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Method for determining optimal grouting timing of bolt grouting support in laboratory

A laboratory and grouting technology, applied in underground chambers, bolt installation, earthwork drilling, etc., can solve problems such as poor field operability and lack of theoretical basis for grouting timing, and achieve clear thinking, significant guiding significance, Actionable effect

Active Publication Date: 2018-09-07
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first three methods mentioned above lack the necessary theoretical basis for the selection of grouting timing, and they are quite blind; while the last method requires the use of numerical simulation methods, which has poor field operability, and the results of numerical simulation research are often inconsistent with the actual situation. have certain differences

Method used

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  • Method for determining optimal grouting timing of bolt grouting support in laboratory
  • Method for determining optimal grouting timing of bolt grouting support in laboratory
  • Method for determining optimal grouting timing of bolt grouting support in laboratory

Examples

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Embodiment 1

[0022] As shown in the figure, the method for determining the optimum grouting timing for anchoring and grouting support in the laboratory of the present invention includes the following steps:

[0023] Step 1): Collect the rock samples of the roadway surrounding rock in the coal mine, seal them with plastic wrap and transport them to the laboratory, cut the collected samples in the laboratory, and process them into cube rock samples with a size of 100mm×100mm×100mm6 (See figure 1 ); the cube rock sample 6 is placed in a cube container surrounded by six pressure plates 4, wherein a vertical pressure head 1 is arranged above the top pressure plate 4, and a horizontal pressure head 2 is arranged outside the pressure plate 4 on the left side; Reaction walls 5 are arranged on the outside of the bottom pressing plate 4, and sealing gaskets 7 are arranged at the joints of each pressing plate 4; and the top pressing plate 4 is provided with a slurry inlet 3, and a permeable plate is ...

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Abstract

The invention relates to a method for determining an optimal grouting timing of bolt grouting support in a laboratory. The method is based on a variation law between the degree of crack development inside rock and the strength of a grouting consolidation body, the relation curve between the grouting timing and the uniaxial compressive strength of a grouted specimen is obtained through a biaxial rheology and grouting coupling test, and then the optimal grouting time is obtained. The method breaks through the bottleneck of the grouting timing determined by experience in a traditional bolt grouting support design, and realizes the scientific and reasonable determination of the optimal grouting timing of the bolt grouting support; and the method has clear ideas, the theoretical basis is reasonable, the operability is high, an important method is provided for the grouting timing of bolt grouting support in coal mine roadway, and the guiding significance is significant.

Description

technical field [0001] The invention relates to a method for determining the timing of grouting for anchoring and supporting, in particular to a method for determining the best timing for grouting for anchoring and supporting surrounding rock of a coal mine roadway in a laboratory, and belongs to the field of supporting for coal mine roadways. Background technique [0002] Bolt-grouting support is a joint support method combining bolt support and grouting reinforcement. Based on the active support principle of bolt, it realizes the integration of anchor and injection, which enhances the effect of bolt support and improves the surrounding area. The integrity of the rock significantly improves the strength and bearing capacity of the surrounding rock. A large number of practices have shown that anchoring and grouting support has a good control effect on the rheological and large deformation of soft rock roadways, and has been widely used and promoted. [0003] The timing of g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D20/02E21D11/10G06Q50/02
CPCE21D11/10E21D20/02G06Q50/02
Inventor 蒋邦友谭云亮顾士坦张广超刘政魏宝贞丁可
Owner SHANDONG UNIV OF SCI & TECH
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