摘要
城市地下隧道复杂多变的地层条件、极度敏感的城市基础设施环境,使得城市地下隧道盾构施工过程中面临极大的安全风险。为确保盾构机通过海陆交互相沉积区的施工安全及盾构隧道施工后的安全运行,本文以天津地铁11号线三经路站~六经路站双线隧道盾构区间施工为背景,采用MIDAS-GTS软件对不同施工错距、不同埋深下的地层位移、地表竖向沉降进行对比分析。结果表明:当错距开挖长度大于4.5倍隧道直径时,地表最终沉降值变化较缓,现场施工可在此范围外进行施工;整体地表横向沉降曲线呈现出“窄而深”的形态,施工中要根据沉降变化注意隧道盾构施工时的埋深。
The complex and changeable stratigraphic conditions of urban underground tunnels and the extremely sensitive urban infrastructure environment make the shield construction process of urban underground tunnels face great safety risks.In order to ensure the construction safety of the shield machine through the intersection of land and sea deposition area and the safe operation of the shield tunnel after construction,this paper takes the construction of the shield interval of the two-lane tunnel of Tianjin Metro Line 11 from Sanjing Road Station to Liujing Road Station as the example,and uses the MIDAS-GTS software to comparatively analyze the stratum displacement and the vertical settlement of the ground surface under different construction staggered spacing and different depths of burial.The results show that when the staggered excavation length is more than 4.5 times the diameter of the tunnel,the change of the final settlement value of the ground surface is slower,and the on-site construction can be carried out outside of this range;the overall lateral settlement curve of the ground surface shows a narrower and deeper pattern,so the construction should pay attention to the depth of the tunnel shield according to the change of the settlement.
作者
杨明勇
叶俊鹏
王雷亭
朱正国
孙奥杰
张硕
YANG Mingyong;YE Junpeng;WANG Leiting;ZHU Zhengguo;SUN Aojie;ZHANG Shuo(CCCC-SHEC Railway Construction Co.Ltd.,Xi’an 710076,China;Key Laboratory of Ministry of Education for Roads and Railway Engineering Safety Control,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Province Technical Innovation Center of Safe and Effective Mining of Metal Mines,Shijiazhuang 050043,China)
出处
《淮阴工学院学报》
CAS
2024年第2期80-86,共7页
Journal of Huaiyin Institute of Technology
基金
国家自然科学基金项目“纤维泡沫混凝土初期支护力学性能及减震机制研究”(51978424)。
关键词
地铁施工
双线盾构
地表沉降
数值模拟
subway construction
double track shield tunneling
surface subsidence
numerical simulation