Surrounding rock damage range prediction method based on releasable elastic strain energy

Abstract

The invention discloses a surrounding rock damage range prediction method based on releasable elastic strain energy, and the method comprises the following steps: 1, building a circular tunnel blasting excavation analysis model, and obtaining a ground stress transient unloading and blasting load coupling action process; 2, calculating the surrounding rock strain energy change process under the coupling effect of ground stress transient unloading and blasting load; 3, introducing a damage coefficient xi, establishing a rock mass unit damage criterion based on releasable elastic strain energy; and establishing a relationship between the distance from the surrounding rock to the center of the excavation section and the dynamic fluctuation peak value of the surrounding rock strain energy, andsubstituting the fluctuation peak values of the surrounding rock strain energy at different surrounding rock radiuses and corresponding stress fields into a newly established damage criterion for judgment and calculation to complete prediction of the surrounding rock damage range. According to the surrounding rock damage range prediction method based on the releasable elastic strain energy, the problem that the accuracy is reduced due to the fact that the discreteness of the disturbance parameter D is very large when the disturbance parameter D is evaluated can be solved, and the prediction result is more accurate.

Description

technical field

[0001] The invention relates to the field of surrounding rock damage prediction induced by excavation and unloading of underground deep tunnels, in particular to a method for predicting surrounding rock damage range based on releasable elastic strain energy. Background technique

[0002] With the increasing population density and the continuous advancement of science and technology, surface resources are no longer sufficient to meet people's demand for resources. More and more engineering constructions are going deep underground, and the high ground stress caused by high buried depths seriously threatens excavation. The safety and stability of the rock mass near the excavation face of the underground cavern. When the rock mass is in the environment of large burial depth and high ground stress, its strain energy reserves are often very high, and a new free face is formed after blasting unloading, and the retained rock mass on the free face The dynamic stress ...

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