8.5m大采高综采工作面煤壁稳定性的理论分析  

Theoretical analysis on coal wall stability of fully mechanized 8.5m high cutting longwall mining face

作　　者：吴浩[1] 宋选民[1] 

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024

出　　处：《煤炭科学技术》2015年第3期22-25,共4页Coal Science and Technology

基　　金：山西省科技攻关资助项目(200631118-02)

摘　　要：大采高综采工作面片帮问题是影响高效安全开采的主要因素之一,为了研究大采高对煤壁稳定性的影响,基于上湾矿四盘区1-2煤层8.5 m大采高工作面围岩力学条件,采用压杆理论分析煤壁的挠度特征,得到煤壁容易发生片帮的位置在煤壁的中上部;并提出梯形滑块模型,在考虑摩擦力的前提下通过力学计算,得到护帮力不能小于0.251 MPa;针对8.5 m超大采高综采工作面,特别提出了采用支架增压增力复合护帮机构支护方式,护帮板长度分别为1 100、1 600、800 mm,总长度达3 500 mm,可以有效地减少工作面大块煤壁片帮现象。The spalling problems of a fullymechanized high mining face was one of the major factors affected to the high efficient and safe-ty mining. In order to study the high cutting mining affected to the stability of the coal mining wall,based on the surrounding rock mechan-ics conditions of the 8. 5 m high cutting mining face in No. 1-2Seam of No. 4 Mining Block in Shangwan Mine,a compressive bar theorywas applied to analyze the bending features of the coal wall and a location of the coal wall easy to cause spalling obtained was at the mid-dle-upper part of the coal wall. A ladder slide model was provided. In consideration of the friction force,with the mechanics calculation,a conclusion on the sidewall protection force no less than 0. 251 MPa was obtained. According to the 8. 5 m ultra highfullymechanized coal mining face,a support method with a pressure increased and force increased compound sidewall protection mechanismof the powered support was provided. The sidewall protection plate with a length of 1 100,1 600 and 800 mm individually and a total lengthof 3 500 mm could effectively reduce the large area spalling phenomenon occurred in the coal mining face.

关 键 词：大采高 煤壁片帮 压杆理论 塑性区深度 护帮力 

分 类 号：TD323[矿业工程—矿井建设]