CN209745731U - device for researching mechanism of influence of blasting vibration on strength of mortar anchor rod - Google Patents
device for researching mechanism of influence of blasting vibration on strength of mortar anchor rod Download PDFInfo
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- CN209745731U CN209745731U CN201920024249.4U CN201920024249U CN209745731U CN 209745731 U CN209745731 U CN 209745731U CN 201920024249 U CN201920024249 U CN 201920024249U CN 209745731 U CN209745731 U CN 209745731U
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Abstract
The utility model discloses a device for studying the mechanism that blasting vibration influences mortar anchor rod strength, the device comprises a vibrating table, an experiment test block fixing groove is arranged on the vibrating table, a fastening device is arranged on the fixing groove, an experiment frame is placed on the table top of the vibrating table, a layer of sponge is arranged on the inner side wall of the experiment frame, two reaction frames which are vertically arranged are arranged on the vibrating table, the two reaction frames are arranged on two sides of the experiment frame and are in relatively parallel arrangement, a spring is fixedly arranged on each reaction frame, the spring is horizontally arranged, one end of each reaction frame is fixed on the corresponding reaction frame, the other end of each reaction frame is abutted against the outer side wall of the experiment frame, and the spring is in a compression state; the top of experiment frame is equipped with draws the appearance for draw and insert the stock of establishing in the experiment test block, wherein, the experiment test block is installed in the experiment frame when the test. Utilize the utility model discloses can study blasting vibration to the test of mortar stock intensity influence mechanism, support the design optimization for the tunnel and provide theoretical support.
Description
Technical Field
The utility model relates to a blasting engineering field especially relates to a device that is used for studying blasting to influence mechanism to tunnel mortar stock intensity.
Background
with the rapid development of infrastructure construction in China, roads and railways cross mountains and mountains in all directions. The drilling and blasting method is used as a common excavation means for tunnel construction, has the characteristics of high efficiency, strong maneuverability, wide usability and the like, meanwhile, harmful effects generated by blasting are frequently generated in engineering construction, one part of energy generated by blasting is used for crushing tunnel rock masses, the other part of energy is also transmitted to tunnel surrounding rocks and an inner tunnel supporting structure in a stress wave mode, so that the primary supporting structure is damaged to a certain extent, the subsequent supporting function and the service time of a tunnel are influenced, and a mortar anchor rod is used as a most common means for tunnel supporting, and the change of the structural performance after the blasting action needs to pay attention.
At present, most researches on the influence of the mortar anchor rod support strength in the tunnel are on the anchor rod anchoring action mechanism and the pull load transmission mechanism, the degradation mechanism of the mortar anchor rod support strength of the tunnel is lack of researches on the explosion action, and meanwhile, researches on the propagation rule of a stress wave passing through the mortar anchor rod are rare.
Based on the method, aiming at the research on the influence of blasting on the mortar anchor rod support of the tunnel, the anchor rods with different surrounding rock types, different mortar proportions and different diameters to be researched are selected, the research on the influence mechanism of the blasting action on the support strength of the mortar anchor rod is carried out, and the influence mechanism of the propagation rule of the stress wave passing through the mortar anchor rod and the blasting vibration on the degradation of the uplift resistance of the mortar anchor rod under the blasting action is disclosed. The research result has great significance for reducing the damage of the blasting stress wave to the mortar anchor rod support in the tunnel, and simultaneously has theoretical supporting effect on the optimization of the tunnel support design. But the prior art lacks a device for researching the mechanism of the influence of blasting vibration on the strength of the mortar anchor rod.
SUMMERY OF THE UTILITY MODEL
the to-be-aimed technical problem of the utility model is that, prior art lacks the technical defect who is used for studying the device that blasting vibration influences the mechanism to mortar anchor rod intensity, consequently provides a device and method that is used for studying blasting to influence the mechanism to tunnel mortar anchor rod intensity, and its aim at utilizes the utility model discloses the research achievement that records reduces the damage that blasting stress ripples is strutted to mortar anchor rod in the tunnel, provides theoretical support to tunnel support design optimization simultaneously.
according to the utility model discloses an wherein on the one hand, the utility model provides a technical scheme that its technical problem adopted is: the device comprises a vibrating table, wherein the vibrating table is provided with an experiment test block fixing groove, an experiment test block fastening device is arranged on the fixing groove, an experiment frame with an upper end and a lower end both open, which are formed by splicing two steel plates, is placed on a table top of the vibrating table, a layer of sponge is arranged on the inner side wall of the experiment frame, two reaction frames which are vertically arranged are also arranged on the vibrating table, the two reaction frames are positioned on two sides of the experiment frame and are arranged in parallel relatively, each reaction frame is fixedly provided with a spring, one end of each spring is horizontally arranged, one end of each spring is fixed on the corresponding reaction frame, the other end of each spring is abutted against the outer side wall of the experiment frame, the springs are in a compression state, and the two springs are respectively abutted against one; during testing, the drawing instrument is arranged above the experimental frame and used for drawing and inserting the anchor rod arranged in the experimental test block, wherein the experimental test block is arranged in the experimental frame during testing, the experimental test block is made of rock, the middle of the rock is hollowed and filled with shotcrete, the lower part of the anchor rod is buried in the shotcrete, and the buried depth is equal to the thickness of the shotcrete.
Further, the utility model discloses an in the device that is arranged in studying the blasting to tunnel mortar stock intensity influence mechanism, the reaction frame is planar steel sheet.
Further, the utility model discloses an in the device that is arranged in research blasting to tunnel mortar stock intensity influence mechanism, two steel sheets and two spring axisymmetrics set up.
further, the utility model discloses an among the device that is arranged in studying blasting to tunnel mortar stock intensity influence mechanism, draw the appearance and can remove in the horizontal plane to aim at the stock, and can remove in vertical direction, in order to draw the stock.
Further, the utility model discloses an among the device that is arranged in research blasting to tunnel mortar stock intensity influence mechanism, experiment test block portion of digging into a hollow portion runs through to experiment test block bottom surface from top to bottom.
With the prior art, the utility model has the advantages of it is following: utilize the utility model discloses can study blasting vibration to the test of mortar stock intensity influence mechanism, support the design optimization for the tunnel and provide theoretical support. The acoustic wave tester is used for classifying the manufactured test blocks, so that the consistency of the properties of the test blocks is ensured, errors caused by other factors are eliminated, the aim of controlling a single variable in an experiment is fulfilled to a greater extent, and the rule of resistance to plucking strength deterioration caused by the change of the dependent variable under the action of different burst loads is further accurately found. The pull-out test device is modified, so that the secondary disturbance to the test block caused by moving the test block after the test block is subjected to the blasting simulation load effect is avoided, and the accuracy of the test result is ensured. The test testing device comprises various monitoring and measuring means, and parameters of the test block before and after vibration are measured in various aspects by applying different blasting vibration loads to the test block, so that the influence rule of the blasting vibration loads with different characteristics on the strength degradation of the cementing surface and the propagation rule of the blasting stress wave before and after passing through the cementing surface are truly and accurately reflected. The relation between the limit withdrawal resistance and the displacement of the anchor rod can be obtained through tests, the anchor rod bonding sliding structure is obtained through strain monitoring inside the anchor rod, and a stress distribution rule when the anchor rod is stressed is found.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic structural diagram of an embodiment of a device for researching an influence mechanism of blasting on the strength of a tunnel mortar anchor rod;
FIG. 2 is a top view along AA' of FIG. 1;
Fig. 3 is a flow chart of a measuring method for studying the mechanism of influence of blasting on the strength of a tunnel mortar anchor rod.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 2, in a device for studying blasting to tunnel mortar stock intensity influence mechanism of this embodiment, it contains shaking table 2, be provided with experiment test block fixed slot (not shown in the figure) on shaking table 2, be provided with experiment test block fastener (not shown in the figure) on the fixed slot, placed two blocks of steel sheet amalgamations on the mesa of shaking table 2, the equal open-ended experimental frame 5 of lower extreme, the experimental frame is cylindric, experimental frame 5 sets up all around along the fixed slot, be equipped with one deck sponge 9 on the 5 inside walls of experimental frame, sponge 5 plays the effect of the no reflection boundary condition of simulation. The reaction frame 1 of two vertical settings in addition on the shaking table, two reaction frame 1 are located the both sides and the relative parallel arrangement of experiment frame 5, and fixed mounting has spring 6 on every reaction frame 1, and the 6 level of spring sets up, and one end is fixed on the reaction frame 1 that corresponds, and the separable butt of the other end (not fixed connection) is on the lateral wall of experiment frame, and the spring is in compression state, plays the initial stress state that the simulation test piece received. Preferably, the two steel plates and the two springs are arranged in an axisymmetric manner, and the axisymmetric arrangement comprises the properties and the installation positions of the steel plates and the springs; during the test, the top of experiment frame has draws appearance 8 for draw and insert stock 7 of establishing in the experiment test block, wherein, the experiment test block is installed when the test in experiment frame 5, draws appearance 8 and can remove in the horizontal plane to aim at stock 7, and can remove in vertical direction, in order to draw stock 7. Different vibration amplitude, duration and different frequency simulation reality blasting vibration's of will shaking table 2 output through experimental frame 3, reaction frame 1 and spring 5 load transmission to experimental test block, experimental test block is made for the rock, and the centre department of rock is hollowed and is filled for spray concrete 71, and the experimental test block portion of hollowing runs through to experimental test block bottom surface from top to bottom, and the lower part of stock is buried underground in spray concrete, and the buried depth equals the thickness of spray concrete.
In this embodiment, reaction frame 1 is planar steel sheet, and experiment test block fastener can set up to the fastening hoop, when needs fastening experiment test block, and the fastening hoop is locked, and when needing to dismantle the experiment test block, unclamp the experiment test block so that take out. The reaction frame is movable at a fixed position on the vibration table, and can be fixed through a fastener after being moved to a specified position; when the fastener needs to be moved again, the fastener can be loosened for movement. Wherein, the split of the experimental frame 5 is realized by the elastic force between the two springs.
referring to fig. 3, the utility model also provides a method for studying blasting influences the mechanism to tunnel mortar stock intensity, including following step:
S1, manufacturing test blocks, wherein the test blocks comprise different property surrounding rocks, mortar made of different proportioning materials and anchor rods with different diameters, and the test blocks specifically comprise the following components:
s1.1, manufacturing a cylindrical surrounding rock sample according to the design requirement of a mortar anchor rod, selecting anchor rods with different diameters, and drilling holes with different diameters on the cylindrical surrounding rock;
S1.2, selecting mortar with different material proportions according to the design requirements of the mortar anchor rod, manufacturing a test block, and maintaining according to the design time.
S2, after the test block is manufactured, the sound wave tester is used for conducting sound wave test on the test block before and after the test block is subjected to blasting vibration, the test block is analyzed according to the sound wave test result, and therefore the test block with the consistent sound wave test result is selected for conducting follow-up test. The method comprises the following steps:
S2.1, after test blocks are prepared, carrying out consistency screening on the test blocks, carrying out sound wave test on the test blocks by using a sound wave tester, wherein the sound wave test comprises radial and axial sound wave tests of a cylinder, and selecting the test blocks with consistent sound wave test results to carry out blasting vibration contrast tests;
s2.2, after the test block is disturbed by blasting vibration, performing sound wave test on the test block by using a sound wave tester, wherein the sound wave test comprises radial and axial sound wave tests of a cylinder and comparing sound wave test results before blasting vibration.
the acoustic wave tester sends out ultrasonic waves on an ultrasonic wave instrument oscillography screen, the abscissa represents the propagation time of the acoustic waves, and the ordinate represents the amplitude of echo signals. For the same homogeneous medium, the propagation time of the pulse wave is proportional to the acoustic path. Therefore, the existence of the defect can be judged according to the occurrence of the defect echo signal, and if the difference between the sound wave test result of part of test blocks and the sound wave test result of other test blocks is larger, the test blocks are removed.
S3, loading a part of test blocks on the device under the static boundary condition, and then performing a drawing resistance test to measure the drawing resistance of the mortar anchor rod under the static boundary condition;
S4, loading the other part of test blocks (preferably test blocks in the same batch as the test blocks in the step S3) on the device under different blasting vibration simulation load conditions, and measuring to obtain test data of the influence rule of the surrounding rock-mortar-anchor rod interface on the propagation of the blasting stress wave;
And S5, loading under different blasting vibration simulation load conditions (reloading can be carried out, and the loading in the step S4 can also be continuously utilized) on the device, then carrying out a drawing resistance test, and measuring the drawing resistance of the mortar anchor rod under the blasting vibration simulation load conditions, thereby obtaining test data of the influence of blasting vibration on the supporting strength of the mortar anchor rod.
And S6, obtaining the mathematical quantitative relation of the blasting vibration effect on the mortar anchor bolt support strength according to the results of S1-S5.
The method comprises the following steps of analyzing the stress state of surrounding rock-sprayed concrete in a tunnel, simplifying a test model, and calculating the initial state of a test block according to rock mechanics and tectonic mechanics theories to obtain the initial stress condition of the test block; and obtaining the compression length of the spring according to the initial stress condition of the test block. The initial stress state is calculated to determine the compression length of the spring, and after the experimental test block is fixed through the fastening device, the reaction frame is moved to a proper position and then fixed so as to meet the requirement of the compression length of the spring. After the length of the spring is fixed, the spring applies fixed pressure to the two semicircular steel plates, and loading under the static boundary condition is completed.
The loading under the condition of the blasting vibration simulation load refers to that the vibration table 2 is started to vibrate in the step of loading the static boundary condition, so that the blasting vibration environment is simulated. Different blasting vibration simulation loads are applied to the test block by loading loads with different vibration amplitudes, durations and frequencies.
Wherein, experimental test block country rock surface is last (be the foil gage of the anchor rod 7 left and right sides in fig. 1) and anchor rod 7 part pastes foil gage 4, and the arrangement of anchor rod part foil gage 4 includes: the anchor rod 7 is cut open along the longitudinal axis direction, a groove is milled, the strain gauge 4 is pasted into the groove, and the strain gauge 4 is axially arranged along the anchor rod 7. When the stress wave is tested, the change of the stress wave is measured by sticking the strain gauges 4 on the surface of the surrounding rock of the test block (namely, the strain gauges on the left side and the right side of the anchor rod 7 in the figure 1) and the part of the anchor rod 7, and the influence rule of the propagation of the blasting stress wave is obtained; when the anti-pulling experiment is carried out, different dynamic strains of the anchor rod 7 and the surrounding rock are obtained, and the anti-pulling force of the mortar anchor rod under the condition of blasting vibration simulation load is measured through the strain gauge 4 on the anchor rod 7.
And (3) carrying out an anti-pulling test on the test block, wherein the loading rate is 10-20 KN per minute, the anchor rod is axially pulled when a load is applied, and the distribution condition of the bonding stress of the anchor rod when the anchor rod is pulled and stressed is recorded along strain gauges arranged in the anchor rod.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (5)
1. a device for researching the influence mechanism of blasting vibration on the strength of a mortar anchor rod is characterized by comprising a vibrating table, wherein an experiment test block fixing groove is formed in the vibrating table, an experiment test block fastening device is arranged on the fixing groove, an experiment frame with an upper end and a lower end both open and formed by splicing two steel plates is placed on a table top of the vibrating table, the experiment frame is arranged along the periphery of the fixing groove, a layer of sponge is arranged on the inner side wall of the experiment frame, two vertically arranged reaction frames are arranged on the vibrating table, the two reaction frames are arranged on two sides of the experiment frame and are arranged in parallel relatively, a spring is fixedly arranged on each reaction frame, the springs are arranged horizontally, one end of each spring is fixed on the corresponding reaction frame, the other end of each spring is abutted to the outer side wall of the experiment frame, the springs are in a; during testing, the drawing instrument is arranged above the experimental frame and used for drawing and inserting the anchor rod arranged in the experimental test block, wherein the experimental test block is arranged in the experimental frame during testing, the experimental test block is made of rock, the middle of the rock is hollowed and filled with shotcrete, the lower part of the anchor rod is buried in the shotcrete, and the buried depth is equal to the thickness of the shotcrete.
2. The device for researching the influence mechanism of blasting vibration on the strength of the mortar anchor rod according to claim 1, wherein the reaction frame is a planar steel plate.
3. The device for researching the mechanism of the impact of blasting vibration on the strength of the mortar anchor rod according to claim 1, wherein the two steel plates and the two springs are arranged in an axisymmetric manner.
4. The apparatus of claim 1, wherein the drawing instrument is movable in a horizontal plane to align the bolt and in a vertical direction to draw the bolt.
5. The device for researching the influence mechanism of the blasting vibration on the strength of the mortar anchor rod according to claim 1, wherein the hollowed part of the test block penetrates through the bottom surface of the test block from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920024249.4U CN209745731U (en) | 2019-01-07 | 2019-01-07 | device for researching mechanism of influence of blasting vibration on strength of mortar anchor rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920024249.4U CN209745731U (en) | 2019-01-07 | 2019-01-07 | device for researching mechanism of influence of blasting vibration on strength of mortar anchor rod |
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| CN209745731U true CN209745731U (en) | 2019-12-06 |
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| CN201920024249.4U Expired - Fee Related CN209745731U (en) | 2019-01-07 | 2019-01-07 | device for researching mechanism of influence of blasting vibration on strength of mortar anchor rod |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520869A (en) * | 2019-01-07 | 2019-03-26 | 中国地质大学（武汉） | For studying the device and method of blasting vibration on grouted rockbolt intensity effect mechanism |
| CN112730013A (en) * | 2020-12-29 | 2021-04-30 | 中国地质大学（武汉） | Mortar anchor rod test piece manufacturing die for corrosion test |
| CN113203533A (en) * | 2021-04-06 | 2021-08-03 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for verifying support body of roadway with large rock burst |
-
2019
- 2019-01-07 CN CN201920024249.4U patent/CN209745731U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520869A (en) * | 2019-01-07 | 2019-03-26 | 中国地质大学（武汉） | For studying the device and method of blasting vibration on grouted rockbolt intensity effect mechanism |
| CN112730013A (en) * | 2020-12-29 | 2021-04-30 | 中国地质大学（武汉） | Mortar anchor rod test piece manufacturing die for corrosion test |
| CN112730013B (en) * | 2020-12-29 | 2022-01-28 | 中国地质大学（武汉） | Mortar anchor rod test piece manufacturing die for corrosion test |
| CN113203533A (en) * | 2021-04-06 | 2021-08-03 | 淮北市平远软岩支护工程技术有限公司 | Method and equipment for verifying support body of roadway with large rock burst |
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Granted publication date: 20191206 Termination date: 20210107 |