Shandong Hengchi Mining Industry Equipment Science and Technology Co., Ltd.

工作面的遗留煤柱在回采过程中回收困难,会造成地下煤炭资源的大量浪费。针对张集煤矿煤柱资源浪费问题,本文通过数值模拟的手段对张集煤矿综放工作面两次回采过程中围岩的应力分布规律进行了分析,提出了综放巷内矸石膏体充填无煤柱开采技术,改进了现场工程中的巷道支护方案,验证了无煤柱开采技术的可行性和安全性。结果表明:上工作面回采期间,作用于实体煤上顶板的应力峰值稍大于充填体上的顶板;下工作面回采时,在超前10~20m范围,实体煤帮下所受应力最大值将超过充填体处,而在20m范围外,实体煤帮下所受应力最大值会低于充填体处,实现了无煤柱开采,为解决煤柱的遗留问题提供了技术基础。

It is difficult to recover the remaining coal pillars of the working face during the stoping process, which will result in a large amount of waste of underground coal resources. In view of the problem of waste of coal pillar resources in Zhangji Coal Mine, this article analyzes the stress distribution law of the surrounding rock during the two stoping processes of Zhangji Coal Mine's fully mechanized caving face through the mean of numerical simulation, proposes the non coal pillar mining technology of gangue gypsum body filling in the fully mechanized caving roadway, improves the roadway support scheme in the on-site engineering, and verifies the feasibility and safety of the technology of non coal pillar mining. The results show that during the stoping process of the upper working face, the stress peak acting on the roof of the solid coal is slightly greater than that on the roof of the filling body; during the stoping of the lower working face, within a range of 10-20 m advance, the stress maximum value under the solid coal side will exceed that at the filling body, while outside the range of 20 m, the stress maximum value under the solid coal side will be lower than that at the filling body, achieving non coal pillar mining and providing a technical basis for solving the remaining problem of coal pillars.