古水水电站工程区域堆积体边坡工程地质分析

基于弹性有限变形理论和电弹性体偏场理论，对半无限压电体及其表面电极层间存在 穿透脱层的屈曲问题进行了分析. 采用平面应变模型，在脱层远处作用有平行于脱层的应变 载荷. 使用Fourier积分变换，应用脱层界面的连续条件和电极表面的边界条件将问题归为 第2类Cauchy型奇异积分方程组. 利用Gauss-Chebyshev积分公式将奇异积分方程组变为 齐次线性代数方程组，以确定临界应变载荷. 通过数值算例，给出了底层为PZT-4材料、 电极为金属Pt在不同的脱层长厚比时的临界应变载荷和屈曲形状，分析了压电体的压 电、介电效应对屈曲载荷的影响. 另外给出了脱层屈曲时，脱层尖端奇异性振荡因子随不同 脱层长厚比的关系曲线.

ENGINEERING GEOLOGY ANALYSIS OF COLLUVIAL |SLOPE AT HYDROPOWER STATION PROJECT IN GUSHUI

Stability  of slopes comprising colluvium  is very important to the hydropower station construction in the southeast of China especially. The key  tasks are to find the answers for the questions: the reasons of accumulation formation, mechanical parameter values and slope stability under different conditions. This paper  analyzes the typical engineering geology condition of the dam site zone  of a hydropower station at Gushui.  The lower  zone is slate and the upper is colluvium.   The paper examines the history of the  engineering geology condition  at this region.   It further examines the formation of the colluvium at the upper zone and  obtains the topping deformation of slate at the lower zone.  Due to schlep effect, the colluvium was formed.  The rock-soil materials on the top of slope move down in schlep effect of outwash.  The colluvium  has a clear layering structure.   The slate experiences a continuous increase in under the effect of tectonic movement, incised valley and weathering unloading and also the weight of upper colluvium. Breaking of the slate is happened and lead to topping deformation.  Based on the analysis of physical and mechanical characteristics of the colluvium,  and combined with the survey of engineering geology condition, the mechanism of failure and deformation of the colluvium slope is obtained.  Its contains the wholly slide failure along the weakly layer and the locally arc slide failure.