摘要
以东风煤矿为工程背景,采用数值模拟方法对3^(#)煤、4^(#)煤的掘进过程进行模拟,揭示了上、下层采空区围岩的裂隙发育特征、位移及内力变化规律,结果表明:3^(#)煤、4^(#)煤采空区上覆围岩沉降最大值均位于采空区中心偏上山位置,偏移中心距离与煤层倾角有关;下层煤层开挖会引起上层煤围岩的二次垮落,且垮落下的岩体增加了下层采空区顶板的变形,4^(#)煤顶板为变形最大部位,煤层开采完成后,3^(#)煤、4^(#)煤的采区中部顶板、3^(#)煤采区的两端存在大范围塑性区,为岩体薄弱位置;地表靠近煤层上山开采部位出现局部隆起,隆起值随着开挖面的接近而增加。
The Dongfeng coal mine was considered for engineering the model. The characteristics of fracture development, displacement, and internal force change of surrounding rock in the upper and lower goaf were determined. The results revealed the following: the maximum settlement value of surrounding rock overlying the No.3 coal and No.4 coal mined-out areas is in the center of the minedout area, and the distance from the migration center is related to the dip angle of coal seam. The excavation of the lower coal seam causes secondary caving of the surrounding rock of the upper coal,and the caved rock increases the deformation of the roof of the lower goaf. Furthermore, the roof of No.4 coal exhibits the largest deformation. After coal seam mining, large plastic zones of weak rock mass were observed in the middle roof of No.3 and No.4 coal mining area and at both ends of No.3 coal mining area. Local uplift appeared on the surface near the coal seam, and the uplift value increases with the approach of the excavation face.
作者
刘波
LIU Bo(Shandong Zhengyuan Geological Resource Exploration Co.,Ltd.,Jinan 250000,China)
出处
《煤炭技术》
CAS
北大核心
2022年第3期87-93,共7页
Coal Technology
关键词
采空区
倾斜煤层
数值模拟
围岩变形
塑性区
goaf
inclined coal
numerical simulation
deformation of surrounding rock
plastic zone
