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Study on the Calculation of Shotcrete and Rock Bolt Support Lattice Beam and Analysis on Three-Dimensional Finite Element

Author: MaLiBo
Tutor: ShiWei
School: Qingdao Technological University
Course: Geotechnical Engineering
Keywords: Lattice beam winkler elastic foundation beam Three-dimensional finite element - BEAM WITH
CLC: TU476
Type: Master's thesis
Year: 2008
Downloads: 44
Quote: 0
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Abstract


The process of urbanization to promote the development of deep foundation pit support technology, a wide range of support methods have emerged, lattice beam combined bolting and shotcreting with its easy construction, small footprint, economic security, etc. in the base widely used in the pit support. At present, a lot of this form of support at home and abroad, but from either theoretical or experimental aspects are based on the bolt and prestressed anchor of small, there is no qualitative and quantitative theoretical system for the study of the lattice beam. Lattice beam is the the lattice beam spray anchor Support System for a very important part of it is directly related to the quality of the working condition of the entire support system, and the lattice beam by the foundation, anchor the role of a number of factors, complex by force characteristics. Designers tend to root dig construction requirements and experience lattice girder design, usually on a simply supported beam structure, continuous beam, but these methods are not suitable for lattice girders, obviously unreasonable. Therefore, to study the lattice beam is very necessary and urgent task. To consider the combined effect of beams and foundation Winkler method, the introduction of dual-parameter method, considering the level of the Winkler method to derive the three-parameter formula to calculate the lattice beam. Mathematical software Matlab programming, computational analysis of the change in stiffness and foundation stiffness changes in beam force variation, several lattice beam to improve the applicability of the calculation methods and computational analysis. Original Winkler method and improved horizontal force taken into the calculation results with the measured values ??of the Winkler method is verified by comparing the advanced nature of the improved method. Qingdao Binhai Garden of deep excavation engineering lattice beam on-site monitoring, take stringers for the study, the internal forces of the beam is calculated by the measured beam strain. The instance lattice beam force, using structural analysis software ANSYS simulation project realistic simulation of the interaction of the beam and soil, reflects the image of the beam space role. Reasonable simplification and boundary treatment model to simulate the different states of the seven conditions during excavation beam, the calculation results are compared with the measured values ??to verify the feasibility of this approach. Through this research design and calculation method for spray in Qingdao anchor supporting design lattice beam, and other types of ground conditions suggest. While taking advantage of the the ANSYS calculation method has a good reference value of the lattice girder design calculations.

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