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通过对基坑现场监测的大量数据展开分析,获取了吊脚桩、嵌岩桩两类深基坑施工时周边地层沉降和侧移的空间分布规律。基于基坑的变形特性,将基坑周围建(构)筑物与基坑的接近程度分为“非常接近”、“接近”、“较接近”、“不接近”4个程度;根据基坑施工对周边环境及建(构)筑物的影响程度,将基坑周边区域划分为“明显影响区”、“较大影响区”、“普通影响区”。在“接近程度划分”和“影响分区”的基础上,从基坑“自身风险”和“环境风险”两个角度分析基坑施工安全风险评价影响因素,分别建立了基坑自身安全风险分级体系、基坑环境安全风险分级体系,实现了基坑施工对周边环境影响的定量评判,弥补了国家规范对基坑风险定义过于简单和定性模糊的不足。
Through the analysis of a large amount of data on the site monitoring of the pit, the spatial distribution of the settlement and lateral displacement of the surrounding strata during the construction of two types of deep foundation piles, such as hanging foot piles and rock-socketed piles, was obtained. Based on the deformation characteristics of the foundation pit, the closeness of the building (structure) around the foundation pit and the foundation pit is divided into “very close”, “close”, “closer”, “not close to” According to the degree of influence on the surrounding environment and the building (structure) of the foundation pit construction, the surrounding area of the foundation pit is divided into “obvious influence zone”, “larger impact zone”, “ordinary” Influence area “. On the basis of ”close degree “ and ”impact zone “, the influencing factors of safety risk assessment of foundation pit are analyzed from the perspectives of foundation pit ”own risk “ and ”environment risk ", The classification system of the safety risk of the foundation pit and the classification system of the environmental safety risk of the foundation pit have realized the quantitative evaluation of the influence of the construction of the foundation pit on the surrounding environment and made up for the deficiencies of the national norms in defining the risk of the foundation pit being too simple and qualitatively ambiguous.