摘要
以成都轨道交通某地铁工程盾构隧道侧穿某酒店高层建筑物的实际项目为工程背景,借助MIDAS GTS NX建立有限元模型计算并结合现场建筑物墙体地表沉降实际监测值,分析了盾构隧道掘进对邻近高层建筑的变形、内部结构受力特性和地表沉降的影响规律。研究结果表明:裙楼+塔楼组合形式的高层建筑的最大沉降值为5.16 mm,倾斜度为0.004,在裙楼上部塔楼荷载的作用下,建筑物的整体沉降和倾斜度有所增大,靠近隧道侧墙体地表处沉降值最大,远离隧道范围内建筑物沉降值逐渐减小;内部楼柱整体的剪力和轴力值也相应增大,盾构隧道侧穿高层建筑物施工过程中,裙楼+塔楼建筑物本身受力很大,其裙楼与塔楼交接处的受力变化较为显著,是建筑物存在最不利荷载的部位。根据研究得到盾构施工对高层建筑的变形及受力特性规律,对以后的类似工程有一定的指导作用。
Based on the actual project that a shield tunnel of a subway project in Chengdu Metro passes through a high-rise building of a hotel as the engineering background,the MIDAS GTS NX is used to establish a finite element model calculation and combined with the actual monitoring value of the surface settlement of the building wall on site to analyze the shield tunnel influence of excavation on the deformation of neighboring high-rise buildings,internal structural stress characteristics and ground settlement.The research results show that:the maximum settlement value of the high-rise building in the form of a podium+tower is 5.16 mm,and the inclination is 0.004;under the load of the upper tower of the podium,the overall settlement and inclination of the building have increased,approaching the settlement value at the surface of the tunnel side wall is the largest,and the settlement value of the buildings in the distance away from the tunnel gradually decreases;the overall shear and axial force values of the internal building columns also increase accordingly.During the construction process of the shield tunnel passing through the high-rise building,The podium+tower building itself bears a lot of stress.The stress at the junction of the podium and the tower changes significantly,and it is the most unfavorable load part of the building.According to the research,the deformation and stress characteristics of shield construction on high-rise buildings can be used to guide similar projects in the future.
作者
张轩
田奉鑫
ZHANG Xuan;TIAN Fengxin(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China;Chinma Water Resources and Hydropower Seventh Engineering Bureau,Chengdu 610213,China)
出处
《四川建筑科学研究》
2020年第6期80-88,共9页
Sichuan Building Science
关键词
盾构隧道
高层建筑
数值模拟
建筑物沉降
受力分析
地表沉降
shield tunnel
high-rise building
numerical simulation
building settlement
stress analysis
surface settlement
