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

A technology of elastic strain energy and prediction method, which is applied in the field of surrounding rock damage prediction, can solve the problems of reduced accuracy and large dispersion of disturbance parameter D, and achieve the effect of accurate prediction results

Pending Publication Date: 2019-11-05
CHINA THREE GORGES UNIV
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Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a method for predicting the damage range of surrounding rock based on releasable elastic strain energy, which can solve the problem that the accuracy of the disturbance parameter D is g

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

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Embodiment 1

[0043] Tunnel overview: A deep buried tunnel is located in an area where the ground stress is relatively concentrated. The maximum principal stress is about 72Mpa, and the direction is parallel to the axis of the cavern; the minimum principal stress is about 32Mpa, and the direction is vertically downward.

[0044] A method for predicting damage range of surrounding rock based on releasable elastic strain energy, said method comprising the following steps:

[0045] Step 1: According to the blasting design parameters, the excavation site environment and the rock mechanics parameters selected according to the test results, an analysis model of circular tunnel blasting excavation is established. The radius of the circular tunnel in the model is 5.0m, and the blasting load action process and the ground stress transient unloading process are obtained through theoretical analysis, and finally the two action processes are coupled to obtain the ground stress transient unloading and bla...

Embodiment 2

[0076] The reliability of the prediction results is tested by using the range of surrounding rock damage identified by the measured acoustic wave data:

[0077] 5 acoustic detection holes are arranged at the arch waist, vault, and spandrels on both sides of the excavation cross-section of the above-mentioned deep tunnel, marked as 1# acoustic wave hole measured in surrounding rock, 2# acoustic wave hole measured in surrounding rock...5# The acoustic hole in the surrounding rock is actually measured; the detection hole diameter is 0.07m, and the hole depth is 10m.

[0078] The test hole is used to test the sound waves of the rock mass after blasting and excavation, and the sound wave velocities at different depths of the holes are obtained. When there are cracks in the surrounding rock, the sound wave velocity will decrease, and when the change rate η of the sound wave velocity is greater than 10%, it is considered that the surrounding rock is damaged; There are no cracks in t...

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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 ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q10/04
CPCG06Q10/04
Inventor 范勇郑军威崔先泽周宜红何卫平王峰
Owner CHINA THREE GORGES UNIV
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