Research On Ground Subsidence Caused By Lanzhou Metro Tunnel Construction

With the continuous development of underground space,the methods of subway tunnel construction are constantly updated and developed,among which shield tunneling and underground excavation have become the most common methods in subway tunnel construction.However,tunnel construction is often accompanied by the occurrence of surface settlement,when the local surface settlement reaches a certain amount,ground collapse may occur,causing serious impact on the buildings on the ground.Therefore,the analysis,prediction and monitoring of surface settlement are very important in engineering design and construction.By collecting all kinds of literature,this paper firstly expounds the research background and research status at home and abroad,and at the same time,it plans the technical route of the research.By collecting geological survey,design,and risk assessment in the process of construction materials,the first phase of the research area of lanzhou railway line 1 "five shop ? the east market" shield interval and "Gong Xing pier ? jiaojia bay" underground running range of engineering survey,geological and hydrological conditions,underground and the surrounding environment,formation physical parameters,organize the collection.The technological process of shield tunneling and shallow buried excavation,the factors causing surface settlement,the main measures to control settlement and the main stages of settlement are described.According to monitoring data in engineering construction,combined with the engineering geological characteristics of the parameters,construction technique in the study area,such as the two paragraphs in the same construction method under different tunnel buried depth,shield of disturbance and different formation and the shallow depth excavation method disturbance in different stratum,the shallow depth excavation method different hole diameter size effect rule of surface subsidence analysis and research,finally it is concluded that the tunnel construction method and the buried depth of vault,disturbance of different strata and different hole diameter on the ground surface settlement affect how the conclusion,in the subsequent lanzhourailway line 2,3,4,5,design and construction of surface subsidence control play a reference role.