地下增层工程中既有结构变形控制技术研究  

Deformation control techniques for existing buildings during construction process of basement

作　　者：文颖文 刘松玉[1] 胡明亮 张国柱[1] 

机构地区：[1]东南大学交通学院,江苏南京210096 [2]江苏建筑科学研究院有限公司,江苏南京210096

出　　处：《岩土工程学报》2013年第10期1914-1921,共8页Chinese Journal of Geotechnical Engineering

摘　　要：既有建筑物地下室增设工程中,施工会造成既有结构不均匀沉降、倾斜、甚至产生裂缝,影响既有结构的安全和正常使用。针对中国工商银行某办公楼地下增层这一工程案例,结合对既有建筑结构形式、现场周边环境、施工条件以及作业空间的调研,提出了锚杆静压桩托换变形控制技术。为了确保在地下增层过程中既有建筑的安全性,采用考虑桩–土–结构共同作用的分析方法,对施工过程进行三维数值模拟分析,确定合理的托换桩长和桩截面。现场监测结果表明,施工过程中既有结构的沉降变形与计算结果吻合较好,说明本工程的变形控制技术制定合理、施工措施得当,结构处于安全范围之内。During the construction process of basement beneath the existing buildings, no matter what kind of construction method is applied, it is inevitable to induce the subsidence, sloping and even crack of the existing buildings on the ground, and it will influence the safety and routine use of the existing buildings. With regard to the construction characteristics of basement beneath the office building project of China Industrial and Commercial Bank and based on the investigations into the existing building structures, surrounding environment, construction conditions and operating space, the static bolt-pile deformation control technique is proposed. In order to ensure the safety of the upper structures, and considering the pile-soil-structure interaction, a 3-D numerical analysis is conducted in order to determine the reasonable pile-length and pile-section. The monitoring results show that the settlement of the structures during the construction process is in good accrrdance with the calculated results. The deformation control technique is reasonable, the construction measures are appropriate, and the structures are in the range of allowable safety.

关 键 词：既有结构 变形控制 地下增层 锚杆静压桩 桩-土-结构共同作用 数值模拟 

分 类 号：TU47[建筑科学—结构工程]