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Deep coal mine roadway grout body maintenance method

A deep mine roadway and grouting technology is applied in the field of grouting body maintenance for deep mine roadways, which can solve the problems of neglecting rock mass strength, delaying production, rework, etc., and achieves the effects of alleviating mining contradictions, saving maintenance costs, and improving strength.

Inactive Publication Date: 2014-12-17
内蒙古煤矿设计研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the grouting of the surrounding rock loose circle is only selected on parameters such as manual material selection, material mix ratio, grouting timing, single hole grouting amount, grouting pressure, and grouting time, and ignores the importance of grouting. Systematic tracking and monitoring of rock mass strength
Therefore, if there is no corresponding maintenance for the grouting body, the grouting body formed by injecting the cement slurry into the surrounding rock loose circle is difficult to achieve the expected strength, so the strength of the support body is lower than the surrounding rock pressure outside the grouting body, causing the grouting If the slurry is fried or cracked, it can only be dealt with by passive grouting and repeated grouting, which will not only cause rework but also delay production

Method used

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  • Deep coal mine roadway grout body maintenance method
  • Deep coal mine roadway grout body maintenance method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example one as figure 1 , figure 2 As shown, the coal mine deep shaft roadway grouting body maintenance method steps of the present embodiment:

[0023] (1) Initial spraying is carried out on the surrounding rock loosening ring 6 surface of the tunneling section of the coal mine deep shaft roadway, forming a shotcrete layer of the initial spraying up to 7 cm; then arranging anchor rods and laying a layer of steel wire mesh on the shotcrete layer of the initial spraying; Carry out re-spraying on steel wire net then, the sprayed grout layer that forms re-spraying reaches 14 centimetres. The shotcrete layer 1 of the surrounding rock loosening ring 6 is composed of the initial shotcrete layer, the steel wire mesh and the resprayed shotcrete layer. The main components of the grout for initial spraying and respraying are mixtures of cement, water, sand and stones, and the weight ratio of cement, water, sand and stones in the mixture of cement, water, sand and stones is 0.8...

Embodiment 2

[0033]The shotcrete layer of embodiment 2 just sprayed reaches 7.5 centimeters; The sprayed grout layer that forms double spray reaches 14.5 centimeters, and the weight ratio of cement, water, sand, stone in the mixture of cement, water, sand, stone is 1: 1: 2 : 2; the vertical spacing and the transverse spacing between the maintenance hole 5 on the surrounding rock loosening ring 6 and the maintenance hole 5 are 2.3 meters; the vertical spacing between the grouting hole 4 and the grouting hole 4 on the surrounding rock loosening ring 6 and The horizontal spacing is 1.5 meters; the grout for the grouting of the surrounding rock loose ring 6 is a mixture of cement and water, and the weight ratio of cement and water is 1:1.9; the curing period is 23 days; other construction methods are the same as those in the examples.

Embodiment 3

[0034] Embodiment 3 The shotcrete layer of just spraying reaches 8 centimeters; The shotcrete layer that forms respray reaches 15 centimeters, and the weight ratio of cement, water, sand, stone in the mixture of cement, water, sand, stone is 1.2: 1.2: 2.2 : 2.2; the longitudinal spacing and the transverse spacing between the maintenance hole 5 on the surrounding rock loosening ring 6 and the maintenance hole 5 are 2.6 meters; the vertical spacing between the grouting hole 4 and the grouting hole 4 on the surrounding rock loosening ring 6 and The horizontal spacing is 1.8 meters; the grout for the grouting of the surrounding rock loose ring 6 is a mixture of cement and water, and the weight ratio of cement and water is 1.2:2; the curing period is 26 days; other construction methods are the same as in the embodiment.

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Abstract

The invention discloses a deep coal mine roadway grout body maintenance method, which relates to the technical field of deep coal mine roadway support construction. The invention solves the problem that at present, the grout body formed by grout poured into the broken surrounding rock zone of a deep coal mine roadway can hardly reach expected strength. The deep coal mine roadway grout body maintenance method includes pre-spouting, anchor bolt arrangement, the laying of a layer of steel wire gauze, re-spouting, seep hole drilling, maintenance hole drilling and grouting hole drilling, water continues to be injected into a maintained layer via the maintenance hole after broken surrounding rock zone grouting is finished, and the maintenance period is 20 to 26 days. By maintaining the grout body, the strength of a roadway support body is greatly enhanced, the maintenance cost is saved, and the contradiction in underground mining is greatly alleviated through the deep coal mine roadway grout body maintenance method.

Description

technical field [0001] The invention relates to a coal mine deep shaft roadway support construction, in particular to a coal mine deep shaft roadway grouting maintenance method. Background technique [0002] Coal is still one of the important energy sources in my country. With the rapid economic development, the demand for coal is increasing. However, the coal resources in the shallow stratum are nearly exhausted. The trend of coal mining is to expand to the deep stratum, and the mining depth has exceeded 1100 meters. In fact, in the shallow part of the formation, it has low confining pressure and normal temperature, and the surrounding rock mass has linear mechanical characteristics. The traditional support technology for the mine roadway can basically meet the construction requirements. After coal mining enters the deep part of the formation, the surrounding rock environment has high ground stress, high ground temperature, high-pressure karst water and high-pressure gas, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D21/00
Inventor 李亮李献德曹晓明
Owner 内蒙古煤矿设计研究院有限责任公司