Calculation method of soil engineering grid tensile force inside multilayer ribbed cushion layer

Abstract

The invention provides a calculation method of soil engineering grid tensile force inside multilayer ribbed cushion layer; the method comprises the following steps: firstly judging a pile net composite foundation plane layout parameter, then determining equivalent linear distribution loads at a ribbed cushion layer surface, and the like; determining a cross section parameter of a ribbed cushion layer equivalent composite plate structure; and then based on an elastic grade beam analyzing method, determining a ribbed cushion layer deformation equation and an internal force equation from a deformation coordinate boundary condition; based on the ribbed cushion layer deformation equation and the internal force equation, calculating a soil engineering grid tensile force caused by the deformation when the embankment filled earth subsides; based on an internal force balance equation under an embankment filled earth transverse slide threshold status, calculating the soil engineering grid tensile force caused by the embankment transverse slide; and finally, superposing the soil engineering grid tensile forces caused by the embankment filled earth subside deformation and the transverse slide, thereby obtaining the needed soil engineering grid tensile force parameter. In condition that multiple layers of soil engineering grids are laid on the top cushion layer of the pile net composite foundation piles, the calculation method is able to precisely calculate the tensile force parameter of each layer of soil engineering grid inside the cushion layer.

Description

technical field [0001] The invention belongs to the field of roadbed design and calculation in the subject of geotechnical engineering, and in particular relates to a method for calculating the tensile force of a geogrid inside a multilayer reinforced cushion layer. Background technique [0002] As a soft foundation treatment measure, pile-net composite foundation has the advantages of small settlement deformation, short duration of deformation stability, easy control of construction quality, and good economy, and is widely used in subgrade reinforcement projects in soft soil areas. In order to effectively equalize the upper filling load, reduce the stress concentration at the edge of the pile cap, increase the bearing capacity of the composite foundation, and reduce the overall settlement of the composite foundation, a certain thickness of reinforced cushion is usually laid on the pile top of the pile-net composite foundation. Therefore, the multi-layer reinforced cushion s...

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Problems solved by technology

[0007] Therefore, the calculation of the tension of the geogrid inside the multi-layer reinforced cushion is the key content of the design of the pile-top reinforced cushion of the pile-net composite foundation, while the existing calculation method for the tension of the geogrid can only calculate the tension of the single-layer geogrid and Neglecting the influence of the foundation reaction force at the lower part of the grid leads to large errors in the calculation parameters of the final geogrid tensile force, which is difficult to adopt in engineering design calculations

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