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昌赣公路膨胀土地段的高填深挖路基(±10米左右)施工后经雨水冲刷渗透,坡体发生大体积的泥流式坍塌,水沟被推移或推倒,路床翻浆,整个路基强度下降,并产生不均匀沉降路基严重毁坏。试验分析认为地表水是破坏膨胀土路基的主要因素。对此首先将1:0.5的坡比逐级改至1:2,甚至再放大坡比也难稳定边坡,不得不采取边坡防护措施:①拱型支撑因无法施工而未能实施;②采用网状干砌片石渗沟护坡,渗沟再用10cm厚的煤渣灰土
After the construction, the deep fill and deep excavation of expansive soil in Chang-Gan Highway (about ± 10 meters) will be infiltrated by rainwater. Large-scale mud-flow collapse occurs in the slope, the ditches are pushed or pushed down, the road bed is spurted, the entire subgrade strength Decline and produce uneven subsidence Roadbed serious damage. According to the experimental analysis, surface water is the main factor to destroy the expansive soil roadbed. Firstly, the slope ratio of 1: 0.5 is changed to 1: 2 step by step. Even if the slope ratio is enlarged again, it is hard to stabilize the slope. Therefore, the slope protection measures must be taken: (1) The arch support can not be implemented due to the failure of construction; The use of mesh dry masonry stone infiltration slope protection, seepage and then 10cm thick cinder lime soil