近距离下煤层综采工作面侧向支承压力分布研究

Study on Lateral Support Pressure Distribution of Fully Mechanized Coal Mining Face in the Contiguous Lower Seams

为确定木瓜煤矿近距离下煤层综采工作面区段煤柱的合理宽度,基于矿山压力与岩层控制理论,建立了侧向岩层断裂的三角块结构力学模型,计算出基本顶沿工作面推进方向断裂长度和沿侧向断裂跨度均为11.9 m,三角块结构在煤体中的断裂位置为11.5 m;同时应用数值模拟的方法,建立采场三维力学模型,得出随采场推进巷道侧向支承压力峰值为20 MPa、应力集中系数最大为2.55、塑性区范围为10 m左右。经现场检验,区段煤柱的合理宽度为16～18 m时,回采巷道受综采工作面采动影响较小。

In order to determine a rational width of the sectional coal pillar in fully mechanized coal mining face in seam closed distance to below seam in Mugua Mine, based on the mine pressure and strata control theory, a mechanics model of a broken delta block structure in lateral strata was established. The cracking length of the main roof along the coal mining face forward direction and the lateral cracking span calculated was 11.9 m individually. The cracking location of the delta block structure in the coal seam was 11.5 m. Meanwhile the numerical simulation method was applied to establish a 3D mechanics model of the coal mining face. With the coal mining face moving for- ward, the lateral support pressure peak of the gateway was 20 MPa, the max stress concentrated was 2. 55 and the plastic zone was about 10 m. The site detection showed when the rational width of the sectional coal pillar was 16 ~ 18 m, the mining gateway would be less affected by the mining operations of the fully mechanized coal mining face.