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Method for examining water blocking effect of cracked surrounding rocks of tunnels after grouting

A test method, tunnel technology, applied in measurement devices, suspension and porous material analysis, instruments, etc., can solve problems such as characteristics that cannot reflect stress redistribution

Active Publication Date: 2016-09-07
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Load conditions cannot reflect the characteristics of stress redistribution after excavation

Method used

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  • Method for examining water blocking effect of cracked surrounding rocks of tunnels after grouting
  • Method for examining water blocking effect of cracked surrounding rocks of tunnels after grouting
  • Method for examining water blocking effect of cracked surrounding rocks of tunnels after grouting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1, such as Figure 1-4 As shown, a test method for testing the water blocking effect of the tunnel ruptured surrounding rock after grouting includes the following steps:

[0036] S1. Carry out circumferential loading on the sample 2 to form cracks on the sample, and record the acoustic emission signal during the loading process;

[0037] S2. Perform pressure grouting on the sample, and record acoustic emission signals during the grouting process;

[0038] S3. Carry out a penetration test on the grouting body after the grouting is consolidated, and record the seepage flow and seepage pressure of the loading end face during the test.

Embodiment 2

[0039] Embodiment 2, on the basis of Embodiment 1, step S1 of the present invention comprises the following steps:

[0040] S11. Seal the front and rear sides of the sample 2 with the front sealing plate 4 and the rear sealing plate 3 respectively, the top of the sample 2 is sealed with the upper sealing plate 5, and the bottom is sealed with the lower sealing plate to keep the left and right sides of the sample loaded The end face is not sealed, and the acoustic emission probe 6 is pasted on the front and rear sides and the top and bottom sides of the sample;

[0041] S12. Place the sample in the loading device, and preload the left and right ends and the front and rear sides of the sample;

[0042] S13. Uniformly load the left and right ends and the front and rear sides of the sample at a loading rate of 0.02MPa / s until the given load, and then continue to load the left and right ends of the sample evenly at a loading rate of 0.02MPa / s until the given load is given. Constan...

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Abstract

The invention relates to a method for examining water blocking effect of cracked surrounding rocks of tunnels after grouting. The method comprises the following steps: step one, subjecting a sample to circumferential loading so as to form cracks in the sample, and recording the acoustic emission signals during the loading process; step two, subjecting the sample to pressure grouting, and recording the acoustic emission signals during the grouting process; step three, after the slurry cures, subjecting the cured slurry to penetration tests, and recording the seepage flow and seepage pressure of loaded end surface during the experiment process. The method can realistically represent the crack growth characteristics of rocks after rupture, and characteristics of stress redistribution after excavation.

Description

technical field [0001] The invention relates to a test method for checking the water-blocking effect after the grouting of the surrounding rock of the ruptured tunnel. Background technique [0002] Deep underground rock mass engineering (such as traffic tunnels, diversion tunnels, coal mine roadways, nuclear waste disposal warehouses, etc.) faces two major problems, namely high ground stress and high groundwater level. The excavation of rock underground engineering breaks the balance state of the stress of the original rock, causing the stress redistribution of the surrounding rock, the tangential stress of the surrounding rock of the cave wall increases, the radial stress decreases, and the increase of the stress difference leads to the rupture of the surrounding rock. The property deteriorates, the permeability increases, and the high osmotic pressure generated by the high groundwater level will further split the rock mass. The high-pressure water will press the oozing roc...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 张传庆崔国建高阳周辉杨凡杰
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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