Method and system for detecting permeation grouting filling effect of fractured rock core

A detection method and grouting technology, which can be used in measuring devices, instruments, and analysis using nuclear magnetic resonance, etc., can solve problems such as the effect is not intuitive enough.

Active Publication Date: 2021-06-11
WUHAN UNIV
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  • Application Information

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Problems solved by technology

[0003] At present, commonly used grouting effect detection methods include drilling water injection test comparison method, electrical detec

Method used

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  • Method and system for detecting permeation grouting filling effect of fractured rock core
  • Method and system for detecting permeation grouting filling effect of fractured rock core
  • Method and system for detecting permeation grouting filling effect of fractured rock core

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Embodiment Construction

[0061] The specific implementations of the method and system for detecting the filling effect of fissure core infiltration and grouting according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0062]

[0063] The tunnels along the Sichuan-Tibet Railway project pass through a large number of weak and broken sandstone surrounding rocks, and the surrounding rocks are affected by high ground stress and high ground temperature. In this example, the standard cylindrical sandstone samples in this section are selected for grouting test and filling Quantitative detection and evaluation of the effect, so as to guide the on-site grouting project. The experimental confining pressure is 5MPa, the experimental temperature is 30°C, and the experimental grouting pressure variables are 0.5MPa, 1.0MPa, and 1.3MPa.

[0064] like figure 1 As shown, the method for detecting the filling effect of fissure core infiltration and grouting ...

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Abstract

The invention provides a method and system for detecting the permeation grouting filling effect of a fractured rock core. The method comprises the steps of obtaining a columnar rock core sample of a rock mass to be detected for cutting; carrying out vacuumizing water saturation treatment on the sample to obtain a water-saturated sample; wiping off water on the surface of the water-saturated sample, then carrying out nuclear magnetic resonance sampling, measuring a T2 spectrum distribution curve graph of the water-saturated sample, and calculating to obtain a nuclear magnetic semaphore of the water-saturated sample; performing drying treatment on the sample; performing a grouting test on the dried sample; performing nuclear magnetic sampling on the sample to obtain a T2 spectrum distribution curve graph of the sample at different moments in the grouting process and a distribution position image of a slurry frontal surface in the sample; according to the T2 spectrum distribution curve graph, obtaining the effective grouting volume ratio of the grout at different moments; according to the distribution position image of the slurry frontal surface in the sample, obtaining the distance between the slurry frontal surface and the grouting end surface, and calculating the effective grouting length ratio of permeation grouting of the sample at each moment; and calculating to obtain the grouting filling rate.

Description

technical field [0001] The invention belongs to the technical field of roadbed soil improvement, and in particular relates to a method and a system for detecting the filling effect of fissure core seepage grouting. Background technique [0002] As underground engineering gradually extends to complex geological environments, grouting technology also needs to be continuously developed. As a common reinforcement method, grouting technology mainly uses cement-based grout or chemical grout to fill the cracks in the extruded rock mass, increase the compactness of the rock mass after solidification, and cement the original rock mass with cracks into a whole. It has the characteristics of strong practicability and wide application range. Grouting is a concealed project, coupled with the invisible characteristics of rock mass, it is difficult to evaluate the real-time quantitative evaluation of rock mass grouting filling effect. The effect of grouting reinforcement is also closely ...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 吴志军张锶浪翁磊
Owner WUHAN UNIV
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