坡顶存在需保护建筑物的边坡防护设计与施工研究

Study on Design and Construction of Slope Protection of Buildings Needing Protection at Top of Slope

摘要:

当坡顶有危险性建筑物时，边坡防护的支护方案，除应保证边坡整体稳定外，还应特别注意控制边坡变形对坡顶建筑物产生的危害。边坡变形计算复杂，与支护结构类型及施工开挖方法等因素相关，如何通过控制变形允许值来确定最优支护方案通常只能依据地区工程经验。本实例通过分析岩面以上均匀土体的整体下滑力来计算各支护模型的内力及变形，在均满足整体稳定性的要求下，比较多种支护结构的变形值，从而确定满足变形允许值的最优方案，并通过采用特殊施工方法，变形监测等措施保障支护方案顺利实施，经施工期间和竣工后两年观测，边坡稳定，受保护房屋安全，由此总结出将桩顶微距离位移控制值作为支护方案评价指标可行。

Abstract:

When the important buildings at the top of the slope are required to protect, the supporting scheme of slope protection is used, which should not only ensure the overall stability of the slope, but also pay special attention to control the damage of slope deformation to the buildings at the top of the slope. The calculation of slope deformation is complicated, which is related to the type of support structure and the method of construction excavation. It is only to base on the engineering experience of region for how to determine the optimal supporting scheme by controlling the allowable value of deformation. The internal force and deformation of each supporting model are calculated by analyzing the whole gliding force of the uniform soil above the rock surface. The deformation value of each supporting structure is compared under the requirements of satisfying the overall stability so as to determine the optimal scheme satisfying the allowable value of deformation. The special construction methods and the deformation monitoring measures are adopted to ensure the smooth implementation of the supporting scheme. By the observation of construction period and two years after completion, the slope is stable and the protected houses are safe. Therefore it is concluded that it is feasible to take the micro-distance displacement control value of pile top as the evaluation index of supporting scheme.