超大采高综采工作面煤壁片帮机理及多维防护措施研究  

Mechanism of coal wall spalling in super high fully mechanized face and its multi-dimensional protection measures

作　　者：张金虎 李明忠[1,2] 杨正凯 李提建[1,2] 许永祥[1,2] 曾明胜 辛家祥[1,2] ZHANG Jinhu;LI Mingzhong;YANG Zhengkai;LI Tijian;XU Yongxiang;ZENG Mingsheng;XIN Jiaxiang(Coal Mining Research Branch,China Coal Research Institute,Beijing 100013,China;Coal Mining Research Institute Co,Ltd of CCTEG,Beijing,100013,China;China Coal Research Institute,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院开采研究分院,北京100013 [2]中煤科工开采研究院有限公司,北京100013 [3]煤炭科学研究总院,北京100013

出　　处：《采矿与安全工程学报》2021年第3期487-495,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51704157);国家重点研发计划项目(2017YFC0804308);天地科技创新创业资金资助项目(2018-TD-ZD008,2019-TD-MS002)。

摘　　要：针对超大采高综采工作面煤壁稳定性差、易片帮的问题,以榆林地区超大采高综采实践为基础对超大采高综采矿压显现规律和煤壁片帮特征进行了分析,建立了煤壁稳定性"π"形力学模型,分析了煤壁稳定性的影响因素,并结合金鸡滩煤矿8 m超大采高综采提出了煤壁稳定性多维防控措施。研究结果表明:超大采高综采来压强度高、持续时间长,支架载荷与采高呈正相关;基于液压支架、顶板和煤壁"π"形力学模型提出了垂向、走向和倾向多个维度提高煤壁稳定性的针对性防护措施,即通过增强支架工作能力、增大护帮防护面积和护帮力、提升供液速度的多维防护措施。通过建立8m超大采高液压支架四连杆机构模型,完成了ZY21000/38/82D型超大采高强力液压支架骨架关键参数优化设计,实现了8 m超大采高工作面煤壁稳定可控,安全性大幅提高,在金鸡滩煤矿108工作面进行了工业性实验,工作面达到了日产6.16万t、月产153万t的生产水平。In view of poor coal wall stability and easy spalling in ultra-large mining height fully mechanized coal mining face, with ultra-large mining height fully mechanized mining practice in Yulin as engineering background, the mining pressure behavior and coal wall spalling characteristics in ultra-large mining height fully mechanized face were analyzed, the "π"-shaped mechanical model of coal wall stability was established, the influencing factors of coal wall stability were analyzed, and the multi-dimensional prevention and control measures for coal wall stability were proposed in combination with 8 m super-large mining height in Jinjitan coal mine. The results of the study have indicated that the super-large mining height has high intrusive pressure strength and long duration, and the support load is positively correlated with the mining height. Based on the hydraulic support, roof and coal wall "π"-shaped mechanical model, targeted prevention measures to improve the stability of coal walls were proposed at vertical, trend and tendencies dimensions: multi-dimensional protective measures of increasing the working capacity of the support, protective area and protective force, and liquid supply speed. Through the establishment of the four-bar linkage model of the 8 m super-large mining height hydraulic support, the key parameter optimization design of the ZY21000/38/82 D super-large mining height strong hydraulic support frame was completed, and the coal wall of the 8 m super-large mining face was stable and controllable, and the safety substantially improved, industrial experiments were carried out at working face 108 of Jinjitan Coalmine, and the working face reached a production level of 61,600 tons per day and 1.53 million tons per month.

关 键 词：超大采高 煤壁 稳定性 片帮 液压支架 

分 类 号：TD353[矿业工程—矿井建设]