川东某城市道路滑坡分析与治理

Analysis and controlling of an urban road landslide in eastern Sichuan

抗滑桩是治理路堑滑坡常用的支挡结构形式。在滑坡较长,厚度较大,可能产生多级破裂面时,鉴于设置的抗滑桩悬臂段长度大,对应的桩体截面大、造价高,安全系数提高效果受限,常采取桩顶放坡方式减少其临空高度以达到安全与节省造价的目的,必要时还需增加预应力锚索框架梁与预应力锚索抗滑桩等措施。在川东某城市道路滑坡治理中,本文结合地勘岩土力学参数,采用传递系数法算出了滑坡剩余下滑力与安全系数,合理选择了适宜的支挡结构形式,并重点阐述了实施治理方案及各实施阶段的安全系数、位移与剪切应变等,为设计、施工与监测提供了技术依据。

Anti-sliding pile is a common retaining structure for controlling road cutting landslide. When the body of landslide is long, thick and may have multiple rupture surfaces, the anti-sliding pile with long cantilever must be set, which will result in large cross section of pile body, high cost and limited improvement of safety factor. Reducing the height of slope near the pile top is often taken to achieve the purpose of safety and cost saving. If necessary, prestressed anchor cable frame beam and prestressed anchor cable anti-sliding pile are added. In landslide controlling of an urban road in eastern Sichuan, appropriate retaining structure is reasonably selected according to the residual driving force and safety factor of landslide calculated by transfer coefficient method with relative parameters provided by geological prospecting units. The safety factor, displacement and shear strain of the controlling scheme in operation stage and construction stage is emphatically elaborated, providing technical basis for design documents, construction and deformation monitoring.