库水位升降作用下桥梁岸坡稳定性分析

Stability analysis of bridge reservoir under reservoir water level fluctuation

以贵州省某公路望谟河大桥为实例,分析库水位升降作用桥梁岸坡稳定性的影响。本文利用GeoStudio软件中的Slope和Seep模块,结合桥梁现场勘察及拟建水库运营等资料,分析库水位升降作用下的桥梁岸坡稳定性的变化规律。研究结果显示:库水位升降与岩土体的物理力学性质共同影响桥梁岸坡的稳定性;库水位下降过程中,岸坡稳定性系数降低,对岸坡稳定性不利,库水位上升过程中,岸坡稳定性系数增大,短时间内利于岸坡稳定,但在水库运营周期内,桥梁建设将考虑库水位升降影响。

Taking the WangMo River Bridge in a highway of Guizhou province as the example,analyzed the influence of the reservoir water level on the slope stability.In this paper,the slope and seep modules in GeoStudio software are used,combined with the site survey of the bridge and the operation of the proposed reservoir,to analyze the change law of the stability of the slope under the action of the reservoir water level fluctuation.The results of the study show that the fluctuation of the reservoir water level and the physical and mechanical properties of the rock and soil affect the stability of the bridge slope.During the decline of the reservoir water level,the stability coefficient of the bank slope decreases,which is not good for the stability of the shore slope.During the rise of the reservoir water level,the stability coefficient of the shore slope increases,which is beneficial to the stability of the shore slope in a short time,but during the operation period of the reservoir,the bridge construction will consider the impact of the reservoir water level fluctuation.