Study On The Surface Subsidence Caused By Construction Of Urban Double-arched Tunnel

Urban Tunneling engineering in China is flourishing development, and also emerged massive geotechnical engineering technical problems to be solved. Surface Subsidence caused by construction may endanger the surrounding buildings and the safety of underground pipelines, resulting in serious economic losses and social impacts. Therefore, how to prevent tunnel collapsing in the course of construction and reliably predict and effectively control ground subsidence to protect the buildings and underground pipeline along the tunnel has become an important subject that must be solved.On the ultra-shallow double-arched tunnel,neighbor-intensive buildings, the construction of the tunnel project is difficulty and risk. The distribution of surface subsidence caused by construction is also extremely complex. Resent research work of surface subsidence is concentrated mostly in shield construction. Judging from the geological conditions and existing city tunnel construction methods, the main method of the Construction of the tunnel is mining method. However, due to the diversity of the tunnel construction methods and the complexity of engineering geological and hydrogeological conditions, the research on the subject is not sufficient., the deficient documentation and weak theoretical research is extremely disproportionate with vigorous development of such engineering practice. Based on practical engineering background, the relevant research and analysis are performed. Based on calculated results and measured data, we establish formula of surface subsidence. The formula established verified by numerical analysis and construction monitoring and measurement is repreducibleIn tunnel construction, we not only consider the cavern stability, we also consider safety of architecture on the ground. Therefore, before the tunnel construction or in the course of construction, we must master type, age, usage of the buildings along the project, and so on, understanding the degree of damage to the surrounding buildings, on the basis of surface movement and deformation, we prepare to give the planned measuring and monitoring, According to evalution method and index, we put forward measures that reduce harmful effects of the buildings.