CN204086017U - A kind of rock twin shaft unloader test device - Google Patents
A kind of rock twin shaft unloader test device Download PDFInfo
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- CN204086017U CN204086017U CN201420565138.1U CN201420565138U CN204086017U CN 204086017 U CN204086017 U CN 204086017U CN 201420565138 U CN201420565138 U CN 201420565138U CN 204086017 U CN204086017 U CN 204086017U
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- cushion block
- frame
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- rock
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Abstract
The utility model discloses a kind of rock twin shaft unloader test device, comprise base, longitudinal load sensor, Transverse load sensors and long guideway, base is provided with gate-type loading frame and lower cushion block, and described gate-type loading frame is provided with longitudinal loading motor; Longitudinal loading motor lower end is connected with upper cushion block, is provided with sample between upper cushion block and lower cushion block; Long guideway is provided with horizontal loading system, horizontal loading system comprises frame, servomotor and two closure plates, servomotor is arranged in frame, be connected with screw mandrel respectively by reductor, screw mandrel is connected with left briquetting by nut, one closure plate is located in frame, and another closure plate is connected with frame by pull bar, and this another closure plate is provided with right briquetting.The utility model can realize rigidity unloader test such as the twin shafts of sample well, and research size effect is on the impact of rock Unloading Mechanics performance; And the mechanism of action of two-way unloding speed to rock mass failure can be studied very well.
Description
Technical field
The utility model relates to a kind of rock test equipment, particularly relates to a kind of rock twin shaft unloader test device.
Background technology
For making full use of existing mine resources, many mines transfer strip mining transformation to by underground mining, in changing underground into opencast mining process, first the underground mining of ore body is carried out, relate to the first time off-load of mining rock, after transferring outdoor stripping exploitation to, be actually the second time off-load of Goaf Area top board and strip mining transformation step common rock mass in the vertical direction, this secondary off-load all can to common rock mass generation damage in various degree, simultaneously owing to there is certain time interval in secondary unloading process, rheologic time also can occur common rock mass destroys.Through the multi-form Rock Mass Unloading of secondary, its stress field and displacement field all there occurs respective change, and when common rock mass just may produce destruction by during disturbance again, mainly there is the safe top board in goaf and subside or the potential safety hazard of side slope or goaf wall rock destabilization.Therefore, carry out the research of Rock Mass Unloading failure test and there is important engineer applied value.
Biaxial stress state is a kind of typical stress in nature rock, under secondary Excavation, there will be plane stress state, i.e. twin shaft unloading condition σ 1 >=σ 2, σ 3=0.Rock Unloading Mechanics characteristic test research is just achieved after rock normal triaxial instrument comes out, current off-load research is mainly based on false three axles of rock and true triaxial test system, false triaxial test system usually adopts permanent axial compression (σ 1) to unload confined pressure (σ 2=σ 3) or adds Stress Control mode or the displacement-control mode that confined pressure (σ 2=σ 3) is unloaded in axial compression (σ 1), but material properties of rock is obviously different from mechanical property under false triaxial stress state under biaxial stress state, existence simultaneously cannot realize confined pressure and is greater than the test of axial compression and cannot observes rock fracture spread scenarios, true triaxial test system can realize unloading test under σ 3=0 condition, but load capability is little thus cannot test large-size test specimen and cannot carry out the rigidity unloadings such as two-way to test specimen.
Summary of the invention
For prior art Problems existing, the utility model object is to provide a kind of rock twin shaft unloader test device that can carry out twin shaft unloader test to large-size rock.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: comprise base, longitudinal load sensor, Transverse load sensors and long guideway, base is provided with gate-type loading frame and lower cushion block, lower cushion block is arranged in gate-type loading frame, and described gate-type loading frame back timber bottom surface is provided with longitudinal loading motor; Longitudinal loading motor lower end is connected with upper cushion block, is provided with sample between upper cushion block and lower cushion block; Long guideway is provided with horizontal loading system, horizontal loading system comprises frame, servomotor, screw mandrel, pull bar and two closure plates, servomotor is arranged in frame, is connected respectively by reductor with screw mandrel, and screw mandrel is parallel with long guideway, screw mandrel is provided with nut, nut is connected with left briquetting towards sample end, and a closure plate is fixed in frame, and another closure plate is connected with frame by pull bar, this another closure plate is provided with right briquetting towards the face of sample, and left briquetting and right briquetting are positioned at the both sides of sample; Described longitudinal load sensor between longitudinal loading motor and upper cushion block or between cushion block and sample or between sample and lower cushion block; Described Transverse load sensors is between nut and left briquetting.
In above-mentioned rock twin shaft unloader test device, described longitudinal load sensor is between longitudinal loading motor and upper cushion block.
In above-mentioned rock twin shaft unloader test device, the bottom of described closure plate is provided with roller, is placed on long guideway by roller.
In above-mentioned rock twin shaft unloader test device, be provided with supporting leg bottom described long guideway, the bottom of base is provided with levelling bolt.
Compared with prior art, the beneficial effects of the utility model are: the utility model comprises longitudinal charger and horizontal charger, can realize well, to rigidity unloader test such as the twin shafts of sample, observed and recorded being carried out to the Unloading Mechanics performance under strength condition behind rock sample peak; Can to the rectangular parallelepiped specimen test of large-size, research size effect is on the impact of rock Unloading Mechanics performance; And the mechanism of action of two-way unloding speed to rock mass failure can be studied very well.
The utility model can study country rock twin shaft mechanical characteristic better, makes test findings more have practical meaning in engineering, and the restrained boundary condition with timer is simple, is easy to control; Sample is two-dimensional rectangle cross section, and group structure is simple, from macroscopic view and carefully can see angle, follows the tracks of sample crack propagation situation continuously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Marginal data:
1-base 2-levelling bolt 3-supporting leg
4-long guideway 5-servomotor 6-closure plate
7-leading screw 8-pull bar 9-Transverse load sensors
10-left briquetting 11-gate-type loading frame
12-longitudinal loading motor 13-longitudinal load sensor
The right briquetting of 14-upper cushion block 15-sample 16-
17-lower cushion block 18-frame 19-reductor
20-closure plate 61-roller 201-roller.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in more detail.
As shown in Figure 1, the utility model comprises base 1, longitudinal load sensor 13, Transverse load sensors 9 and long guideway 4, base 1 is provided with gate-type loading frame 11 and lower cushion block 17, the bottom of base 1 is provided with levelling bolt 2, described lower cushion block 17 is arranged in gate-type loading frame 11, and the back timber bottom surface of described gate-type loading frame 11 is provided with longitudinal loading motor 12; The lower end of longitudinal loading motor 12 is connected with upper cushion block 14, is provided with longitudinal load sensor 13 between longitudinal loading motor 12 and upper cushion block 14.Sample 15 is provided with between upper cushion block 14 and lower cushion block 17.Described longitudinal load sensor 13 can also be arranged between cushion block 14 and sample 15, or between sample 15 and lower cushion block 17.
Long guideway 4 is provided with horizontal loading system, described horizontal loading system comprises servomotor 5, frame 18, screw mandrel 7, pull bar 8 and two closure plates 6,20, servomotor 5 is arranged in frame 18, is connected respectively by reductor 19 with screw mandrel 7, and screw mandrel 7 is parallel with long guideway 4.Screw mandrel 7 is provided with nut 71, and nut 71 is connected with left briquetting 10 towards sample 15 end, and closure plate 6 is arranged in frame 18, and the side towards sample 15 away from the closure plate 20 of servomotor 5 is provided with right briquetting 16, and closure plate 20 is connected with frame 18 by pull bar 8.Left briquetting 10 and right briquetting 16 are positioned at the both sides of sample 15; Described Transverse load sensors 9 is between nut 71 and left briquetting 10.The bottom of described closure plate 6 is provided with roller 61, is placed on long guideway 4 by roller 61.The bottom of closure plate 20 is provided with roller 201, is placed on long guideway 4 by roller 201.Supporting leg 3 is provided with bottom described long guideway 4.
Concrete operation step is as follows:
To two-dimentional load-bearing rock mass, its off-load has two kinds of modes, and one is major principal stress σ 1 off-load, and another kind is least principal stress σ 2 off-load.
Major principal stress σ 1 off-load operation steps:
1, according to testing requirements, the standard-sized uniaxial compressive strength value of sample 15 is measured.
2, the sample 15 of suitable size is placed between upper cushion block 14 and lower cushion block 17 reposefully, by longitudinal loading motor 12, apply longitudinal loading σ 1 and horizontal cross load σ 2 to original pressure predetermined value by hydrostatic conditions, this value can be determined by Transverse load sensors 9 and longitudinal load sensor 13.
3, keep horizontal original pressure predetermined value constant, after increasing longitudinal loading σ 1 to measured uniaxial compressive strength value, with different rates removal longitudinal loading σ 1, observation sample 15 destroys situation.
Least principal stress σ 2 off-load operation steps:
1, according to testing requirements, the standard-sized uniaxial compressive strength value of sample 15 is measured.
2, large for suitable size small sample 15 is placed between upper cushion block 14 and lower cushion block 17 reposefully, by longitudinal loading motor 12, longitudinal loading σ 1 and horizontal cross load σ 2 is applied to original pressure predetermined value by hydrostatic conditions, this value can be determined by Transverse load sensors 9 and longitudinal load sensor 13
3, keep horizontal original pressure predetermined value constant, after increasing longitudinal loading σ 1 to measured uniaxial compressive strength value, keep longitudinal loading σ 1 constant.
4, with different rates removal horizontal cross load σ 2, until sample 15 destroys.
The utility model is a kind of rock twin shaft unloader test device, and the utility model can realize rigidity unloader test such as the twin shafts of sample well, has important engineering significance to the two-way mechanism of action of unloding speed to rock mass failure that adds of research.
Above embodiment is the utility model one better embodiment, but is not the whole of the utility model content, and all equivalents done in the utility model scope and change, all will within the utility model protection domain.
Claims (4)
1. a rock twin shaft unloader test device, it is characterized in that: comprise base, longitudinal load sensor, Transverse load sensors and long guideway, base is provided with gate-type loading frame and lower cushion block, lower cushion block is arranged in gate-type loading frame, and described gate-type loading frame back timber bottom surface is provided with longitudinal loading motor; Longitudinal loading motor lower end is connected with upper cushion block, is provided with sample between upper cushion block and lower cushion block; Long guideway is provided with horizontal loading system, horizontal loading system comprises frame, servomotor, screw mandrel, pull bar and two closure plates, servomotor is arranged in frame, is connected respectively by reductor with screw mandrel, and screw mandrel is parallel with long guideway, screw mandrel is provided with nut, nut is connected with left briquetting towards sample end, and a closure plate is fixed in frame, and another closure plate is connected with frame by pull bar, this another closure plate is provided with right briquetting towards the face of sample, and left briquetting and right briquetting are positioned at the both sides of sample; Described longitudinal load sensor between longitudinal loading motor and upper cushion block or between cushion block and sample or between sample and lower cushion block; Described Transverse load sensors is between nut and left briquetting.
2. rock twin shaft unloader test device according to claim 1, is characterized in that: described longitudinal load sensor is between longitudinal loading motor and upper cushion block.
3. rock twin shaft unloader test device according to claim 1, is characterized in that: the bottom of two described closure plates is equipped with roller, is placed on long guideway by roller.
4. rock twin shaft unloader test device according to claim 1, it is characterized in that: be provided with supporting leg bottom described long guideway, the bottom of base is provided with levelling bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420565138.1U CN204086017U (en) | 2014-09-29 | 2014-09-29 | A kind of rock twin shaft unloader test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420565138.1U CN204086017U (en) | 2014-09-29 | 2014-09-29 | A kind of rock twin shaft unloader test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204086017U true CN204086017U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420565138.1U Expired - Fee Related CN204086017U (en) | 2014-09-29 | 2014-09-29 | A kind of rock twin shaft unloader test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204086017U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289996A (en) * | 2016-10-26 | 2017-01-04 | 中国科学院武汉岩土力学研究所 | A kind of device carrying out true and false triaxial test |
| CN106644729A (en) * | 2016-10-28 | 2017-05-10 | 中南大学 | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source |
| CN106644689A (en) * | 2016-11-17 | 2017-05-10 | 中国矿业大学 | Adjustable lateral pressure loading device and test method used for rock biaxial test |
| CN106769514A (en) * | 2017-01-13 | 2017-05-31 | 绍兴文理学院 | The multiple dimensioned testing machine transverse direction loading device of rock uniaxiality strength |
| CN107796704A (en) * | 2017-10-13 | 2018-03-13 | 淮阴师范学院 | A kind of plastics water tower container experiment compression test device |
| CN108318351A (en) * | 2018-01-04 | 2018-07-24 | 河北工业大学 | A kind of test method for testing rock shearing mechanical property under normal direction Excavation |
| CN109520818A (en) * | 2018-12-18 | 2019-03-26 | 中国工程物理研究院化工材料研究所 | A kind of high polymer bonding explosive test method and test tool |
| CN112903462A (en) * | 2021-02-04 | 2021-06-04 | 太原理工大学 | Device and method for testing bearing capacity of single-row group column in horizontal goaf under double-shaft loading |
-
2014
- 2014-09-29 CN CN201420565138.1U patent/CN204086017U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289996A (en) * | 2016-10-26 | 2017-01-04 | 中国科学院武汉岩土力学研究所 | A kind of device carrying out true and false triaxial test |
| CN106644729A (en) * | 2016-10-28 | 2017-05-10 | 中南大学 | Low-confining-pressure static and dynamic triaxial testing system based on MTS power source |
| CN106644689A (en) * | 2016-11-17 | 2017-05-10 | 中国矿业大学 | Adjustable lateral pressure loading device and test method used for rock biaxial test |
| CN106769514A (en) * | 2017-01-13 | 2017-05-31 | 绍兴文理学院 | The multiple dimensioned testing machine transverse direction loading device of rock uniaxiality strength |
| CN107796704A (en) * | 2017-10-13 | 2018-03-13 | 淮阴师范学院 | A kind of plastics water tower container experiment compression test device |
| CN108318351A (en) * | 2018-01-04 | 2018-07-24 | 河北工业大学 | A kind of test method for testing rock shearing mechanical property under normal direction Excavation |
| CN109520818A (en) * | 2018-12-18 | 2019-03-26 | 中国工程物理研究院化工材料研究所 | A kind of high polymer bonding explosive test method and test tool |
| CN112903462A (en) * | 2021-02-04 | 2021-06-04 | 太原理工大学 | Device and method for testing bearing capacity of single-row group column in horizontal goaf under double-shaft loading |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150107 Termination date: 20170929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |