摘要
边帮煤回采过程中边坡岩体会经历复杂的力学衍变过程,涉及原岩应力变化、变形破坏区扩展、边坡稳定性等问题;因此,选择合适的回采方向和有效的控制措施对于边帮煤回采边坡稳定性至关重要。提出采用顺坡和逆坡对边帮煤进行回采,在回采的基础上提出回填压脚和逆坡回采局部充填2种方案对边坡稳定性进行控制。研究结果表明:边帮煤回采边坡变形破坏及稳定性与回采方向有关,顺坡回采采场岩体破坏区发育强度和深度比逆坡回采弱,整体稳定性较好,逆坡回采边坡稳定性会发生衰减致使平盘存在剪切失稳现象,且回采工作面长度小于顺坡回采,因此顺坡优于逆坡回采;根据顺坡和逆坡2种回采方案边坡变形破坏区发育及稳定性状况提出回填压脚和逆坡回采局部充填方案对边坡稳定性进行控制,回填压脚可以改变边坡原有结构形态,使边坡内部岩体运移状况得到缓解,达到控制破坏区发育的目的,逆坡回采局部充填,可以对边坡内部变形破坏的岩体形成有效支撑,达到遏制破坏区扩展的效果,减缓边坡平盘因工作面回采所造成的破坏,直至达到控制边坡稳定性的效果。
In the process of side-wall coal mining, the rock mass of slope undergoes complex mechanical evolution, which involves the change of original rock stress, the extension of deformation failure zone, the stability of slope and so on. Therefore, it is very important to choose proper mining direction and effective control measures for the stability of side slope. In view of the above problems, we propose two schemes to control the stability of side slope, which is backfill pressure foot and partial backfill in reverse slope. The results show that the deformation, failure and stability of side-slope coal are related to the direction of mining,and the strength and depth of rock mass failure area are weaker than that of reverse-slope coal mining, and the overall stability is better, the stability of the mining slope in reverse slope will attenuate, resulting in the shear instability of the flat plate, and the length of the working face is smaller than that of the mining along slope, so the mining along slope is better than that in reverse slope according to the development and stability of the slope deformation and failure area of the two stoping schemes, the backfilling foot and the local backfilling scheme are proposed to control the slope stability, the backfilling foot can change the original structure shape of the slope, so that the movement of the rock mass inside the slope can be alleviated, and the development of the failure area can be controlled, it can effectively support the deformed rock mass inside the slope, restrain the extension of the failure area, slow down the failure caused by the working face, and finally control the stability of the slope.
作者
王文才
李俊鹏
王创业
陈世江
李仕璋
WANG Wencai;LI Junpeng;WANG Chuangye;CHEN Shijiang;LI Shizhang(Institute of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou O14010,China;Shandong Lubi Building Material Co.,Ltd.,Jinan271103,China)
出处
《煤矿安全》
CAS
北大核心
2022年第11期236-243,共8页
Safety in Coal Mines
基金
国家自然科学基金资助项目(52064043,51764044,51464036)
内蒙古自治区自然科学基金资助项目(2020MS05010)。
关键词
边帮煤
破坏区
顺坡
逆坡
回填压脚
局部充填
边坡稳定性
side coal
destruction zone
downhill
uphill
backfill presser foot
partial filling
slope stability
