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Study on Reasonable Excavation Methods and Optimization of Structural Parameters of Subway Station by Open-cut and Undermining of Soil and Rock Stratum

Author: CongYu
Tutor: WangZaiQuan
School: Qingdao Technological University
Course: Engineering Mechanics
Keywords: Combination of soil and rock strata Cover down Excavation Shallow Mining Method Orthogonal design Strength Reduction
CLC: U213.4
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
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Abstract


Qingdao Fourth Square subway station construction engineering background , combined with the of Qingdao Subway Line No. 3 overall design and geological exploration data , explore the Fourth Square station cover down Excavation , shallow tunneling method construction design feasibility , compare two 's strengths and weaknesses. Stability analysis using finite element analysis software ABAQUS different design of the surrounding rock and its supporting structure , and related parameters have been optimized to further explore the feasibility of the May Fourth Square station excavation scheme . The main research work are as follows : ( 1 ) using the finite element software ABAQUS stability analysis of cover down Excavation and mining method design , and the use of strength reduction given two construction conditions surrounding rock safety factor : cap down Excavation design safety factor of 1.49236 , mining method design safety factor of 2.765 . From the simulation results, the design can meet the stability requirements . ⑵ on the cover design down Excavation foundation parameters to optimize the simulation from the surface subsidence , building envelope and the main structural stability were analyzed to determine reduce the pile foundation depth of 2m , can still ensure that the existing wall rock and the structural stability of the surrounding rock safety factor of 1.45 . ( 3 ) combined with orthogonal design , simulation of the construction of the mining method and the test results of range analysis to determine the factors that affect the stability of surrounding rock sequence , respectively, is the depth of the lining strength , stress release rate . Combined with specific analysis of the results , and that the program 8 ( 20% of the rate of stress release , lining strength C35 (2%), depth of 23.73m) is the best solution of the orthogonal design , the safety factor is 1.69 .

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