摘要
针对塔拉壕煤矿2102辅运输巷掘进期间曾发生冒顶事故,为了保证弱黏结顶板巷道支护安全可靠,通过计算机数值模拟研究了主应力偏转方向为0°、15°、30°、45°、60°、75°及90°时,弱黏结顶板巷道围岩塑性区的分布特征,揭示了巷道围岩的破坏规律,当主应力偏转方向为30°和45°时,顶板围岩塑性区尺寸最大,破坏深度达3.9 m,帮部围岩塑性破坏程度较小,塑性区尺寸为0.5 m。重点对顶板进行支护,根据悬吊理论计算,提出了防冒顶的锚杆索支护参数。结果表明,顶板位移量很小,为5～12 mm,离层主要发生在0～2 m层位,占65%以上,巷道几乎不发生变形,没出现冒顶事故,基本能够保持稳定。
According to the roof failing accident occmTed in the heading period of No. 2102 auxiliary transportation roadway in Talahao Mine, in order to ensure the support safety and reliability of the mine roadway with the weak binding roof, the computer numerical simula- tion was applied to study the distribution features of the plastic zone in the mine roadway with the weak binding roof when the main stress direction was at 0°, 15°, 30°, 45°, 60°, 75° and 90°.The paper revealed the surrounding rock failure law of the mine roadway. When the main stress deflecting direction was 30° and 45°, the plastic zone in the surrounding rock of the roof would be max in size, the failure depth would be 3.9 re,the plastic failure of the surrounding rock in the sidewall would be small and the size of the plastic zone was 0.5 re.The key support was the roof support.According to the suspension theory, the bolt and anchor support parameters to prevent the roof falling were provided.The results showed that the roof displacement was small and was 5- 12 ram.The bed separation was mainly occurred in 0-2 nl strata level and would be taken over 65%.There was no deformation occurred in the mine roadway and no roof failing accident occurred.The stability of the mine roadway was basically kept.
出处
《煤炭科学技术》
CAS
北大核心
2016年第7期158-163,195,共7页
Coal Science and Technology
基金
国家自然科学基金资助项目(51134018)
关键词
弱黏结顶板
主应力方向
围岩破坏规律
支护对策
weak binding roof
main stress direction
failure law of surrounding rock
support countermeasures
