组合式支挡防护在滑坡处治中的应用

The Application of Combined Retaining Structure Protection in the Prevention of Engineering—triggered Landslide

组合式支挡结构因设置灵活、适用范围广、经济性较好等特点,广泛应用在滑坡处治工程中。本文以仁沐新高速公路一小型浅层牵引式滑坡工点作为研究对象,根据边坡下滑力与抗滑力的极限平衡关系,反算出岩土界面的综合参数值,采用瑞典条分法进行了边坡稳定性分析,并计算出拟设支挡处的剩余下滑力,提出桩板墙与抗滑挡土墙分段处治滑坡的组合方案,经验算,该组合支挡结构的桩顶位移、抗滑移稳定系数、抗倾覆稳定系数均满足设计规范要求,且较传统全部采用桩板墙的防护方案节约投资约120万元,有较好的经济性。在试运营期间,桩顶中心点连续水平位移监测累计位移为22mm,说明该组合式支挡防护结构在本次滑坡处治中达到了预期效果,为同类型滑坡处治提供借鉴。

Composite retaining structures have been widely used in landslide treatment projects due to their flexible settings,wide applicability,and economic efficiency.This article takes a small shallow retrogressive slide on the Renmuxin Expressway as the research object.Based on the limit equilibrium relationship between the sliding force and anti sliding force of the slope,the comprehensive parameter values of the geotechnical interface are calculated in reverse.The Swedish Method was used for slope stability analysis,and the residual sliding force at the proposed support was calculated.A combination scheme of pile sheet wall and anti-slide retaining wall was proposed for segmented treatment of landslides.Through verification,the displacement of pile top,anti slip stability coefficient,and anti overturning stability coefficient of the combined retaining structure meet the requirements of the design specifications,and are more cost-effective than the traditional protection scheme that uses only pile sheet walls?saving about 1.2 million yuan in investment.During the trial operation,the cumulative displacement of the continuous horizontal displacement monitoring at the center point of the pile top was 22mm,indicating that the combined support and protection structure achieved the expected effect in this landslide treatment,which can provide some reference for the treatment of similar landslides.