素混凝土桩复合地基在路堤滑坡治理中的应用

素混凝土桩可承受较大竖向承载力,同时具有抗弯剪的特点,因此采用素混凝土桩进行复合地基处理,可同时解决整体稳定性及承载力问题。文中以贵州省某高速公路深厚软基填方路堤滑坡为工程背景,针对厚5~10.7 m的人工填土(成分为黑褐色煤系地层的粉砂质泥岩、炭质泥岩等,受水浸泡后形成深厚软基),采用“极限平衡法+FLAC^3D”组合计算法进行了计算分析,验算了治理后的边坡稳定性及整体沉降,认为“素混凝土桩+反压护道”的治理方案可行,且治理后边坡稳定性较好,变形、裂缝均在设计控制范围内。

Application of Plain Concrete Column Composite Foundations in Highway Embankment Slide Landslide Control

Plain concrete column has the characteristics of anti-shearing,anti-bending and vertical bearing capacity.So the plain concrete column composite foundations can solve the whole stability problem and the bearing capacity problem in the same time.A deep soft foundation embankment landslide is taken as the engineering background.For artificial fill with thickness of 5~10.7 m(This artificial fill is formed with silty mudstone and carbonaceous mudstone in the black-brown coal-bearing strata,which is soaked in water for long time),the combined calculation method of“limit equilibrium method and FLAC^3D”is used to calculate and analyze the stability and settlement of the highway embankment slide after treatment.It is concluded that the treatment scheme of“plain concrete pile+back pressure berm”is feasible,the slope stability is good after treatment,and the deformation andcracks are all within the design control range.