CN114861370B - Design method for roadway anchor rod and anchor cable support in corrosive mine environment - Google Patents
Design method for roadway anchor rod and anchor cable support in corrosive mine environment Download PDFInfo
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Abstract
The invention discloses a method for designing a roadway anchor rod and anchor cable support in a corrosive mine environment, which comprises the following steps: taking a water sample in a roadway, and detecting the basic properties of the water sample and roadway environmental parameters; detecting basic properties of anchor rod and anchor cable materials; configuring corrosion law experiment parameter conditions; acquiring corrosion rules of anchor rods and anchor cables in a roadway supported by the existing anchor rods and anchor cables; detecting the stress of an anchor rod and an anchor cable in a roadway supported by the existing anchor rod and anchor cable; based on the corrosion rule of the anchor rod and the anchor cable, the stress of the anchor rod and the anchor cable, and determining a design scheme of the roadway to be supported. The invention comprehensively considers the actual supporting environment and the stress conditions of the anchor rods and the anchor cables in the whole service process, provides an effective and strong-pertinence supporting design scheme for supporting similar roadways, and greatly improves the long-term effectiveness and the stability of a roadway supporting system.
Description
Technical Field
The invention relates to the technical field of roadway support construction. More specifically, the invention relates to a design method for roadway anchor rod and anchor cable support in a corrosive mine environment.
Background
Most underground coal mine environments are complex, mine water is gushed out, and the coal mine is high in temperature and humidity and ventilated all the year round. And metal corrosion is easily caused under the condition of mine water and oxygen-enriched ventilation in part of coal mines. The types of the mine water with strong corrosivity mainly comprise high-salinity mine water and acid mine water, and the high-salinity mine water is more in main coal producing areas in northern China.
At present, more than 70% of roadways of coal mines in China adopt an anchor rod and anchor cable supporting mode, wherein more than 80% of anchor rod materials are deformed steel bars, and the anchor cable materials are mainly high-strength low-relaxation steel stranded wires. Anchor rod anchor rope material and the material of supporting accessories such as tray, steel band, girder steel are steel, all appear in the colliery in the pit corrosion and fracture inefficacy phenomenon in different degree ground.
The main influence factors of damage and fracture of the anchor rod and the anchor cable comprise working environment, stress state, material and the like, wherein the influence of the environmental factors cannot be ignored. As a metal product, the steel anchor rod is firstly corroded by the environment where the steel anchor rod is located, and the stress state of the anchor rod and the anchor cable is complex and constantly changes along with mining. After corrosion, the mechanical property, the stress state, the fracture form and the fracture characteristics of the anchor rod can be greatly changed, so that the damage and the abnormal fracture (different from the conventional pure mechanical fracture) of the anchor rod and the anchor cable in a corrosive environment are more and more. Along with the complication of mining conditions, in order to realize high-strength support, the material, the processing technology and the initial stress form of the anchor rod are greatly changed, the toughness and the plasticity of the rod body are reduced to a certain degree due to the improvement of the strength, and the initial working state of the rod body is changed due to the application of high prestress. The increasingly complex mining environment further worsens the working state of the anchor rod and aggravates the corrosion damage and even breakage of the rod body.
Therefore, the performance of the anchor rod and anchor cable material in the corrosive environment can be greatly degraded, and the reliability of the anchor rod and anchor cable support is poor, so that the influence of the corrosion factor must be considered when the anchor rod and anchor cable support is carried out in roadways in different corrosive environments, and the support design can be carried out more specifically.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and to provide at least the advantages described hereinafter.
The invention also aims to provide a method for designing a roadway anchor rod and anchor cable support in a corrosive mine environment, which is used for developing the support and protection design of the anchor rod and the anchor cable in a roadway to be supported in a similar environment by combining the stress of the anchor rod and the anchor cable on the basis of fully considering the mine corrosive environment, so that the long-term effectiveness and the long-term stability of an anchor rod and anchor cable support system are ensured.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a method of designing a roadway bolt-and-cable support in a corrosive mine environment, comprising:
taking a water sample in a roadway supported by an existing anchor rod and an anchor cable, and detecting the basic properties of the water sample and the environmental parameters of the roadway;
detecting basic properties of anchor rod and anchor cable materials in a roadway supported by an existing anchor rod and an anchor cable;
configuring corrosion rule experiment parameter conditions based on the detection result of the basic properties of the water sample and the detection results of the basic properties of the anchor rod and the anchor cable material;
acquiring corrosion rules of anchor rods and anchor cables in the roadway supported by the existing anchor rods and anchor cables based on configured corrosion rule experimental parameter conditions;
detecting the stress of an anchor rod and an anchor cable in a roadway supported by the existing anchor rod and anchor cable;
and determining a design scheme of the roadway to be supported based on the corrosion rule of the anchor rod and the anchor cable, the stress of the anchor rod and the anchor cable.
Preferably, the method for designing the roadway anchor rod and anchor cable support in the corrosive mine environment is characterized in that the basic properties of a water sample comprise ionic components, concentration and pH; the roadway environment parameter is the roadway environment temperature.
Preferably, in the design method for roadway anchor rod and anchor cable support in corrosive mine environment, the basic properties of the anchor rod and anchor cable materials include chemical compositions, microstructures and inclusions of the materials.
Preferably, in the design method for roadway anchor rod and anchor cable support in the corrosive mine environment, the corrosion rule comprises corrosion rate and elongation reduction rate.
Preferably, the method for designing the support of the anchor rod and the anchor cable of the roadway in the corrosive mine environment configures experimental parameter conditions of a corrosion law based on the detection result of the basic properties of the water sample and the detection results of the basic properties of the materials of the anchor rod and the anchor cable, and specifically comprises the following steps: preparing corrosive liquid consistent with the basic properties of the water sample, and carrying out corrosion rule experiments on the anchor rods and the anchor cables consistent with the basic properties of the anchor rod and the anchor cable materials in the environment with the temperature consistent with the environment temperature of the detected roadway.
Preferably, the method for designing the roadway anchor rod and anchor cable support in the corrosive mine environment periodically monitors the stress of the anchor rods and the anchor cables in the roadway supported by the existing anchor rods and anchor cables in the whole service process, records all stress values, and takes the maximum stress value of any anchor rod and any anchor cable as the stress of the anchor rods and the anchor cables.
Preferably, the design method for roadway bolt and anchor cable support in corrosive mine environment comprises the following steps:
determining support parameters of anchor rods, anchor cables and the like of a support system of a roadway to be supported, which are similar to the environmental conditions of the roadway supported by the existing anchor rods and anchor cables;
and determining whether the anchor rods and the anchor cables to be supported need to be subjected to anti-corrosion treatment.
Preferably, in the method for designing the support of the anchor rod and the anchor cable for the roadway in the corrosive mine environment, the support parameter of the anchor rod and the anchor cable is the support density of the anchor rod and the anchor cable.
Preferably, in the method for designing the roadway anchor rod and anchor cable support in the corrosive mine environment, the anchor rod and the anchor cable are subjected to anti-corrosion treatment, and specifically, the surfaces of the anchor rod and the anchor cable are coated with zinc-chromium coatings.
Preferably, the method for designing the support of the anchor rod and the anchor cable of the roadway in the corrosive mine environment determines a support design scheme of the roadway to be supported based on the corrosion rule of the anchor rod and the anchor cable, the anchor rod stress and the anchor cable stress, and specifically comprises the following steps:
when the corrosion rate of the anchor rod is more than 0.1 mm/year or/and the elongation percentage reduction rate of the anchor rod is more than 10%, the anchor rod needs to be subjected to anti-corrosion treatment, otherwise, the anchor rod does not need to be subjected to anti-corrosion treatment;
when the corrosion rate of the anchor cable is more than 0.1 mm/year or/and the elongation rate reduction rate of the anchor cable is more than 5%, performing anti-corrosion treatment on the anchor cable, otherwise, not performing the anti-corrosion treatment;
when the stress of 50% or more of the anchor rods in the anchor rods is detected to be greater than 90% of the yield load of the anchor rods, the support density of the anchor rods is increased on the basis of the support density of the anchor rods in the roadway supported by the anchor rods and the anchor cables, otherwise, the support density of the anchor rods is unchanged;
and when detecting that the stress of more than 50 percent of the anchor cables in the anchor cables is greater than 80 percent of the tensile load of the anchor cables, increasing the support density of the anchor cables on the basis of the support density of the anchor cables in the roadway supported by the anchor rods and the anchor cables, otherwise, keeping the support density of the anchor cables unchanged.
The invention at least comprises the following beneficial effects:
aiming at a corrosive mine environment, the method adopts a flow support design, fully considers the roadway environment, establishes a corresponding relation between the roadway corrosive environment and the corrosion grade of the anchor rod and the anchor cable, establishes a corresponding relation between the stress condition of the anchor rod and the anchor cable in the whole service process of the anchor rod and the anchor cable in the roadway and the support density of the anchor rod and the anchor cable, and further provides a design scheme for carrying out more targeted support system and anti-corrosion measures on the roadway to be supported in similar environment, thereby ensuring the long-term effectiveness and the long-term stability of the roadway support system; by adopting anti-corrosion treatment measures or optimizing support materials and parameters and other series measures, the corrosion resistance of the anchor rod and the anchor cable can be greatly improved, the corrosion rate is slowed down, the probability of corrosion failure is reduced, and the reliability and the long-term stability of the roadway support system in a corrosive environment are improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic flow chart of a method for designing a roadway anchor rod and anchor cable support in a corrosive mine environment according to the present invention;
FIG. 2 is a first microstructure test result of the bolt of roadway F of the present invention;
FIG. 3 is a second graph illustrating the microstructure test results of the bolt of roadway F of the present invention;
FIG. 4 is a first microstructure test result of an anchor cable of a roadway F according to the present invention;
fig. 5 is a second test result of the microstructure of the anchor cable of the roadway F according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
In the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a design method of a roadway bolt-anchor cable support in a corrosive mine environment, which comprises:
collecting a water sample of a roadway roof, detecting basic properties of the water sample, detecting to obtain the pH value of the water sample, and analyzing to obtain the ionic components in the water sampleAnd ion concentration as anion Cl - 、HCO 3 - And SO 4 2- Mainly comprises the following steps of; the method comprises the following steps of detecting the environmental temperature of the roadway supported by the existing anchor rods and anchor cables, and in practical application, detecting the environmental humidity of the roadway at the same time; the detection method of the basic properties of the water sample and the roadway environmental parameters is completed by adopting a detection method in the prior art; the method is based on the actual environment of the roadway as a research foundation, the influence of environmental factors on the support is fully considered, the more targeted support design of the roadway is carried out, and the long-term effectiveness and the stability of the roadway support system are improved;
102, detecting basic properties of anchor rod and anchor cable materials in a roadway supported by an existing anchor rod and an anchor cable; the basic properties of the anchor rod and the anchor cable comprise chemical compositions, microstructures and inclusions of the materials; respectively detecting the basic properties of the anchor rod and the anchor cable which are used in the roadway by adopting a conventional technical means, and respectively detecting according to corresponding test standards;
103, configuring corrosion law experiment parameter conditions based on the detection result of the basic properties of the water sample and the detection results of the basic properties of the anchor rod and the anchor cable material: preparing corrosive liquid consistent with the basic properties of a water sample, and carrying out corrosion rule experiments on the anchor rods and the anchor cables consistent with the basic properties of the anchor rod and the anchor cable materials in the environment of consistent temperature with the environment temperature of the roadway to be detected; according to the test results of the steps 101 and 102, preparing a corrosive liquid consistent with the water quality environment of the mine roadway, and carrying out laboratory tests on anchor rods and anchor cables made of the same materials by using the prepared corrosive liquid in the environment consistent with the water quality environment and the temperature environment of the roadway;
104, acquiring corrosion rules of the anchor rods and the anchor cables in the roadway supported by the existing anchor rods and the anchor cables based on configured corrosion rule experimental parameter conditions; the corrosion rule comprises corrosion rate and elongation reduction rate;
the corrosion rate is detected and obtained by adopting a polarization curve method, the corrosion depth in unit time is expressed as (mm/a), a polarization curve of the anchor rod or the anchor cable in the corrosive liquid is obtained through a potential polarization experiment, and the corrosion current density of the anchor rod or the anchor cable is further analyzed and obtainedi corr Calculating the corrosion rate of the anchor rod or the anchor cable according to the formula (1)V：
V=（i corr *A）/（n*ρ × F) (mm/year) =3.27 × 10 -3 i corr N/[ rho ] mm/year (mm/a) (1)
Wherein,Ais the molar mass of steel: (A=56g/mol）；nIs the valence state of the metal ion (n = 2);Fthe Faraday constant (96485C/mol or 26.8A × h),i corr is the corrosion current density; rho is the density of steel g/cm 3 （ρ=7.85g/cm 3 ) (ii) a N = a/N; the anchor rod and the anchor cable are made of steel, so the anchor rod and the anchor cable are made of steelA、nThe values of rho are determined by steel;
according to GB/T228.1-2010 "first part of metallic Material tensile experiment: room temperature test method for calculating post-fracture elongation of anchor rod or anchor cableAThe formula is shown as formula (2):
A = （L - L 0 ）/ L 0 × 100% (2)
wherein,L 0 the length of the original gauge length is used as the length of the original gauge length,Lthe length of the gauge length after the fracture.
So as to respectively calculate the elongation of the anchor rod or the anchor cable stretched in the air under the same stretching speedA 0 And elongation by stretching in an etching solutionA BCC And calculating the elongation of the anchor rod or the anchor cable by the formula (3).
I =（A 0 –A BCC ）/ A 0 ×100% (3)
Wherein,Iin order to reduce the rate of elongation,A 0 is the elongation in the air, and is,A BCC is the elongation in the etching solution.
the whole service process is the process from the completion of the construction of the support system to the scrapping of the support system of the roadway with the existing anchor rods and anchor cables; in the whole service process of a support system, selecting a certain proportion of anchor rods and anchor cables as monitoring objects, carrying out field detection on the stress of the anchor rods and the anchor cables (the monitoring objects) at intervals, carrying out detection once every day on a mining roadway with a short service life, carrying out detection once a month on a permanent roadway with a long service life, and counting all stress values obtained by detection in the whole service process for any anchor rod and any anchor cable, wherein the maximum stress value is the stress of the anchor rod or the anchor cable;
106, determining a design scheme of a roadway to be supported based on the corrosion rule of the anchor rod and the anchor cable, the bolt stress and the anchor cable stress, namely determining the support density of the anchor rod and the anchor cable of a support system of the roadway to be supported, which is similar to the environmental condition of the roadway supported by the existing anchor rod and anchor cable, and determining whether the anchor rod and the anchor cable to be supported need to be subjected to anti-corrosion treatment, specifically:
when the corrosion rate of the anchor rod is more than 0.1 mm/year or/and the elongation percentage reduction rate of the anchor rod is more than 10%, the anchor rod needs to be subjected to anti-corrosion treatment, otherwise, the anchor rod does not need to be subjected to anti-corrosion treatment;
when the corrosion rate of the anchor cable is more than 0.1 mm/year or/and the elongation rate reduction rate of the anchor cable is more than 5%, performing anti-corrosion treatment on the anchor cable, otherwise, not performing the anti-corrosion treatment;
when the stress of 50% or more of the anchor rods in the anchor rods is detected to be greater than 90% of the yield load of the anchor rods, the support density of the anchor rods is increased on the basis of the support density of the anchor rods in the roadway supported by the anchor rods and the anchor cables, otherwise, the support density of the anchor rods is unchanged;
when detecting that the stress of 50% or more of the anchor cables in the anchor cables is greater than 80% of the tensile load of the anchor cables, increasing the support density of the anchor cables on the basis of the support density of the anchor cables in the roadway supported by the anchor rods and the anchor cables, otherwise, keeping the support density of the anchor cables unchanged;
the anchor rod and the anchor cable are subjected to anti-corrosion treatment, and specifically, a zinc-chromium coating or an epoxy resin coating is coated on the surfaces of the anchor rod and the anchor cable.
According to the detection results of the steps 104 and 105, determining whether the supporting scheme of the roadway to be supported (the mine environment of the roadway is similar to the roadway environment of the existing anchor rod and anchor cable support) needs to be subjected to anti-corrosion treatment or not, which is determined according to the corrosion rule condition of the anchor rods and the anchor cables in the mine environment, and is specifically:
1. design of anti-corrosion treatment measures
Judging the condition a, and judging according to the following corrosion grade division conditions, when the corrosion rate of the anchor rod and the anchor cable is more than 0.1 mm/year, the corrosion resistance grade of the anchor rod and the anchor cable in the mine roadway is still corroded, namely, the corrosion condition exists, and the mechanical properties, stress states, fracture forms and characteristics and the like of the anchor rod and the anchor cable after corrosion are influenced to a certain extent, so that in order to ensure the support effectiveness of the anchor rod and the anchor cable, when the corrosion rate is more than 0.1 mm/year (the corrosion resistance grade is more than 5 grades), the anchor rod and the anchor cable need to be subjected to corrosion prevention treatment;
the corrosion resistance of metal materials in the Chinese society for corrosion and protection, metal anticorrosion manual, is classified into 10 grades:
level 1: less than 0.001 mm/year, complete corrosion resistance;
and 2, stage: 0.001-0.005 mm/year, corrosion resistance;
and 3, level: 0.005-0.01 mm/year, corrosion resistance;
4, level: 0.01-0.05 mm/year, corrosion resistant;
and 5, stage: 0.05-0.1 mm/year, corrosion resistant;
and 6, level: 0.1-0.5 mm/year, corrosion resistant;
and 7, stage: 0.5-1.0 mm/year, corrosion resistant;
and 8, stage: 1.0-5.0 mm/year, and is not corrosion resistant;
and 9, stage: 5.0-10.0 mm/year, and is not corrosion resistant;
10 level: greater than 10.0 mm/year, and is not corrosion resistant.
Judging the condition b, wherein the elongation is the percentage of the ratio of the total deformation delta L of the gauge length section after the tensile fracture of the sample to the original gauge length L, the more the elongation of the anchor rod and the anchor cable in the corrosive liquid is reduced compared with the elongation in the air, the lower the plasticity of the anchor rod and the anchor cable on the surface in the mine roadway is, the higher the probability of stress corrosion crack generation and the crack propagation rate are caused in the mine roadway due to the low plasticity, and the higher the fracture risk is, so when the elongation is reduced to a certain degree, the anchor rod and the anchor cable need to be subjected to anti-corrosion treatment, and when the elongation reduction rate of the anchor rod is more than 10 percent and the elongation reduction rate of the anchor cable is more than 5 percent, the anchor rod and the anchor cable need to be subjected to anti-corrosion treatment;
in summary, if the anchor rod and the anchor cable meet any one of the determination conditions a and b, it is determined that the anchor rod and the anchor cable have a risk of corrosion failure in the corrosive environment of the mine roadway, and the anchor rod and the anchor cable need to be subjected to anti-corrosion treatment, and all the anchor rods and the anchor cables to be supported are subjected to anti-corrosion treatment;
according to the invention, comparison tests of different treatment methods are carried out according to the long-term protection effects of different corrosion protection means and the combination of cost and the like. Through the stability, the water resistance, the corrosion degree and the like of the surface coating in the test process, the zinc-chromium coating is determined to be adopted for carrying out the surface treatment on the anchor rod and the anchor cable, and the three functions of water isolation, passivation and cathodic protection are simultaneously played, so that the corrosion is effectively slowed down.
TABLE 1 determination conditions for whether anchor rods and anchor cables are subjected to anti-corrosion treatment
2. Design of support parameters of anchor rod and anchor cable of support system
According to engineering practice, the probability of stress corrosion fracture of the anchor rod anchor cable under the action of high stress and mine water corrosion is very high, and the method is the most main reason for fracture failure of the anchor rod anchor cable under a coal mine. The mechanism of stress corrosion fracture is complex, but the stress level of the corrosive medium mine water and the anchor rod and anchor rope is the most important factor. Therefore, in addition to the corrosion rule of the anchor rod and anchor cable material, the stress level of the anchor rod and anchor cable is another important condition for judging the risk of stress corrosion fracture.
And c, taking 90% of yield load of the anchor rod and 80% of tensile load of the anchor cable as standards, and taking the standards as field monitoring critical values for judging the fracture risk of the anchor rod and the anchor cable in the corrosive environment, namely, if 50% or more of the anchor rod and the anchor cable in a monitored object exceed the critical values, the anchor rod and the anchor cable have stress corrosion fracture risks, and then the support density of the anchor rod and the anchor cable needs to be increased on the basis of support parameters of a roadway supported by the existing anchor rod and the anchor cable, so that the stress level of a single anchor rod and the single anchor cable is reduced, and the increase of the support density of the anchor rod and the anchor cable is better when the stress of the anchor rod and the anchor cable is more than 50% and less than the critical values (the actual calculation can be carried out according to the stress of the monitored object, so that the stress of more than 50% of the anchor rod or the anchor cable is less than the critical values).
TABLE 2 determination of increase in anchor bolt and anchor cable support density
And (6) carrying out support construction on the roadway to be supported according to the support design scheme in the step 106, and monitoring the corrosion condition and the stress condition of the anchor rod and the anchor cable in real time in the mine operation process after the construction is finished, so as to evaluate the protection effect and the support rationality. And in the real-time monitoring process, according to the stress conditions of the anchor rod and the anchor cable, according to the judgment standard, properly adjusting the support parameters, if the stress conditions of the anchor rod and the anchor cable are relatively poor in the mine operation process after the construction is finished, and the judgment condition c is met, adding the anchor rod and the anchor cable for supporting so as to ensure the safety and the stability of the supporting system.
< example 1>
The technical scheme of the invention is further explained by taking a certain northwest mine as an example:
the tunnel (the recovery tunnel, is in service for 3 years) of a certain mine in northwest of the west of the existing anchor rod and anchor cable support, the top plate has water drenching in the whole service process, the environment humidity is high, and the tunnel support anchor rod, the anchor cable, a tray, a metal mesh and other components are obviously corroded. In a coal pillar entry retaining roadway, the phenomenon that part of anchor rods and anchor cables are broken occurs in the roadway under the influence of strong mining, and the roadway is greatly deformed. Carrying out anchor rod and anchor cable support design on a roadway to be constructed, which is similar to the roadway F in environment;
(1) The roof water of the mine tunnel F was sampled and subjected to water quality testing (mineralization level, ionic composition and concentration, pH), while testing the mine tunnel ambient temperature, with the test results shown in table 3:
TABLE 3 mine Water quality test results
From Table 3, it can be seen that the mineralization of the mine water is more than 1000mg/L, pH and is 8.2, and the mine water is judged to be alkaline high-salinity water; the anion is Cl-HCO 3 - And SO 4 2- Mainly, the amount concentration of the converted substances is 9.06, 7.01 and 4.23mmol/L respectively. The temperature of the underground environment of the mine is kept at about 25 ℃ (23-27 ℃) and the humidity is about 85% (80-90%).
(2) Testing basic properties of the anchor rod and the anchor cable in the roadway F (including chemical components, microstructures and inclusions of materials), wherein the test results of the chemical components of the materials of the anchor rod and the anchor cable are respectively shown in tables 4 and 5, the test results of the microstructures are respectively shown in a table 2~3 and a table 4~5, the test results of the inclusions are respectively shown in a table 6 and a table 7, and the anchor rod is hot-rolled 500;
TABLE 4 chemical composition of Anchor rods
TABLE 5 chemical composition of Anchor rope
TABLE 6 evaluation of inclusions in anchor Material
Table 7 anchor cable inclusion rating
(3) According to the water quality test results in the table 3, preparing an experimental solution as a corrosion solution for corrosion law experiments, and performing corrosion law experiments on the anchor rod and the anchor cable which are made of the same materials as the anchor rod and the anchor cable in the roadway F, wherein the corrosion rate of the anchor rod is 0.14 mm/year, the elongation percentage reduction rate of the anchor rod is 13%, the corrosion rate of the anchor cable is 0.017 mm/year, and the elongation percentage reduction rate of the anchor cable is 9.4%;
(4) Taking 30 roof anchor rods, 20 roof anchor cables, 30 anchor rods and 20 anchor cables of a tunnel F roof for stress monitoring, reading monitoring data once a day by adopting a continuous monitoring mode, recording all monitoring data of any anchor rod and any anchor cable, and taking the maximum value as a stress monitoring result, wherein the stress of more than 30 anchor rods (stress monitoring result) is more than 90% of the yield load of the anchor rods in the whole service process; the number of the anchor cables which are stressed by 80 percent more than the tensile load of the anchor cables is less than 20.
(5) Based on the test results of the above (3) and (4), designing the support of a roadway E (roadway environment parameters are similar to those of the roadway F) to be supported of a certain northwest mine according to the judgment condition a, the judgment condition b and the judgment condition c, wherein the specific support design is as follows:
performing anti-corrosion treatment on all anchor rods and anchor cables to be supported, and specifically coating zinc-chromium coatings on the surfaces of the anchor rods and the anchor cables;
and (4) increasing the support density of the anchor rods on the basis of the support system of the roadway F, wherein the support density of the anchor cables is unchanged.
The monitoring is carried out after the construction of the supporting system of the roadway E, and the field test and the monitoring show that after the stress of the anchor rod and the anchor cable is influenced by the extraction of the working face, the stress is not increased greatly and is stabilized quickly, the overall deformation of the roadway is controlled well, the phenomena of obvious corrosion and breakage of the anchor rod and the anchor cable do not occur, the phenomena of stress corrosion and fracture of the anchor rod and the anchor cable do not occur, and the test effect is good.
The method comprehensively considers the actual environment of the roadway and the stress condition in the supporting process of the anchor rod and the anchor cable, carries out the evaluation of the corrosion degree and the long-term stability of the supporting system based on the current environment and materials, predicts the long-term mechanical property evolution and the stability of the anchor rod and the anchor cable in the mine environment, and provides the protection suggestions of the anchor rod and the anchor cable for different roadways.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (4)
1. A method for designing a roadway anchor rod and anchor cable support in a corrosive mine environment is characterized by comprising the following steps:
taking a water sample in a roadway supported by an existing anchor rod and an anchor cable, and detecting the basic properties of the water sample and the environmental parameters of the roadway;
detecting basic properties of anchor rod and anchor cable materials in a roadway supported by an existing anchor rod and an anchor cable;
configuring corrosion rule experiment parameter conditions based on the detection result of the basic properties of the water sample and the detection results of the basic properties of the anchor rod and the anchor cable material;
acquiring corrosion rules of anchor rods and anchor cables in the roadway supported by the existing anchor rods and anchor cables based on configured corrosion rule experimental parameter conditions; the corrosion rule comprises corrosion rate and elongation reduction rate;
detecting the stress of an anchor rod and an anchor cable in a roadway supported by the existing anchor rod and anchor cable; regularly monitoring the stress of the anchor rods and the anchor cables in the roadway supported by the existing anchor rods and the anchor cables in the whole service process, recording all stress values, and taking the maximum stress value of any anchor rod and any anchor cable as the stress of the anchor rods and the anchor cables;
determining a design scheme of a roadway to be supported based on the corrosion rule of the anchor rod and the anchor cable, the stress of the anchor rod and the stress of the anchor cable, wherein the support design scheme comprises the following steps: determining support parameters of an anchor rod and an anchor cable of a support system of a roadway to be supported, which are similar to the environmental conditions of the roadway supported by the existing anchor rod and the anchor cable, wherein the support parameters of the anchor rod and the anchor cable are the support density of the anchor rod and the anchor cable; determining whether the anchor rod and the anchor cable to be supported need to be subjected to anti-corrosion treatment, wherein the anti-corrosion treatment of the anchor rod and the anchor cable is specifically to coat a zinc-chromium coating on the surfaces of the anchor rod and the anchor cable;
determining a supporting design scheme of a roadway to be supported based on the corrosion rule of the anchor rod and the anchor cable, the anchor rod stress and the anchor cable stress, and specifically comprising the following steps:
when the corrosion rate of the anchor rod is more than 0.1 mm/year or/and the elongation percentage reduction rate of the anchor rod is more than 10%, the anchor rod needs to be subjected to anti-corrosion treatment, otherwise, the anchor rod does not need to be subjected to anti-corrosion treatment;
when the corrosion rate of the anchor cable is more than 0.1 mm/year or/and the elongation rate reduction rate of the anchor cable is more than 5%, performing anti-corrosion treatment on the anchor cable, or not;
when the stress of 50% or more of the anchor rods in the anchor rods is detected to be greater than 90% of the yield load of the anchor rods, the support density of the anchor rods is increased on the basis of the support density of the anchor rods in the roadway supported by the anchor rods and the anchor cables, otherwise, the support density of the anchor rods is unchanged;
and when detecting that the stress of 50% or more of the anchor cables in the anchor cables is greater than 80% of the tensile load of the anchor cables, increasing the support density of the anchor cables on the basis of the support density of the anchor cables in the roadway supported by the anchor rods and the anchor cables, otherwise, keeping the support density of the anchor cables unchanged.
2. A method of designing a roadway bolt and cable support in a corrosive mine environment as claimed in claim 1, wherein the basic properties of the water sample include ionic composition, concentration and pH; the roadway environment parameter is the roadway environment temperature.
3. A method of designing a roadway bolt and cable support in a corrosive mine environment as claimed in claim 1, wherein the basic properties of the bolt and cable material include the chemical composition, microstructure and inclusions of the material.
4. The method for designing a roadway anchor rod-anchor cable support in a corrosive mine environment according to claim 3, wherein based on the detection result of the basic properties of the water sample and the detection result of the basic properties of the anchor rod and the anchor cable material, corrosion law experimental parameter conditions are configured, specifically: preparing corrosive liquid consistent with the basic properties of the water sample, and carrying out corrosion rule experiments on the anchor rods and the anchor cables consistent with the basic properties of the anchor rod and the anchor cable materials in the environment with the temperature consistent with the environment temperature of the roadway to be detected.
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| CN110044740A (en) * | 2019-04-22 | 2019-07-23 | 东南大学 | Measuring method, application, device and the fixture of cable steel wire corrosion fatigue damage rule |
| CN111272553A (en) * | 2020-03-16 | 2020-06-12 | 天地科技股份有限公司 | Anchor rod stress corrosion test device, in-situ mechanical test system and method |
| CN111927511A (en) * | 2020-07-29 | 2020-11-13 | 安徽理工大学 | Steel pipe anchor cable end blasting and grouting combined supporting method and system |
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| CN103984625A (en) * | 2014-05-12 | 2014-08-13 | 浪潮电子信息产业股份有限公司 | System robustness testing method based on use rate analysis |
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| CN110044740A (en) * | 2019-04-22 | 2019-07-23 | 东南大学 | Measuring method, application, device and the fixture of cable steel wire corrosion fatigue damage rule |
| CN111272553A (en) * | 2020-03-16 | 2020-06-12 | 天地科技股份有限公司 | Anchor rod stress corrosion test device, in-situ mechanical test system and method |
| CN111927511A (en) * | 2020-07-29 | 2020-11-13 | 安徽理工大学 | Steel pipe anchor cable end blasting and grouting combined supporting method and system |
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