汤屯高速公路A匝道高边坡变形分析及应急治理

Analysis of Deformation in High Slope on Ramp A of Tangtun Expressway and Trouble-Shooting

汤屯高速公路A匝道高边坡为变质砂岩组成的顺层边坡,施工开挖到第2级中部时边坡后缘出现一弧形裂缝,变形破坏模式表现为滑移-弯曲变形。鉴于该工程的重要性,根据设计、科研单位的意见,在监测结果指导下,对边坡采用框架预应力锚索进行应急治理,边坡变形基本稳定后再施工抗滑桩。从方案实施效果上看,由于该应急措施的采取使得其后的抗滑桩施工较为顺利,应急处理方案是有效的。监测结果表明,治理措施效果较好,目前边坡已处于稳定状态。

Slope on ramp A of Tangtun Expressway is a bedding rock slope. During excavation in the middle of layer 2, there is an arc crack occurs at rear edge of the slope, the deformation and failure mode is shown as slide- bending deformation. For this project is important, according to suggestions by the designer and researching unit, under instruction by supervision results, frame prestress anchoring cable is used on slope for emergent treatment, anti - slide piles will be arranged after slope deformation stabilized. In view of result of this solution, it has meliorate downstream anti - slide pile construction, the emergent treatment solution is effective. The result of monitoring shows the effect of treatment is fine and the slope is now in stable status.