温州大桥南岸挖方边坡滑坡加固治理与分析

温州大桥南岸挖方边坡滑坡位于该边坡的4~6级坡上,该边坡的浅部地层为全风化或强风化的凝灰岩,结构松散,强度低,下部为弱风化的白色凝灰岩,岩性比较完整;滑坡中心区域坡体厚度大,土层含水量高,周边滑体薄、含水量低。针对滑坡体的特征,选择了滑坡中心区域用预应力锚索及坡面锚索框架配合微型桩加固,周边用锚杆及坡面锚杆框架加固的整体支护方案。用给定滑动面的极限平衡法分析比较不同支护的效果,发现锚索框架增稳效果显著,整体支护方案能够满足暴雨条件下坡体浸水饱和时的稳定性要求。经过近半年的运行监测,加固后的滑坡体稳定。

Reinforcement and Analysis on Excavated Slope Sliding Located at South Bank of Wenzhou Bridge

A landslide is located at the 4～6 step of a excavated slope in the south bank of Wenzhou Bridge,entirely or strongly weathered tuff distributes in the shallow stratum of the slope,whose structure is loosen and intensity is lower,while there is weakly weathered tuff under the upper stratum of the slope,whose lithology is integrity.The thickness of the slide mass and the quantity of water is very large in the center of the landslide,while they are very lower around the center of the landslide.This article chooses a combined reinforcement project,namely,prestressed anchor cable and prestressed anchor cable frame along with micro anti-slipping piles are used to reinforce the slope in the center of the landslide,anchor pole and anchor pole frame are used to reinforce the slope around the center of the landslide.Then,through analyzing and comparing the effect of the kinds of reinforcement,it is found out that the prestressed anchor cable frame's effect is very large,and the combined reinforcement project can satisfy the stability of the slope when it is inundated and saturated.Through nearly semiannual inspecting,it is found out that the reinforced slope is stable.