Method using gangue cementation combined with bag grouting to support and reduce loss

A technology of grouting and bagging, which is applied in the direction of earthwork drilling, filling, safety devices, etc., to reduce transportation and use, improve economic benefits, and reduce accidents

Inactive Publication Date: 2020-10-02
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0004] In the prior art, for the traditional roof-cutting and pressure-relief goaf caving full-section filling method, there are few methods for supporting the broken gangue by interval grouting when using the goaf caving and bulging filling method; at the same time For the traditional grouting construction method, the ...

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  • Method using gangue cementation combined with bag grouting to support and reduce loss
  • Method using gangue cementation combined with bag grouting to support and reduce loss
  • Method using gangue cementation combined with bag grouting to support and reduce loss

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[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0030]Any feature disclosed in this specification (including any appended claims, abstract), unless otherwise stated, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right" etc. is based on the orientation or positional relationship shown in the drawings, and is only for It is convenient to describe the present invention and simplify the description, but not to indicate or imply that the device or element referred to must have a specific orientation, be const...

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Abstract

The invention discloses a method using gangue cementation combined with bag grouting to support and reduce loss. The method using the gangue cementation combined with bag grouting to support and reduce the loss is suitable for a goaf with natural roof collapse and incomplete filling of a broken body after mining a thin and medium thick coal seam. Firstly, downhole oblique upward directional drilling is adopted to the upper part of a caving belt, and then a PVC casing pipe and a grouting pipe are arranged; local jet grouting is carried out on caved and broken overlying strata with a spherical nozzle, and the grouting quantity and pressure are separately controlled according to a grouting flowmeter and a pressure gauge to achieve the goal of controlling the shape and size of a crushed rock cement body; and then a bag is placed on the upper part of a gangue cement body and grouting and filling are carried out to make the gangue cement body contact a roof plate, and the accurate and real-time monitoring of the expansion volume of the bag is realized through the grouting pressure gauge and the flowmeter to ensure that the effective support is formed between the bag grouting and the cemented gangue broken body.

Description

technical field [0001] The invention relates to a combined supporting and reducing method using gangue cementation and pocket grouting, and relates to the technical field of coal mining. Background technique [0002] In my country's energy structure, coal has always occupied an important position, and a large number of coal mining has also brought many problems. With the development of mining activities, the surface morphology and ecological environment of the mining area have been seriously affected. According to relevant data from my country's environmental protection department, the problem of surface subsidence caused by coal mining has become difficult to ignore. Subsidence has occurred in a large number of coal mining areas, and has seriously affected the local ecological environment; The ecological and environmental problems caused by large-scale mining of coal resources are very prominent. According to the investigation and research of the actual mining situation, co...

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Application Information

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IPC IPC(8): E21F15/00
CPCE21F15/005
Inventor 申艳军侯新郝建帅白志鹏袁江强
Owner XIAN UNIV OF SCI & TECH
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