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某边坡顶部有一多层建筑物,建筑物距边坡坡肩边缘的最小距离为5.9 m,边坡采用“双排桩”支护,但其嵌固深度不足。由于坡脚开发住宅楼,平整场地,在距离既有边坡坡脚9 m处开挖地下室基坑(深度4 m),诱发了边坡滑动,导致建筑物变形。对建筑物进行变形观测,分析监测结果,得出了“建筑物发生显著不均匀沉降、倾斜率超过允许值,基坑开挖导致既有边坡产生了较明显的变形”的结论;采用双曲线法、指数曲线法和灰色理论等方法进行沉降预测,根据预测结果得出了“既有边坡需采取支护措施,否者会发生破坏”的结论;采用“排桩式锚杆挡墙”支护对既有边坡进行二次治理,根据坡体可能产生圆弧滑动或折线滑动模式,对其进行稳定性计算,以及支护结构的内力与变形计算,为既有边坡的治理方案提供了依据。
The top of a slope has a multi-storey building with a minimum distance of 5.9 m to the shoulder edge of the slope and a “double-row staked” support for the slope, but the depth of its embedding is not sufficient. Due to the development of the residential buildings at the foot of the slope and the formation of the site, excavation of the basement pit (depth 4 m) at a distance of 9 m from the foot of the existing slope caused the slope to slip, causing the building to deform. Deformation observation of the building, analysis of monitoring results, concluded that “significant uneven settlement of buildings occurred, the slope exceeds the allowable value, excavation led to the existing slope produced a more obvious deformation ” conclusion; The subsidence prediction method is based on the hyperbolic method, exponential curve method and gray theory. According to the prediction results, it is concluded that “the existing slope needs to take supporting measures, otherwise, the damage will occur” According to the slope body may have circular sliding or polyline sliding mode, its stability calculation, as well as support structure of the internal forces and deformation calculations for the The existing slope management programs provide the basis.