CN114486231A - Method and system for evaluating long-term dynamics performance of underground engineering support system - Google Patents
Method and system for evaluating long-term dynamics performance of underground engineering support system Download PDFInfo
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Abstract
The application relates to a method and a system for evaluating long-term dynamics performance of an underground engineering support system. The method comprises the following steps: the method comprises the steps that durability test is conducted on an underground engineering supporting member, mechanical property parameters of the supporting member corresponding to the durability test duration are obtained, and the mechanical property parameters are used for constructing a long-term dynamic property prediction model of the supporting member; predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member; and (3) comprehensively predicting the result, resisting the elastic strain energy released by the surrounding rock, evaluating the long-term dynamic performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation result. By adopting the method and the device, the long-term dynamic performance of the underground engineering supporting system can be effectively evaluated.
Description
Technical Field
The application relates to the technical field of underground engineering safety, in particular to a method and a system for evaluating long-term dynamics performance of an underground engineering support system.
Background
Coal mining develops year by year towards the deep part with the trend of the exhaustion of shallow coal resources. In the deep tunnel engineering construction process, the surrounding rock body is easy to loosen, break and the like under the action of excavation or mining disturbance, and the safety of coal mining is greatly influenced. By anchoring and supporting the surrounding rock of the deep roadway, the stress state of the surrounding rock is changed, the supporting member and the surrounding rock act together, and the aim of maintaining the safety and stability of the roadway can be achieved.
The supporting member is easy to be corroded by underground water, is corroded by stress and the like in the process of anchoring and supporting the surrounding rock of the roadway for a long time, and has continuously reduced dynamic performance. Under the action of deep high ground stress, tunnel surrounding rocks accumulate a large amount of elastic strain energy, are influenced by dynamic disturbance such as coal mine blasting excavation and working face mining, are prone to dynamic disasters such as rock burst and rock burst, and cause breakage failure of a supporting member. Therefore, long-term mechanical property evaluation of underground engineering support systems is required.
Disclosure of Invention
The method and the system are used for solving the technical problem that the prior art is relatively deficient in the research theory and practice of the long-term dynamic performance of the underground supporting member.
In a first aspect, an embodiment of the present application provides a method for evaluating long-term dynamics performance of an underground engineering support system, including: the method comprises the steps that durability test is conducted on an underground engineering supporting member, mechanical property parameters of the supporting member corresponding to the durability test duration are obtained, and the mechanical property parameters are used for constructing a long-term dynamic property prediction model of the supporting member; predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member; and (3) comprehensively predicting the result, resisting the elastic strain energy released by the surrounding rock, evaluating the long-term dynamic performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation result.
As an alternative embodiment, the passing durability test for the underground engineering supporting member comprises: penetrating the supporting member through a preset surrounding structure so as to apply circumferential confining pressure on the supporting member by using the surrounding structure; applying a pre-tightening force along the axial direction of the supporting member; and corroding the support member at preset time intervals by using a preset corrosion solution.
As an optional implementation manner, static performance parameters and dynamic performance parameters corresponding to each durability test duration before and after the durability test of the supporting member per unit length are obtained to construct the long-term dynamic performance prediction model of the supporting member.
As an optional implementation manner, the static performance parameter and the dynamic performance parameter corresponding to each durability test duration before and after the durability test of the supporting member per unit length are obtained, and are specifically used to determine a static performance damage rate, where a formula for determining the static performance damage rate is as follows: s = (f)0-ft）/f0(ii) a Wherein S is the static property damage rate, f0As initial hydrostatic property parameter, ftAnd (4) static performance parameters corresponding to the duration of each durability test.
As an alternative embodiment, the support member before and after the durability test is subjected to the dynamic impact tensile test by the hopkinson dynamic impact tensile test system, and the impact resistance of the support member per unit length before and after the durability test is determined, so as to obtain the dynamic performance parameters of the support member corresponding to the durability test duration.
As an alternative embodiment, the formula for determining the impact resistance per unit length of the supporting member before and after the endurance test is: e = amv22; wherein, when the supporting member is an underground engineering supporting member which is not subjected to the durability test, E is the impact resistance energy of the supporting member with the initial unit length; when the support member is an underground engineering support member after the durability test, E is the impact resistance energy of the support member per unit length corresponding to the durability test duration, and m is the impact warheadThe mass of (c); v is the launch velocity of the impacting warhead; a is an upper limit of the number of times the supporting member is impacted per unit length.
As an optional embodiment, the static performance damage rate, the initial unit length supporting member impact resistance energy and the unit length supporting member impact resistance energy corresponding to each durability test duration are subjected to fitting processing, and a long-term dynamic performance prediction model of the supporting member is constructed.
As an optional implementation mode, the comprehensive prediction result, the elastic strain energy resisting the release of the surrounding rock, the safety factor, and the number and the length of the supporting members are used for evaluating the long-term dynamic performance of the underground engineering supporting system, and the formula for determining whether the supporting system meets the safe use requirement of the underground engineering is as follows: when W is less than kNEL, the support system meets the safe use requirement of underground engineering; otherwise, the support system does not meet the safe use requirement of underground engineering; wherein N is the number of the supporting members, k is a safety factor, W is elastic strain energy resisting release of surrounding rock, E is a result of prediction of long-term dynamics characteristics of the supporting members, and L is the length of the number of the supporting members.
In a second aspect, an embodiment of the present application provides an underground engineering support system long-term mechanical property evaluation system, including: the system comprises an acquisition module, a prediction module and a prediction module, wherein the acquisition module is used for acquiring the dynamic performance parameters of the support member corresponding to the durability test duration by carrying out durability test and mechanical test on the underground engineering support member, and is used for constructing a long-term dynamic performance prediction model of the support member; the prediction module is used for predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member; and the evaluation module is used for comprehensively predicting results, resisting elastic strain energy released by surrounding rocks, evaluating the long-term dynamic performance of the underground engineering supporting system by using the safety coefficient and the number and the length of the supporting members, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation results.
The application provides long-term dynamics performance evaluation and system of an underground engineering support system, and the technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the method comprises the steps that durability test is conducted on an underground engineering supporting member, mechanical property parameters of the supporting member corresponding to the durability test duration are obtained, and the mechanical property parameters are used for constructing a long-term dynamic property prediction model of the supporting member; predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member; and (3) comprehensively predicting the result, resisting the elastic strain energy released by the surrounding rock, evaluating the long-term dynamic performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation result. By adopting the technical scheme provided by the embodiment of the application, the long-term dynamic performance of the underground engineering supporting system can be effectively evaluated, and the safety and the stability of the underground engineering are ensured.
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 flowchart of a method for evaluating long-term dynamics performance of an underground engineering supporting system according to an embodiment of the present application;
fig. 2 is a flowchart of a durability test performed on an underground engineering supporting member in a method for evaluating long-term dynamics performance of an underground engineering supporting system according to an embodiment of the present application;
FIG. 3 is a logic diagram of a method for evaluating long-term dynamics performance of an underground engineering support system according to an embodiment of the present application;
fig. 4 is a schematic frame structure diagram of an underground engineering support system dynamic long-term mechanical property evaluation system provided in an embodiment of the present application.
Reference numerals and corresponding description:
401: an acquisition module;
402: a prediction module;
403: and an evaluation module.
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 the present application and are not intended to limit the present application.
The terms referred to in this application will first be introduced and explained:
NPR is short for Negative Poisson's Ratio, meaning Negative Poisson's Ratio. The NPR (Negative Poisson's Ratio) material is obtained based on the research and development of a steel material micro-crystal coherent structure, and a constant-impedance impact anchor rod (cable), namely an underground supporting member, can be developed by utilizing the NPR material, so that the underground supporting member has the characteristics of high strength, high elongation and high energy absorption. Compared with common materials, the NPR material load-deformation curve is divided into an elastic stage and a plastic stage, is close to ideal elastic-plastic property, and can improve the utilization rate of material yield load while ensuring safe storage.
The application provides a method and a system for evaluating long-term dynamics performance of an underground engineering support system, and aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
The embodiment of the application provides a long-term dynamics performance evaluation method for an underground engineering support system. As shown in fig. 1, a flowchart in the method for evaluating long-term dynamics performance of an underground engineering support system provided in the embodiment of the present application mainly includes steps S101 to S103:
step S101: the method comprises the steps of carrying out durability test on an underground engineering supporting member, obtaining mechanical property parameters of the supporting member corresponding to the durability test duration, and using the mechanical property parameters to construct a long-term dynamic property prediction model of the supporting member.
Step S102: and predicting the long-term dynamic characteristics of the supporting member according to the long-term dynamic performance prediction model and the design service life of the supporting member.
Step S103: and (3) comprehensively predicting the result, resisting the elastic strain energy released by the surrounding rock, evaluating the long-term dynamic performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation result.
By adopting the method for evaluating the long-term dynamics performance of the underground engineering support system in the embodiment of the application, the long-term dynamics performance of the underground engineering support system can be effectively evaluated, and the safety and the stability of underground engineering are ensured.
As an alternative embodiment, as shown in fig. 2, the method for testing the durability of the underground engineering supporting member in the foregoing step S101 mainly includes steps S201 to S203:
step S201: and penetrating the supporting member through a preset surrounding structure so as to apply circumferential confining pressure on the supporting member by using the surrounding structure.
Step S202: applying a pretightening force along the axial direction of the supporting member;
step S203: and corroding the support member at preset time intervals by using a preset corrosion solution.
The erosion of the supporting member mainly takes the erosion concentration, the erosion temperature, the erosion duration and the erosion flow rate into consideration. Due to the fact that under the conditions of different erosion concentrations, erosion temperatures, erosion duration and erosion flow rates, the influence of erosion on the supporting member is different greatly. Therefore, different erosion concentrations, erosion temperatures, erosion time lengths and erosion flow rates are set respectively for erosion tests. For example, an acidic etching solution, a basic etching solution, an etching duration, a flow rate of the etching solution and an etching temperature are respectively arranged in equal gradient to perform etching. In order to improve the accuracy of the test, the number of each group of supporting members is not less than 3.
In some possible embodiments, in the process of erosion, the supporting member in the erosion test is taken out at preset time intervals, the surface of the supporting member is ground and derusted, and surface residues are washed by distilled water to ensure that the surface of the supporting member is clean. Alternatively, the preset time interval may be one month.
The performance parameters of the supporting member comprise static performance parameters and dynamic performance parameters. The static properties include yield strength, failure strength and elongation. Optionally, the static property is one of yield strength, failure strength, and elongation. The dynamic performance parameter may be resistance to impact energy.
As an optional embodiment, static performance parameters and dynamic performance parameters corresponding to each durability test duration before and after the durability test of the supporting member with the unit length are obtained to construct a long-term dynamic performance prediction model of the supporting member.
Optionally, the pre-tightening force applied in the step S202 may be 70% of the initial static performance parameter; the initial static performance parameter is the static performance parameter before the durability test of the supporting member (when the durability test is not carried out and is 0).
As an optional implementation manner, before and after the durability test of the supporting member with the unit length, the static performance parameters and the dynamic performance parameters corresponding to each durability test duration are obtained, and are specifically used for determining the static performance damage rate, and the formula for determining the static performance damage rate is as follows:
S=（f0-ft）/f0；
wherein S is the static property damage rate, f0As initial hydrostatic property parameter, ftAnd (4) static performance parameters corresponding to the duration of each durability test.
As an alternative embodiment, the step S101 of testing the durability of the underground engineering supporting member mainly includes:
and respectively carrying out power impact tensile test on the supporting member before and after the durability test through a Hopkinson power impact tensile test system, and determining the impact resistance of the supporting member in unit length before and after the durability test so as to obtain the dynamic performance parameters of the supporting member corresponding to the durability test duration.
The Hopkinson impact system comprises an impact warhead, a bearing sleeve and a fixed support. The supporting component penetrates through the bearing sleeve, two ends of the supporting component are fixed through the bearing sleeve and the fixed support, the impact warhead impacts and stretches the supporting component by means of the impact bearing sleeve until the supporting component is disconnected, and the current impact frequency is recorded.
As an alternative embodiment, the formula for determining the impact resistance per unit length of the supporting member before and after the endurance test is:
E=amv2/2；
wherein, when the supporting member is an underground engineering supporting member which is not subjected to the durability test, E is the impact resistance energy of the supporting member with the initial unit length; when the supporting member is an underground engineering supporting member after the durability test, E is the impact resistance energy of the supporting member in unit length corresponding to the durability test duration, and m is the mass of the impact warhead; v is the launch velocity of the impacting warhead; a is an upper limit of the number of times the supporting member is impacted per unit length. Wherein, the impact resistance of the support member with the initial unit length is the impact resistance before the durability test of the support member (when the durability test is not carried out and is 0); the upper limit of the number of times the unit length supporting member is impacted is the number of times before being impacted and broken, for example, when the unit length supporting member is broken after being impacted for the 30 th time, the upper limit of the number of times the unit length supporting member is impacted is 29 times.
Next, the construction of the support member long-term dynamics performance prediction model will be specifically described.
The specific method for constructing the support member long-term dynamics performance prediction model is as follows:
as an alternative embodiment, the dynamic performance parameter includes the impact resistance of the initial unit-length supporting member and the impact resistance of the unit-length supporting member corresponding to each durability test duration; the specific method for constructing the long-term dynamic performance prediction model of the support member mainly comprises the following steps:
and fitting the static performance damage rate, the initial unit length supporting member impact resistance energy and the unit length supporting member impact resistance energy corresponding to each durability test duration to construct a supporting member long-term dynamic performance prediction model.
The examples of the present application illustrate the static properties as the breaking strength.
The method for acquiring the failure strength parameter comprises the following steps: when the initial failure strength parameter is obtained, obtaining a preset number of supporting members in unit length which are not subjected to the durability test; when the limited strength parameter corresponding to each durability test duration is obtained, obtaining a preset number of support members in unit length after the durability test, wherein the support members correspond to the durability test durations; and (3) polishing the surface of the supporting member to be detected by using sand paper to remove surface impurities, and performing static tension on the supporting member to be detected by using a servo hydraulic stretcher to obtain corresponding failure strength parameters.
As an optional embodiment, the fitting process is performed on the static performance damage rate, the initial impact resistance of the supporting member per unit length and the impact resistance of the supporting member per unit length corresponding to each durability test duration, and the constructing of the long-term dynamic performance prediction model of the supporting member includes:
establishing a prediction model of the static performance damage rate of the support member changing along with time through a grey system theory GM (1, 1) model, and then adopting a fit type function in matlab mathematical analysis software to carry out nonlinear fitting on the unit length impact resistance and the static performance damage rate to construct a unit length impact resistance prediction model.
As an alternative embodiment, the long-term dynamic performance of the underground engineering supporting system is evaluated by integrating the prediction results, the elastic strain energy for resisting the release of the surrounding rock, the safety factor, and the number and the length of the supporting members in the step S103, and the formula for determining whether the supporting system meets the safe use requirement of the underground engineering is as follows:
when W is less than kNEL, the support system meets the safe use requirement of underground engineering; otherwise, the supporting system does not meet the safe use requirement of underground engineering.
Wherein N is the number of the supporting members, k is a safety factor, W is elastic strain energy resisting release of surrounding rock, E is a result of prediction of long-term dynamics characteristics of the supporting members, and L is the length of the number of the supporting members.
Alternatively, the design service life in the foregoing step S102 and the number of bracing members in the foregoing step S103 may be determined by:
the engineering analogy method comprises the steps of performing engineering analogy by connecting the design under specific rock mass conditions with the practical experience under the corresponding conditions of individual engineering according to the experience of similar engineering which is already supported, and determining different supporting forms and parameters according to rock strata of different types after correctly classifying surrounding rocks.
And secondly, designing support member parameters by adopting theoretical calculation methods such as a suspension effect theory, a pressure-bearing arch theory, a loose ring support theory and the like.
And thirdly, an actual measurement method, namely designing and planning the parameters of the supporting member by utilizing a method of actually measuring the loosening circle of the surrounding rock of the roadway by using an ultrasonic instrument according to actual field observation data.
Optionally, the method for determining the safety factor in step S103 includes: and determining the stability coefficient of the surrounding rock by combining the engineering geological conditions, wherein the worse the engineering geological conditions are, such as low strength of the surrounding rock, thin bedrock, weathering layer and other factors, the higher the corresponding stability coefficient of the surrounding rock is.
Optionally, the method for determining elastic strain energy against surrounding rock release in step S103 includes: the method comprises the steps of carrying out uniaxial compression experiment on a rock sample of a standard rock body to obtain a stress-strain overall process curve of the rock sample, carrying out integral summation on the left curve of peak intensity and the area surrounded by an abscissa axis, and solving the limit strain energy which can be stored by the standard rock sample. And carrying out numerical simulation on the underground engineering through FLAC 3D modeling software, obtaining the range of the surrounding rock mass breaking-loosening ring within the unit moving length range of the roadway, and determining the elastic strain energy released by the surrounding rock by taking the limit strain energy which can be stored in a standard rock sample as a reference.
As an alternative embodiment, the material of the underground bracing member comprises NPR material. By adopting the NPR material, the purposes of effectively resisting the elastic strain energy of the surrounding rock and controlling the large deformation of the surrounding rock can be achieved, and the stability of the rock mass of the underground engineering surrounding rock is ensured.
The logic schematic diagram of the method for evaluating the long-term dynamics performance of the underground engineering support system provided by the embodiment of the application is shown in fig. 3, and reference may be made to the above definition of the method for evaluating the long-term dynamics performance of the underground engineering support system, which is not described herein again.
It should be understood that, although the steps in the flowcharts of fig. 1 to 3 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 performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 to 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the other steps or stages.
Based on the same inventive concept, as shown in fig. 4, the embodiment of the present application provides an evaluation system for long-term dynamics of an underground engineering supporting system, which mainly includes an obtaining module 401, a prediction module 402 and an evaluation module 403. The obtaining module 401 is configured to obtain mechanical property parameters of the support member corresponding to the duration of the durability test by performing the durability test on the underground engineering support member, and is configured to construct a long-term dynamic property prediction model of the support member; the prediction module 402 is used for predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member; the evaluation module 403 is used for comprehensively predicting results, resisting elastic strain energy released by surrounding rocks, safety factors, and the number and length of supporting members, evaluating long-term dynamics performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirements of the underground engineering according to the evaluation results.
By adopting the long-term mechanical property evaluation system of the underground engineering support system in the embodiment of the application, the long-term dynamic property of the underground engineering support system can be effectively evaluated, and the safety and the stability of underground engineering are ensured.
For specific limitations of the system for evaluating long-term mechanical properties of an underground engineering support system, reference may be made to the above limitations of the method for evaluating long-term dynamic properties of an underground engineering support system, and details are not repeated here. Each module in the long-term mechanical property evaluation system of the underground engineering support system can be realized by software, hardware and a combination thereof. 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.
It is understood that the same/similar parts between the 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 it is sufficient that the relevant points are referred to the descriptions of the other method embodiments.
It should be noted that the term "comprises/comprising" or any other variation thereof in this document is 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.
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 the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification 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 shall be subject to the appended claims.
Claims (9)
1. A long-term dynamics performance evaluation method for an underground engineering support system is characterized by comprising the following steps:
the method comprises the steps that durability test is conducted on an underground engineering supporting member, mechanical property parameters of the supporting member corresponding to the durability test duration are obtained, and the mechanical property parameters are used for constructing a long-term dynamic property prediction model of the supporting member;
predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member;
and (3) comprehensively predicting the result, resisting the elastic strain energy released by the surrounding rock, evaluating the long-term dynamic performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation result, wherein the safety factor and the number and the length of supporting members are evaluated.
2. The method for evaluating the long-term dynamics performance of an underground engineering support system according to claim 1, wherein the passing of the durability test on the underground engineering support member comprises the following steps:
penetrating the supporting member through a preset surrounding structure so as to apply circumferential confining pressure on the supporting member by using the surrounding structure;
applying a pre-tightening force along the axial direction of the supporting member;
and corroding the support member at preset time intervals by using a preset corrosion solution.
3. The method for evaluating the long-term dynamics performance of an underground engineering support system according to claim 1,
static performance parameters and dynamic performance parameters corresponding to each durability test duration before and after the durability test of the supporting member in unit length are obtained, so as to construct a long-term dynamic performance prediction model of the supporting member.
4. The method for evaluating the long-term dynamics performance of an underground engineering supporting system according to claim 3, wherein the obtained statics performance parameters and dynamics performance parameters corresponding to each durability test duration before and after the durability test of the supporting member in unit length are specifically used for determining the statics performance damage rate, and the formula for determining the statics performance damage rate is as follows:
S=（f0-ft）/f0；
wherein S is the static property damage rate, f0As initial hydrostatic property parameter, ftAnd (4) static performance parameters corresponding to the duration of each durability test.
5. The method for evaluating the long-term dynamics performance of an underground engineering support system according to claim 3,
and respectively carrying out power impact tensile test on the supporting member before and after the durability test through a Hopkinson power impact tensile test system, and determining the impact resistance of the supporting member in unit length before and after the durability test so as to obtain the dynamic performance parameters of the supporting member corresponding to the durability test duration.
6. The method for evaluating the long-term dynamics performance of an underground engineering supporting system according to claim 5, wherein the formula for determining the impact resistance of the supporting member per unit length before and after the durability test is as follows:
E=amv2/2；
wherein, when the supporting member is an underground engineering supporting member which is not subjected to the durability test, E is the impact resistance energy of the supporting member with the initial unit length; when the supporting member is an underground engineering supporting member after the durability test, E is the impact resistance energy of the supporting member in unit length corresponding to the durability test duration, and m is the mass of the impact warhead; v is the launch velocity of the impacting warhead; a is an upper limit of the number of times the supporting member is impacted per unit length.
7. The method for evaluating the long-term dynamics performance of an underground engineering support system according to claim 1,
and fitting the static performance damage rate, the initial unit length supporting member impact resistance energy and the unit length supporting member impact resistance energy corresponding to each durability test duration to construct the supporting member long-term dynamic performance prediction model.
8. The method for evaluating the long-term dynamics performance of an underground engineering support system according to claim 1,
the comprehensive prediction result, the elastic strain energy resisting the release of the surrounding rock, the safety factor and the number and the length of the supporting members are used for evaluating the long-term dynamic performance of the underground engineering supporting system, and the formula for determining whether the supporting system meets the safe use requirement of the underground engineering according to the evaluation result is as follows:
when W is less than kNEL, the support system meets the safe use requirement of underground engineering; otherwise, the support system does not meet the safe use requirement of underground engineering;
wherein N is the number of the supporting members, k is a safety factor, W is elastic strain energy resisting release of surrounding rock, E is a result of prediction of long-term dynamics characteristics of the supporting members, and L is the length of the number of the supporting members.
9. The long-term dynamics performance evaluation system of the underground engineering supporting system is characterized by comprising the following components:
the system comprises an acquisition module, a storage module and a prediction module, wherein the acquisition module is used for acquiring mechanical property parameters of a support member corresponding to the durability test duration through durability test of the support member of the underground engineering, and is used for constructing a long-term dynamic property prediction model of the support member;
the prediction module is used for predicting the long-term dynamics characteristics of the supporting member according to the long-term dynamics performance prediction model and the design service life of the supporting member;
and the evaluation module is used for comprehensively predicting the result, resisting the elastic strain energy released by the surrounding rock, evaluating the long-term dynamic performance of the underground engineering supporting system, and determining whether the supporting system meets the safe use requirement of the underground engineering according to the safety factor, the number of supporting members and the length of the supporting members.
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| CN115308058A (en) * | 2022-10-11 | 2022-11-08 | 中国矿业大学(北京) | Underground engineering support system high strain rate dynamic test and evaluation system and method |
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