衡阳某红黏土滑坡抗滑桩施工难点及优化研究

Construction Difficulties and Design Optimization for Anti-slide Pile in Treatment of Red Clay Landslide in Hengyang

以衡阳地区某红黏土滑坡地质灾害工程为研究对象,针对方案实际施工难点和治理资金限制对方案进行分段优化。西侧嵌岩悬臂桩改为锚固桩,桩顶端增加锚索,底端纵筋植入基岩,解决微晶灰岩地区人工开挖困难、设计嵌固深度无法满足的问题。南侧方形抗滑桩变更为圆形抗滑桩,防止该侧滑坡复活地段孔壁坍塌变形,保障施工安全。圆形抗滑桩采用非均匀配筋的形式,经济合理,节约资源。利用有限元软件对南侧未嵌岩抗滑桩受力性能进行模拟,并对模拟结果和方案进行可行性分析。方案实施后监测结果表明,治理工程运营良好,治理效果明显。

Taking geological disaster project of a red clay landslide in Hengyang area as the research object, the scheme is optimized according to the actual construction difficulty and the limitation of fund. On the west of the site, bed rock consist of microcrystalline limestone brought difficulties to manual excavation and embedded depth that design required is also hard to meet. This problem was solved by prolonging the steels of piles into bed rock and the application of pre-stressed anchor on the top of embedded cantilever piles. During the construction process, the revival of landslide caused serious deformation of retaining wall. To ensure the safety of construction, anti-slide piles with rectangular section on the south side were replaced by those with round section. Besides, the method of non-uniform distribution of reinforcement which saved most cost was also used reasonably in this case. By using the finite element software, the mechanical properties of anti-slide piles which weren＇ t embedded into bedrock on the south side were simulated and the optimized scheme was also analyzed after stability calculating. After implementation, monitoring data showed that this scheme was feasible.