Study On Ground Deformation Control Technology Of Metro Shield Tunnel Across The Existing Across Building

With the rapid growth of the national economy and the accelerate pace ofurbanization in the country, and the expanding urban construction and a large numberof migrant workers, Traffic jams become the norm of modern urban transport, Metrotraffic with its "large volume, high speed, convenient and comfortable, not the floorspace," and so has become the first choice to solve the problem of urban trafficcongestion, Subway construction of the main shield law, mining law, open-cut method,tunneling method, etc. Which shield tunnel with its unique intelligent, safe, efficientfeatures and advantages, has been widely promoted and applied in undergroundengineering, But, As the shield construction likely to cause land subsidence anddeformation, In particular, too large settlement could endanger the safety ofunderground pipelines and the surrounding buildings and etc. Causing seriouseconomic losses and social impact. Therefore, it is imperative to study grounddeformation control when shield tunneling technology through existing buildings, Onthe one hand to control the ground to ensure the realization of the construction doesnot affect the normal situation to ensure the smooth crossing shield existing buildings,On the other hand can guarantee that ground deformation within the allowable range,so as not to affect the normal use of the building.With the help of Beijing Subway Line6Phase II Shield, shield tunnel project offthe Xinhua Street station to North station actually works. Access to reference previousresearch done, By pre-test data, a large number of on-site monitoring data analysisand numerical simulation in order to achieve this goal.This paper studies proceed from the following aspects:1、A brief discussion of current research: the development process of Shield, theprediction methods surface subsidence, And the impact of construction onneighboring buildings, Describes the shield construction land subsidence caused bytheoretical studies, including spatial and temporal effects of ground movement theory,spatial effects, disturbances settlement mechanism and characteristics.2、Details the engineering geological conditions and shield construction principle ofshield construction through the region, Detailed analysis of the experimental dataobtained segment improved slurry quality control, Strictly control the right line through sedimentation control standards of4mm, When the left lane is reserved forthe settlement by the control value, Ensure that when the wire by controlling the valueof the settlement in the design of the allowable range10mm.3、According to the three-dimensional model simulations of surface deformationestablish reasonable parameters of the test section caused by the construction segment,with good agreement with the experimental results, the establishment on the basis ofthree-dimensional model of the building when the analog side of the wear and wearthrough under construction when material surface deformation, and the constructionsite monitoring data do comparison, come to a reasonable conclusion.。4、Starting from the ground subsidence caused by construction of the Beijingsubway tunnel, analysis the main cause land subsidence, Build three-dimensionalmodels, by giving some reasonable assumptions and different parameters of rock andsoil to represent different soil, To simulate the effects of shield construction of surfacesubsidence simulation by changing the construction of different constructionparameters.5、Through on-site monitoring and numerical simulation analysis, Combined withpractical engineering parameters and their effects on soil caused, Boldly proposedconstruction safety measures, To reduce the risk of building the ground.Hope to bringeffective help to the actual construction and prevention of post-monitoring.