Study On Displacement Discipline Of Appraching Excavation In Beijing Metro

With the development and utilization of underground space, A lot of the problem about the proximity construction of underground is emerging. New construction will disturb the underground structure of the surrounding soil, causing displacement around the existing structure and produce. thus, the normal use of the existing structure and ground buildings, roads is affected. In this thesis, The main study is that the problem of the proximity construction of underground tunneling in Beijing, as similar to the construction of underground Proximity to provide guidance and reference.In this thesis, for the study of these instance that Beijing new power tunnel through existing subway station and the subway entrance structure, structural engineering, the new tunnel beneath the existing subway station Structural Engineering. Through the method of theoretical analysis and empirical analog and so on conduct study and summarize, with regard to excavation proximity and various factors. The main contents and conclusions are as follows:(1) This thesis introduces the construction technology in China and other countries the research about influence of partition, dividing.(2) Build three-dismensional model to imitate that Beijing new power tunnel "L1" line engineering and tunnel construction beneath the subway station.By comparison and analysis to different grouting conditions, getting the result of impact about the lead small pipe grouting to the existing structures and the displacement of ground;By comparison and analysis to the different excavation footage of power tunnel, getting the result of impact about the different excavation footage to the existing structures and the displacement of ground;By comparison and analysis to different two-hole distance between tunnel face of power tunnel, getting the result of impact about it to the existing structures and the displacement of ground;By comparison and analysis to the power tunnel across equivalent structure of different sections, getting the result of impact about equivalent cross section to the existing structures and the displacement of ground;By changing the distance of the shield tunnel and subway station, getting the result of impact about different distance to the existing structures and the displacement of ground;(3) Compare mining method with shield method to the impact on the existing structures and the displacement of ground, and propose corresponding measures to weaken the effect of proximity construction.With futher improvement of our infrastructure building, proximity underground construction work will be more and more In the inheritance and development of the law to carry out the construction problems of proximity. Underground mining method on the construction works close to take some guiding significance and reference value...