摘要
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。
A multi-storey building is located at the top of a slope, and the minimum distance between the building and the slope is 5.9 m. The slope adopts double-row piles, but the embedded depth is deficient. Due to the need of construction of residential buildings, the pit excavation is done at the slope toe and obvious subsidence and deformation of building is caused. The monitoring results show that the building appears uneven subsidence, the tilt rate significantly exceeds the allowable values, and the slope has obvious deformation. The deformation and subsidence monitoring results are analyzed and predicted by using the grey theory method. According the forecast results, the supporting measures should be taken for the slope, otherwise sliding failure will happen. So, the pile-anchor retaining wall is taken to support the slope. Since a circular sliding or a fold line sliding is possible, both the circular sliding method and the fold line method are used to analyze the slope stability. The stability of pile-anchor retaining wall is also analyzed to verify the rationality of the supporting measures for the slope.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2014年第S2期337-342,共6页
Chinese Journal of Geotechnical Engineering
基金
国家科技支撑计划课题(2014BAL05B07)
国家自然科学基金项目(51378403)
关键词
基坑开挖
坡顶
建筑物
沉降预测
稳定性分析
灰色理论
pit excavation
slope top
building
settlement prediction
stability analysis
grey theory
