Open trench vibration isolation design method based on quantitative analysis

Abstract

The invention discloses an open trench vibration isolation design method based on quantitative analysis. The method includes the steps that 1, a finite element calculation model related to the foundation is established; 2, foundation soil dynamic material parameters and a dynamic load time travel curve are determined; 3, a dynamic finite element basic equation is established, vibration isolation trenches with different depths are set on the finite element calculation model, the finite element calculation model is analyzed, and the dynamic finite element basic equation is solved by utilizing the dynamic material parameters and dynamic load of foundation soil to obtain mass matrixes, damping matrixes, stiffness matrixes and nodal load vectors of all node units of the finite element calculation model; 4, transient analysis is conducted to acquire a post-trenching surface vertical velocity response value; 5, according to the post-trenching surface vertical velocity response value, a post-trenching vibration velocity maximum value and distance relation curve of the vibration isolation trenches with different depths is obtained by fitting, and the range of a velocity response enhancementzone and a building and vibration isolation trench distance corresponding to an expected vibration isolation effect of the vibration isolation trenches in later engineering construction of the reinforcement zone are obtained through the curve.

Description

technical field [0001] The invention belongs to the field of earthquake vibration isolation engineering design, in particular to a design method for open trench vibration isolation based on quantitative analysis. Background technique [0002] The existing open ditch vibration isolation design methods mainly study the effect of excavating vibration isolation ditch on various ground vibrations, especially the vehicle load vibration on roads and railways. For example, the greater the depth and width of the vibration isolation ditch, the greater the vibration isolation effect. The more obvious, the farther the building is from the vibration isolation ditch, the safer it is, etc., but these methods have no specific size design basis in actual engineering, such as how far the building should avoid the vibration isolation ditch under a certain size condition. To achieve the expected vibration isolation effect and how to control the specific size of the vibration isolation ditch whe...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the object of the present invention is to provide a design method based on quantitative analysis for open ditch vibration isolation, which can solve the problem in the prior art that the distance between the vibration isolation ditch and the building cannot be accurately determined and the size of the isolation trench

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