摘要
井工煤岩巷道开掘中常遇地下含水岩层,由于含水煤岩体削弱自身承载强度,导致巷道存在安全隐患。针对含水岩层条件下的巷道围岩稳定性问题,本文结合李家塔煤矿2煤组辅运大巷遇含水岩层条件,通过数值模拟对比含水岩层条件下与无水条件下的巷道围岩受力破坏特征,进而分析含水岩层条件下巷道围岩支护控制方案。分析得出,含水岩层条件对巷道围岩应力集中峰值大小的影响无明显差异,但二者所导致围岩应力破坏深度显著增加;含水岩层条件下锚杆支护效果有限,不宜过度增加锚杆支护密度,应当侧重采取以锚索悬吊支护为主,并重视锚索悬吊锚固系统的承载稳定。“高预应力高强锚杆+锚索协调支护+混凝体喷浆”的联合支护方案能够对含水岩层条件下巷道围岩起到支护稳定控制作用。
Mining in roadway often encounters underground water-bearing rock strata,due to water-bearing coal rock body weakens their own load-bearing strength,resulting in roadway safety hazards.In order to address the stability of the water-bearing rock layer conditions of the roadway perimeter,this paper combined with the Lijata Mine No.2 coal seam auxiliary transportation with water-bearing rock layer conditions,through numerical simulation and comparison of water-bearing rock layer conditions and waterless conditions of the roadway perimeter force damage characteristics,and then the water-bearing rock layer conditions of the roadway perimeter rock support control program was analyzed.The analysis showed that the water-bearing rock layer conditions on the roadway perimeter stress concentration peak size of the impact without significant difference,but the two led to a significant increase in the depth of stress damage to the perimeter;water-bearing rock layer conditions under the anchor support effect was limited,should not increase the anchor support density excessively,should focus on taking the anchor suspension support given priority to,and pay attention to the anchor suspension anchoring system load stability;The joint support scheme of"prestressing high-strength anchor+anchor cable coordinated support+concrete spraying"can play a supporting and stabilizing role in controlling the perimeter rock of the roadway under water-bearing rock layer conditions.
作者
党鸿建
段军
Dang Hongjian;Duan Jun(Inner Mongolia University of Science and Technology,Inner Mongolia Baotou 014010,China;Inner Mongolia Lijiata Mine,Erdos 017209,China)
出处
《煤炭与化工》
CAS
2020年第9期29-32,46,共5页
Coal and Chemical Industry
关键词
辅运大巷
含水岩层
围岩强度弱化
巷道支护
auxiliary transportation roadway
water-bearing rock stratum
weakening of the surrounding rock strength
roadway support
