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Method for estimating porosity of granite surrounding rock after high temperature based on longitudinal wave velocity

A technology of longitudinal wave velocity and porosity, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, evaluate water resources, and process detection response signals. It can solve the inconvenient porosity state evaluation, large number of test samples, and measurement cycle Long-term problems, to achieve the effect of shortening the process of indoor testing, saving testing time, and saving costs

Active Publication Date: 2020-07-24
BEIJING UNIV OF TECH
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Problems solved by technology

In the actual post-fire rock mass engineering safety evaluation work, the number of test samples is large, the price is expensive, and the measurement cycle is long, which is not convenient for the evaluation of the overall porosity state of the surrounding rock

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  • Method for estimating porosity of granite surrounding rock after high temperature based on longitudinal wave velocity
  • Method for estimating porosity of granite surrounding rock after high temperature based on longitudinal wave velocity
  • Method for estimating porosity of granite surrounding rock after high temperature based on longitudinal wave velocity

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Embodiment Construction

[0038] The method of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0039] A method for estimating the porosity of granite surrounding rocks after high temperature based on longitudinal wave velocity. The steps of the method are as follows:

[0040] S1, choose Boltzmann function

[0041] The Boltzmann function can well express the relationship between the elastic wave velocity and porosity of granite after high temperature. figure 1 In order to use the Boltzmann function to fit the existing experimental data, Table 1 shows the correlation fitting coefficient, the correlation coefficient R 2 The accuracy of the response fitting is determined by R 2 > It can be seen that the degree of fit is high at 0.9, and it is feasible to use Boltzmann function.

[0042] Table 1 Correlation fitting coefficient

[0043]

[0044] The formula for the relationship between the porosity of granite after high temperature and the longitudinal wave v...

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Abstract

The invention discloses a method for estimating porosity of granite surrounding rock after high temperature based on longitudinal wave velocity. The method comprises the following steps: firstly, establishing a relationship between porosity and elastic wave longitudinal wave velocity based on a Boltzmann function, then selecting representative test points to manufacture a granite sample, performing laboratory test, testing elastic wave longitudinal wave velocity and porosity, finally, testing elastic wave longitudinal wave velocity of the granite surrounding rock on site, substituting the velocity into the relational expression of the granite surrounding rock porosity and the longitudinal wave velocity, and estimating porosity of the surrounding rock. The method establishes a relation formula of granite surrounding rock porosity and the elastic wave longitudinal wave velocity based on the Boltzmann function, and a method for estimating the surrounding rock porosity by testing the granite surrounding rock elastic wave longitudinal wave velocity is created; and in actual engineering, the process of carrying out the surrounding rock porosity laboratory test is shortened, and the timeof the surrounding rock porosity test is greatly saved.

Description

Technical field [0001] The invention belongs to the technical field of rock physics research, and relates to a method for predicting the porosity of granite surrounding rocks, in particular to a method for predicting the porosity of granite surrounding rocks after high temperature based on longitudinal wave velocity. Background technique [0002] When a rock mass project, such as a tunnel project, suffers a fire, the strength and stability of the surrounding rock is greatly reduced. The reason is that the high temperature caused by the fire will induce the surrounding rock to crack and cause the rock performance to deteriorate. Understanding the cracking degree of surrounding rock after high temperature is of utmost importance for the safety assessment, reinforcement and repair of rock mass engineering after disaster. [0003] Porosity is an important index to describe the cracking degree of surrounding rock. At present, the methods for measuring the porosity of surrounding rocks ...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N29/07G01N29/44G01V1/30
CPCG01N15/088G01N29/07G01N29/44G01V1/306G01N2291/0232G01N2291/0421Y02A90/30
Inventor 范立峰樊一丁高经纬杜修力席岩
Owner BEIJING UNIV OF TECH
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