Research Institute of Mining Technology, Taiyuan University of Technology

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.1-2 Seam 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 calculati on,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 metho d 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.

山西省科技攻关资助项目(200631118-02)；