摘要
为了准确而有效的掌握条带开采上覆岩层移动机理,采用FLAC3D数值模拟软件,对辽宁省灯塔市西马煤矿北二采区西上岗子村下压12煤采空区上覆岩层变形传播机理进行研究。模拟研究表明,采用FLAC3D软件可以较好地模拟条带开采上覆岩层长期变形特征。通过对各采空区和煤柱顶板及对应地表布设位移测点,得到顶板和地表不同时间段的竖向位移变化曲线。研究结果经分析得到,煤层开采后采空区顶板在自重和上覆岩层作用下,短时间内变形状态仍有较大变化;开采后21个月,各采空区顶板沉降变形开始趋于稳定;24个月后各煤柱顶板沉降变形开始趋于稳定;27个月后地表沉降变形开始趋于稳定;最终,采空区上覆岩层应力分布重新达到平衡。
In order to accurately and effectively control mechanism of overlying strata movement with strip mining. Using the FLAC3D to simulate the mechanism of goaf overburden deformation propagation of NO. 12 seam, which is located in NO. 2 mining area of the North of Xima Coal under the Xi Shanggangzi in Dengta, Liaoning. Simulation studies show that long-term characteristics of overburden deformation with strip mining can be simulated well by FLAC3D. By layouting displacement measuring points in the roofs of goafs and in the roofs of coal pillars as well as their own points on the surface, the vertical displacement curves of roofs and surface with different time can be obtained. The results of the research analysis is found that the deformation state changes seriously within a short time with the effect of their own gravity and overlying strata after mining. After mining, there are 21 months for the settlement deformation of goaf roofs beginning to tend stable, and 24 months for the settlement deformation of coal pillar＇ s roofs beginning to tend stable. After 27 months, surface subsidence begins to tend stable ;finally, stress distribution of goaf overburden reaches a new equilibrium. So it regains a steady state from the mining area to the surface.
出处
《中国地质灾害与防治学报》
CSCD
2017年第1期96-101,共6页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金(51274111)
辽宁省博士后集聚工程项目(2011921029)
关键词
覆岩移动
数值模拟
变形特征
位移测点
应力平衡
overburden movement
numerical simulation
deformation behaviour
displacement measuring point
stress balance
