摘要
在停采线位置预掘收作眼,可大幅度提高综放工作面搬迁速度。由于受到工作面前方移动支承压力和基本顶周期来压的持续影响,收作眼的维护比一般回采巷道更困难。基于综放末采期间矿压显现和覆岩运动规律,通过相似模拟实验研究覆岩结构失稳对工作面前方巷道变形与破坏的影响,从而得到最佳的收作眼位置;采用岩石破裂过程分析软件RFPA2D系统,对收作眼围岩稳定性进行了数值计算与分析,并对其支护设计方案进行了优选。研究成果应用于济三煤矿4303综放面,实现了采场与收作眼的安全对接和综放工作面的安全快速收尾,并根据井下实测数据,对收作眼的使用效果及其经济效益进行了评价。
The removal speed of the fully-mechanized coal face with topped caving (FCFTC) can be increased by pre-excavating finishing cut on terminal mining line. Because the finishing cut is continuously affected by the abutment pressure in front of the face, its maintenance is much more difficult than that of the ordinary coal entry. Based on the law of the ground pressure and the motion of overlying strata during the terminal mining in FCFTC, in order to avoid the influence of periodic roof pressure, the optimal position of finishing cut is determined by analogous simulation experiment. The stability of the surrounding rock masses of finishing cut is analyzed systemically and its support design is optimized by numerical simulation with RFPA2D. The application of the analysis results to 4303 FCFTC of Jisan Coal Mine shows that the finishing cut is safely jointed to coal face and the coal face finishes quickly. The effect of the finishing cut and its economic benefit are also evaluated.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第12期1981-1985,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点项目(50134040)
教育部博士点基金(20010290003)资助课题。
