季节性冻土区端帮条带式二次靠帮开采方法  

Strips Secondary Steep Mining Method for End-slope of Seasonally Frozen Soil Area

作　　者：佘长超 吴云飞 杨国宇 黄月军 石广洋 韩流[2] SHE Changchao;WU Yunfei;YANG Guoyu;HUANG Yuejun;SHI Guangyang;HAN Liu(Shenhua Beidian Shengli Energy Co.,Ltd.,Xilinhot 026000,China;School of Mines,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]神华北电胜利能源有限公司,内蒙古锡林浩特026000 [2]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤矿安全》2020年第11期101-105,共5页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2016YFC0501103);国家自然科学基金青年科学基金资助项目(51804298);国家自然科学基金面上资助项目(51774271)。

摘　　要：为了充分利用边坡临空面土体的季节性冻融强度差异以提高端帮残煤回收率,采用剪切面微观结构模型分析了冻土抗剪强度的提升机理,提出了在冻结期进行二次靠帮开采的2种条带式开采方法,设计了最佳条带宽度分析流程;对胜利西一号露天矿南端帮进行了实例研究。结果表明:南端帮非冻期和冻结期的稳定系数分别为1.06和1.14,可在冻结期进行二次靠帮开采,最佳条带宽度为60 m;二次靠帮开采实现了南端帮边坡角从30°提升到33°,回收端帮残煤17.15万t;季节性冻土区实施条带式二次靠帮开采,可以在保证边坡安全的同时进一步提高资源回采率。In order to make full use of the difference of seasonal freeze-thaw strength of the soil on the free face of the slope to improve the recovery rate of the coal under the end-slope,the mechanism of the improvement of the shear strength of the frozen soil is analyzed by using shear plane microstructure model.Two kinds of strips mining methods for the secondary steep mining in the freezing period are proposed,and the optimal strips width analysis flow is designed.A case study on the south end-slope of Western Shengli No.1 open-pit mine is carried out.The results show that the stability factors of the south end-slope in the non freezing period and freezing period are 1.06 and 1.14,respectively.The second steep mining can be carried out in the freezing period,and the optimal strips width is determined to be 60 m by analysis.The secondary steep mining realized that the south end-slope angle was raised from 30°to 33°and the end-slope residual coal was recovered by 171500 t.In the seasonal frozen soil area,the implementation of the strips secondary steep mining can ensure the safety of the slope and further improve the recovery rate of resources.

关 键 词：端帮稳定性 靠帮开采 季节性冻土 条带式开采 数值模拟 

分 类 号：TD824.5[矿业工程—煤矿开采]