采空区框架桥侧向土压力研究

Study on Lateral Earth Pressure of Frame Bridge in Goaf

为研究采空区框架桥侧墙所承受的侧向土压力随墙体高度及外摩擦角的变化规律,采用库伦土压力理论进行了理论分析,并得到结论:当框架桥位于压缩区时,侧墙土压力值在被动土压力和静止土压力间的某一值;当框架桥位于拉伸区时,其土压力值位于静止土压力和主动土压力之间。当侧墙外层比较平整时,其被动土压力较小,其主动土压力较大;当侧墙外层比较粗糙时,其被动土压力较大,其主动土压力也较小;静止压力大小不受影响。当侧墙较高,土压力较大,当侧墙较低,其土压力较小。

In order to study the variation of lateral earth pressure on the side wall of frame bridge in goaf with the height of the wall and the angle of external friction, the coulomb earth pressure theory is used to carry out the theoretical analysis, and the following conclusions are obtained when the frame bridge is located in the compression zone, the value of the earth pressure on the side wall is a certain value between the passive earth pressure and the static earth pressure, and when the frame bridge is in the tension zone, the value of the earth pressure is between the static earth pressure and the active earth pressure. When the outer layer of the side wall is relatively flat, the passive Earth pressure is smaller and the active earth pressure is larger;when the outer layer of the side wall is relatively rough,the passive earth pressure is larger and the active earth pressure is smaller;the static pressure is not affected. When the side wall is higher, the earth pressure is higher and when the side wall is lower, the earth pressure is lower.