相邻深基坑施工相互影响的研究

发布时间：2018-05-07 00:18

本文选题：相邻深基坑 + 有限元法　；参考：《长沙理工大学》2013年硕士论文

【摘要】：随着我国城市建设的不断发展，各大城市都正在兴建或准备兴建地铁。城市地铁的修建过程中涉及到大量的深基坑工程，并且常常是处于密集建筑区内，就不免出现深基坑施工和周围建筑物的相互影响问题。对于这类相邻施工问题，，大量学者已经认识到以往的基坑工程强度设计理论已经不能满足工程周围环境的安全性要求，越来越严格的基坑工程变形控制要求运用到实际工程之中，但相邻问题仍然还有许多需要解决的难题。本文结合长沙市南湖路地铁车站基坑工程和其附近的高层建筑地基深基坑工程，研究相邻深基坑在施工过程中相互作用导致基坑应力场、位移场以及坑周土体的变化情况。主要内容有： 1．参考国内外的有关文献和资料，选取三维有限元数值模拟方案，确定土体、支护结构的计算参数。 2．地铁车站基坑先开挖写字楼基坑慢开挖时，考虑地铁车站基坑的存在对写字楼基坑开挖的围护结构变形和坑周土体的影响以及写字楼基坑的开挖对开挖完成的地铁车站基坑变形的影响。 3．不同的施工顺序对相邻基坑的影响。考虑三种施工顺序（车站基坑先开挖楼基坑慢开挖、两基坑对称开挖、楼基坑先开挖车站基坑慢开挖）下两基坑变形的变形情况，比较不同施工顺序下基坑的变形。 4．基坑间距对相邻基坑的影响。考虑两基坑施工顺序一定，基坑距离为5m、10m、15m、20m时，两基坑的变形和坑周土体的变形情况，得出基坑变形和坑周土体变形随着距离不同的变化规律。
[Abstract]:With the continuous development of urban construction in China, all major cities are building or preparing to build subway. The construction process of urban subway involves a large number of deep foundation pit projects, and is often in the dense building area, so the interaction between the construction of deep foundation pit and the surrounding buildings will inevitably occur. For this kind of adjacent construction problem, a large number of scholars have realized that the previous foundation pit engineering strength design theory can no longer meet the safety requirements of the surrounding environment of the project. More and more strict foundation pit engineering deformation control requirements are applied to practical engineering, but there are still many problems that need to be solved. In this paper, the stress field, displacement field and soil around the pit of adjacent deep foundation pit caused by interaction between adjacent deep foundation pit during construction are studied by combining the foundation pit engineering of Nanhu Road subway station and its surrounding high-rise building in Changsha City. The main contents are: 1. Referring to the relevant literature and data at home and abroad, the three-dimensional finite element numerical simulation scheme is selected to determine the calculation parameters of soil and supporting structure. 2. When the subway station foundation pit is first excavated, the office building foundation pit is slowly excavated, Considering the influence of the foundation pit of subway station on the deformation of the surrounding structure and the soil around the pit and the influence of the excavation of the office building foundation pit on the deformation of the subway station foundation pit completed by the excavation. 3. The influence of different construction sequence on adjacent foundation pit. Considering three kinds of construction sequence (slow excavation of station foundation pit, symmetrical excavation of two foundation pit, slow excavation of station foundation pit first), the deformation of foundation pit under different construction sequence is compared. 4. The influence of foundation pit spacing on adjacent foundation pit. Considering the constant construction sequence of the two foundation pits and the deformation of the soil around the pit when the distance of the foundation pit is 5 m ~ 10 m or 15 m ~ 20 m, the variation law of the deformation of the foundation pit and the soil around the pit with the distance is obtained.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU753

【参考文献】