摘要
破碎围岩受开采扰动容易引发围岩变形破坏,是矿山深部开采面临的重要支护难题。以阿尔哈达矿368 m中段27~35线破碎巷道为工程背景,基于Kastner公式确定破碎巷道围岩特征曲线,开展围岩—支护相互作用关系研究,以围岩—支护特征曲线交点作为围岩支护结构设计依据,探究合理支护时机。研究发现,支护结构设置时间对围岩应力释放、围岩—支护特征曲线交点位置均有一定程度的影响;随着支护断面与开挖面距离的逐渐增大,安全系数增长速率呈现先增大后减小的变化趋势;支护结构能够有效抑制围岩应力释放和围岩变形,促使围岩应力和支护抗力迅速达到平衡;对于该矿山破碎巷道围岩采用柔性支护方案,在围岩应力释放到一定程度后,施加支护的时机以支护断面距离开挖面4 m为最佳。
The broken surrounding rock is easily deformed and damaged by mining disturbance,which is an important support problem faced by deep mining. Taking the broken roadway of line 27 ~ 35 in the 368 m middle section of A′erhada Mine as the engineering background,the surrounding rock characteristic curve of the broken roadway is determined based on the Kastner formula,the interaction relationship between surrounding rock and support is studied,and the intersection of surrounding rock support characteristic curve is used as the basis for the design of surrounding rock support structure to explore the reasonable support opportunity. It is found that the setting time of support structure has a certain influence on the stress release of surrounding rock and the intersection position of surrounding rock support characteristic curve;With the gradual increase of the distance between the support section and the excavation surface,the growth rate of safety factor increases first and then decreases;The support structure can effectively restrain the stress release and deformation of surrounding rock,and promote the rapid balance between surrounding rock stress and support resistance;For the surrounding rock of the broken roadway of the mine,the flexible support scheme is adopted. After the surrounding rock stress is released to a certain extent,the best time to apply support is that the support section is 4 m away from the excavation face.
作者
周亚博
张杰
刘也
郭奇峰
柏杨
董建伟
ZHOU Yabo;ZHANG Jie;LIU Ye;GUO Qifeng;BAI Yang;DONG Jianwei(Xilin Gol Shangdong Gold Group Aerhada Minerals Co.,Ltd.,Xilin Gol 026000,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属矿山》
CAS
北大核心
2022年第6期17-23,共7页
Metal Mine
关键词
深部开采
破碎巷道
特征曲线
支护结构
支护时机
deep mining
broken roadway
characteristic curve
supporting structure
support opportunity
