基于现场监测数据分析的深基坑安全风险评价体系

发布时间：2018-11-13 10:17

【摘要】：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。
[Abstract]:Based on the analysis of a large number of data from the field monitoring of foundation pit, the spatial distribution of ground settlement and lateral displacement of two types of deep foundation pit, I. e., hanging pile and rock-socketed pile, is obtained. Based on the deformation characteristics of the foundation pit, the close degree between the surrounding building and the foundation pit is divided into four levels: "very close", "relatively close" and "not close". According to the influence degree of foundation pit construction on the surrounding environment and building (construction), the surrounding area of foundation pit is divided into "obvious influence area", "big influence area" and "common influence area". On the basis of "close degree division" and "influence zone", this paper analyzes the influence factors of foundation pit construction safety risk evaluation from the two angles of foundation pit "self risk" and "environmental risk", and establishes the foundation pit safety risk classification system respectively. The environmental safety risk classification system of foundation pit realizes the quantitative evaluation of the impact of foundation pit construction on the surrounding environment, and makes up for the deficiency that the definition of foundation pit risk is too simple and fuzzy in the national code.
【作者单位】：陕西铁路工程职业技术学院;长安大学公路学院;张家口职业技术学院;
【基金】：国家自然科学基金资助,项目编号41472265 国家重点实验室开放项目,项目编号11JS061
【分类号】：TU753

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