复杂条件下改扩建工程基坑周边变形控制研究

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摘要研究目的:随着城市快速发展和扩张，中心城区的基坑工程紧邻既有建筑物和地下室，周边环境复杂，开挖过程需满足周边严格的变形保护要求，以及建筑物的正常使用。本文结合某综合楼的改扩建基坑工程的设计和成功实践，总结了相关的设计方法和措施，给同类基坑工程设计提供参考。

研究结论:(1)改扩建工程的基坑场地复杂多变、具有风险高、保护难度大、变形控制要求高、施工条件限制等特点;(2)偏载作用下基坑两侧水平变形存在不对称性，通过增大围护体系刚度能有效减小其侧移量，减小地面最大沉降量，遵循时空效应分块开挖有利于控制围护结构变形及周围地表沉降;(3)应加强信息化施工和过程控制，及时封闭支撑体系，根据监测数据调整施工或注浆加固;(4)本文提供的若干基坑周边变形控制措施，对相似的复杂条件下改扩建工程基坑设计和实施方案选择有-定的参考意义。

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	孙毅

关键词 ：改扩建工程, 基坑开挖, 变形控制

Abstract：Research purposes: With rapid urban development and expansion，the foundation pit engineering of the central city is adjacent to both the existing building and basement，surrounding environment is complex，the excavation process must meet the strict protection requirements of deformation surrounding, as well as the normal use of buildings. Combined with the reconstruction foundation pit engineering design and successful practice of a certain complex building，this paper summarized the relevant design methods and measures，to provide reference for similar foundation pit engineering design.

Research conclusions:(1)The foundation pit area of reconstruction and expansion project is always complicated，with high risk and difficult to protect, high deformation control requirements and limit construction conditions，etc. ( 2)It is concluded that under the partial load levels each side of the pit deformation has obvious asymmetry. Increasing the stiffness of support system can effectively reduce the horizontal displacement and the maximum ground settlement. Following the time-space effect partitioned excavation is conducive to control the deformation and ground settlement. (3)Strengthen the information construction and process control，close the support system in time，according to the monitoring data adjust construction or grouting reinforcement.(4)This paper provides several measures to control deformation of foundation pit surrounding，has also certain reference significance to foundation pit design and implementation scheme selection for similar projects under complicated environmental conditions.

Key words： reconstruction and expansion project excavation of foundation pit deformation control

收稿日期: 2014-02-27

PACS:

TU473

作者简介: 孙毅，1985年出生，男，工程师

引用本文:

孙毅. 复杂条件下改扩建工程基坑周边变形控制研究[J]. 铁道工程学报, 2014, 31(6): 9-12.
SUN Yi. Research on the Deformation Control for Surrounding the Foundation Pit in Reconstruction and Expansion Project under Complicated Environmental Conditions. 铁道工程学报, 2014, 31(6): 9-12.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2014/V31/I6/9

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