CN204536163U - Surrouding rock stress level of disruption proving installation - Google Patents
Surrouding rock stress level of disruption proving installation Download PDFInfo
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- CN204536163U CN204536163U CN201520167511.2U CN201520167511U CN204536163U CN 204536163 U CN204536163 U CN 204536163U CN 201520167511 U CN201520167511 U CN 201520167511U CN 204536163 U CN204536163 U CN 204536163U
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Abstract
The utility model relates to a kind of surrouding rock stress level of disruption proving installation.The purpose of this utility model is to provide a kind of surrouding rock stress level of disruption proving installation, with stress disturbance degree that is simple, rapid, that directly evaluate country rock, does not have an impact to state of surrounding rock.The technical solution of the utility model is: the packing device in wall rock drill-hole and the feeder outside country rock, packing device comprises two packers for shutoff wall rock drill-hole, pressure-bearing section cavity is formed between two packers, feeder comprises nitrogen pot, this nitrogen pot is through gasing pump, gas piping, flow sensor, reverse checkvalve is communicated with many logical switches, and be divided into three branch roads through many logical switches, article one, branch road is communicated with pressure-bearing section cavity through gas piping, another two branch roads are communicated with two packers respectively through gas piping, the gas piping of every bar branch road is equipped with stop valve and pressure-release valve, many logical switches are provided with the pressure transducer detecting each gas piping internal gas pressure, and this pressure transducer is electrically connected with tensimeter and registering instrument.
Description
Technical field
The utility model relates to a kind of surrouding rock stress level of disruption proving installation.Be applicable to underground engineering field.
Background technology
After Underground Engineering Excavation, country rock there will be stresses re-distribution, and the redistribution of stress will cause country rock to occur irrecoverable damage, and these damage mainly caused by propagation of internal cracks, and the inner structure of country rock therefore can be made also to produce permanent change.The coffer mechanics that these changes cause and hydraulic characteristic change can be tested by direct quantitative, as crack number statistics, sonic test, acoustic emission monitor(ing), permeability test etc.
Due to the difference that country rock affects by stresses re-distribution, in surrouding rock stress perturbing area, also there will be different level of disruption, the country rock near abutment wall is usually comparatively large by disturbing influence, occurs obvious fracture damage; The country rock that distance abutment wall is far away is then impaired lighter.Due to the difference of stress disturbance degree, above-mentioned method of testing is when being applied to scene, the limitation that ubiquity is certain, such as only have and work as crack opening, could occur that velocity of wave reduces phenomenon, and the region that stress disturbance is less, the opening width of crackle is generally less than normal even to be closed, and can't cause the change of country rock velocity of wave.Say for another example, when utilizing the perviousness change test of water, the inaccurate when change due to rock hydrophysical property can cause second test, especially for soft rock, this impact is more obvious, even can cause completing follow-up test.
Summary of the invention
The technical problems to be solved in the utility model is: for above-mentioned Problems existing, a kind of structure simple, lower-cost surrouding rock stress level of disruption proving installation is provided, with stress disturbance degree that is simple, rapid, that directly evaluate country rock, state of surrounding rock is not had an impact.
The technical scheme that the utility model adopts is: a kind of surrouding rock stress level of disruption proving installation, it is characterized in that: comprise the packing device be placed in wall rock drill-hole and the feeder be placed in outside country rock, described packing device comprises two packers for shutoff wall rock drill-hole, pressure-bearing section cavity is formed between two packers, described feeder comprises nitrogen pot, this nitrogen pot is through gasing pump, gas piping, flow sensor, reverse checkvalve is communicated with many logical switches, and be divided into three branch roads through many logical switches, article one, branch road is communicated with pressure-bearing section cavity through gas piping, another two branch roads are communicated with two packers respectively through gas piping, the gas piping of every bar branch road is equipped with stop valve and pressure-release valve, described many logical switches are provided with the pressure transducer detecting each gas piping internal gas pressure, and this pressure transducer is electrically connected with tensimeter and registering instrument.
Described packer is the expandable rubber plug of inflation.
The gas piping being positioned at pressure-bearing section cavity has some bleeder vents.
The beneficial effects of the utility model are: in the utility model, gas permeability test can not have an impact to state of surrounding rock, and repeatedly can test, and utilize hydraulic permeability to test, can change the state of country rock, such as water can make country rock saturated.Because stresses re-distribution causes damage, cause country rock inner structure to change, gas permeability test, compared to other method of testing, can more directly show.The utility model crag field of load comparatively wide (test segment length can reach 1m or longer), thus avoid the limitation of " point " stress state and the uneven impact of geologic condition.The utility model does not need rock reaction force to participate in calculating, and can avoid and that cause error inaccurate by mechanics value.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, the present embodiment is a kind of surrouding rock stress level of disruption proving installation, and this device comprises the packing device be placed on country rock in boring 13 and the feeder be placed in outside country rock.
Wherein packing device adopted two envelope method, carried out packing, formed pressure-bearing section cavity 131 between two packers 12, the packing of test section rock mass got up by two packers 12 to boring 13.In the present embodiment, packer 12 adopts the expandable rubber plug of inflation, shutoff boring 13 after rubber plug inflating pressure expands.
Feeder comprises nitrogen pot 1, and this example starts and Electrical Safety for ease of air pump, is configured with many logical switches 6.Nitrogen pot 1 is communicated with many logical switches 6 by gasing pump 2, gas piping 4, flow sensor 3, reverse checkvalve 5, and be divided into three branch roads through many logical switches 6, article one, branch road is communicated with pressure-bearing section cavity 131 through gas piping 4, stop valve 10, pressure-release valve 11, and some bleeder vent 4-1 are had on the gas piping 4 being positioned at pressure-bearing section cavity, another two branch roads are communicated with two rubber plugs as packer respectively through gas piping 4, stop valve 10, blowdown valve 11.This example is provided with pressure transducer 7 on many logical switches 6, and this pressure transducer detects the air pressure of each gas piping 4, and pressure transducer is electrically connected with tensimeter 8 and registering instrument 9.
In the present embodiment, the about 2 times of top covering rockmass deadweight of the voltage supply pressure requirements of feeder, to overcome the impact of terrestrial stress, makes gas overflowing.The steel tube end part that in this example, gas piping 4 adopts adopts external thread, and joint is internal thread, and sealing adopts and be wound around raw material band on steel pipe external thread, and steel tube end part cushioning nylon or steel plate washer, and the highest test pressure of penstock of this kind of structure is 30 ~ 40MPa.
The gas permeability method of testing that the present embodiment proposes is gaseous tension attenuation test, and by providing an original pressure at test zone, test along with gas oozes out caused decline of pressure from surrounding rock body, concrete grammar is as follows:
Carry out vertical drilling at the abutment wall of underground works, 13 degree of depth of holing are 2 times of underground chamber spans (the stress disturbed area degree of depth can not more than 2 Bei Dong footpaths), and aperture is 90mm, so that install as the rubber plug of packer 12;
By drilling rod, two expandable rubber plugs are placed into selected test section, pressurization makes it expand, and forms pressure-bearing section cavity 131;
Open gasing pump 2 pairs of pressure-bearing section cavity 131 gas injection pressurizations, borehole wall bears the gas pressure strengthened gradually, when pressure reaches threshold burst pressure, hole wall occurs breaking along a line of least resistance, and extends in the plane perpendicular to least principal stress on xsect;
Because breaking appears in hole wall, gas oozes out, and causes gas pressure value to occur declining, record gas input and the relation of time;
At different drilling depth place, place packer 12, carry out applied voltage test, formation different depth place gas oozes out speed and gathers.Based on the test result of most deep hole bottom, contrast with all the other depth test results, just can obtain different stress disturbance degree evaluation.
Claims (3)
1. a surrouding rock stress level of disruption proving installation, it is characterized in that: comprise the packing device be placed in wall rock drill-hole (13) and the feeder be placed in outside country rock, described packing device comprises two packers for shutoff wall rock drill-hole (13) (12), pressure-bearing section cavity (131) is formed between two packers (12), described feeder comprises nitrogen pot (1), this nitrogen pot is through gasing pump (2), gas piping (4), flow sensor (3), reverse checkvalve (5) is communicated with many logical switches (6), and be divided into three branch roads through many logical switches (6), article one, branch road is communicated with pressure-bearing section cavity (131) through gas piping (4), another two branch roads are communicated with two packers (12) respectively through gas piping (4), the gas piping (4) of every bar branch road is equipped with stop valve (10) and pressure-release valve (11), described many logical switches (6) are provided with the pressure transducer (7) detecting each gas piping internal gas pressure, and this pressure transducer is electrically connected with tensimeter (8) and registering instrument (9).
2. surrouding rock stress level of disruption proving installation according to claim 1, is characterized in that: described packer (12) is the expandable rubber plug of inflation.
3. surrouding rock stress level of disruption proving installation according to claim 1 and 2, is characterized in that: the gas piping (4) being positioned at pressure-bearing section cavity (131) has some bleeder vents (4-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520167511.2U CN204536163U (en) | 2015-03-24 | 2015-03-24 | Surrouding rock stress level of disruption proving installation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520167511.2U CN204536163U (en) | 2015-03-24 | 2015-03-24 | Surrouding rock stress level of disruption proving installation |
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| CN204536163U true CN204536163U (en) | 2015-08-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729969A (en) * | 2015-03-23 | 2015-06-24 | 中国电建集团华东勘测设计研究院有限公司 | Surrounding rock stress disturbing degree test device |
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2015
- 2015-03-24 CN CN201520167511.2U patent/CN204536163U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729969A (en) * | 2015-03-23 | 2015-06-24 | 中国电建集团华东勘测设计研究院有限公司 | Surrounding rock stress disturbing degree test device |
| CN104729969B (en) * | 2015-03-23 | 2018-03-13 | 中国电建集团华东勘测设计研究院有限公司 | Surrouding rock stress level of disruption test device |
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