论文部分内容阅读
一、整体地层中水平坑道支撑上的地层压力水平坑道支撑上的地层压力有頂部压力、两側压力、和底部压力。其基本形式是顶部压力。坑道的頂部压力水平坑道支撑上的地层压力大小,存在着几种假定。 M.M普魯托季雅可夫教授对地层压力的假定,根据这种假定,支撑頂部的地层压力被解释成坑道上面形成自然平衡拱,这个拱具有抛物綫的形式,压力的大小等于这个拱內的地层重量。每米坑道頂部对支撑的地层压力,按下式确定: P=4/3 abr (1)而对每排支撑的压力为: P=4/3 abrl (2)式中: u——坑道跨度之半(米); b——自然平衡拱的高度,当坑道使用期不长
First, the overall formation of the level of pressure on the level of tunnel support formation pressure on the tunnel support top pressure, pressure on both sides, and the bottom of the pressure. The basic form is the top pressure. There are several assumptions about the pressure at the top of a tunnel, the amount of formation pressure on a tunnel support. According to the assumption made by Prof. Plutotyakov on the formation pressure, the formation pressure at the top of the support is interpreted as forming a naturally balanced arch above the tunnel with a parabolic form with a pressure equal to this arch Of the formation weight. The formation pressure on the top of each tunnel is determined as follows: P = 4/3 abr (1) and the pressure for each row of struts is: P = 4/3 abrl (2) where: u - pit span Half (m); b - natural balance arch height, when the tunnel is not long life