考虑长期稳定性的深井采区上山保护煤柱合理留设  

Reasonable design of coal barrier pillar of roadway in deep mining considering long-term stability

作　　者：杨永杰 段会强 刘传孝[2] 郝以瑞 

机构地区：[1]山东科技大学矿业与安全工程学院,矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [2]山东农业大学水利土木工程学院,山东泰安271018 [3]西山煤电(集团)有限责任公司马兰煤矿,山西太原030205

出　　处：《采矿与安全工程学报》2017年第5期921-927,932,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51379116,51574156);山东省自然科学基金重点项目(ZR2013EEZ001)

摘　　要：采区上山保护煤柱的长期稳定性对矿井安全生产具有重要影响,针对孔庄煤矿典型深部开采中IV1采区上山保护煤柱的蠕变变形及长期稳定性问题,采用现场实测、蠕变试验及数值模拟相结合的方法开展研究。现场实测表明,7433工作面超前支承压力明显影响范围为73 m。基于蠕变试验结果,采用改进的Burgers模型回归求得煤样蠕变参数,在此基础上,对煤柱的蠕变特性及长期稳定性进行了数值模拟计算。结果表明,当煤柱宽度大于85 m时,再增加煤柱宽度,其趋于稳定的时间及蠕变变形量相差不大,当煤柱宽度小于85 m时,随着煤柱宽度减小,煤柱趋于稳定的时间越来越长,变形量也逐渐增大。考虑深井煤柱的长期稳定性,IV1采区上山保护煤柱的合理宽度不应小于85 m。矿压监测结果表明,监测期内上山保护煤柱处于较好的稳定状态。The long-term stability of barrier coal pillar of roadway in deep mining has important influ- ence on a coal mine＇s safety production. In order to study on the creep deformation and long-term sta- bility of barrier coal pillar of IV1 deep mining section in Kongzhuang Coal Mine, the field measurement, the creep test, and the numerical simulation are all performed together. Through the field measurement, the influencing range of front abutment pressure of 7433 coal face is determined to be 73 m. Based on the results of creep test, the parameters of creep model are attained through the linear regression by the improved Burgers model, and then the creep characteristics and the long-term stability of coal pillar are analyzed by the FLAC30 numerical simulation. When the coal pillar width is equal to or greater than 85m, the stable time and creep deformation of coal pillar basically keep same. When the width is less than 85 m, its stable time could be long with decreasing coal pillar width. The surrounding rock deformation of rise protection coal pillar also become large and large. Considering the long-term stability of coal pil- lar in IV1 mining section, its reasonable to determine the pillar width shouldn＇t be less than 85 m. The field mine pressure monitoring results show that the coal pillar is in an good state.

关 键 词：深井 采区上山 煤柱 蠕变试验 长期稳定性 

分 类 号：TD32[矿业工程—矿井建设]