点项目(No.ZD2020338)。

摘　　要：为预测煤巷冲击地压灾害,将强冲击倾向煤视作理想弹脆性材料,建立圆形煤巷力学模型,分析煤巷围岩的应力和变形能密度分布特征,进而建立煤巷冲击地压预测模型,利用该模型预测冲击地压灾害风险。研究结果表明:弹脆性煤巷围岩的切向应力和变形能密度在弹性区与破坏区界面处发生跃升;煤体强度损伤度和地应力增大,煤巷破坏区半径增大,煤巷围岩切向应力和变形能密度跃升高度增大;切向应力跃升为煤巷失稳破坏提供了力源,变形能密度跃升为冲击地压发生提供了能量源;切向应力和变形能密度跃升高度越大,煤巷越容易失稳和冲击;基于切向应力和变形能密度跃升,建立了煤巷冲击地压解析预测模型,预测结果与现场冲击地压实际情况一致,从而为脆性煤巷冲击地压预测提供了一种新的方法。In order to predict the rock burst disasters of coal roadway,the coal with bump tendency is regarded as a perfectly elastic-brittle material,and the mechanical model of circular coal roadway is established to analyze the distribution characteristics of stress and deformation energy density of surrounding rock of coal roadway,and then the rock burst prediction model of coal roadway is established to predict the rock burst disaster of coal roadway.The results show that the tangential stress and deformation energy density of the surrounding rock of elastic-brittle coal roadway jump at the interface between the elastic zone and the failure zone.The damage degree of the strength and in-situ stress of coal increase,and the radius of failure area also increases.As a result,the jump height of the tangential stress and deformation energy density of the surrounding rock of the coal roadway increases.The tangential stress jumping provides a force for the instability and failure of coal roadway,and the deformation energy density jumping provides an energy for the rock burst.The higher the tangential stress and deformation energy density jump,the easier the instability and rock burst of coal become.Based on the jumping of tangential stress and deformation energy density,the analytical prediction model of rock burst in coal roadway is established,and the prediction results are consistent with the actual situation of rock burst in the field,thus providing a new method for predicting rock burst in brittle coal roadway.

关 键 词：冲击地压 煤巷 预测模型 理想弹脆性 切向应力跃升 变形能密度跃升 

分 类 号：U451[建筑科学—桥梁与隧道工程]