抗滑桩支挡膨胀土边坡处治与施工工艺分析

Analysis of Treatment and Construction Technology of Expansive Soil Slope Supported by Anti-Slide Pile

以某高速公路养护工区土质边坡开挖过程中局部垮塌及防护处治过程为例,分析了抗滑桩支挡弱膨胀土边坡垮塌原因和机理,提出了该类边坡设计时应特别考虑防水保湿等影响因素,在边坡施工落实设计意图时,除落实边开挖边防护、分段开挖、跳槽开挖等边坡常规施工措施外,要重视膨胀土的超固结水平推力作用,必要时要采取先支挡后开挖的工艺措施,防止施工过程中的边坡垮塌和质量安全事故。

In this paper,the cause and mechanism of the collapse of the weak expansive soil slope supported by anti-slide piles are analyzed by taking the local collapse and protection treatment of the soil slope in a maintenance area of an expressway as an example,it is pointed out that the influence factors such as waterproof and moisture retention should be taken into account in the design of such slopes.When the design intention is implemented in the slope construction,in addition to the conventional construction measures such as side opening outer edge protection,subsection excavation,job hopping excavation,etc.,attention should be paid to the horizontal thrust effect of overconsolidation of expansive soil,and when necessary,technical measures should be taken to prevent slope collapse and quality safety accidents in the construction process.