高速公路膨胀土边坡整治

在膨胀土边坡整治设计中,由于膨胀土在稳定性计算分析时有不确定因素,因此整治设计需结合对膨胀土边坡失稳特点和规律的认识,再结合类似边坡失稳的分析研究,使其稳定性计算分析和整治设计有较强的针对性。在总结分析膨胀土特点和规律后,对3个具体的膨胀土边坡失稳原因进行分析,然后根据襄孝高速公路对膨胀土路堑边坡进行试验研究,对其采用削坡放缓、抗滑桩加固、锚杆加固、抗滑挡土墙加固四种整治方式,分别对其进行稳定性分析。在满足稳定性前提下,从经济和生态环保角度比较各自的优劣,在12 m高以内边坡,采用削坡放缓整治方式最为经济环保。

TREATMENT OF EXPANSIVE SOIL SLOPES BESIDE HIGHWAYS

For the uncertain factors of expansive soil,the characteristics and regularities of expansive soil slope should be known clearly before its design and treatment,so that the pertinent measures can be taken according to the similar slopes.Based on the tests of cutting slope,analyses of the expansive soil features and the reasons that the three expansive soil slopes fail,slope cutting method,anti-slide piles,anchors and retaining walls are adopted separately;and the stability analysis under the four conditions are also analyzed.On the premise that the slope is stable,the merits and disadvantages of these methods are judged separately from the views of economy and environmental protection.For slopes lower than 12 m,the cutting method should be adopted for reasons of economy and environment.In the procedure of detail design,the in-situ conditions,ecological aspects and the costs should also be considered.