摘要
目的为探究松软煤层大采高工作面煤壁片帮机理,并对片帮严重的松软煤层大采高工作面煤壁进行有效控制,方法利用材料力学理论得到煤壁片帮的频发位置,引入煤壁剪切破坏准则,得出松软煤体煤壁片帮的主控因素。并以李村煤矿1305工作面为例,通过FLAC3D建立数值模型,以煤壁最大位移、煤体破坏深度、支承压力大小和支承压力峰值位置4个因素作为参考比较对象,通过引入正交试验法,研究了煤层埋深、内摩擦角、黏聚力、抗拉强度以及支护强度对煤壁片帮的影响程度。结果结果表明:煤体自身的物理力学性质(内摩擦角和黏聚力)是影响煤壁片帮的主要因素,其次煤体的赋存条件(埋深)也是一个较为关键的影响因素。结论工业性试验基于正交试验结果提出了大采高综采工作面深浅孔交替超前预注浆加固技术,有效控制了李村煤矿1305工作面煤壁片帮严重情况,为其他类似地质条件大采高综采工作面煤壁片帮控制提供了借鉴。
Objectives In order to explore the mechanism of coal wall spalling in large mining height workfaces of soft coal seams and effectively control serious rib spalling in the large mining height workface of soft coal seams.Methods Based on the theory of material mechanics,the frequent locations of rib spalling were obtained,and the criterion of coal wall shear failure was introduced to determine the main controlling factors of soft rib spalling.The 1305 mining face of Licun Coal Mine is taken as an example,and a numerical model is established through FLAC3D.The maximum displacement of the coal wall,the depth of coal failure,the magnitude of abutment pressure,and the position of peak abutment pressure are taken as parameters for comparison.Through the orthogonal test research method,the influence degree of coal seam burial depth,internal friction angle,cohesion,tensile strength and support strength on rib spalling is studied.Results The research results show that the physical and mechanical properties of coal(internal friction angle and cohesion)are the main factors affecting rib spalling,and the occurrence condition of coal(burial depth)is also a key factor.Based on the orthogonal test results,the paper proposes the technology of deep and shallow hole alternating advance pre-grouting reinforcement for the fully mechanized caving face with large mining height.Conclusions The technology effectively controls the serious situation of rib spalling in the 1305 mining face of Licun Coal Mine through fault tectonic belt,which could provide a reference for the control of rib spalling in other fully mechanized caving faces with large mining heights with similar geological conditions.
作者
陈晓祥
韩文宇
CHEN Xiaoxiang;HAN Wenyu(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454000,Henan,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2024年第3期11-22,共12页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(U1504515,51304068)
中国煤炭工业协会指导性研究计划项目(MTKJ2015-251)
河南省高等学校青年骨干教师培养计划项目(2017GGJS055)
河南高校基本科研业务费专项项目(NSFRF140134)。
关键词
大采高
松软煤层
煤壁片帮
正交试验
数值模拟
large mining height
soft coal seam
rib spalling
orthogonal test
numerical simulation
作者简介
第一作者:陈晓祥(1979-),男,江苏涟水人,博士,教授,主要从事巷道围岩控制与岩土特殊施工技术方面的教学和研究工作。Email:chenxxiang@163.com。
