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Rock burst fragment ejection speed predicting method based on releasable elastic strain energy

A technology for elastic strain energy and velocity prediction, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as difficulty in grasping accuracy and reliability

Active Publication Date: 2017-01-11
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for predicting the ejection velocity of rockburst fragments based on releasable elastic strain energy, which can solve the problem that the accuracy and reliability of the existing stress model prediction method are difficult to grasp, and improve the depth The prediction accuracy of the ejection velocity of rockburst fragments during the excavation of buried tunnels has a wider scope of application

Method used

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  • Rock burst fragment ejection speed predicting method based on releasable elastic strain energy
  • Rock burst fragment ejection speed predicting method based on releasable elastic strain energy
  • Rock burst fragment ejection speed predicting method based on releasable elastic strain energy

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Embodiment 1

[0051] Project Overview:

[0052] Excavate a circular tunnel (with the characteristics of large buried depth and high ground stress) in a certain area, the radius of the tunnel is R=5m, and the excavation footage is L e =3m, the initial stress value P at the tunnel 0 =30MPa, rock mass elastic modulus E=20GPa, Poisson's ratio ν=0.22, density ρ=2500kg / m 3 , compressive strength σ c =80MPa, initial microcrack length 2a=0.004m, K Ιc = σ c / 82.

[0053] A method for predicting the ejection velocity of rockburst fragments based on releasable elastic strain energy, the method comprising the following steps:

[0054] Step 1: Based on the initial in-situ stress field and the cross-sectional shape of the tunnel excavation, the surrounding rock stress calculation model is established, such as figure 1 As shown, analyze the stress state of the surrounding rock after excavation, and calculate the elastic strain energy U of the surrounding rock after excavation 1 ,Such as image 3 s...

Embodiment 2

[0080] Figure 4 The average ejection velocity of rockburst fragments actually measured during the blasting and excavation of four different sections (sections A, B, C, D) of the tunnel and the average ejection velocity of rockburst fragments predicted by the existing means and the method of the present invention are given. Ejection speed, from Figure 4 It can be seen from the figure that compared with the existing method for predicting the ejection velocity of rockburst fragments, the method for predicting the ejection velocity of rockburst fragments based on releasable elastic strain energy provided by the present invention, the prediction results are closer to the measured data, and the prediction accuracy higher.

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Abstract

The invention discloses a rock burst fragment ejection speed predicting method based on releasable elastic strain energy. The method comprises the following steps: step 1, calculating elastic strain energy U1 of surrounding rock after excavating; step 2, calculating surrounding rock wing crack expansion energy consumption Ut and friction energy consumption Wf on a main crack surface; step 3, deducting energy consumption value Ud in a surrounding rock cracking process in surrounding rock strain energy density U1 to obtain releasable elastic strain energy Ue of the cracked surrounding rock, and calculating residual elastic energy Qe in a cracked area of the cracked surrounding rock under induction of excavating and unloading if assuming that tunnel excavating footage as Le; and step 4, converting the residual elastic energy Qe of the rock into rock fragment ejection kinetic energy E to obtain average ejection speed v of the rock burst fragments. Through the rock burst fragment ejection speed predicting method based on releasable elastic strain energy, the problem that the accuracy and the reliability of the existing stress model predicting method are difficult to grasp can be solved; the predicting accuracy of the rock burse fragment ejection speed in the excavating process of deeply buried tunnels is improved.

Description

technical field [0001] The invention relates to a method for predicting the ejection velocity of rockburst fragments based on releasable elastic strain energy. Background technique [0002] In recent years, with the rapid development of my country's economy and the great progress of modern construction technology, underground projects such as mining projects, underground caverns of hydropower stations, tunnel projects, and nuclear waste storage bases have gradually developed in depth. In the environment of large burial depth and high ground stress, hard and brittle rock mass often has large elastic strain energy. During blasting and excavation, stress concentration will occur in surrounding rock, and it will also experience the process of energy accumulation, dissipation and release. When the elastic strain energy accumulated by the rock mass exceeds the limit storage energy of the rock mass, part of the rock mass at the cave wall will be blasted loose, spalled, ejected or e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 范勇王奋周宜红赵春菊江璐
Owner CHINA THREE GORGES UNIV
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