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Fully mechanized coal mining face advanced abutment pressure zone deep-hole grouting material and preparation method

A fully-mechanized mining face and grouting material technology, which is applied in the field of deep-hole grouting materials and its preparation in the advanced bearing pressure area of ​​fully-mechanized mining face, can solve the problems of poor injectability, flammability, and low early strength, and achieve Simplify the preparation and grouting process, improve the injectability and fluidity, and improve the effect of early strength

Active Publication Date: 2016-07-20
河南力行科创矿山技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, ordinary cement and polymer materials are commonly used in engineering. Although ordinary cement grouting materials have abundant sources, low prices, and high durability, they have disadvantages such as large particle size, slow strength growth, poor injectability, and low early strength. ; Although the polymer grouting material has the advantages of strong permeability and fast setting, it has disadvantages such as expensive, toxic and flammable

Method used

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  • Fully mechanized coal mining face advanced abutment pressure zone deep-hole grouting material and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of the deep hole grouting material in the advanced supporting pressure zone of the fully mechanized coal mining face of the present embodiment is as follows:

[0020] Take 100kg of ultra-fine cement, 2kg of early strength agent, 1kg of water reducing agent, and 0.5kg of suspending agent, put them in the mixing equipment and mix for 30min, and mix well; take 50kg of the above-mentioned mixture and put it in a mixer, press 0.6:1 of water Add 30kg of water to the ash ratio and stir for 5-10 minutes to prepare the grouting material; put the mixed slurry in a forming mold, and place the forming material in a standard concrete curing box for curing.

Embodiment 2

[0022] The preparation method of the deep hole grouting material in the advanced supporting pressure zone of the fully mechanized coal mining face of the present embodiment is as follows:

[0023] Take 100kg of ultra-fine cement, 2kg of early strength agent, 0.5kg of water reducing agent, and 1.0kg of suspending agent, put them in the mixing equipment and mix for 30min, and mix well; take 50kg of the above-mentioned mixture and put it in the mixer, according to 0.8:1 Add 40kg of water to the water-cement ratio and stir for 5-10 minutes to prepare the grouting material; put the mixed slurry in a forming mold, and place the forming material in a standard concrete curing box for curing.

Embodiment 3

[0025] The preparation method of the deep-hole grouting material in the advanced supporting pressure zone of the fully mechanized coal mining face of this embodiment is as follows:

[0026] (1) Put 100kg of ultrafine cement, 1.5kg of early strength agent (sodium sulfate), 0.5kg of water reducing agent (naphthalene superplasticizer) and 0.5kg of suspending agent (sodium carboxymethyl cellulose) in the mixture according to the ratio Mix for 20 minutes in the material equipment;

[0027] (2) Take 50kg of the above-mentioned mixture, add 30kg of water according to the water-cement mass ratio of 0.6:1, fully stir in a mixer to obtain early-strength deep-hole grouting material for mines. The initial setting time is greater than 45min, the final setting time is greater than 4h, and the uniaxial compressive strength at 3d age is greater than 20MPa.

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Abstract

The invention relates to the technical field of coal mine deep-hole grouting materials, in particular to a fully mechanized coal mining face advanced abutment pressure zone deep-hole grouting material and a preparation method thereof. The grouting material is prepared from 100 parts of common silicate superfine cement, 1.5-2.5 parts of a complex accelerator, 0.5-1.5 parts of a water reducing agent, and 0.5-1.0 part of a suspending agent, wherein the water-cement ratio is 0.6-0.8-1. The preparation method comprises the steps that the components are weighed and placed into mixing equipment, and mixing is performed for 20-30 min; a mixture is taken and added into water on the basis of the water-cement ratio being 0.6-0.8-1, stirring is performed for 5-10 min and the grouting material is obtained. The grouting material has the advantages of being high in groutability, good in mobility, good in permeability and the like, the strength is rapidly increased after 8 h, the 1d neat paste uniaxial compressive strength can reach 20 MPa or above, the material is quite suitable for implementing grouting on a fully mechanized coal mining face advanced abutment pressure zone, and field application shows that the material has the good generalization.

Description

Technical field [0001] The invention relates to the technical field of deep-hole grouting materials for coal mines, in particular to a deep-hole grouting material for the advanced supporting pressure zone of a fully mechanized coal mining face and a preparation method thereof. Background technique [0002] The advanced supporting pressure of fully mechanized mining face causes coal body and roof to be broken, which is an important cause of coal wall slab and roof fall. At the same time, under the action of advanced supporting pressure of working face, coal and rock seam cracks increase, permeability improves, and injectability increases . Deep-hole grouting in the coal body in the advanced support pressure zone is an effective method to solve the problem of coal slabs in the working face. Therefore, the implementation of grouting in the advanced support pressure zone can not only increase the grouting amount and obtain good grouting effects, but also quickly increase the strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/70
CPCC04B28/04C04B2111/70C04B2103/0068C04B2103/302C04B22/147C04B24/00C04B24/383
Inventor 熊祖强王雨利张耀辉刘旭锋张建锋陈兵洪紫杰李东华袁印
Owner 河南力行科创矿山技术开发有限公司
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