傍山高陡填方软土路基的处治设计
TREATMENT DESIGN OF THE MOUNTAINSIDE HIGH STEEP FILL SOFT SOIL SUBGRADE
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摘要: 宁台温高速公路瑞安龙头至苍南分水关段第九合同段第2号工点是一傍山高陡填方软土路基。该工点地质条件特殊,半幅路基位于有一定斜坡的地质条件较好的山坡上,而另半幅路基位于海相沉积的水田内,上部有3.2m～7.2m的淤泥层,淤泥层底部横坡较大;边坡处最大填方高度约20m,存在横向滑动的趋势及不均匀沉降。为了解决路基的稳定及沉降问题,在该处路基设计中采用了锚索抗滑桩、反压护道及排水、分层铺设土工格栅等方法进行综合处治,通过近2年多的监测,傍山高陡软土路基的水平位移速率已经稳定,沉降也逐渐缓和。通车2 a多时间内,经受了多次台风暴雨袭击,路基一直处于稳定状态,充分说明本工点处理方案是成功的,达到了安全、稳定的目的。Abstract: The author in this paper introduces the treatment design of the mountainside high steep soft soil subgrade of No.2 worksit of No.9 contract section of Ruian Longtou-Cangnan Shuiguan in Ning-Tai-Wen express highway.This geology condition of this worksite is special,half of the subgrade Is located on a slope hillside with better geology condition;and the other half is located in the paddy field with mainre deposit,the thickness of the silt seam is 3.2～7.2m.
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