基于FLAC^(3D)的导水裂隙带发育高度模拟研究

Simulation Study on the Development Height of Water-conducting Fracture Zone based on FLAC^(3D)

明确导水裂隙带发育高度是防治突水事故、保障矿井安全的前提。为深入理解山西省某矿导水裂隙带高度的发育特征,文章研究采用FLAC^(3D)数值模拟软件模拟工作面推进至不同位置时,导水裂隙带发育高度的特征。结果表明:当工作面推进时,覆岩破坏共分为增长、缓增、稳定3个阶段,塑性区发育高度在工作面推进300 m时稳定至80 m,工作面继续推进覆性破坏仅在横向范围上扩展,纵向高度发育稳定,上层岩石的拉伸效应显著,整体呈现出对称的“马鞍形”特征。数值模拟结果与基于《规范》的理论计算结果具有良好的一致性,一定程度上验证了计算结果的可靠性。

It is the basic premise of preventing water inrush accident and ensuring mine safety to make clear the development height of water-conducting fracture zone.In order to further understand the development characteristics of the height of water-conducting fracture zone in a mine in Shanxi Province,numerical simulation software FLAC^(3D)was used in this paper to simulate the characteristics of the development height of water-conducting fracture zone when the working face was advanced to different positions.The results show that the overlying rock failure can be divided into three stages:growth,slow increase and stability.The development height of plastic zone is stable to 80 m when the working face advances 300 m.The overlying rock failure only expands in the lateral range while the longitudinal height is stable.The numerical simulation results are in good agreement with the theoretical calculation results based on the Specification,which verifies the reliability of the calculation results to a certain extent.