节理化顶板及其稳定性问题研究

A RESEARCH ON JOINTED ROOFS AND INDUCED STABILITY PROBLEMS

采场顶板被高倾角平行节理切割后容易形成所谓的节理梁(Voussoir beam)结构。这样一种结构是以压力拱形式来维持静力平衡的。当拱端产生的拱推力过大时。不但这种结构本身岩体有可能产生挤压破坏。而且会给相邻顶板施加一个很大的轴向水平荷载,使得相邻顶板岩体有可能产生突然破坏,形成灾害性地压。本文详细研究了节理岩梁的拱推力,定量分析了这种拱推力对相邻顶板稳定性的影响。

The roofs cut by joints at a big dipping angle in mines can easily take a shape of voussoir beams, which keeps their static equilibrium in a form of pressure arch. When the arch thrust in the ends of beam is too big, the beam itself may be destroried by squeezing, and furthermore, it can also exert a big horizontal thrust on the adjacent rock roofs, which make it possible for the roofs to be failure suddenly, resulting in disasterous ground pressure in mines.This paper has made a detailed research on arch thrust of voussoir beams and their stability, and fruthermore analysed quantitatively the influences of such a kind of thrust on the stability of rock roofs adjacent to the beams.