管网渗流系统对含碎石粘性土边坡的稳定作用

坡脚开挖或坡面堆载时,含碎石粘性土边坡经常发生滑坡。此类滑坡的发生机理不仅与边坡力学条件的改变有关,还与水文地质条件的改变有关。在含碎石粘性土边坡中常常发育有地下水管网渗流系统,它对控制坡体地下水位上升有重要的作用,是保持边坡稳定的重要因素。当坡脚开挖或坡面堆载引起坡体局部破坏时,原有的地下水管网渗流系统可能遭到破坏,从而导致坡体地下水位明显上升而产生滑坡。通过滑坡地质调查和稳定性计算分析,揭示了管网渗流系统的发育特点及其对边坡稳定性的影响,并通过物理模型试验再现了地下水管网渗流系统的形成过程及其对边坡渗透性的作用。

STUDY ON THE STABILITY OF PEBBLY CLAY SLOPES WITH PIPE DRAINAGE SYSTEM

Landslides often develop in pebbly clay slopes as toe cutting or surface loading. The mechanism of this kind of landslide is concerned with the change of mechanical condition and with the change of hydro-geological condition. Groundwater pipe drainage system usually develops in pebbly clay slopes. It is important to restrict groundwater level from rising in a slope. Therefore,the pipe drainage system is an important factor to keep a pebbly clay slope from failure. When local failure of a slope takes place by cutting at slope toe or loading on slope surface,the pipe drainage system may be destroyed. As a result,the ground water level will rise obviously and a landslide may take place. The effect of pipe drainage system on slope stability is studied by investigation and calculation of a landslide,and a physical model is used to uncover the development of groundwater pipe drainage system.