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Analysis on the Stability of Surrounding Rocks and Its Safety Guarantee Measures in Qingdao Close Overlapping Underground Engineering

Author: LuLinHai
Tutor: WangWeiMing
School: Shandong University of Science and Technology
Course: Geotechnical Engineering
Keywords: Overlap the tunnel Orthogonal design Deformation control Construction methods Numerical Simulation
CLC: TU457
Type: Master's thesis
Year: 2008
Downloads: 39
Quote: 0
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Abstract


Close overlap underground engineering surrounding rock stability of tunnel security research is an important research topic in the city subway network, In this paper, the geological conditions in Qingdao City subway overlap tunnel project, the construction environment as research background, the use of theoretical analysis and numerical simulation method of combining the impact of deformation factors, a model formula derivation, the deformed control measures, construction methods to optimize these four aspects depth study of the technical problems during construction of the tunnel close overlap, four aspects specific as follows: (1) close overlap underground engineering surrounding rock stability of tunnel lining structure deformation influencing factors, and sorted according to the importance of each factor, clear the degree of influence of various factors and investigated; obtained by fitting the existing tunnel lining arch bottom deformation the groove largest settlement formula, by comparison with the simulation results, indicating that the fitting formula can replace the numerical simulation and prediction of the maximum settlement of the existing tunnel lining the bottom of the arch; (2), according to the close overlap existing tunnel deformation both features, the use of elastic foundation beam theory, put forward a new model, the derivation of the formula for calculating the angle of the slope of the settlement of the inflection point of the arch at the end of the existing tunnel lining deformation slot and maximum subsidence, which complements the close overlap underground engineering tunnel lining deformation theory of computation and reliable formula and rationality by numerical analysis of the verification; (3) summarizes the close overlap tunnel deformation and failure of the law, for which the deformation characteristics to simulate five engineering reinforcement measures analyzed their reinforcing effect and reinforcement characteristics, by optimizing the combination of control close tunnel deformation engineering countermeasures; determine the setting position of the existing tunnel deformation joint: ④ In addition, in order to prevent non-uniform deformation damage caused, simulated three different construction methods tunnel excavation of a new line of dynamic construction process, each excavation method of surrounding rock and tunnel lining deformation characteristics of the final recommendations of the engineering the bench method-CRD method - step method of construction open digging the new line of the tunnel, and the settlement of the existing tunnel lining vault distribution control indicators developed for the CRD method provides a theoretical basis and technical support for the construction of the project. These basic illustrates the basic technical problems faced by the new line tunnel through the existing tunnel, mastered the deformation law of surrounding rock and lining structure of such works, and found to effectively control the deformation engineering countermeasures and excavation of deformation control for close overlap underground engineering, supporting the design and excavation optimal design suggestions and theoretical basis to protect the safety of the the overlap underground construction operations.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Rock ( rock ) mechanics and rock testing > Rock stability analysis
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