Soil body state data calculation method and device based on boundary surface plasticity model

Abstract

The invention discloses a soil body state data calculation method and device based on a boundary surface plasticity model. The method comprises the following steps: acquiring soil body state data of a previous increment step; calculating a first soil mass increment based on the soil mass state data, a preset strain increment and the initial sub-increment step length; calculating a second soil mass increment through the soil mass state data and the first soil mass increment; calculating a local truncation error according to the soil state data, the first soil increment and the second soil increment; when the local truncation error is smaller than a preset error threshold value, obtaining soil body state data of the current sub-increment step based on the soil body state data of the previous increment step, the first soil body increment and the second soil body increment; and then recursive calculation is carried out in sequence until the soil state data of the last sub-increment step is obtained, so that the soil state data of the current increment step is obtained. According to the method, the sub-increment step length near the stress reverse point is adjusted, so that the position of the stress reverse point is more accurately captured, and the calculation precision of the soil state data is improved.

Description

technical field [0001] The invention relates to the technical field of rock and soil mechanics, in particular to a method and device for calculating soil state data based on a plastic model of a boundary surface. Background technique [0002] Since the mathematical expression of the incremental constitutive relation essentially belongs to a system of ordinary differential equations, in most cases it is impossible to obtain an accurate analytical expression of the stress-strain full-scale relationship through direct integration. At present, there are mainly two types of stress integration algorithms in the international scope: one is the implicit integration algorithm based on the concept of back-off mapping, and the other is the explicit integration algorithm based on the multi-step method. The traditional explicit integration algorithm divides the strain increment into pure elastic strain increment and elastic-plastic strain increment through iterative trial calculation, so...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a calculation method of soil state data based on the plasticity model of the boundary surface to solve the problem of low calculation accuracy of the existing plasticity model of the boundary surface

Images