CN105787645B - Quantitative evaluation method for soft rock roadway bolting-grouting support system - Google Patents
Quantitative evaluation method for soft rock roadway bolting-grouting support system Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 38
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 36
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- 238000009792 diffusion process Methods 0.000 claims abstract description 13
- 238000011156 evaluation Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 11
- 238000004873 anchoring Methods 0.000 claims description 6
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- 239000011440 grout Substances 0.000 claims description 6
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- 238000007586 pull-out test Methods 0.000 claims description 3
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Abstract
The invention relates to a quantitative evaluation method for a soft rock roadway bolting-grouting support system, which comprises the following steps: step one, acquiring data before grouting; step two, data acquisition after grouting; thirdly, analyzing a soft rock roadway bolting-grouting support system; and step four, establishing a quantitative evaluation index of the soft rock roadway bolting-grouting support system by using a weight analysis method based on each performance evaluation value obtained in the step three, carrying out quantitative evaluation on the soft rock roadway bolting-grouting support system, and comparing the quantitative evaluation index with a field statistical standard value. The invention has the advantages that: the invention introduces a nondestructive testing technology into the quantitative evaluation of an anchor-grouting support system for the first time, and combines the testing means such as a drawing force test, grouting diffusion range detection, displacement convergence, economic indexes and the like, aiming at providing a quantitative evaluation method of the anchor-grouting support system of a soft rock roadway, and solving the problems of backward testing means, single evaluation method, incapability of quantifying and the like in the prior art.
Description
Technical Field
The invention relates to a quantitative evaluation method for a soft rock roadway bolting-grouting support system.
Background
With the increase of the mining intensity and the mining depth of coal resources, various complex and difficult-to-support soft rock roadways appear in large quantity, and great threats are caused to the stability control and the safe production of surrounding rocks. The bolting-grouting support technology is an effective means for supporting the soft rock roadway, can improve the crushing state of the surrounding rock, enhance the self-bearing capacity of the surrounding rock, control the deformation and damage of the surrounding rock and provide a reliable foundation for roadway expansion and reinforcement in the later stage of the roadway. However, quantitative evaluation of an anchor-grouting support system is difficult to obtain, mainly depends on experience at present, is mostly qualitative evaluation, lacks an effective quantitative evaluation method, and has the defects of laggard detection means, low accuracy and the like in an evaluation method based on displacement convergence, an anchor rod (cable) dynamometer and the like.
In recent years, nondestructive testing technology is used as an effective testing means, overcomes the defects of few testing samples, time limitation and the like, is accepted by more and more field technicians, and is widely applied to projects such as side slopes. However, the evaluation of the bolting-grouting support system by nondestructive testing in mines has not been reported.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a quantitative evaluation method for a soft rock roadway bolting-grouting support system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a quantitative evaluation method for a soft rock roadway bolting-grouting support system comprises the following steps:
step one, acquiring data before grouting;
step two, data acquisition after grouting;
thirdly, analyzing a soft rock roadway bolting-grouting support system;
and step four, establishing a quantitative evaluation index of the soft rock roadway bolting-grouting support system by using a weight analysis method based on each performance evaluation value obtained in the step three, carrying out quantitative evaluation on the soft rock roadway bolting-grouting support system, and comparing the quantitative evaluation index with a field statistical standard value.
The first step is specifically as follows: selecting two roadways with similar geological conditions and equal length, wherein the first roadway adopts non-anchor grouting support, and measuring the maximum displacement when the displacement convergence of the first roadway is stable;
for the first tunnel, selecting a plurality of common anchor rods, wherein the rod body length of each common anchor rod isL aAnchoring length ofL bWith a pre-tightening force ofF c(ii) a A plurality of high-strength anchor cables, each high-strength anchor cable having a rod body length ofL dAnchoring length ofL eWith a pre-tightening force of FfThe high-strength anchor rope of (1) was subjected to a pull-out test, wherein FfThe pre-tightening force value is larger than 150kN of the common anchor cable, and the pulling force of all common anchor rods and high-strength anchor cables is counted;
detecting common anchor rods and high-strength anchor cables in a first roadway by adopting a nondestructive detector, and counting the working loads of all the common anchor rods and the high-strength anchor cables;
and counting the total number of the common anchor rods and the high-strength anchor cables in the first roadway, and determining the cost of the common anchor rods and the high-strength anchor cables according to the unit price of the common anchor rods, the high-strength anchor cables and the related matched components.
The second step is specifically as follows: adopting anchor grouting support for a second roadway, and measuring the maximum displacement of the second roadway after the displacement convergence of the second roadway is stable after the second roadway is grouted stably;
selecting a plurality of grouting anchor rods and a plurality of grouting anchor cables to carry out a drawing test, and counting the drawing force of all the grouting anchor rods and the grouting anchor cables;
detecting grouting anchor rods and grouting anchor cables in a grouting area by adopting a nondestructive detector, and counting the working loads of all the grouting anchor rods and the grouting anchor cables;
counting the total number of grouting anchor rods and grouting anchor cables in the second roadway, and determining the cost of the grouting anchor rods and the grouting anchor cables according to the unit price of the grouting anchor rods, the grouting anchor cables and related matched components;
and (4) drilling surrounding rock in the grouting area, detecting in the drilled hole by using a drilling peeking imaging recorder, and counting the grout diffusion range of the grouting anchor rod and the grouting anchor cable.
The third step is based on the maximum displacement of the non-anchored roadway and the anchored roadway; the pulling force of a common anchor rod and a high-strength anchor cable of a non-anchor-grouting roadway, and the pulling force of a grouting anchor rod and a grouting anchor cable of the anchor-grouting roadway; the work loads of a common anchor rod and a high-strength anchor cable of the non-anchor grouting roadway, and the work loads of a grouting anchor rod and a grouting anchor cable of the anchor grouting roadway; the total price of a common anchor rod and a high-strength anchor cable of a non-anchor injection roadway and the total price of a grouting anchor rod and a grouting anchor cable of the anchor injection roadway; and (3) calculating the anchor grouting support displacement convergence reduction rate, the anchor rod drawing force improvement rate, the anchor cable drawing force improvement rate, the anchor rod working load improvement rate, the anchor cable working load improvement rate, the support component cost reduction rate and the grouting anchor rod and grouting anchor cable slurry diffusion rates respectively.
The maximum displacement when the non-anchor supporting roadway is stable in displacement convergence is A1(ii) a The average values of the pulling forces of the common anchor rod and the high-strength anchor rope are respectively B1、C1(ii) a The working loads of the common anchor rod and the high-strength anchor cable are respectively D1、E1(ii) a The cost of the common anchor rod and the high-strength anchor cable is F1(ii) a The maximum displacement when the displacement convergence of the anchor-grouting supporting roadway is stable is A2(ii) a The average drawing force values of the grouting anchor rod and the grouting anchor cable are respectively B2、C2(ii) a The working loads of the grouting anchor rod and the grouting anchor cable are respectively D2、E2(ii) a The cost of the grouting anchor rod and the grouting anchor cable is F2(ii) a The grout diffusion ranges of the grouting anchor rods and the grouting anchor cables are G, H respectively; the reduction rate of the convergence of the bolting-grouting support displacement is reduced; the anchor rod drawing force improvement rate; the anchor cable drawing force improvement rate; the working load increasing rate of the anchor rod; the working load increasing rate of the anchor cable is increased; cost reduction rate of supporting member
(ii) a Slurry diffusivity of grouting anchor rod
(ii) a Slurry diffusivity of grouting anchor cable
Wherein, in the step (A),Lin order to slip-in the length of the anchor rod,Jthe length of the anchor cable is the grouting length.
The quantitative evaluation method for the soft rock roadway bolting-grouting support system according to claim 4, characterized in that in the fourth step, the quantitative evaluation is carried out byWeighting to obtain a comprehensive evaluation index R ═ Sigma M of mechanical propertynRnAnd quantitatively evaluating the R value and a statistical standard value R of the effect of the anchor-grouting support system of a specific soft rock roadway0Comparing, and quantitatively obtaining the quantitative evaluation effect of the soft rock roadway bolting-grouting support system; wherein M isnAs a weight coefficient, n is 1,2 …, 8, the magnitude of which is according to R1~R8The size of the test data and the reliability and accuracy of the test data are distributed to meet the requirement of sigma Mn＝1。
The invention has the advantages that: the invention introduces a nondestructive testing technology into the quantitative evaluation of an anchor-grouting support system for the first time, and combines the testing means such as a drawing force test, grouting diffusion range detection, displacement convergence, economic indexes and the like, aiming at providing a quantitative evaluation method of the anchor-grouting support system of a soft rock roadway, and solving the problems of backward testing means, single evaluation method, incapability of quantifying and the like in the prior art.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
The invention relates to a quantitative evaluation method for a soft rock roadway bolting-grouting support system, which comprises the following steps:
step one, acquiring data before grouting;
step two, data acquisition after grouting;
thirdly, analyzing a soft rock roadway bolting-grouting support system;
and step four, establishing a quantitative evaluation index of the soft rock roadway bolting-grouting support system by using a weight analysis method based on each performance evaluation value obtained in the step three, carrying out quantitative evaluation on the soft rock roadway bolting-grouting support system, and comparing the quantitative evaluation index with a field statistical standard value.
The first step is specifically as follows: selecting two roadways with similar geological conditions such as geological structure and the like and equal length, adopting non-anchor support for a first roadway, and measuring the maximum displacement when the displacement convergence of the first roadway is stable;
for the first tunnel, selecting a plurality of common anchor rods, wherein the rod body length of each common anchor rod isL aAnchoring length ofL bWith a pre-tightening force ofF c(ii) a A plurality of high-strength anchor cables, each high-strength anchor cable having a rod body length ofL dAnchoring length ofL eWith a pre-tightening force of FfThe high-strength anchor rope of (1) was subjected to a pull-out test, wherein FfThe pre-tightening force value is larger than 150kN of the common anchor cable, and the pulling force of all common anchor rods and high-strength anchor cables is counted;
detecting common anchor rods and high-strength anchor cables in a first roadway by adopting a nondestructive detector, and counting the working loads of all the common anchor rods and the high-strength anchor cables;
and counting the total number of the common anchor rods and the high-strength anchor cables in the first roadway, and determining the cost of the common anchor rods and the high-strength anchor cables according to the unit price of the common anchor rods, the high-strength anchor cables and the related matched components.
The second step is specifically as follows: adopting anchor grouting support for a second roadway, and measuring the maximum displacement of the second roadway after the displacement convergence of the second roadway is stable after the second roadway is grouted stably;
selecting a plurality of grouting anchor rods and a plurality of grouting anchor cables to carry out a drawing test, and counting the drawing force of all the grouting anchor rods and the grouting anchor cables;
detecting grouting anchor rods and grouting anchor cables in a grouting area by adopting a nondestructive detector, and counting the working loads of all the grouting anchor rods and the grouting anchor cables;
counting the total number of grouting anchor rods and grouting anchor cables in the second roadway, and determining the cost of the grouting anchor rods and the grouting anchor cables according to the unit price of the grouting anchor rods, the grouting anchor cables and related matched components;
and (4) drilling surrounding rock in the grouting area, detecting in the drilled hole by using a drilling peeking imaging recorder, and counting the grout diffusion range of the grouting anchor rod and the grouting anchor cable.
The third step is based on the maximum displacement of the non-anchored roadway and the anchored roadway; the pulling force of a common anchor rod and a high-strength anchor cable of a non-anchor-grouting roadway, and the pulling force of a grouting anchor rod and a grouting anchor cable of the anchor-grouting roadway; the work loads of a common anchor rod and a high-strength anchor cable of the non-anchor grouting roadway, and the work loads of a grouting anchor rod and a grouting anchor cable of the anchor grouting roadway; the total price of a common anchor rod and a high-strength anchor cable of a non-anchor injection roadway and the total price of a grouting anchor rod and a grouting anchor cable of the anchor injection roadway; and (3) calculating the anchor grouting support displacement convergence reduction rate, the anchor rod drawing force improvement rate, the anchor cable drawing force improvement rate, the anchor rod working load improvement rate, the anchor cable working load improvement rate, the support component cost reduction rate and the grouting anchor rod and grouting anchor cable slurry diffusion rates respectively.
The maximum displacement when the non-anchor supporting roadway is stable in displacement convergence is A1(ii) a The average values of the pulling forces of the common anchor rod and the high-strength anchor rope are respectively B1、C1(ii) a The working loads of the common anchor rod and the high-strength anchor cable are respectively D1、E1(ii) a The cost of the common anchor rod and the high-strength anchor cable is F1(ii) a The maximum displacement when the displacement convergence of the anchor-grouting supporting roadway is stable is A2(ii) a The average drawing force values of the grouting anchor rod and the grouting anchor cable are respectively B2、C2(ii) a The working loads of the grouting anchor rod and the grouting anchor cable are respectively D2、E2(ii) a The cost of the grouting anchor rod and the grouting anchor cable is F2(ii) a The grout diffusion ranges of the grouting anchor rods and the grouting anchor cables are G, H respectively; the reduction rate of the convergence of the bolting-grouting support displacement is reduced; the anchor rod drawing force improvement rate; the anchor cable drawing force improvement rate; the working load increasing rate of the anchor rod; the working load increasing rate of the anchor cable is increased; the reduction rate of the cost of the supporting member; slurry diffusivity of grouting anchor rod
(ii) a Slurry diffusivity of grouting anchor cable
Wherein, in the step (A),Lin order to slip-in the length of the anchor rod,Jthe length of the anchor cable is the grouting length.
In the fourth step, the comprehensive evaluation index R ═ Σ M of mechanical properties is obtained by weightingnRnAnd quantitatively evaluating the R value and a statistical standard value R of the effect of the anchor-grouting support system of a specific soft rock roadway0Comparing, and quantitatively obtaining the quantitative evaluation effect of the soft rock roadway bolting-grouting support system; wherein M isnAs a weight coefficient, n is 1,2 …, 8, the magnitude of which is according to R1~R8The size of the test data and the reliability and accuracy of the test data are distributed to meet the requirement of sigma Mn＝1。
Claims (3)
1. A quantitative evaluation method for a soft rock roadway bolting-grouting support system is characterized by comprising the following steps:
step one, acquiring data before grouting; the first step is specifically as follows: selecting two roadways with similar geological conditions and equal length, wherein the first roadway adopts non-anchor grouting support, and measuring the maximum displacement when the displacement convergence of the first roadway is stable;
selecting a plurality of common anchor rods for the first roadway, wherein the rod body length of each common anchor rod is LaAnchoring length of LbWith a pre-tightening force of Fc(ii) a A plurality of high-strength anchor cables, wherein the length of the rod body of each high-strength anchor cable is LdAnchoring length of LeWith a pre-tightening force of FfThe high-strength anchor rope of (1) was subjected to a pull-out test, wherein FfThe pre-tightening force value is larger than 150kN of the common anchor cable, and the pulling force of all common anchor rods and high-strength anchor cables is counted;
detecting common anchor rods and high-strength anchor cables in a first roadway by adopting a nondestructive detector, and counting the working loads of all the common anchor rods and the high-strength anchor cables;
counting the total number of the common anchor rods and the high-strength anchor cables in the first roadway, and determining the cost of the common anchor rods and the high-strength anchor cables according to the unit price of the common anchor rods, the high-strength anchor cables and the related matched components;
step two, data acquisition after grouting; the second step is specifically as follows: adopting anchor grouting support for a second roadway, and measuring the maximum displacement of the second roadway after the displacement convergence of the second roadway is stable after the second roadway is grouted stably;
selecting a plurality of grouting anchor rods and a plurality of grouting anchor cables to carry out a drawing test, and counting the drawing force of all the grouting anchor rods and the grouting anchor cables;
detecting grouting anchor rods and grouting anchor cables in a grouting area by adopting a nondestructive detector, and counting the working loads of all the grouting anchor rods and the grouting anchor cables;
counting the total number of grouting anchor rods and grouting anchor cables in the second roadway, and determining the cost of the grouting anchor rods and the grouting anchor cables according to the unit price of the grouting anchor rods, the grouting anchor cables and related matched components;
drilling surrounding rock in a grouting area, detecting in the drilled hole by using a drilling peering imaging recorder, and counting the grout diffusion ranges of a grouting anchor rod and a grouting anchor cable;
thirdly, analyzing a soft rock roadway bolting-grouting support system; the third step is based on the maximum displacement of the non-anchored roadway and the anchored roadway; pulling force of a common anchor rod, a high-strength anchor rod and a grouting anchor cable; the working loads of a common anchor rod, a high-strength anchor cable and a grouting anchor rod and a grouting anchor cable; the cost of a common anchor rod and a high-strength anchor cable and the cost of a grouting anchor rod and a grouting anchor cable; grouting anchor rod slurry diffusion range and grouting anchor cable slurry diffusion range, respectively calculating anchor-grouting support displacement convergence reduction rate, anchor rod drawing force improvement rate, anchor cable drawing force improvement rate, anchor rod working load improvement rate, anchor cable working load improvement rate, support member cost reduction rate and grouting anchor rod and grouting anchor cable slurry diffusion rate;
and step four, establishing a quantitative evaluation index of the soft rock roadway bolting-grouting support system by using a weight analysis method based on each performance evaluation value obtained in the step three, carrying out quantitative evaluation on the soft rock roadway bolting-grouting support system, and comparing the quantitative evaluation index with a field statistical standard value.
2. The quantitative evaluation method for the soft rock roadway bolting-grouting support system according to claim 1, wherein the maximum displacement amount when the non-bolting-grouting support roadway is stable in displacement convergenceIs A1(ii) a The average values of the pulling forces of the common anchor rod and the high-strength anchor rope are respectively B1、C1(ii) a The working loads of the common anchor rod and the high-strength anchor cable are respectively D1、E1(ii) a The cost of the common anchor rod and the high-strength anchor cable is F1(ii) a The maximum displacement when the displacement convergence of the anchor-grouting supporting roadway is stable is A2(ii) a The average drawing force values of the grouting anchor rod and the grouting anchor cable are respectively B2、C2(ii) a The working loads of the grouting anchor rod and the grouting anchor cable are respectively D2、E2(ii) a The cost of the grouting anchor rod and the grouting anchor cable is F2(ii) a The grout diffusion ranges of the grouting anchor rods and the grouting anchor cables are G, H respectively; the reduction rate of the convergence of the bolting-grouting support displacement is reduced; the anchor rod drawing force improvement rate; the anchor cable drawing force improvement rate; the working load increasing rate of the anchor rod; the working load increasing rate of the anchor cable is increased; the reduction rate of the cost of the supporting member; grouting anchor slurry diffusivity; grouting anchor cable slurry diffusivity.
3. The method for quantitatively evaluating a soft rock roadway bolting-grouting support system according to claim 1 or claim 2, characterized in that in the fourth step, a comprehensive evaluation index R ═ Σ M of mechanical properties is obtained by weightingnRnWherein M isnN is a weight coefficient, 1,2.. 8, the magnitude of which depends on R1～R8The size of the test data and the reliability and accuracy of the test data are distributed to meet the requirement of sigma Mn＝1。
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