CN110118852A - A kind of macromolecule injecting paste material slip casting effect evaluation method and injecting paste material - Google Patents
A kind of macromolecule injecting paste material slip casting effect evaluation method and injecting paste material Download PDFInfo
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Abstract
The invention discloses a kind of macromolecule injecting paste material slip casting effect evaluation method and injecting paste materials, it is mainly comparison with the cement injection material of grouting parameter relative maturity, by comparing pack completeness, selects the grouting parameter with macromolecule injecting paste material.The macromolecule injecting paste material of offer includes two component of A, B, and component A is made of isocyanates, foaming agent, foam stabilizer, antistatic agent and epoxy resin and epoxy resin prepolymer diluent；B component is made of phosphoric acid, citric acid, polyalcohol, water-soluble trihydroxy polyethers, curing agent, fire retardant and plasticiser.Using evaluation method of the present invention, grouting parameter can be optimized, in anchor bolt construction process, the slip casting time is shortened, injecting paste material is saved, filling effect is good, can safe and efficient enhancing country rock self-bearing capacity, to grouting cable anchor apply high pretightening force, improve the supporting intensity of country rock.
Description
Technical field
The present invention relates to technical field of coal mine more particularly to a kind of macromolecule injecting paste material detection of grouting effects methods.
Background technique
As mining extends to deep, roadway surrounding rock pressure also with increase, conventional support pattern cannot it is weak to country rock,
Broken tunnel forms effective control, influences the stability and safety in tunnel.Grouted anchor bar (rope) merges anchoring support skill
Art and grouting reinforcement technique, are greatly improved Surrounding Rock Strength and self-bearing ability, can effectively control weak surrounding rock, keep tunnel steady
It is fixed.But after being had the following deficiencies: after slip casting first is that conventional anchor pole (rope) slip casting is long there are the construction time, intensity is low and slip casting
There are problems that gap, breaking surrounding rock can not effectively be reinforced；Second is that when using anchor pole (rope) grouting support, Anchor Agent with
There are crack, anchor forces not can guarantee for surrounding fractured rock, cannot make full use of the mechanical property of anchor pole (rope)；Third is that using normal
After anchor pole (rope) slip casting of rule, after grouting serous fluid injects country rock, it is easy to happen spillage phenomenon, breaking surrounding rock not can be carried out effective branch
Shield.
, there is the macromolecule slip casting of antiseepage good leak-proof effect at present in defect when in order to overcome traditional injecting paste material to use
Material, such as epoxy resin, acrylic amide, methyl acrylic ester, lignin class, polyurethanes, Lauxite class and third
Olefin(e) acid salt etc..Macromolecule injecting paste material can carry out effective support to country rock, but for brand-new material, due to grouting parameter
Without reference to value, well operations work is caused to lack operation foundation, grouting parameter blindly can only be set according to the experience of oneself, it can not
Guarantee whether the grouting parameter of selection meets supporting requirement.
Summary of the invention
The purpose of the present invention is to solve disadvantages existing in the prior art, and a kind of macromolecule injecting paste material proposed
The evaluation method of slip casting effect.
Present invention simultaneously provides the macromolecule injecting paste materials for this method.
To achieve the goals above, present invention employs following technical solutions:
A kind of macromolecule injecting paste material slip casting effect evaluation method, comprising the following steps:
S1, under same geological conditions, two groups of multiple rows of drillings of constructing respectively, wherein one group be used as test group, another group
As a control group, control group drilling is known as the drilling of A class, and test group drilling is known as the drilling of B class, and the number of rows of every group of drilling, drilling are deep
Degree is identical with diameter, and drilling array pitch is 5m；
S2, injection has the cement injection material of technology maturation to add grouting cable anchor or anchor pole in the drilling of A class, drills in B class
Injection has macromolecule injecting paste material to add anchor slip casting rope or anchor pole；
S3 after grouting serous fluid solidification hole to be drilled, carries out drilling in the position apart from each drilling different distance and pries through, pry through
Slurries in each drilling are averaged by the slurries in each drilling in the pack completeness of different location in the pack completeness of different location
Value, to obtain two class of A, B drilling slurries in the pack completeness of different location；
S4, the filling by two class of A, B pried through drilling slurries in different location obtain weighting using weighted mean method
Value is referred to as to obtain slurries pack completeness comprehensive evaluation value in the drilling of two class of A, B, and cement injection material filling rate is comprehensive
Evaluation of estimate a and macromolecule injecting paste material pack completeness comprehensive evaluation value b；
S5 compares a and b value size, as a≤b, illustrates the slip casting effect of macromolecule injecting paste material not less than cement injection
The slip casting effect of material, supporting effect are also strong to surrounding rock consolidation；As a ﹥ b, illustrate the slip casting effect of macromolecule injecting paste material
Fruit is poorer than the slip casting effect of cement injection material, adjusts the grouting parameter of macromolecule injecting paste material at this time, reappraises, until a
≤ b, to obtain the grouting parameter of macromolecule injecting paste material.
Present invention drilling Peep Technology is existing mature technology, and equipment generally uses inspection instrument for borehole, and distance is pried through in drilling
The distance of drilling is that those skilled in the art voluntarily choose according to actual condition of mines and experience.
The macromolecule injecting paste material that the present invention is suitable for above-mentioned evaluation method includes two component of A, B；
Component A is composed of the following raw materials in parts by weight: 120-140 parts of isocyanates, 20-40 parts of foaming agent, foam stabilizer 10-
30 parts, 8-10 parts of antistatic agent, 10-30 parts of epoxy resin, 8-10 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the lemon that 0-60 parts of the phosphatase 24 that concentration is 85wt%, concentration are 65%
30-50 parts of lemon acid, 20-40 parts of polyalcohol, water-soluble 10-30 parts of trihydroxy polyethers, 6-8 parts of curing agent, 7-9 parts of fire retardant, modeling
5-7 parts of agent.
The component A: the volume ratio of B component is 1.5:1.
Preferably, component A is composed of the following raw materials in parts by weight: 125-135 parts of isocyanates, 25-35 parts of foaming agent,
15-25 parts of foam stabilizer, 8.5-9.5 parts of antistatic agent, 15-25 parts of epoxy resin, epoxy resin prepolymer diluent 8.5-9.5
Part；
B component is composed of the following raw materials in parts by weight: the lemon that 5-55 parts of the phosphatase 24 that concentration is 85%, concentration are 65%
35-45 parts sour, 25-35 parts of polyalcohol, water-soluble 15-25 parts of trihydroxy polyethers, 6.5-7.5 parts of curing agent, fire retardant 7.5-
8.5 parts, 5.5-6.5 parts of plasticiser.
Preferably, component A is composed of the following raw materials in parts by weight: 130 parts of isocyanates, 30 parts of foaming agent, foam stabilizer 20
Part, 9 parts of antistatic agent, 20 parts of epoxy resin, 9 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the citric acid 40 that 50 parts of the phosphoric acid that concentration is 85%, concentration are 65%
Part, 30 parts of polyalcohol, water-soluble 20 parts of trihydroxy polyethers, 7 parts of curing agent, 8 parts of fire retardant, 6 parts of plasticiser.
Preferably, the isocyanates, foaming agent, foam stabilizer weight ratio be 125-135:25-35:15-25.
Preferably, concentration is 85% phosphoric acid, the citric acid that concentration is 65%, polyalcohol weight ratio be 45-55:35-
45:25-35 parts.
Preferably, the water-soluble trihydroxy polyethers, curing agent, fire retardant weight ratio be 15-25:6.5-7.5:
7.5-8.5 part.
Preferably, the isocyanates is toluene di-isocyanate(TDI), dicyclohexyl methyl hydride diisocyanate, isophorone two
At least one of isocyanates.
Preferably, the polyalcohol is at least one of trimethylolethane, pentaerythrite.
Preferably, o-tolyl glycidol ether can be selected in epoxy resin prepolymer diluent, and chemical resistance is preferable, special
Other diluents are not substantially better than in solvent resistance and water resistance.
The concentration of phosphoric acid and citric acid refers both to mass percent concentration in the present invention.
The application method of macromolecule injecting paste material of the present invention are as follows: component A, B component each ingredient by be mixed after at
For the liquid of both of which phase, component A and B component pass through biliquid pump mixed perfusion to armature boring position by volume 1.5:1 when use
It sets.
Beneficial effects of the present invention:
1, using evaluation method of the present invention, grouting parameter is optimized, in anchor pole (rope) work progress, when shortening slip casting
Between, injecting paste material is saved, filling effect is good.Can safe and efficient enhancing country rock self-bearing capacity, to grouting cable anchor apply
High pretightening force improves the supporting intensity of country rock.
2, the present invention is carried out by setting using epoxy group, the base polyurethane prepolymer for use as formed with isocyanates and polyalcohol
Copolymerization, compression strength and bending strength after improving injecting paste material hardening, after solidifying polyurethane reaction, intermolecular distance increases
Greatly, thermal diffusivity is improved, and reacts the heat released and is dispersed dilution, heat is difficult to accumulate, to reduce polyurethane
Core temperature when material reaction solidifies, and fire retardant is added, fire retardancy is improved, curing agent is added, improves solidification rate,
Anchor bolt construction process shortens the slip casting time, saves injecting paste material, and filling effect is good.Can safe and efficient enhancing country rock from
Body bearing capacity applies high pretightening force to grouting cable anchor, improves the supporting intensity of country rock.
Detailed description of the invention
Fig. 1 is the flow diagram of the effect detection method of macromolecule injecting paste material proposed by the present invention；
Fig. 2 is common injecting paste material+anchor pole (rope) grouting and reinforcing schematic diagram；
Fig. 3 is macromolecule injecting paste material proposed by the present invention+anchor pole (rope) grouting and reinforcing schematic diagram；
Fig. 4 a and Fig. 4 b are respectively that injecting paste material+anchor pole (rope) grouting and reinforcing pries through figure, and Fig. 4 a reflection is in terms of drilling side
The case where, Fig. 4 b reflects the case where just seeing from drilling.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Macromolecule injecting paste material detection of grouting effects method of the present invention, includes the following steps (referring to Fig.1):
S1 carries out two groups of drillings of injection, wherein one group of drilling is as a control group in the case where geological conditions variation is little
Referred to as A class drills, and another group of drilling is known as B class as test group of the invention, and drilling depth is 4m, and bore diameter is
32mm.For the ease of statement, embodiment by taking every group of three row hole drillings as an example, drill array pitch 5m, three row hole drilling of A class number be A1, A2,
Three row hole drilling of A3, B class number is B1, B2, B3；
S2 adds grouting cable anchor (referring to Fig. 2) in A1, A2, A3 drilling injection cement injection material, and grouting parameter is empirically
Value；There is macromolecule injecting paste material to add grouting cable anchor (referring to Fig. 3) in B1, B2, B3 drilling injection, grouting parameter is previously set one
It is a；
S3, referring to Fig. 4 a and Fig. 4 b, after grout cures in number A class and the drilling of B class, drilling in successively distance A1 is
The drilling of S1, S2, S3 remote three positions difference injection depth 4m, diameter 32mm, then lead in three position drillings respectively
Cross drilling pry through imaging technique obtain A1 drilling in slurries three positions pack completeness；Similarly, it is in successively distance A2 drilling
The drilling of S1, S2, S3 remote three positions difference injection depth 4m, diameter 32mm, pry through imaging technique side with same drilling
Method obtain A2 drilling in slurries three positions pack completeness；And so on, obtain in A3, B1, B2, B3 slurries distance S1,
The pack completeness of three S2, S3 remote positions；When the present invention is pried through using drilling, carried out three times apart from inlet well different distance
Drilling is pried through, it is therefore an objective to which the slurries more in each drilling of actual response fill situation；
In the present embodiment:
Pack completeness of A1, A2, A3 drilling slurries in the position S1 is indicated with a11, a12, a13 respectively, is averaged with a1 table
Show, to obtain pack completeness of the slurries in the position S1 of A class drilling；
Pack completeness of A1, A2, A3 drilling slurries in the position S2 is indicated with a21, a22, a23 respectively, is averaged with a2 table
Show, to obtain pack completeness of the slurries in the position S2 of A class drilling；
Pack completeness of A1, A2, A3 drilling slurries in the position S3 is indicated with a31, a32, a33 respectively, is averaged with a3 table
Show, to obtain pack completeness of the slurries in the position S3 of A class drilling；
Pack completeness of B1, B2, B3 drilling slurries in the position S1 is indicated with b11, b12, b13 respectively, is averaged with b1 table
Show, to obtain pack completeness of the slurries in the position S1 of B class drilling；
Pack completeness of B1, B2, B3 drilling slurries in the position S2 is indicated with b21, b22, b23 respectively, is averaged with b2 table
Show, to obtain B class drilling slurries in the pack completeness of the position S2；
Pack completeness of B1, B2, B3 drilling slurries in the position S3 is indicated with b31, b32, b33 respectively, is averaged with b3 table
Show, to obtain pack completeness of the slurries in the position S3 of B class drilling；
S4, pack completeness a1, a2, the a3 of the slurries that A class is drilled in the position S1, S2, S3 use calculated with weighted average method, obtain
To A class drilling slurries pack completeness effect comprehensive evaluation value a；Pack completeness of the slurries that similarly B class is drilled in the position S1, S2, S3
B1, b2, b3 use calculated with weighted average method, obtain B class drilling slurries pack completeness effect comprehensive evaluation value b；That is:
A=e1a1+e2a2+e3a3；
B=f1b1+f2b2+f3b3；
Above-mentioned e1, e2, e3, f1, f2, f3 are weighting coefficient, and e1+e2+e3=1, f1+f2+f3=1.
The weighted mean method that the present invention refers to is prior art, and weighting coefficient is by those skilled in the art according to construction site
Situation simultaneously considers the significance level of three positions S1, S2, S3 to determine.
S5 compares A class drilling slurries pack completeness effect comprehensive evaluation value a and B class drilling slurries pack completeness effect synthesis and comments
It is worth b, the slip casting effect of sealing material of the present invention is evaluated according to comparison result.Specifically:
As a≤b, illustrate macromolecule sealing material slip casting effect of the present invention no less than traditional cement injection material slip casting
Effect meets the requirements to surrounding rock consolidation；
As a ﹥ b, illustrate that macromolecule sealing material slip casting effect of the present invention is poorer than common injecting paste material slip casting effect, at this time
The grouting parameter for adjusting macromolecule sealing material of the present invention is reappraised according to the construction process of Fig. 1, until a≤b, determines high
The parameter of molecule sealing material.
Combined with specific embodiments below injecting paste material of the present invention is made further to explain.
Embodiment one
A kind of macromolecule injecting paste material proposed by the present invention, macromolecule injecting paste material include two component of A, B；
Component A is composed of the following raw materials in parts by weight: 120 parts of isocyanates, 20 parts of foaming agent, 10 parts of foam stabilizer, resist it is quiet
8 parts of electric agent, 10 parts of epoxy resin, 8 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the citric acid 30 that 0 part of the phosphatase 24 that concentration is 85%, concentration are 65%
Part, 20 parts of polyalcohol, water-soluble 10 parts of trihydroxy polyethers, 6 parts of curing agent, 7 parts of fire retardant, 5 parts of plasticiser.
Component A: the volume ratio of B component is 1.5:1.
The invention also provides the application methods of macromolecule injecting paste material are as follows: component A, B component each ingredient pass through mixing
The liquid for becoming both of which phase after stirring, component A and B component pass through biliquid pump mixed perfusion to anchor by volume 1.5:1 when use
Bar drill hole site.
Embodiment two
A kind of macromolecule injecting paste material proposed by the present invention, macromolecule injecting paste material include two component of A, B；
Component A is composed of the following raw materials in parts by weight: 125 parts of isocyanates, 25 parts of foaming agent, 15 parts of foam stabilizer, resist it is quiet
8.5 parts of electric agent, 15 parts of epoxy resin, 8.5 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the citric acid 35 that 5 parts of the phosphatase 24 that concentration is 85%, concentration are 65%
Part, 25 parts of polyalcohol, water-soluble 15 parts of trihydroxy polyethers, 6.5 parts of curing agent, 7.5 parts of fire retardant, 5.5 parts of plasticiser.
Component A: the volume ratio of B component is 1.5:1.
Application method is the same as embodiment one.
Embodiment three
A kind of macromolecule injecting paste material proposed by the present invention, macromolecule injecting paste material include two component of A, B；
Component A is composed of the following raw materials in parts by weight: 130 parts of isocyanates, 30 parts of foaming agent, 20 parts of foam stabilizer, resist it is quiet
9 parts of electric agent, 20 parts of epoxy resin, 9 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the citric acid 40 that 50 parts of the phosphoric acid that concentration is 85%, concentration are 65%
Part, 30 parts of polyalcohol, water-soluble 20 parts of trihydroxy polyethers, 7 parts of curing agent, 8 parts of fire retardant, 6 parts of plasticiser.
Component A: the volume ratio of B component is 1.5:1.
Application method is the same as embodiment one.
Example IV
A kind of macromolecule injecting paste material proposed by the present invention, macromolecule injecting paste material include two component of A, B；
Component A is composed of the following raw materials in parts by weight: 135 parts of isocyanates, 35 parts of foaming agent, 25 parts of foam stabilizer, resist it is quiet
9.5 parts of electric agent, 25 parts of epoxy resin, 9.5 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the citric acid 45 that 55 parts of the phosphoric acid that concentration is 85%, concentration are 65%
Part, 35 parts of polyalcohol, water-soluble 25 parts of trihydroxy polyethers, 7.5 parts of curing agent, 8.5 parts of fire retardant, 6.5 parts of plasticiser.
Component A: the volume ratio of B component is 1.5:1.
Application method is the same as embodiment one.
Embodiment five
A kind of macromolecule injecting paste material proposed by the present invention, macromolecule injecting paste material include two component of A, B；
Component A is composed of the following raw materials in parts by weight: 140 parts of isocyanates, 40 parts of foaming agent, 30 parts of foam stabilizer, resist it is quiet
10 parts of electric agent, 30 parts of epoxy resin, 10 parts of epoxy resin prepolymer diluent；
B component is composed of the following raw materials in parts by weight: the citric acid 50 that 60 parts of the phosphoric acid that concentration is 85%, concentration are 65%
Part, 40 parts of polyalcohol, water-soluble 30 parts of trihydroxy polyethers, 8 parts of curing agent, 9 parts of fire retardant, 7 parts of plasticiser.
Component A: the volume ratio of B component is 1.5:1.
Application method is the same as embodiment one.
It is different that isocyanates of the present invention is selected from toluene di-isocyanate(TDI), dicyclohexyl methyl hydride diisocyanate, isophorone two
At least one of cyanate.Polyalcohol is at least one of trimethylolethane, pentaerythrite.Epoxy resin prepolymer is dilute
Releasing agent can be selected o-tolyl glycidol ether, and chemical resistance is preferable, obvious excellent especially in solvent resistance and water resistance
In other diluents.
Claims (10)
1. a kind of macromolecule injecting paste material slip casting effect evaluation method, which comprises the following steps:
S1, under same geological conditions, two groups of multiple rows of drillings of constructing respectively, wherein one group is used as test group, another group of conduct
Control group, control group drilling are known as the drilling of A class, and test group drilling is known as the drilling of B class, the number of rows of every group of drilling, drilling depth and
Diameter is identical, and drilling array pitch is 5m；
S2, injection has the cement injection material of technology maturation to add grouting cable anchor or anchor pole in the drilling of A class, in the drilling injection of B class
There is macromolecule injecting paste material to add anchor slip casting rope or anchor pole；
S3 after grouting serous fluid solidification hole to be drilled, carries out drilling in the position apart from each drilling different distance and pries through, pry through each
Slurries in each drilling are averaged by the slurries in drilling in the pack completeness of different location in the pack completeness of different location, from
And two class of A, B drilling slurries are obtained in the pack completeness of different location；
S4, the filling by two class of A, B pried through drilling slurries in different location obtain weighted mean using weighted mean method, from
And slurries pack completeness comprehensive evaluation value in the drilling of two class of A, B is obtained, it is referred to as, cement injection material filling rate comprehensive evaluation value
A and macromolecule injecting paste material pack completeness comprehensive evaluation value b；
S5 compares a and b value size, as a≤b, illustrates the slip casting effect of macromolecule injecting paste material not less than cement injection material
Slip casting effect, supporting effect might as well, it is also strong to surrounding rock consolidation；As a ﹥ b, illustrate the slip casting effect ratio of macromolecule injecting paste material
The slip casting effect of cement injection material is poor, adjusts the grouting parameter of macromolecule injecting paste material at this time, reappraises, until a≤b,
To obtain the grouting parameter of macromolecule injecting paste material.
2. a kind of macromolecule chief commander's material for macromolecule injecting paste material slip casting effect evaluation method described in claim 1,
It is characterized in that, it includes two component of A, B；
Component A as following parts by weight raw material by be mixed after made of: 120-140 parts of isocyanates, foaming agent 20-40
Part, 10-30 parts of foam stabilizer, 8-10 parts of antistatic agent, 10-30 parts of epoxy resin, 8-10 parts of epoxy resin prepolymer diluent；
B component as following parts by weight raw material by made of after being mixed: concentration is 0-60 parts of the phosphatase 24, dense of 85wt%
Degree is 65% 30-50 parts of citric acid, 20-40 parts of polyalcohol, water-soluble 10-30 parts of trihydroxy polyethers, 6-8 parts of curing agent, hinders
Agent 7-9 parts, 5-7 parts of plasticiser of combustion；
The component A and B component are in use, be 1.5:1 mixing according to volume ratio；
The concentration of above-mentioned phosphoric acid and citric acid refers to mass percent concentration.
3. macromolecule injecting paste material as claimed in claim 2, it is characterised in that:
The component A is composed of the following raw materials in parts by weight: 125-135 parts of isocyanates, 25-35 parts of foaming agent, foam stabilizer
15-25 parts, 8.5-9.5 parts of antistatic agent, 15-25 parts of epoxy resin, 8.5-9.5 parts of epoxy resin prepolymer diluent；
The B component is composed of the following raw materials in parts by weight: the lemon that 5-55 parts of the phosphatase 24 that concentration is 85%, concentration are 65%
35-45 parts of lemon acid, 25-35 parts of polyalcohol, water-soluble 15-25 parts of trihydroxy polyethers, 6.5-7.5 parts of curing agent, fire retardant 7.5-
8.5 parts, 5.5-6.5 parts of plasticiser.
4. macromolecule injecting paste material as claimed in claim 2, it is characterised in that:
The component A is composed of the following raw materials in parts by weight: 130 parts of isocyanates, 20 parts of foam stabilizer, resists 30 parts of foaming agent
9 parts of electrostatic agent, 20 parts of epoxy resin, 9 parts of epoxy resin prepolymer diluent；
The B component is composed of the following raw materials in parts by weight: the citric acid that 50 parts of the phosphoric acid that concentration is 85%, concentration are 65%
40 parts, 30 parts of polyalcohol, water-soluble 20 parts of trihydroxy polyethers, 7 parts of curing agent, 8 parts of fire retardant, 6 parts of plasticiser.
5. macromolecule injecting paste material as claimed in claim 2, it is characterised in that:
The isocyanates, foaming agent, foam stabilizer weight ratio be 125-135:25-35:15-25.
6. macromolecule injecting paste material as claimed in claim 2, it is characterised in that:
Phosphoric acid that the concentration is 85%, the citric acid that concentration is 65%, polyalcohol weight ratio be 45-55:35-45:25-
35 parts.
7. macromolecule injecting paste material as claimed in claim 2, it is characterised in that:
The water-soluble trihydroxy polyethers, curing agent, fire retardant weight ratio be 15-25:6.5-7.5:7.5-8.5 parts.
8. macromolecule injecting paste material as claimed in claim 2, feature exist, the isocyanates is toluene di-isocyanate(TDI), two
At least one of diphenylmethane diisocyanate, isophorone diisocyanate.
9. macromolecule injecting paste material as claimed in claim 2, it is characterised in that: the polyalcohol is trimethylolethane and season penta
At least one of tetrol.
10. macromolecule injecting paste material as claimed in claim 2, it is characterised in that: the epoxy resin prepolymer diluent choosing
With o-tolyl glycidol ether.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113087869A (en) * | 2021-05-14 | 2021-07-09 | 重庆工程职业技术学院 | Coal mine grouting reinforcement material and preparation method thereof |
| CN115728190A (en) * | 2022-11-29 | 2023-03-03 | 鲁东大学 | Grouting anchor rod cable slurry diffusion effect evaluation method based on three-dimensional imaging technology |
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