CN110118852B - Method for evaluating grouting effect of high-polymer grouting material and grouting material - Google Patents
Method for evaluating grouting effect of high-polymer grouting material and grouting material Download PDFInfo
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- CN110118852B CN110118852B CN201910224614.0A CN201910224614A CN110118852B CN 110118852 B CN110118852 B CN 110118852B CN 201910224614 A CN201910224614 A CN 201910224614A CN 110118852 B CN110118852 B CN 110118852B
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Abstract
The invention discloses a method for evaluating the grouting effect of a high-molecular grouting material and the grouting material. The provided polymer grouting material comprises A, B two components, wherein the component A comprises isocyanate, a foaming agent, a foam stabilizer, an antistatic agent, and an epoxy resin and epoxy resin prepolymer diluent; the component B consists of phosphoric acid, citric acid, polyol, water-soluble trihydroxy polyether, a curing agent, a flame retardant and a plasticizer. By utilizing the evaluation method, grouting parameters can be optimized, grouting time is shortened in the anchor rod construction process, grouting materials are saved, the filling effect is good, the self bearing capacity of the surrounding rock can be safely and efficiently enhanced, high pre-tightening force is applied to the grouting anchor cable, and the supporting strength of the surrounding rock is improved.
Description
Technical Field
The invention relates to the technical field of coal mines, in particular to a method for detecting the grouting effect of a high-molecular grouting material.
Background
Along with mining extends to the deep, tunnel country rock pressure is along with increasing, and the normal mode of strutting can not form effectual control to the tunnel that the country rock is weak, broken, influences the stability and the security in tunnel. The grouting anchor rod (cable) integrates an anchoring support technology and a grouting reinforcement technology, so that the strength and self-supporting capacity of the surrounding rock are greatly improved, the weak surrounding rock can be effectively controlled, and the stability of the roadway is kept. But has the following defects after grouting: firstly, the conventional anchor rod (cable) grouting has the problems of long construction time, low strength and gaps after grouting, and the broken surrounding rock cannot be effectively reinforced; secondly, when the anchor rod (cable) is adopted for grouting support, the anchoring agent and surrounding broken rocks have cracks, the anchoring force cannot be ensured, and the mechanical property of the anchor rod (cable) cannot be fully utilized; and thirdly, after conventional anchor rods (cables) are adopted for grouting, grouting slurry is injected into the surrounding rock, the slurry leakage phenomenon is easy to occur, and the broken surrounding rock can not be effectively supported.
In order to overcome the defects of the traditional grouting materials in use, high-molecular grouting materials with good seepage-proofing and leakage-proofing effects are produced at present, such as epoxy resins, acrylamides, methacrylates, lignins, polyurethanes, urea-formaldehyde resins, acrylates and the like. The high-molecular grouting material can effectively support surrounding rocks, but for new materials, as the grouting parameters have no reference value, the mine operators lack operation basis, the grouting parameters can be set only blindly according to own experience, and whether the selected grouting parameters meet the support requirements cannot be guaranteed.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for evaluating the grouting effect of a high-molecular grouting material.
The invention also provides a high-molecular grouting material for the method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the grouting effect of a high-molecular grouting material comprises the following steps:
s1, respectively constructing two groups of multi-row drill holes under the same geological condition, wherein one group is used as a test group, the other group is used as a control group, the control group is called as an A-type drill hole, the test group is called as a B-type drill hole, the row number, the depth and the diameter of each group of drill holes are the same, and the row spacing of the drill holes is 5 m;
s2, applying cement grouting materials with mature technology and grouting anchor cables or anchor rods in the A-type drill holes, and applying polymer grouting materials and anchoring grouting cables or anchor rods in the B-type drill holes;
s3, after the grouting slurry for the drill holes is solidified, observing the drill holes at positions with different distances from each drill hole, observing the filling rate of the slurry in each drill hole at different positions, and averaging the filling rates of the slurry in each drill hole at different positions to obtain the filling rates of A, B two types of drilling slurry at different positions;
s4, obtaining weighted mean values by adopting a weighted average method for filling observed A, B types of drilling grout at different positions, thereby obtaining A, B types of comprehensive evaluation values of grout filling rate in drilling holes, namely a cement grouting material filling rate comprehensive evaluation value a and a polymer grouting material filling rate comprehensive evaluation value b;
s5, comparing the values of a and b, and when a is less than or equal to b, indicating that the grouting effect of the high polymer grouting material is not lower than that of the cement grouting material, the supporting effect is good, and the surrounding rock is reinforced; when a is more than or equal to b, the grouting effect of the high polymer grouting material is poorer than that of the cement grouting material, and the grouting parameters of the high polymer grouting material are adjusted and re-evaluated until a is less than or equal to b, so that the grouting parameters of the high polymer grouting material are obtained.
The drilling peeping technology is a mature technology, the equipment generally adopts a drilling peeping instrument, and the distance between the drilling peeping instrument and the drilling hole is selected by a person skilled in the art according to the actual situation and experience of a mine.
The polymer grouting material suitable for the evaluation method comprises A, B components;
the component A comprises the following raw materials in parts by weight: 120-140 parts of isocyanate, 20-40 parts of foaming agent, 10-30 parts of foam stabilizer, 8-10 parts of antistatic agent, 10-30 parts of epoxy resin and 8-10 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 40-60 parts of 85 wt% phosphoric acid, 30-50 parts of 65 wt% citric acid, 20-40 parts of polyhydric alcohol, 10-30 parts of water-soluble trihydroxy polyether, 6-8 parts of curing agent, 7-9 parts of flame retardant and 5-7 parts of plasticizer.
The component A comprises: the volume ratio of the component B is 1.5: 1.
preferably, the component A consists of the following raw materials in parts by weight: 135 parts of 125-grade isocyanate, 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 and 8.5-9.5 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 45-55 parts of 85% phosphoric acid, 35-45 parts of 65% citric acid, 25-35 parts of polyol, 15-25 parts of water-soluble trihydroxy polyether, 6.5-7.5 parts of curing agent, 7.5-8.5 parts of flame retardant and 5.5-6.5 parts of plasticizer.
Preferably, the component A consists of the following raw materials in parts by weight: 130 parts of isocyanate, 30 parts of foaming agent, 20 parts of foam stabilizer, 9 parts of antistatic agent, 20 parts of epoxy resin and 9 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 50 parts of 85% phosphoric acid, 40 parts of 65% citric acid, 30 parts of polyhydric alcohol, 20 parts of water-soluble trihydroxy polyether, 7 parts of curing agent, 8 parts of flame retardant and 6 parts of plasticizer.
Preferably, the weight ratio of the isocyanate, the foaming agent and the foam stabilizer is 125-135: 25-35: 15-25.
Preferably, the weight ratio of the phosphoric acid with the concentration of 85 percent, the citric acid with the concentration of 65 percent and the polyalcohol is 45-55: 35-45: 25-35 parts.
Preferably, the weight ratio of the water-soluble trihydroxy polyether to the curing agent to the flame retardant is 15-25: 6.5-7.5: 7.5 to 8.5 portions.
Preferably, the isocyanate is at least one of toluene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate.
Preferably, the polyhydric alcohol is at least one of trimethylolethane and pentaerythritol.
Preferably, the epoxy resin prepolymer diluent can be o-tolyl glycidyl ether, which has better chemical resistance, and is particularly superior to other diluents in solvent resistance and water resistance.
The concentrations of phosphoric acid and citric acid in the present invention both refer to mass percentage concentrations.
The application method of the high polymer grouting material comprises the following steps: the components A and B are mixed and stirred to form two homogeneous liquids, and when the anchor rod drilling fluid is used, the components A and B are mixed and poured to the anchor rod drilling position through a double-liquid pump according to the volume ratio of 1.5: 1.
The invention has the beneficial effects that:
1. the evaluation method optimizes grouting parameters, shortens grouting time, saves grouting materials and has good filling effect in the construction process of the anchor rod (cable). The self bearing capacity of the surrounding rock can be safely and efficiently enhanced, high pre-tightening force is applied to the grouting anchor cable, and the supporting strength of the surrounding rock is improved.
2. According to the invention, by means of the arrangement, the epoxy group, the isocyanate and the polyol form the polyurethane prepolymer for copolymerization, the compressive strength and the bending strength of the grouting material after hardening are improved, the intermolecular distance is increased after the polyurethane is reacted and cured, the heat dissipation is improved, the heat released by the reaction is dispersed and diluted, and the heat is difficult to accumulate, so that the core temperature of the polyurethane material during reaction and curing is reduced, the flame retardant is added, the flame retardant capability is improved, the curing agent is added, the curing rate is improved, the grouting time is shortened in the anchor rod construction process, the grouting material is saved, and the filling effect is good. The self bearing capacity of the surrounding rock can be safely and efficiently enhanced, high pre-tightening force is applied to the grouting anchor cable, and the supporting strength of the surrounding rock is improved.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting the effect of a polymer grouting material according to the present invention;
FIG. 2 is a schematic view of common grouting material + anchor rod (cable) grouting reinforcement;
fig. 3 is a schematic view of the polymer grouting material + anchor rod (cable) grouting reinforcement provided by the present invention;
fig. 4a and 4b are views of a grouting material + bolt (cable) grouting reinforcement peen, respectively, with fig. 4a reflecting a view from the side of the borehole and fig. 4b reflecting a view from the front of the borehole.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
The invention discloses a method for detecting the grouting effect of a polymer grouting material, which comprises the following steps (refer to fig. 1):
and S1, under the condition that the geological conditions are not changed greatly, drilling two groups of drilled holes, wherein one group of drilled holes is used as a control group and is called as A-type drilled holes, the other group of drilled holes is used as a test group and is called as B-type drilled holes, the depth of each drilled hole is 4m, and the diameter of each drilled hole is 32 mm. For convenience of presentation, the embodiment takes each group of three rows of drill holes as an example, the row spacing of the drill holes is 5m, the A-type three rows of drill holes are numbered as A1, A2 and A3, and the B-type three rows of drill holes are numbered as B1, B2 and B3;
s2, drilling holes A1, A2 and A3 with cement grouting materials and grouting anchor cables (refer to FIG. 2), wherein grouting parameters are according to empirical values; drilling holes B1, B2 and B3 with polymer grouting materials and grouting anchor cables (refer to FIG. 3), and setting one grouting parameter in advance;
s3, referring to fig. 4a and 4B, after the grout in the A-type and B-type drill holes to be numbered is solidified, drilling holes with the depth of 4m and the diameter of 32mm at three positions which are sequentially far away from the A1 drill hole and are S1, S2 and S3 respectively, and then obtaining the filling rates of the grout in the A1 drill hole at the three positions in the drill holes at the three positions through a drill hole peeping imaging technology respectively; similarly, drilling holes with the depth of 4m and the diameter of 32mm at three positions which are sequentially far away from the A2 drilled hole and are S1, S2 and S3 respectively, and obtaining the filling rate of the grout in the A2 drilled hole at the three positions by using the same drilling hole peeping imaging technical method; by analogy, the filling rates of the slurries in the A3, the B1, the B2 and the B3 at three positions far away from the S1, the S2 and the S3 are obtained; when the drilling hole peeping is adopted, three times of drilling hole peeping are carried out at different distances from a grouting drilling hole, so that the slurry filling condition in each drilling hole is reflected more truly;
in this embodiment:
the filling rates of the A1, A2 and A3 drilling slurry at the S1 position are respectively represented by a11, a12 and a13, and the average value is represented by a1, so that the filling rate of the A type drilling slurry at the S1 position is obtained;
the filling rates of the A1, A2 and A3 drilling slurry at the S2 position are respectively represented by a21, a22 and a23, and the average value is represented by a2, so that the filling rate of the A type drilling slurry at the S2 position is obtained;
the filling rates of the A1, A2 and A3 drilling slurry at the S3 position are respectively represented by a31, a32 and a33, and the average value is represented by A3, so that the filling rate of the A type drilling slurry at the S3 position is obtained;
the filling rates of B1, B2 and B3 drilling slurry at the S1 position are respectively represented by B11, B12 and B13, and the average value is represented by B1, so that the filling rate of the B drilling slurry at the S1 position is obtained;
the filling rates of the B1, B2 and B3 drilling slurries at the S2 position are respectively represented by B21, B22 and B23, and the average values are represented by B2, so that the filling rate of the B drilling slurries at the S2 position is obtained;
the filling rates of B1, B2 and B3 drilling slurry at the S3 position are respectively represented by B31, B32 and B33, and the average value is represented by B3, so that the filling rate of the B drilling slurry at the S3 position is obtained;
s4, calculating the filling rates a1, a2 and a3 of the grout of the A-type drilling at the positions S1, S2 and S3 by adopting a weighted average method to obtain a comprehensive evaluation value a of the filling rate effect of the grout of the A-type drilling; similarly, calculating the filling rates B1, B2 and B3 of the slurry of the B-type drill holes at the positions S1, S2 and S3 by adopting a weighted average method to obtain a comprehensive evaluation value B of the filling rate effect of the slurry of the B-type drill holes; that is to say:
a＝e1a1+e2a2+e3a3；
b＝f1b1+f2b2+f3b3；
the above e1, e2, e3, f1, f2 and f3 are all weighting coefficients, and e1+ e2+ e3 is equal to 1, and f1+ f2+ f3 is equal to 1.
The weighted average method mentioned in the present invention is the prior art, and the weighting coefficient is determined by the skilled person according to the construction site situation and considering the importance degree of the three positions S1, S2 and S3.
And S5, comparing the comprehensive evaluation value a of the filling rate effect of the A-type drilling slurry with the comprehensive evaluation value B of the filling rate effect of the B-type drilling slurry, and evaluating the grouting effect of the hole sealing material according to the comparison result. Specifically, the method comprises the following steps:
when a is less than or equal to b, the grouting effect of the high-molecular hole sealing material is not inferior to that of the traditional cement grouting material, and the surrounding rock reinforcement meets the requirement;
when a > and b indicate that the grouting effect of the polymer hole sealing material is poorer than that of the common grouting material, the grouting parameters of the polymer hole sealing material are adjusted, and the evaluation is performed again according to the construction flow shown in the figure 1 until a is less than or equal to b, so that the parameters of the polymer hole sealing material are determined.
The grouting material of the present invention will be further explained with reference to specific examples.
Example one
The invention provides a high polymer grouting material, which comprises A, B components;
the component A comprises the following raw materials in parts by weight: 120 parts of isocyanate, 20 parts of foaming agent, 10 parts of foam stabilizer, 8 parts of antistatic agent, 10 parts of epoxy resin and 8 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 40 parts of phosphoric acid with the concentration of 85%, 30 parts of citric acid with the concentration of 65%, 20 parts of polyhydric alcohol, 10 parts of water-soluble trihydroxy polyether, 6 parts of curing agent, 7 parts of flame retardant and 5 parts of plasticizer.
The component A comprises: the volume ratio of the component B is 1.5: 1.
the invention also provides a using method of the high polymer grouting material, which comprises the following steps: the components A and B are mixed and stirred to form two homogeneous liquids, and when the anchor rod drilling fluid is used, the components A and B are mixed and poured to the anchor rod drilling position through a double-liquid pump according to the volume ratio of 1.5: 1.
Example two
The invention provides a high polymer grouting material, which comprises A, B components;
the component A comprises the following raw materials in parts by weight: 125 parts of isocyanate, 25 parts of foaming agent, 15 parts of foam stabilizer, 8.5 parts of antistatic agent, 15 parts of epoxy resin and 8.5 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 45 parts of 85% phosphoric acid, 35 parts of 65% citric acid, 25 parts of polyol, 15 parts of water-soluble trihydroxy polyether, 6.5 parts of curing agent, 7.5 parts of flame retardant and 5.5 parts of plasticizer.
The component A comprises: the volume ratio of the component B is 1.5: 1.
the using method is the same as the first embodiment.
EXAMPLE III
The invention provides a high polymer grouting material, which comprises A, B components;
the component A comprises the following raw materials in parts by weight: 130 parts of isocyanate, 30 parts of foaming agent, 20 parts of foam stabilizer, 9 parts of antistatic agent, 20 parts of epoxy resin and 9 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 50 parts of 85% phosphoric acid, 40 parts of 65% citric acid, 30 parts of polyhydric alcohol, 20 parts of water-soluble trihydroxy polyether, 7 parts of curing agent, 8 parts of flame retardant and 6 parts of plasticizer.
The component A comprises: the volume ratio of the component B is 1.5: 1.
the using method is the same as the first embodiment.
Example four
The invention provides a high polymer grouting material, which comprises A, B components;
the component A comprises the following raw materials in parts by weight: 135 parts of isocyanate, 35 parts of foaming agent, 25 parts of foam stabilizer, 9.5 parts of antistatic agent, 25 parts of epoxy resin and 9.5 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 55 parts of 85% phosphoric acid, 45 parts of 65% citric acid, 35 parts of polyol, 25 parts of water-soluble trihydroxy polyether, 7.5 parts of curing agent, 8.5 parts of flame retardant and 6.5 parts of plasticizer.
The component A comprises: the volume ratio of the component B is 1.5: 1.
the using method is the same as the first embodiment.
EXAMPLE five
The invention provides a high polymer grouting material, which comprises A, B components;
the component A comprises the following raw materials in parts by weight: 140 parts of isocyanate, 40 parts of foaming agent, 30 parts of foam stabilizer, 10 parts of antistatic agent, 30 parts of epoxy resin and 10 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 60 parts of 85% phosphoric acid, 50 parts of 65% citric acid, 40 parts of polyhydric alcohol, 30 parts of water-soluble trihydroxy polyether, 8 parts of curing agent, 9 parts of flame retardant and 7 parts of plasticizer.
The component A comprises: the volume ratio of the component B is 1.5: 1.
the using method is the same as the first embodiment.
The isocyanate is at least one selected from toluene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate. The polyalcohol is at least one of trimethylolethane and pentaerythritol. The epoxy resin prepolymer diluent can be o-tolyl glycidyl ether, has good chemical resistance, and is particularly superior to other diluents in solvent resistance and water resistance.
Claims (10)
1. A method for evaluating the grouting effect of a high-molecular grouting material is characterized by comprising the following steps:
s1, respectively constructing two groups of multi-row drill holes under the same geological condition, wherein one group is used as a test group, the other group is used as a control group, the control group is called as an A-type drill hole, the test group is called as a B-type drill hole, the row number, the depth and the diameter of each group of drill holes are the same, and the row spacing of the drill holes is 5 m;
s2, applying cement grouting materials and grouting anchor cables or anchor rods with mature technology in the A-type drill holes, and applying polymer grouting materials and grouting anchor cables or anchor rods in the B-type drill holes;
s3, after the grouting slurry for the drill holes is solidified, observing the drill holes at positions with different distances from each drill hole, observing the filling rate of the slurry in each drill hole at different positions, and averaging the filling rates of the slurry in each drill hole at different positions to obtain the filling rates of A, B two types of drilling slurry at different positions;
s4, obtaining weighted mean values of the filling rates of the observed A, B types of drilling grout at different positions by adopting a weighted average method, thereby obtaining A, B types of comprehensive evaluation values of the filling rates of the grout in the drilling holes, namely a cement grouting material filling rate comprehensive evaluation value a and a polymer grouting material filling rate comprehensive evaluation value b;
s5, comparing the values of a and b, and when a is less than or equal to b, indicating that the grouting effect of the high polymer grouting material is not lower than that of the cement grouting material, the supporting effect is good, and the surrounding rock is reinforced; when a is more than or equal to b, the grouting effect of the high polymer grouting material is poorer than that of the cement grouting material, and the grouting parameters of the high polymer grouting material are adjusted and re-evaluated until a is less than or equal to b, so that the grouting parameters of the high polymer grouting material are obtained.
2. A polymer grouting material used for the method for evaluating the grouting effect of the polymer grouting material according to claim 1, which is characterized by comprising A, B components;
the component A is prepared by mixing and stirring the following raw materials in parts by weight: 120-140 parts of isocyanate, 20-40 parts of foaming agent, 10-30 parts of foam stabilizer, 8-10 parts of antistatic agent, 10-30 parts of epoxy resin and 8-10 parts of epoxy resin prepolymer diluent;
the component B is prepared by mixing and stirring the following raw materials in parts by weight: 40-60 parts of phosphoric acid with the concentration of 85 wt%, 30-50 parts of citric acid with the concentration of 65%, 20-40 parts of polyhydric alcohol, 10-30 parts of water-soluble trihydroxy polyether, 6-8 parts of curing agent, 7-9 parts of flame retardant and 5-7 parts of plasticizer;
when the component A and the component B are used, the volume ratio of the component A to the component B is 1.5:1, mixing;
the concentrations of phosphoric acid and citric acid mentioned above refer to mass percentage concentrations.
3. The polymer grouting material as claimed in claim 2, wherein:
the component A consists of the following raw materials in parts by weight: 135 parts of 125-grade isocyanate, 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 and 8.5-9.5 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 45-55 parts of 85% phosphoric acid, 35-45 parts of 65% citric acid, 25-35 parts of polyol, 15-25 parts of water-soluble trihydroxy polyether, 6.5-7.5 parts of curing agent, 7.5-8.5 parts of flame retardant and 5.5-6.5 parts of plasticizer.
4. The polymer grouting material as claimed in claim 2, wherein:
the component A consists of the following raw materials in parts by weight: 130 parts of isocyanate, 30 parts of foaming agent, 20 parts of foam stabilizer, 9 parts of antistatic agent, 20 parts of epoxy resin and 9 parts of epoxy resin prepolymer diluent;
the component B comprises the following raw materials in parts by weight: 50 parts of 85% phosphoric acid, 40 parts of 65% citric acid, 30 parts of polyhydric alcohol, 20 parts of water-soluble trihydroxy polyether, 7 parts of curing agent, 8 parts of flame retardant and 6 parts of plasticizer.
5. The polymer grouting material as claimed in claim 2, wherein:
the weight ratio of the isocyanate, the foaming agent and the foam stabilizer is 125-135: 25-35: 15-25.
6. The polymer grouting material as claimed in claim 2, wherein:
the weight ratio of the phosphoric acid with the concentration of 85 percent, the citric acid with the concentration of 65 percent and the polyalcohol is 45-55: 35-45: 25-35 parts.
7. The polymer grouting material as claimed in claim 2, wherein:
the weight ratio of the water-soluble trihydroxy polyether to the curing agent to the flame retardant is 15-25: 6.5-7.5: 7.5 to 8.5 portions.
8. The polymer grouting material according to claim 2, wherein the isocyanate is at least one of toluene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate.
9. The polymer grouting material as claimed in claim 2, wherein: the polyhydric alcohol is at least one of trimethylolethane and pentaerythritol.
10. The polymer grouting material as claimed in claim 2, wherein: the epoxy resin prepolymer diluent is o-tolyl glycidyl ether.
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| 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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