摘要
针对巨厚煤层全煤巷道围岩体的物理力学性质差、赋存条件复杂、大变形、支护难等问题,采用数值差分软件FLAC3D,系统分析了巨厚煤层全煤巷道开挖后围岩体的三维运移演化规律及不同赋存条件对演化规律的影响。研究发现:开挖对巨厚煤层全煤巷道围岩及掘进面前方一定范围内都有扰动影响,且在巷道围岩深部三维方向上均存在应力集中区;得出巷道围岩在不同赋存条件下呈现底板位移量>顶板位移量>帮部位移量的运移规律及塑性区扩展范围和分布状态的演化规律,为巨厚煤层全煤巷道的支护和开采提供了理论依据和技术支持。
Considering the poor physical and mechanical properties of the surrounding rock mass of full coal roadway in extremely thick coal seam, the complicated occurrence conditions, large deformation, and difficult support, the numerical difference software FLAC^3D was used to analyze the three-dimensional migration evolution of surrounding rock after the full coal roadway were excavated and the influence of different occurrence conditions on the evolution law. Through the analysis, it is found that the excavation has disturbance effects on both the surrounding rock of the full coal roadway in extremely thick coal seam and its front side within a certain range of excavation,and that there exist stress concentration in all three dimensions of the roadway surrounding rock at the depth. It is concluded that the migration of roadway surrounding rock under different occurrence conditions follows the rule of the floor displacement〉the roof displacement 〉the side displacement. Besides, the evolution law of the plastic zone extended range and its distribution are also obtained. All these provides the theoretical guidance and technical support for the mining and supporting of the full coal roadway in extremely thick coal seam.
出处
《山东科技大学学报(自然科学版)》
CAS
2015年第6期68-72,共5页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(51174128
51474135)
关键词
全煤巷道
FLAC^3D
运移演化
巨厚煤层
围岩体
full coal roadway
FLAC^3D
migration evolution
extremely thick coal seam
surrounding rock