Design Study Of Prestressed Assembled Variable Section Slope Reinforcement Beam

Slope support engineering is an important field in geotechnical engineering,and prestressed anchor cable frame beam is an important method of slope support,and it is the development trend of future slope support.At present,the mainstream method of prestressed anchor lattice beam in China is still prestressed cast-in-place anchor lattice beam,which has disadvantages such as easy cracking,high cost and long construction period compared with prestressed assembled variable section anchor lattice beam.Therefore,in order to introduce prestressed assembled lattice beams with variable section into practical use,relevant research is needed.The main research of this paper is the theoretical calculation method of internal force and deformation of prestressed assembled lattice beams with variable section and the design process of corresponding support scheme for specific engineering cases.The paper firstly discusses the finite difference calculation method of internal force and deformation of elastic foundation beam,and proposes the corresponding finite difference method on how to calculate the internal force and deformation of elastic foundation beam with normal section and variable section,and verifies with relevant papers and actual engineering cases,and confirms that the method can be used to calculate the internal force and deformation of elastic foundation beam with normal section and variable section.The corresponding finite difference method is proposed and validated with relevant papers and practical engineering cases,which confirms that the method can be used to calculate the internal forces and deformations of elastic foundation beams with normal and variable sections.On the basis of the above finite difference method for calculating the internal force and deformation of elastic foundation beams,the finite difference method for calculating the internal force of Pasternak elastic foundation beams with prestressed variable cross-section was derived and used to calculate the internal force and deformation of the test section of the assembled frame beam of Mengping Expressway.The accuracy of the derived calculation method is verified by comparing it with the measured data and numerical analysis data.The theoretical equations can be used to calculate the internal force and deformation of the pre-stressed assembled variable section anchor lattice beam,and the process and ideas of how to design the pre-stressed assembled variable section anchor lattice beam support scheme are given for the slope support project of Yanjin Station of the new Chongqing-Kunming high-speed railroad.By post-processing the numerical simulation results,the internal force and deformation law of the prestressed assembled variable-section anchor lattice beam can be understood more clearly,and the numerical analysis results also verify the accuracy of the theoretical calculation method.The numerical simulation results can also be used to optimize the design scheme in the reverse direction,and the numerical simulation provides strong evidence for the theoretical design,which can make the design scheme more reasonable.This paper provides some technical support for the calculation of internal force and deformation of prestressed assembled variable-section anchored frame lattice beams,and the acquisition of design solutions for specific projects.