特厚煤层小煤柱沿空掘巷数值分析及应用

沿空掘巷开采技术成功的关键主要取决于采场覆岩稳定的时间和沿空掘巷的位置。采场采动岩体运动导致围岩应力重新分布，动态采场应力作用于围岩并使其状态发生灾变是发生矿山灾害的根本原因。特厚煤层分层综采巷道布置（包括内错、外错和垂直），合理确定煤柱尺寸、巷道支护方式和参数选择能够最大可能发挥围岩的自承能力，是提高巷道稳定的重要保证。在稳定的内应力场范围内布置小煤柱护巷，能够明显提高巷道围岩稳定状态，减少巷道维护费用。通过理论分析、数值模拟和现场实测等方法，对特厚煤层下分层沿空掘巷小煤柱不同巷道布置设计，通过煤柱的应力、应变和位移进行对比分析，确定特厚煤层下分层沿空掘巷合理的巷道位置和煤柱尺寸及上覆岩层防控技术，并得到工程验证是正确可靠的，从而为特厚煤层小煤柱开采技术提供了重要的科学依据。

Numerical analysis of thick coal seam small pillar along gob roadway and its application

Mining technology gob key to the success depends on a stable overlying strata gob of time and location. Mining stope surrounding rock stress redistribution exercise-induced dynamic stresses acting on the rock pit and make state disaster is the root cause of mine disaster occurred. Layered thick seam fully mechanized roadway layout (including internal fault, external fault and vertical), reasonably determine the coal pillar size, roadway methods and parameters to the greatest possible self-supporting ability to play rock, is to improve the stability of the important roadway guaranteed. Stable internal stress field in the range of small pillar supporting roadway layout, can significantly improve the surrounding rock stress state, greatly improving the recovery rate. Through theoretical analysis, numerical simulation and field measurement methods such as, for layering under thick seam gob roadway layout small pillar of different designs, through analyzing and comparing the stress and strain and displacement of pillars to determine the thick coal seam under the sub-layer along gob roadway reasonable position and pillar dimensions and overlying strata control techniques, and get engineering validation is accurate and reliable, Thus little thick seam mining technology provides an important scientific basis.