CN115577567B - Deep underground engineering rock burst prevention and control method and system - Google Patents
Deep underground engineering rock burst prevention and control method and system Download PDFInfo
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Abstract
The invention relates to a deep underground engineering rockburst prevention method and system, and relates to the technical field of underground engineering safety. The method comprises the following steps: carrying out a deep rock burst test to obtain the rock burst peak stress of the surrounding rock, carrying out a rock mechanical property test to obtain stress-strain data and peak strain of the surrounding rock; determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain; determining the rock burst grade of the surrounding rock according to the rock burst energy; and determining a corresponding surrounding rock burst control design scheme according to the rock burst grade. By adopting the method and the device, the surrounding rock burst control measures can be taken pertinently, and the rock burst occurrence risk is reduced.
Description
Technical Field
The application relates to the technical field of underground engineering safety, in particular to a deep underground engineering rockburst prevention method and system.
Background
Coal resources buried deep by over kilometers in China account for about 53% of the detected reserves, the coal resources are strategic guarantees of main energy in China, and coal mining is a necessary trend towards deep development along with exhaustion of shallow coal resources. However, because deep mine roadways face complex mechanical environments of high ground stress, high ground temperature, high karst water pressure and strong mining disturbance, namely three-high-one disturbance, rock mass dynamic disaster accidents represented by rock burst are frequent. The essence of rock burst lies in the sudden release of energy accumulated in surrounding rocks, and the phenomenon that rocks burst and are ejected is usually accompanied, so that great threat is brought to constructors and equipment, the construction cost is increased, and the construction progress is influenced. However, the existing commonly used surrounding rock control method does not consider the relation between the rock burst energy and the surrounding rock support design, so that the rock burst control effect is not ideal.
Disclosure of Invention
In view of the above, it is necessary to provide a deep underground engineering rockburst prevention method and system.
In a first aspect, a deep underground engineering rockburst prevention method is provided, and the method includes:
carrying out a deep rock burst test to obtain the rock burst peak stress of the surrounding rock, carrying out a rock mechanical property test to obtain stress-strain data and peak strain of the surrounding rock;
determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain;
determining the rock burst grade of the surrounding rock according to the rock burst energy;
and determining a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade.
As an optional implementation manner, the determining the rockburst energy of the surrounding rock according to the rockburst peak stress, the stress-strain data and the peak strain includes:
determining energy corresponding to the rock mass rock burst peak stress of the surrounding rock according to the rock burst peak stress and the peak strain;
determining energy required by rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain;
and determining the difference value of the energy corresponding to the rock burst peak stress of the rock mass and the energy required by the rock mass to be destroyed as the rock burst energy of the surrounding rock.
As an optional implementation manner, the formula for determining the energy corresponding to the rock mass peak bursting stress of the surrounding rock according to the rock burst peak bursting stress and the peak strain is as follows:
wherein the content of the first and second substances,
represents the energy corresponding to the rock mass rock burst peak stress>
Represents the peak stress of the rock burst and is greater or less than>
Indicating the peak strain.
As an alternative embodiment, the formula for determining the energy required for rock mass failure of the surrounding rock according to the stress-strain data and the peak strain is as follows:
wherein, the first and the second end of the pipe are connected with each other,
represents the energy needed by the rock mass destruction and is used for judging whether the rock mass is damaged>
Represents peak strain, <' > based on>
Indicates stress, < >>
Representing strain.
As an optional implementation manner, the determining the rock burst grade of the surrounding rock according to the rock burst energy includes:
if the rock burst energy is smaller than or equal to a first preset threshold value, determining that the rock burst grade of the surrounding rock is rock burst-free;
if the rock burst energy is larger than a first preset threshold and smaller than or equal to a second preset threshold, determining that the rock burst grade of the surrounding rock is slight rock burst;
if the rock burst energy is larger than a second preset threshold and smaller than or equal to a third preset threshold, determining that the rock burst grade of the surrounding rock is medium rock burst;
and if the rock burst energy is greater than a third preset threshold and less than or equal to a fourth preset threshold, determining that the rock burst grade of the surrounding rock is strong rock burst.
As an optional implementation manner, the determining, according to the rock burst level, a surrounding rock burst control design scheme corresponding to the surrounding rock includes:
if the rock burst grade is slight rock burst, determining that the corresponding surrounding rock burst control design scheme of the surrounding rock is as follows:
after the surrounding rock excavation is finished, spraying concrete;
installing an antiknock flexible net;
and installing an energy-absorbing anchor rod and an anchor cable, and quickly applying high prestress.
As an optional implementation manner, the determining, according to the rock burst level, a surrounding rock burst control design scheme corresponding to the surrounding rock includes:
if the rock burst grade is medium rock burst, determining that the design scheme of the surrounding rock burst control corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a steel arch frame;
and installing an energy-absorbing anchor rod and an anchor cable, and quickly applying high prestress.
As an optional implementation manner, the determining, according to the rock burst level, a surrounding rock burst control design scheme corresponding to the surrounding rock includes:
if the rock burst grade is strong rock burst, determining that the surrounding rock burst control design scheme corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a confined concrete arch frame;
and installing energy-absorbing anchor rods and anchor cables with high anchoring and supporting density and quickly applying high prestress.
As an alternative embodiment, the support material of the energy-absorbing anchor rods and the energy-absorbing anchor cables is an ideal elastic plastic material, and has the characteristics of high prestress, high constant resistance, high energy absorption and high elongation.
In a second aspect, there is provided a deep underground engineering rockburst prevention system, the system comprising:
the deep rock burst test device is used for carrying out a deep rock burst test on surrounding rocks;
the rock mechanical property testing device is used for carrying out rock mechanical property testing on the surrounding rock;
the main control device is used for acquiring rock burst peak stress of the surrounding rock in the deep rock burst test, and stress-strain data and peak strain in the rock mechanical property test;
the main control device is further used for determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain;
the main control device is also used for determining the rock burst grade of the surrounding rock according to the rock burst energy;
and the main control device is also used for determining a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade.
As an optional implementation manner, the master control device is specifically configured to:
determining energy corresponding to the rock burst peak stress of the surrounding rock according to the rock burst peak stress and the peak strain;
determining energy required by rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain;
and determining the difference value of the energy corresponding to the rock burst peak stress of the rock mass and the energy required by the rock mass to be destroyed as the rock burst energy of the surrounding rock.
As an optional implementation manner, the master control device is specifically configured to:
if the rock burst energy is smaller than or equal to a first preset threshold value, determining that the rock burst grade of the surrounding rock is rock burst-free;
if the rock burst energy is larger than a first preset threshold and smaller than or equal to a second preset threshold, determining that the rock burst grade of the surrounding rock is slight rock burst;
if the rock burst energy is larger than a second preset threshold and smaller than or equal to a third preset threshold, determining that the rock burst grade of the surrounding rock is medium rock burst;
and if the rock burst energy is greater than a third preset threshold and less than or equal to a fourth preset threshold, determining that the rock burst grade of the surrounding rock is strong rock burst.
As an optional implementation manner, the master control device is specifically configured to:
if the rock burst grade is slight rock burst, determining that the design scheme of the surrounding rock burst control corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, spraying concrete;
installing an anti-explosion flexible net;
and installing energy-absorbing anchor rods and anchor cables and quickly applying high prestress.
As an optional implementation manner, the master control device is specifically configured to:
if the rock burst grade is medium rock burst, determining that the surrounding rock burst control design scheme corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a steel arch frame;
and installing energy-absorbing anchor rods and anchor cables and quickly applying high prestress.
As an optional implementation manner, the master control device is specifically configured to:
if the rock burst grade is strong rock burst, determining that the surrounding rock burst control design scheme corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a confined concrete arch frame;
and installing energy-absorbing anchor rods and anchor cables with high anchoring and supporting density and quickly applying high prestress.
As an alternative embodiment, the support material of the energy-absorbing anchor rod and the energy-absorbing anchor cable is an ideal elastic plastic material, and has the characteristics of high prestress, high constant resistance, high energy absorption and high elongation rate.
In a third aspect, a computer device is provided, comprising a memory having stored thereon a computer program operable on a processor, and the processor when executing the computer program, performs the method steps according to the first aspect.
In a fourth aspect, a computer-readable storage medium is provided, having stored thereon a computer program which, when being executed by a processor, carries out the method steps of the first aspect.
The application provides a deep underground engineering rock burst prevention and control method and system, and the technical scheme provided by the embodiment of the application at least brings the following beneficial effects:
firstly, under the condition of developing a deep rock burst test, the computer equipment acquires the rock burst peak stress of surrounding rocks, and under the condition of developing a rock mechanical property test, the computer equipment acquires the stress-strain data and the peak strain of the surrounding rocks. And then, the computer equipment determines the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain, and determines the rock burst grade of the surrounding rock according to the rock burst energy. And finally, the computer equipment determines a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade so as to prevent and control the rock burst. The method and the device can determine the rock burst energy of the surrounding rock and establish the relation between the rock burst energy and the surrounding rock support design, so that the surrounding rock burst control design scheme is determined in a targeted manner, the risk of rock burst is reduced, and the rock burst prevention and control effect is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a technical route diagram of a deep underground engineering rockburst prevention method according to an embodiment of the present application;
FIG. 2 is a flow chart of a deep underground engineering rockburst prevention method provided by an embodiment of the application;
FIG. 3 is a schematic diagram of a rock burst energy calculation model according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an evolution process of a rock burst stress path before and after a surrounding rock support according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a deep underground engineering rock burst prevention and treatment system provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
In coal mining, surrounding rocks of a roadway or an underground chamber are generally required to be supported so as to improve the strength of rock mass and reduce the risk of dynamic disasters such as rock burst. The deep underground engineering rock burst prevention and control method provided by the embodiment of the application can be applied to the design process of surrounding rock burst prevention and control of roadway or chamber excavation and tunneling in coal mining. Firstly, rock burst peak stress, stress strain data and peak strain of surrounding rock are obtained through a deep rock burst test and a rock mechanical property test, and then rock burst energy released by the surrounding rock when rock burst occurs is determined. And then, judging the rock burst grade of the surrounding rock by taking the rock burst energy as a criterion, and designing a surrounding rock supporting scheme aiming at the rock burst grade, thereby establishing a relation between the rock burst energy and the surrounding rock supporting design and determining a surrounding rock burst control design scheme aiming at the rock burst grade. Fig. 1 is a technical route diagram of a deep underground engineering rockburst prevention method provided in an embodiment of the present application, and as shown in fig. 1, a specific processing procedure is as follows:
carrying out a deep rock burst test to obtain the rock burst peak stress of the surrounding rock;
carrying out rock mechanical property test to obtain stress-strain data, peak strain, tensile strength and compressive strength of the surrounding rock;
determining rock mass rock burst energy of surrounding rocks according to the rock burst peak stress, the stress strain data and the peak strain;
determining a Mohr-Coulomb rock mass strength envelope curve of the surrounding rock according to the tensile strength and the compressive strength of the rock mass;
carrying out rock burst grade evaluation on surrounding rocks according to rock burst energy, wherein the rock burst grade comprises no rock burst, slight rock burst, medium rock burst and strong rock burst;
and carrying out rock burst control design according to the rock burst grade of the surrounding rock and the Mohr-Coulomb rock mass strength criterion, and pertinently adopting surrounding rock supporting measures to enable the Mohr-Coulomb rock mass strength envelope curve of the surrounding rock to move outwards so as to reduce the rock burst occurrence risk.
A deep underground engineering rockburst prevention and control method provided by the embodiment of the present application will be described in detail below with reference to specific embodiments, and fig. 2 is a flowchart of the deep underground engineering rockburst prevention and control method provided by the embodiment of the present application, and as shown in fig. 2, the specific steps are as follows:
step 201, a deep rock burst test is carried out to obtain rock burst peak stress of surrounding rocks, and a rock mechanical property test is carried out to obtain stress-strain data and peak strain of the surrounding rocks.
In the implementation, in order to obtain rock mass mechanical property parameters of underground engineering, the surrounding rocks of the underground engineering can be sampled on site, and rock mass test pieces are manufactured to carry out deep rock burst tests and rock mechanical property tests. Under the condition of carrying out a deep rock rockburst test, the computer equipment acquires the rockburst peak stress of the surrounding rock, and under the condition of carrying out a rock mechanical property test, the computer equipment acquires stress-strain data and peak strain of the surrounding rock. Preferably, the deep rock burst test is a true triaxial rock burst test, and the rock mechanical property test is an indoor compression test. When the rock mechanical property test adopts a uniaxial compression test, the peak strain can be the strain corresponding to the uniaxial compressive strength.
And 202, determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain.
In implementation, assuming that the ultimate strain value of the rock body is equal to the ultimate strain value (namely, peak strain) in the rock mechanical property test when the rock burst occurs, the computer equipment can determine the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain. Preferably, fig. 3 is a schematic diagram of a rock burst energy calculation model provided in an embodiment of the present application, and as shown in fig. 3, when the rock mechanical property test is a uniaxial compression test, the stress-strain data may be represented by a uniaxial compression curve, and the computer device is configured to calculate the peak stress of the rock burst according to the surrounding rock
Stress-strain data (i.e., uniaxial compression curve) and peak strain @>
The energy corresponding to the rock burst peak stress when the surrounding rock is rockburst can be determined>
And the energy required by the destruction of the rock mass->
. Wherein the energy corresponding to the rock burst peak stress is->
Can be equivalent to the origin>
And &>
The area of a triangle surrounded by the three points; the energy needed by the rock mass destruction is->
Can be equivalent to a strain on the abscissa of 0 and peak>
(uniaxial compression resistance) strength->
Corresponding strain) and the area enclosed by the x-axis. The energy released by the rock burst comes from the energy of the rock mass at the rock burst occurrence moment (the energy can be equivalent to the energy corresponding to the rock burst peak stress of the surrounding rock during the rock burst->
) And when the rock burst happens, the process of rock mass destruction can absorb certain energy (the energy can be equivalent to the energy required by the rock mass destruction->
) Therefore, the corresponding energy of the rock burst peak stress can be->
The energy required by the damage to the rock mass>
Is determined as the energy of the rock burst of the surrounding rock∆E。
As an alternative embodiment, the processing procedure of determining the rock burst energy of the surrounding rock by the computer device according to the rock burst peak stress, the stress-strain data and the peak strain is as follows:
step one, determining energy corresponding to rock burst peak stress of a rock body of surrounding rock according to the rock burst peak stress and the peak strain.
In implementation, the computer equipment determines the energy corresponding to the rock mass and rock burst peak stress of the surrounding rock according to the rock burst peak stress and the peak strain. Preferably, the computer device adopts a rock burst energy calculation model shown in FIG. 3, and the energy corresponding to the rock burst peak stress
Equivalent as the origin point>
And &>
And determining the formula of the energy corresponding to the rock mass rockburst peak stress of the surrounding rock according to the area of the triangle surrounded by the three points and the rock burst peak stress and the peak strain by the computer equipment, wherein the formula comprises the following steps:
wherein the content of the first and second substances,
represents the energy corresponding to the rock mass rock burst peak stress>
Represents the peak stress of the rock burst and is greater or less than>
Indicating the peak strain.
And step two, determining the energy required by rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain.
In practice, the computer device determines the energy required for rock mass failure of the surrounding rock from the stress-strain data and the peak strain. Preferably, the computer equipment adopts a rock burst energy calculation model shown in FIG. 3, and the energy required by rock mass destruction
Equivalent is that the abscissa is at 0 and the peak strain->
The area enclosed by the uniaxial compression curve and the x axis between the two, and the computer equipment determines the formula of the energy required by the rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain as follows:
wherein the content of the first and second substances,
represents the energy required for the destruction of the rock mass>
Represents peak strain, <' > based on>
Indicates stress, < >>
Indicating strain.
And step three, determining the difference between the energy corresponding to the rock burst peak stress of the rock mass and the energy required by rock mass destruction as the rock burst energy of the surrounding rock.
In the implementation, the computer equipment can determine the difference value of the energy corresponding to the rock mass rock burst peak stress and the energy required by rock mass destruction as the rock burst energy released when the surrounding rock is in rock burst.
And step 203, determining the rock burst grade of the surrounding rock according to the rock burst energy.
In implementations, the computer device may determine a rock burst level of the surrounding rock from the rock burst energy. Wherein the grade of a rockburst may include no-burst, light burst, medium burst, and strong burst. It should be noted that the rock burst grade is judged by taking the rock burst energy as a criterion, and rock bursts with different degrees can be distinguished more visually, so that a surrounding rock burst control design scheme determined according to the rock burst grade in the follow-up process is more consistent with the actual required supporting strength of a deep underground engineering site.
As an alternative embodiment, in order to accurately determine the rock burst grade according to the rock burst energy, the processing procedure of the computer device for determining the rock burst grade of the surrounding rock according to the rock burst energy is as follows:
step one, if the rock burst energy is smaller than or equal to a first preset threshold value, determining that the rock burst grade of the surrounding rock is rock burst-free. Preferably, the first preset threshold is 0kJ/m 3 。
And step two, if the rock burst energy is greater than the first preset threshold and less than or equal to the second preset threshold, determining that the rock burst grade of the surrounding rock is slight rock burst. Preferably, the second preset threshold is 200kJ/m 3 。
And step three, if the rock burst energy is greater than the second preset threshold and less than or equal to the third preset threshold, determining that the rock burst grade of the surrounding rock is medium rock burst. Preferably, the third preset threshold is 400kJ/m 3 。
And step four, if the rock burst energy is greater than a third preset threshold and is less than or equal to a fourth preset threshold, determining that the rock burst grade of the surrounding rock is strong rock burst. Preferably, the fourth preset threshold is 600kJ/m 3 。
And 204, determining a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade.
In implementation, the computer device may pre-store a corresponding relationship between the rock burst level and the surrounding rock burst control design scheme, so as to determine the surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst level of the surrounding rock. The supporting method included in the design scheme of the surrounding rock burst control can comprise anchor grouting reinforcement, prestressed anchor rod and anchor cable support, anchor cable beam installation, W-shaped steel strip installation, antiknock flexible net installation, steel fiber concrete spraying, steel arch erection, restrained concrete arch erection and the like.
It should be noted that, in the case of developing an indoor compression test, the computer device may also obtain the tensile strength and compressive strength of the rock mass of the surrounding rock, and determine the moire-coulomb rock mass strength envelope of the surrounding rock according to the tensile strength and compressive strength of the rock mass. After the surrounding rock of the roadway is supported by adopting the surrounding rock burst control design scheme corresponding to the rock burst grade on the construction site, the Mohr-coulomb rock mass strength envelope curve of the surrounding rock can move outwards, the stress path evolution process of the rock mass is changed, and the rock burst occurrence risk is reduced.
Further, fig. 4 is a schematic diagram of an evolution process of a rock burst stress path before and after a surrounding rock support provided by an embodiment of the present application, and as shown in fig. 4, coordinates of each point on a moire-coulomb rock mass intensity envelope can reflect a corresponding tangential stress when the surrounding rock reaches a limit state (i.e., a rock mass failure) based on a moire intensity theory
And radial stress>
When the stress state of the rock mass corresponding to the surrounding rock is above the Mohr-Coulomb strength envelope curve, the stress state of the rock mass exceeds the limit state, so that rock burst is easy to occur, otherwise, the stress state of the rock mass is relatively stable, and rock burst is not easy to occur. As shown in fig. 4, the rock mass tensile strength based on surrounding rock->
And the compression strength of the rock mass->
The strength envelope curve of the Moire-Coulomb rock mass before the surrounding rock supporting can be determined. Due to the tensile strength of the rock mass after the surrounding rock support>
And a compressive strength->
Compared with the prior art, the strength envelope curve of the mohr-coulomb rock mass is increased before supporting, so that the strength envelope curve of the mohr-coulomb rock mass after supporting has the phenomenon of outward shift, and meanwhile, the rock burst peak stress after surrounding rock supporting is greater than or equal to the standard value>
And is also enlarged compared with the area before supporting. For the convenience of understanding, the rock burst stress path evolution process of the original rock stress point shown as the point a before and after the support is respectively shown in fig. 4. As shown in fig. 4, if no support is performed after excavation unloading, radial stress ÷ based on the rock burst stress path evolution process before point a support appears>
Lowered to 0 when subjected to a stress concentration or shock disturbance that causes tangential stress->
Increased to the rock burst peak stress->
In time, the surrounding rock is rockburst; if the support is carried out after the excavation unloading, the radial stress is greater or smaller than the standard value according to the rock burst stress path evolution process after the support of the point A>
Because the prestressed anchorage effect exerted by the prestressed anchor rod or anchor rope in the surrounding rock supporting scheme still has a certain initial value (equal to the prestressed force value exerted on the prestressed anchor rod or anchor rope), when the stress is concentrated or the impact disturbance makes the tangential stress->
Increased to rockburst peak stress>
In time, the surrounding rock is rockburst. According to the evolution process of rock burst stress paths before and after the surrounding rock supporting, the probability of rock burst of the surrounding rock can be reduced by supporting the surrounding rock. This application confirms corresponding country rock rockburst control design scheme according to the rockburst level, can be to the rock mass intensity of the pertinence improvement country rock of the different country rock condition for the probability that the country rock after strutting takes place the rockburst satisfies job site's security requirement, effectively guarantees construction safety.
As an optional implementation manner, the present application provides a surrounding rock burst control design scheme for surrounding rocks with a rock burst level of light rock burst, medium rock burst, and strong rock burst, respectively, and a processing process of determining, by a computer device, the surrounding rock burst control design scheme corresponding to the surrounding rocks according to the rock burst level is as follows:
if the rock burst grade is slight rock burst, determining that the corresponding surrounding rock burst control design scheme of the surrounding rock is as follows: after the surrounding rock excavation is finished, spraying concrete; installing an anti-explosion flexible net; and installing energy-absorbing anchor rods and anchor cables and quickly applying high prestress.
In implementation, for a slight rock burst area, the computer device determines a surrounding rock burst control design scheme corresponding to the surrounding rock as follows: after the surrounding rock excavation is finished, immediately spraying concrete to reinforce the surrounding rock; secondly, installing an anti-explosion flexible net on the surface of the surrounding rock; and step three, installing an energy-absorbing anchor rod and an anchor cable, and quickly applying high prestress to the anchor rod and the anchor cable.
If the rock burst grade is medium rock burst, determining that the surrounding rock burst control design scheme corresponding to the surrounding rock is as follows: after the surrounding rock excavation is finished, performing anchor grouting reinforcement; spraying concrete, and installing an anti-explosion flexible net; mounting anchor cable beams and steel belts, and erecting a steel arch frame; and installing an energy-absorbing anchor rod and an anchor cable, and quickly applying high prestress.
In implementation, for a medium rockburst area, the computer device determines a surrounding rock rockburst control design scheme corresponding to the surrounding rock as follows: after surrounding rock excavation is finished, performing anchor grouting reinforcement on the surrounding rock; step two, spraying concrete on the surface of the surrounding rock, and then installing an anti-explosion flexible net; thirdly, mounting anchor cable beams and steel belts, and erecting a steel arch frame; and step four, installing an energy-absorbing anchor rod and an anchor cable, and quickly applying high prestress to the anchor rod and the anchor cable. Preferably, the concrete is steel fiber concrete, the steel belt is a W-shaped steel belt, and the steel arch is an NPR steel arch.
If the rock burst grade is strong rock burst, determining that the design scheme of the surrounding rock burst control corresponding to the surrounding rock is as follows: after the surrounding rock excavation is finished, performing anchor grouting reinforcement; spraying concrete, and installing an anti-explosion flexible net; installing anchor cable beams and steel belts, and erecting a confined concrete arch truss; and installing energy-absorbing anchor rods and anchor cables with high anchoring and supporting density and quickly applying high prestress.
In implementation, aiming at an intense rockburst area, the computer equipment determines a surrounding rock rockburst control design scheme corresponding to the surrounding rock as follows: after surrounding rock excavation is finished, performing anchor grouting reinforcement on the surrounding rock; secondly, spraying concrete on the surface of the surrounding rock, and then installing an anti-explosion flexible net; thirdly, mounting anchor cable beams and steel belts, and erecting a confined concrete arch truss; and step four, installing energy-absorbing anchor rods and anchor cables with high anchoring and supporting density, and quickly applying high prestress to the anchor rods and the anchor cables. Preferably, the concrete is steel fiber concrete, the steel belt is a W-shaped steel belt, and the confined concrete arch is an NPR steel confined concrete arch.
It should be noted that, the anti-explosion flexible net adopted in the design scheme of the surrounding rock burst control aiming at slight rock burst, medium rock burst and strong rock burst in the application has the advantages of large deformation degree and strong anti-explosion effect compared with the existing commonly-used reinforcing mesh, and can provide better safety protection effect. In addition, the adopted anchor rods and anchor cables are all made of ideal elastic-plastic materials as supporting materials, have the characteristics of high prestress, high constant resistance, high energy absorption and high elongation rate, and can provide active supporting for surrounding rocks in time. In addition, anchor rod support, anchor cable support or anchor rod-anchor cable coupling support may be selectively applied according to site construction conditions.
As an alternative embodiment, the anchor grouting reinforcement process is as follows:
firstly, utilizing an anchor rod drilling machine to construct a drill hole, and withdrawing a drill rod after drilling to a designed depth; step two, injecting water into the drill hole at high pressure, and cleaning rock slag in the drill hole; and step three, feeding the hollow grouting anchor rod or the anchor cable into the drill hole, and injecting a grouting material into the cracks of the surrounding rock through high pressure so as to improve the strength of the surrounding rock.
The embodiment of the application provides a deep underground engineering rockburst prevention and control method. And then, the computer equipment determines the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain, and determines the rock burst grade of the surrounding rock according to the rock burst energy. And finally, the computer equipment determines a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade so as to prevent and control the rock burst. The method and the device can determine the rock burst energy of the surrounding rock and establish the relation between the rock burst energy and the surrounding rock support design, so that the surrounding rock burst control design scheme is determined in a targeted manner, the risk of rock burst is reduced, and the rock burst prevention and control effect is improved.
It should be understood that, although the steps in the flowcharts of fig. 1 to 2 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least some of the steps in fig. 1-2 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps or stages.
It is understood that the same/similar parts among the various embodiments of the method described above in this specification can be referred to each other, and each embodiment focuses on the differences from the other embodiments, and where relevant, reference may be made to the description of the other method embodiments.
The embodiment of the application also provides a deep underground works rock burst prevention and cure system, as shown in fig. 5, this system includes:
the deep rock burst test device 510 is used for performing a deep rock burst test on surrounding rocks;
the rock mechanical property testing device 520 is used for carrying out rock mechanical property testing on surrounding rocks;
the main control device 530 is used for acquiring rock burst peak stress of surrounding rocks in a deep rock burst test, stress-strain data and peak strain in a rock mechanical property test;
the main control device 530 is further configured to determine rock burst energy of the surrounding rock according to the rock burst peak stress, the stress-strain data, and the peak strain;
the main control device 530 is further configured to determine the rock burst level of the surrounding rock according to the rock burst energy;
and the main control device 530 is further configured to determine a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst level.
As an optional implementation manner, the master control device is specifically configured to:
determining energy corresponding to rock mass rock burst peak stress of surrounding rocks according to the rock burst peak stress and the peak strain;
determining energy required by rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain;
and determining the difference between the energy corresponding to the rock burst peak stress of the rock mass and the energy required by rock mass destruction as the rock burst energy of the surrounding rock.
As an optional implementation manner, the master control device is specifically configured to:
if the rock burst energy is less than or equal to a first preset threshold value, determining that the rock burst grade of the surrounding rock is rock burst-free;
if the rock burst energy is larger than a first preset threshold and smaller than or equal to a second preset threshold, determining that the rock burst grade of the surrounding rock is slight rock burst;
if the rock burst energy is larger than a second preset threshold and is smaller than or equal to a third preset threshold, determining that the rock burst grade of the surrounding rock is medium rock burst;
and if the rock burst energy is greater than a third preset threshold and less than or equal to a fourth preset threshold, determining that the rock burst grade of the surrounding rock is strong rock burst.
As an optional implementation manner, the master control device is specifically configured to:
if the rock burst grade is slight rock burst, determining that the corresponding surrounding rock burst control design scheme of the surrounding rock is as follows:
after the surrounding rock excavation is finished, spraying concrete;
installing an anti-explosion flexible net;
and installing energy-absorbing anchor rods and anchor cables and quickly applying high prestress.
As an optional implementation manner, the main control device is specifically configured to:
if the rock burst grade is medium rock burst, determining that the design scheme of the surrounding rock burst control corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a steel arch frame;
and installing energy-absorbing anchor rods and anchor cables and quickly applying high prestress.
As an optional implementation manner, the main control device is specifically configured to:
if the rock burst grade is strong rock burst, determining that the design scheme of the surrounding rock burst control corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a confined concrete arch frame;
and installing energy-absorbing anchor rods and anchor cables with high anchoring and supporting density and quickly applying high prestress.
As an alternative embodiment, the support material of the energy-absorbing anchor rods and the anchor cables is an ideal elastic-plastic material, and has the characteristics of high prestress, high constant resistance, high energy absorption and high elongation.
The embodiment of the application provides a deep underground engineering rockburst prevention and treatment system, and firstly, under the condition that a deep rock rockburst test is carried out, computer equipment obtains the rockburst peak stress of surrounding rocks, and under the condition that a rock mechanical property test is carried out, computer equipment obtains the stress-strain data and the peak strain of the surrounding rocks. And then, the computer equipment determines the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain, and determines the rock burst grade of the surrounding rock according to the rock burst energy. And finally, the computer equipment determines a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade so as to prevent and control the rock burst. The method and the device can determine the rock burst energy of the surrounding rock and establish the relation between the rock burst energy and the surrounding rock support design, so that the surrounding rock burst control design scheme is determined in a targeted manner, the risk of rock burst is reduced, and the rock burst prevention and control effect is improved.
For specific limitations of the deep underground engineering rockburst prevention and control system, reference may be made to the above limitations of the deep underground engineering rockburst prevention and control method, and details are not described here. All or part of each module in the deep underground engineering rock burst prevention and control system can be realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, as shown in fig. 6, and includes a memory and a processor, where the memory stores a computer program that can be executed on the processor, and the processor executes the computer program to implement the method steps for deep underground engineering rockburst prevention.
In one embodiment, a computer-readable storage medium has stored thereon a computer program which, when executed by a processor, carries out the steps of the above-described method of deep underground construction rockburst prevention.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct Rambus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
It should be further noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for presentation, analyzed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, as for the system embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (7)
1. A deep underground engineering rockburst prevention method is characterized by comprising the following steps:
carrying out a deep rock burst test to obtain the rock burst peak stress of the surrounding rock, carrying out a rock mechanical property test to obtain the stress-strain data and the peak strain of the surrounding rock;
determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain;
determining the rock burst grade of the surrounding rock according to the rock burst energy;
determining a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade;
determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain, and the method comprises the following steps: determining energy corresponding to the rock burst peak stress of the surrounding rock according to the rock burst peak stress and the peak strain; determining energy required by rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain; determining the difference value of the energy corresponding to the rock burst peak stress of the rock mass and the energy required by the rock mass to be destroyed as the rock burst energy of the surrounding rock; the energy required by rock mass destruction is the energy required by uniaxial compression destruction of the rock mass;
and determining the energy corresponding to the rock mass rock burst peak stress of the surrounding rock according to the rock burst peak stress and the peak strain by the following formula:
wherein the content of the first and second substances,E(σ 1c ) Representing the energy corresponding to the rock burst peak stress of the rock mass,σ 1c the peak stress of the rock burst is shown,ε c represents the peak strain;
and determining the formula of the energy required by the rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain, wherein the formula comprises the following steps:
wherein the content of the first and second substances,E(σ c ) The energy required for the destruction of the rock mass is represented,ε c the peak strain is shown to be,σthe stress is represented by the number of lines,εrepresenting strain.
2. The method of claim 1, wherein determining the rockburst rank of the surrounding rock from the rockburst energy comprises:
if the rock burst energy is smaller than or equal to a first preset threshold value, determining that the rock burst grade of the surrounding rock is rock burst-free;
if the rock burst energy is larger than a first preset threshold and smaller than or equal to a second preset threshold, determining that the rock burst grade of the surrounding rock is slight rock burst;
if the rock burst energy is larger than a second preset threshold and smaller than or equal to a third preset threshold, determining that the rock burst grade of the surrounding rock is medium rock burst;
and if the rock burst energy is greater than a third preset threshold and less than or equal to a fourth preset threshold, determining that the rock burst grade of the surrounding rock is strong rock burst.
3. The method according to claim 1, wherein the determining of the surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst level comprises:
if the rock burst grade is slight rock burst, determining that the design scheme of the surrounding rock burst control corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, spraying concrete;
installing an antiknock flexible net;
and installing an energy-absorbing anchor rod and an anchor cable, and quickly applying high prestress.
4. The method according to claim 1, wherein the determining of the surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst level comprises:
if the rock burst grade is medium rock burst, determining that the surrounding rock burst control design scheme corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
mounting anchor cable beams and steel belts, and erecting a steel arch frame;
and installing energy-absorbing anchor rods and anchor cables and quickly applying high prestress.
5. The method according to claim 1, wherein the determining of the surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst level comprises:
if the rock burst grade is strong rock burst, determining that the surrounding rock burst control design scheme corresponding to the surrounding rock is as follows:
after the surrounding rock excavation is finished, performing anchor grouting reinforcement;
spraying concrete, and installing an anti-explosion flexible net;
installing anchor cable beams and steel belts, and erecting a confined concrete arch truss;
and installing energy-absorbing anchor rods and anchor cables with high anchoring and supporting density and quickly applying high prestress.
6. The method according to any one of claims 3 to 5, wherein the support material of the energy absorbing anchor rods and cables is a perfect elastoplastic material having the characteristics of high prestress, high constant resistance, high energy absorption and high elongation.
7. A deep underground works rockburst prevention system, characterized in that the system includes:
the deep rock burst test device is used for carrying out a deep rock burst test on surrounding rocks;
the rock mechanical property testing device is used for carrying out rock mechanical property testing on the surrounding rock;
the main control device is used for acquiring rock burst peak stress of the surrounding rock in the deep rock burst test, and stress strain data and peak strain in the rock mechanical property test;
the main control device is further used for determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress strain data and the peak strain;
determining the rock burst energy of the surrounding rock according to the rock burst peak stress, the stress-strain data and the peak strain, and the method comprises the following steps: determining energy corresponding to the rock burst peak stress of the surrounding rock according to the rock burst peak stress and the peak strain; determining energy required by rock mass destruction of the surrounding rock according to the stress-strain data and the peak strain; determining the difference value of the energy corresponding to the rock burst peak stress of the rock mass and the energy required by the rock mass to be destroyed as the rock burst energy of the surrounding rock; the energy required by rock mass destruction is the energy required by uniaxial compression destruction of the rock mass;
the main control device is also used for determining the rock burst grade of the surrounding rock according to the rock burst energy;
and the main control device is also used for determining a surrounding rock burst control design scheme corresponding to the surrounding rock according to the rock burst grade.
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| CN102749660B (en) * | 2012-06-26 | 2015-01-07 | 中国人民解放军第二炮兵工程设计研究所 | Method for comprehensively forecasting approximately horizontal stratum rock burst in high geostress regions |
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