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为了研究动载荷作用下井巷的稳定性,基于波动冲击理论,利用FLAC~(3D)值模拟软件,对深井不同断面巷道在动载荷作用下的围岩位移场变化规律进行了数值仿真。结果表明:不同巷道断面形式对冲击荷载作用的响应程度存在显著差别,巷道顶板监测点的速度产生波动从大到小依次为矩形、直墙拱形和圆形断面巷道;巷道顶板均产生明显下沉,矩形断面巷道的下沉量最大,其次是直墙拱断面巷道,圆形断面巷道的下沉位移最小;对于巷道围岩垂直应力的分布范围,圆形断面巷道最小,矩形断面巷道最大,直墙拱断面巷道居中,并得到了现场监测结果验证。
In order to study the stability of the roadway under dynamic load, based on the theory of fluctuating shocks, the numerical simulation of surrounding rock displacement field under different dynamic loads is carried out by using FLAC 3D simulation software. The results show that there is a significant difference in the response of different roadway sections to impact load. The fluctuation of the speed at the roof monitoring point of the roadway is rectangular, straight-walled arched and circular cross-section roadway; the roof of the roadway is obviously The settlement of the roadway in the slender and rectangular section is the largest, followed by the straight-arched section roadway with the smallest subsidence displacement. For the vertical stress distribution range of the surrounding rock, the roadway is the smallest, the largest is the rectangular section, Straight-wall arch section tunnel center, and has been verified by on-site monitoring results.