Grouting reinforcement material HengAn filling I

1、 General situation of HengAn filling I project with grouting reinforcement material
&Nbsp& Nbsp Due to the influence of geological conditions in the mining face of coal mine, the roof fall of the mining face frame occurs, resulting in the inclination of the frame, which affects the safety production of the mining face
At the same time, with the large water inflow of the mining face roof, it brings the risk of secondary disasters to the mining face
The normal safety production of the mine is affected
In order to ensure the safe production and smooth and safe advancement of the mining face, the following objectives and expected effects are to be achieved through chemical grouting reinforcement and filling treatment:
The roof falling area needs to be reinforced by chemical grouting

Strengthen the loose coal falling from the roof
The soft area of the coal seam is reinforced by injecting chemical slurry to prevent potential safety hazards in the later stage
As the water inflow in the caving area is large, which will have an impact on the chemical slurry, the effect will change the parameters such as foaming, compression and shear resistance under the condition of water on site, which will directly affect the use effect of the product

2、 Grouting material
1
Grouting reinforcement material: HengAn reinforcement I
This product is a two-component organic resin material, which is used to strengthen soft and broken rock strata and easy to slice coal wall
After the grouting resin is mixed with low viscosity liquid and injected into the cracks of broken coal and rock mass, it can react and solidify rapidly to produce resin solidified products with high strength and high toughness, so as to realize the reinforcement of broken coal and rock mass and the sealing of cracks

Product features:
High strength: high compressive strength, firm and lasting adhesion to coal seam
High toughness: strong toughness and deformation ability, suitable for rock deformation
Low viscosity: easy to penetrate into micro cracks and flame retardant

Technical indicators:
This product fully meets the index requirements of polymer materials for coal mine reinforcement aq1089-2011 issued by the State Administration of work safety

Scope of application:
Reinforce broken coal and rock mass, loose coal wall, coal pillar, top and bottom plate
Advance reinforcement of heading face
Control mining face
Reinforce the closed wall and surrounding broken bodies, and block the gas drainage and sealing holes of broken coal and rock fissures
See the following table for technical data:
&Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Performance of HengAn reinforced I two-component slurry
Serial number
Item , Item ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Slurry performance
&Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Resin catalyzer
1  Appearance ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Colorless transparent liquid Dark brown oily liquid
2  Slurry density / g / cm3 ,& Nbsp 1
010~1
040  1
220~1
240
3  Initial viscosity / MPA? s & Nbsp& Nbsp& Nbsp 130~260  240~359
4  Mixed volume ratio ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 1  one
5  Reaction start time (20 ℃) S ,& Nbsp& Nbsp& Nbsp 65~90
6  Reaction end time (20 ℃) S ,& Nbsp& Nbsp 110~150
&Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Hengan reinforcement I ,& Nbsp& Nbsp& Nbsp Properties of cured products
Serial number Item ,& Nbsp& Nbsp& Nbsp Item ,& Nbsp& Nbsp Properties of cured products
1  Compressive strength / MPA ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp & ge;& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp sixty
2  Tensile strength / MPA ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp & ge;& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp thirty-five
3  Tensile shear strength / MPA ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp & ge;& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp twelve
4  Bond strength / MPA ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp & ge;& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp four point five
5  Expansion multiple ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp & ge;& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 1
2~2
5
6  Reaction temperature / ℃ ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp & le;& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp one hundred and forty
Note: the test age of the cured product is 24 hours
2
Grouting reinforcement material Heng'an filling I: Heng'an filling I product is an injection product composed of two components, which is used for hollow filling, isolating air and gas and strengthening the stratum with high fracture degree
Injecting Heng An filling I foam uses a pump and a mixing gun
The volume of the catalyst is 4 to 1, and the foam will react quickly
The product will expand to 20~30 times of the original volume
After expansion, the I foam of Heng An is hardened in a few minutes
Its rapid reaction, high expansion rate, good compressive capacity and outstanding antistatic performance can achieve economic, rapid and safe filling effect
With its fire resistance rating, it is suitable for the sealing of underground heat source and the fire prevention of underground mine

&Nbsp Hengan filling I has rapid expansion performance and simple construction
After it is injected into the gap of coal gangue, it will expand rapidly, wrap it and fill the cracks, so as to form a stable artificial false roof on the top
And fill the empty area on the roof to fully connect the roof with the roof, prevent gas gathering and seal the cracks
The technical data of Heng an I foam are shown in the table below:
&Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp
1．  Basic ingredients ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Resin ,& Nbsp& Nbsp& Nbsp catalyzer
&Nbsp Density at 20 ℃ (g / cm3) 1
2 & Nbsp& Nbsp one point five
&Nbsp Storage temperature (℃)  & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 5-20 & Nbsp& Nbsp 5-40
&Nbsp Storage life at 20 ℃ (months) , 3 & Nbsp& Nbsp twelve
2
Polymerization products
  Mixing ratio (volume ratio) ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 4:1
  Reaction time ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 2:00min
  Expansion multiple ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 20-30
  Compressive strength at 10% deformation ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp 100-200kPa
  Flame retardant ,& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp Incombustible
3、 Typical application characteristics of HengAn reinforcement I slurry project
1)  Network skeleton action of slurry consolidated body
After the slurry is squeezed or penetrated into the crisscross cracks of the surrounding rock, it will form a network skeleton structure in the surrounding rock
The slurry consolidated body is in flake or strip shape with different thickness, which can almost connect with each other to form a network skeleton
The consolidated body of HengAn reinforced No
I chemical material and coal body has good toughness and cohesiveness
When the external load increases, the solidified material deforms but does not damage, and the load is mainly borne by the coal and rock mass with higher strength
In this way, the failure condition of surrounding rock is transformed from the original strength condition of weak fracture surface to the strength condition close to coal and rock mass
When the stress of coal and rock mass exceeds the strength of coal and large deformation occurs, the network of consolidated materials plays the role of skeleton with its good toughness and bond strength, improves the residual strength of surrounding rock, limits the expansion of surrounding rock failure, and improves the maintenance condition

2) Role of filling compaction and transformation of surrounding rock failure mechanism
Under the action of pump pressure, the slurry can not only fill some large fractures, but also compress and even close some closed fractures and small fractures that cannot be filled, so as to improve the elastic modulus and strength of surrounding rock

After grouting solidification, the crack is filled with consolidated materials, and the bonding effect of consolidated materials on the crack surface greatly weakens or disappears the stress concentration at the end of the crack, so as to change the failure mechanism of surrounding rock
In addition, when there are large cracks in the surrounding rock and the rock mass near the crack is in the state of two-dimensional stress, when the crack is filled with solidified materials or compacted, it will become the state of three-dimensional stress, and the strength of the rock mass in the state of three-dimensional stress is significantly higher than that in the state of two-dimensional stress, and the brittleness is weakened and the plasticity is enhanced
From the stress state, grouting solidification also plays a role in changing the failure mechanism of rock mass and improving the strength of surrounding rock

3) Improve the strength of surrounding rock
Through grouting, the mechanical properties of weak surface can be changed, that is, the cohesion and internal friction angle between crack and coal and rock mass can be improved, and the resistance of relative displacement between blocks in rock mass can be increased, so as to improve the overall stability of coal and rock mass

4) Form bearing structure
Through grouting reinforcement, the loose coal and rock mass can be cemented into a whole again to form a bearing structure and give full play to the self stability of coal and rock mass

5) Improve the storage environment
The broken coal and rock mass is reinforced by grouting, which improves the overall bearing capacity of the coal and rock mass and improves its overall performance
There is no roof falling phenomenon in the process of advancing the working face

4、 Implementation principle of grouting reinforcement in structural zone
(1) Advance grouting principle
Grouting shall be carried out in advance before the advance of the working face to consolidate the soft and broken coal and rock mass into a whole, so as to ensure that the working face is not easy to fall when passing through the structural belt, and speed up the advance speed of the working face

(2) Principle of uniform grouting
The grouting holes shall be evenly arranged to maximize the uniform penetration of slurry in loose coal and rock mass, so as to achieve the effect of overall reinforcement of coal body