Anhydrite tunnel simulation method and device considering expansion evolution

Abstract

The invention provides an anhydrite tunnel simulation method and device considering expansion evolution, and the method comprises the steps: carrying out an expansion test under the action of pressurewater, and obtaining a first-order derivative function of water absorption and water pressure; introducing the first-order derivative function into a seepage differential equation, and establishing awater absorption-expansion evolution model in a seepage field; establishing a corresponding relationship between the thermal analysis model and a water absorption-expansion evolution model in the seepage field; utilizing the specific water volume, the relative density of the rock relative to water, the expansion stress, the elastic modulus of the material, the expansion modulus of the anhydrite,the expansion coefficient in the thermal analysis model and the actual expansion coefficient of the anhydrite; converting specific values of a heat conductivity coefficient, a boundary temperature ora heat flux, and expressions of a specific heat capacity and a thermal expansion coefficient in the thermal analysis model; and establishing a general calculation process, simulating a process of changing surrounding rock deformation and support stress along with time under the action of seepage and water absorption-expansion evolution by utilizing the general calculation process, and outputting asimulation result.

Description

technical field [0001] The invention relates to the technical field of tunnel simulation, in particular to an anhydrite tunnel simulation method and device considering expansion evolution. Background technique [0002] Seepage movement has a significant impact on the stability and deformation characteristics of expansive rock tunnels. Compared with other expansive rocks, the impact of seepage process on anhydrite tunnel is more obvious, which is reflected in two typical characteristics of anhydrite tunnel: long expansion time (including seepage time and water absorption time) and no obvious stable expansion pressure (Seepage causes water uptake to change over time). In engineering, the expansion force of a rock specimen is often obtained through laboratory tests, and it is used as a fixed input parameter to simulate the deformation characteristics of the expansion rock tunnel. [0003] However, in existing projects, the expansion force of a rock specimen is often obtained ...

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Problems solved by technology

[0003] However, in existing projects, the expansion force of a rock specimen is often obtained through laboratory tests, and it is used as an input parameter to simulate the deformation characteristics of expansive rock tunnels, which cannot reflect the influence of seepage on expansive rocks, let alone reflect the Evolution and spatial distribution characteristics of tunnel anhydrite surrounding rock expansion

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