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A Grouting Technology of Rapid Grouting System in Goaf

A technology of grouting system and goaf, which is applied in mining equipment, earthwork drilling, wellbore lining, etc. It can solve the problems of high cost and long construction period, and achieve high pump pressure, large pumping capacity and stable pump pressure. Effect

Active Publication Date: 2018-04-20
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the multi-layer goaf adopts the process of "segmented hole forming and down-going segmented grouting", it is necessary to use a drilling rig to sweep the hole after the grout in the upper goaf is solidified and drill to the treatment position of the goaf in the next layer. Therefore, there are problems of long construction period and high cost

Method used

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  • A Grouting Technology of Rapid Grouting System in Goaf
  • A Grouting Technology of Rapid Grouting System in Goaf
  • A Grouting Technology of Rapid Grouting System in Goaf

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Only one layer of goaf is distributed within the control area. Before mining, the coal seam is 1.5m thick and the buried depth is 80m. After mining, the height of the caving zone is 8m, and the height of the fracture zone is 15m. rock. In this regard, it was decided to adopt the process of "one-time hole forming and full hole grouting". The specific steps are as follows:

[0060] (1) Construction grouting drilling. It includes three steps: fixed point, installation of drilling rig, and hole formation:

[0061] ① fixed point. Use RTK (real-time dynamic carrier phase difference technology) to stake out on the spot according to the drilling design coordinates, and the error should not exceed 10cm.

[0062] ② Install the drilling rig. According to the position of the lofted hole, the construction platform is leveled, and the down-the-hole hammer drilling rig is in place and installed.

[0063] ③ Hole forming. Use the down-the-hole hammer drilling rig to drill, and use...

Embodiment 2

[0072] There are two layers of gobs distributed within the scope of treatment. The first layer of coal is 1.0m thick and buried 50m deep before mining. After mining, the height of the caving zone is 5m and the height of the fracture zone is 7m. The buried depth is 120m, the height of the caving zone after mining is 8m, and the height of the fissure zone is 15m; the thickness of the Quaternary system here is 10m, and the lower part is all bedrock. In this regard, it was decided to adopt the "one-time hole forming, upward segmental grouting" process, and the specific steps are as follows:

[0073] (1) Construction grouting drilling. It includes three steps: fixed point, installation of drilling rig, and hole forming:

[0074] ① fixed point. Use RTK (real-time dynamic carrier phase difference technology) to stake out on the spot according to the drilling design coordinates, and the error should not exceed 10cm.

[0075] ② Install the drilling rig. According to the position of...

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Abstract

The invention discloses a grouting process of a quick grouting system in a goaf. The goaf rapid grouting system includes a slurry making device, a hole washing device, an initial injection device, a reinjection device and a grout level control device. The grouting process is based on the goaf rapid grouting system and adopts the following steps: Construction grouting drilling; Pulp making; hole washing; grouting, the gob area required for each layer needs to go through two processes of initial injection and re-injection; hole sealing. The present invention adopts the process of "one-time hole formation and full hole grouting" for single-layer goafs and "one-time hole formation and upward segmental grouting" for multi-layer goafs. Divided into two stages of initial injection and re-injection, the grouting efficiency is greatly improved on the premise of ensuring the quality of the project.

Description

technical field [0001] The invention relates to the field of goaf grouting, in particular to a grouting process for a gob rapid grouting system. Background technique [0002] With the acceleration of urbanization and industrialization in our country, and the increase in the density of infrastructure construction such as transportation and road networks, the available land resources are decreasing day by day, and many coal mine goafs are gradually listed as industrial and civil construction sites, resulting in some Buildings (structures) such as roads, railways, bridges, tunnel projects, and commercial houses in the region have to be built on the goaf or through the goaf. [0003] Under the disturbance of surface building (structure) loads and other external forces, it is possible to break the relative equilibrium state of the rock mass in the cracked zone, reactivate the goaf, cause stress redistribution, and cause additional movement and deformation of the surface, which in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
Inventor 江宁郭惟嘉常西坤刘占新梁彦波崔博强郭皓白丽扬张鑫庞振忠
Owner SHANDONG UNIV OF SCI & TECH