深基坑开挖对邻近建筑物基础的影响研究

发布时间：2018-01-03 11:14

本文关键词：深基坑开挖对邻近建筑物基础的影响研究　出处：《南昌航空大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着我国经济和城市建设的快速发展，城市地下空间的开发与利用越来越受到重视。因此，大量的深基坑甚至是超深基坑随之而来，这些深基坑通常位于闹市区，基坑周边往往建（构）筑物密集、管线繁多、地铁车站密布、地铁区间隧道纵横交错，呈现出“深、大、近、紧、难”的新特点。城市地区深基坑施工难度大、工期紧，而且不可避免的带来一系列工程环境问题，特别是对深基坑开挖引起邻近建筑物基础的影响及控制措施研究，对进一步完善深基坑支护工程设计，减少事故发生频率具有十分重要的理论和现实意义。本文以南昌轨道交通1号线某基坑工程为研究背景，借助数值模拟方法，对深基坑开挖对邻近建筑物基础沉降的影响进行了研究。主要研究工作和取得成果如下：首先，根据国内外学者的研究现状，概述了基坑开挖引起建筑物损坏的基本理论，，并对基坑开挖引起的建筑物地基变形预测方法进行了归纳和总结。其次，结合南昌地铁深基坑工程实例，采用数值模拟方法，建立了基坑开挖数值计算模型，探讨了深基坑开挖对邻近建筑物基础沉降的影响。计算结果表明：数值模拟结果与工程经验基本吻合，说明数值模拟方法可用于对实际工程的前期计算分析；基坑开挖对周围建筑物的倾斜影响程度与邻近建筑物的位置有关，基础离基坑距离越近，沉降变形影响越大；差异沉降并不完全随距离的增加而减小，当建筑物基础一端在沉降槽区域内，而另一端跨越1倍的开挖深度范围时，基础差异沉降最大，建筑物倾斜变形也最大；基础埋置深度及上部荷载的大小均对建筑物基础沉降有较大影响；基础自身刚度对抵抗弯曲变形能力有积极作用，但对减小建筑物基础不均匀沉降意义不大。最后，重点考虑内支撑刚度、围护墙嵌固深度、坑外设置隔断墙、基础托换四种工程措施的影响，对基坑开挖对建筑物基础沉降控制措施进行了研究。分析结果表明：四种工程措施均对减小建筑物基础沉降均有积极作用，其中采取增设坑外隔断墙和基础托换措施对减小建筑物基础沉降效果最为明显，在具体工程应用中，建议综合考虑各种影响因素，选择出既经济又安全的控制措施。
[Abstract]:With the rapid development of China's economy and city construction, development and utilization of underground space in the city more and more attention. Therefore, a large number of deep foundation pits and even ultra deep excavation of deep foundation pit followed, these are usually located in the downtown area, around the pit are often built (structure) building density, pipeline variety, subway station with subway showing a deep tunnel arranged in a crisscross pattern, and large, close, tight, new characteristics difficult. The difficulty of construction of deep foundation pit in city area, time is tight, and inevitably bring about a series of engineering environmental problems, especially the influence caused by adjacent building foundation excavation and control measures of deep foundation pit, to further improve the deep foundation pit support engineering design, reduce the frequency of accidents has very important theoretical and practical significance. In this paper, a foundation pit in Nanchang Metro Line 1 as the research background, with the help of the numerical simulation method of the deep The influence of the foundation pit excavation on the settlement of the adjacent buildings is studied. The main research work and the results are as follows:
First, according to the research status of scholars at home and abroad, the basic theory of building damage caused by foundation pit excavation is summarized, and the prediction methods for foundation deformation caused by excavation are summarized.
Secondly, combined with the deep excavation of Nanchang Metro as an example, using the method of numerical simulation, established a numerical calculation model of foundation pit excavation, discusses the influence of deep excavation on adjacent buildings settlement basis. The calculation results show that the numerical simulation results and engineering experience are basically consistent, shows that the numerical simulation method can be used to analyze the pre calculation of the actual engineering slope; the degree of impact on the surrounding buildings and buildings near the excavation location of the foundation pit from the closer, the greater the influence of settlement; differential settlement is not completely decreased with the distance increase, when the building foundation end of the settlement trough area, while the other end is 1 times across the range of the depth of excavation, foundation difference the maximum settlement, building inclination deformation is the biggest; the buried depth of foundation and the upper loads have much influence on the foundation of building foundation settlement; The stiffness of the foundation has a positive effect on resistance to bending and deformation, but it is not significant to reduce the uneven settlement of the building foundation.
Finally, consider the support stiffness, wall embedded depth, the pit is arranged outside the partition wall, supporting effect for four kinds of engineering measures, the control measures of building foundation pit excavation. The results show that: four kinds of engineering measures are to reduce the building foundation settlement has many positive effects, including take additional pit outside the partition wall and foundation underpinning measures to reduce the building foundation settlement effect is most pronounced in concrete engineering application, suggestions considering various factors, selection of control measures is economical and safe.

【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU47

【参考文献】