摘要
目的:由地铁施工带来的地层扰动会引起地基及其基础的应力重分布和地面变形,若控制不当,则会引发房屋倾斜和损坏等后果。老旧房屋存在结构老化、拆改严重等问题,当地铁盾构穿越时,其施工难度更高,控制措施更为复杂,具有较大的施工挑战性,因此需对盾构隧道下穿复杂建筑物的关键技术进行研究。方法:以郑州地铁5号线为例,建立了建筑物简化计算模型,对盾构下穿建筑物变形进行数值分析,提出盾构下穿过程中建筑物的差异沉降控制值和变形控制措施。结果及结论:在盾构下穿过程中,实测23#楼的最大差异沉降值为5.8 mm,11#楼的最大差异沉降值为5.3 mm,综合楼的最大差异沉降值为5.5 mm;实测结果与差异沉降控制值相比,部分测点达到数据预警状态,但总体建筑物的差异沉降值基本位于控制值范围内;与计算模拟结果相比,实测结果明显低于数值计算结果,验证了施工中所采取的加固措施的有效性。
Objective:Ground disturbances caused by metro construction can result in stress redistribution and land deformation of foundations.Improper control of these factors can lead to consequences such as tilting and damage to buildings.Older buildings with structural aging and extensive renovations face significant challenges when a metro shield tunnel passes beneath them,requiring more complex control measures.Therefore,it is necessary to study the key technologies for shield tunnel under-passing complex buildings.Method:Taking Zhengzhou Metro Line 5 as example,a simplified calculation model of the buildings is established for numerical analysis of the deformations caused by shield tunneling.Differentiation settlement control values and deformation control measures for buildings during shield tunneling are proposed.Result&Conclusion:During the shield tunnel under-passing process,the maximum measured differentiation settlement values for Building 23,Building 11,and the comprehensive building are 5.8 mm,5.3 mm,and 5.5 mm respectively.Some field-measured values approached the data alert state compared to the differentiation settlement control values,but the differentiation settlement values of the overall buildings are within the acceptable range.When compared to the calculation simulation results,the field-measured results are significantly lower,demonstrating the effectiveness of the reinforcement measures implemented during construction.
作者
何况
HE Kuang(Zhengzhou Rail Transit Co.,Ltd.,450018,Zhengzhou,China)
出处
《城市轨道交通研究》
北大核心
2023年第9期62-68,73,共8页
Urban Mass Transit
关键词
地铁
盾构隧道
下穿
复杂建筑物
metro
shield tunnel
under-passing
complex building
