CN2591602Y - Stepped hole type axial deformation measuring means - Google Patents
Stepped hole type axial deformation measuring means Download PDFInfo
- Publication number
- CN2591602Y CN2591602Y CN 02290599 CN02290599U CN2591602Y CN 2591602 Y CN2591602 Y CN 2591602Y CN 02290599 CN02290599 CN 02290599 CN 02290599 U CN02290599 U CN 02290599U CN 2591602 Y CN2591602 Y CN 2591602Y
- Authority
- CN
- China
- Prior art keywords
- stepped hole
- hole
- fixed head
- displacement transducer
- displacement sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an axial deformation measuring device in a stepped hole type used for in-situ measurement of stress in rock mass. The utility model is composed of a step type hole, a cross-shaped suspension arm-type displacement sensor with equal strength, a rigid connecting rod, and a fixing head. A concentric stepped hole is drilled on the bottom part of a sleeve drill hole; the fixing head is fixed in a small hole of the stepped hole by glue or expanded wood; four contact heads of the displacement sensor are tightly adhered to the step surface of the stepped hole; the displacement sensor is connected with the fixing head by the connecting rod. When the utility model is at interrupting sleeve drill, the axial displacement of a core section positioned between the contact heads of the displacement sensor and the fixing head can be measured reliably. The calibration test in the lab shows that the sensitivity coefficient of the device is 0.0001MM 2 / mu epsi, the linear range is 0.5MM, and the standard deviation is 0.999.
Description
Technical field
The utility model is used for the in-situ test of Geotechnical Engineering subject, with the stress state in measurement and the definite rock mass.
Background technology
Rock mass stress is a key factor that influences the rock mass engineering project security, and therefore, for medium-and-large-sized rock mass engineering project, the rock mass stress measurement is an obligato job.It is stress relief method that rock mass stress is measured the most frequently used method, or claims over-coring method (Over coving).The step of this method is to use φ 75～130mm bit drills to tested place earlier; Then at the aperture of hole subdrilling one φ 36mm, installation position displacement sensor in aperture again, directly at the bottom of the hole or hole wall paste foil gauge; Overlap brill at last, to remove edge stress, the variation of survey sensor or foil gauge is simultaneously also passed through the theoretical formula calculated stress.Theoretical and on-the-spot comparative test result all shows, adopt the method for displacement transducer comparatively reasonable, reliable, but a diameter only for 36mm, the unusual difficulty of axial displacement meter more than 3 is installed in being about to the aperture of 300mm, therefore long-term this method of employing only limits to measure two-dimensional stress, if need obtain triaxiality then needs to measure in three borings that cross, increase workload greatly, thereby limited the practical value of this method.Therefore, the axial deformation measurement has limited the application of over-coring method.
Summary of the invention
In order to solve the application problem of restriction over-coring method in the axial deformation measurement, the utility model proposes a kind of step cellular type axial deformation measurement mechanism.This device stepped hole of center of circle different-diameter, stepped hole φ 50mm, center pit φ 36mm replace same footpath aperture in the past, installation position displacement sensor on step surface, in center pit, install and fix head, and with rigidity link rod (8) displacement transducer and fixed head are linked, so the rock mass axial deformation between displacement transducer and the fixed head just can be measured reliably by displacement transducer.In order to reduce the error that the inhomogeneous axial deformation of step surface causes everywhere, displacement transducer is designed to cruciform four contacts (going into contact if need also to be designed to diesis shape), the average value measured of getting four contacts is the axial deformation value, can make measurement result more reliable.Criss-cross each arm is an equal strength semi-girder, and the upper and lower surface of beam respectively pastes a slice foil gauge, forms bridge.With the displacement of its measuring vertical in Liangping face direction, sensitivity can reach 0.0001mm.
Description of drawings
Accompanying drawing 1 is a step cellular type axial deformation measurement mechanism structural drawing
Embodiment
In conjunction with the accompanying drawings the utility model is described in further detail.This device is used for the test of in site measurement rock mass stress, is made up of stepped bore, cross equi intensity cantilever formula displacement transducer, rigidity link rod and fixed head.Make a call to a concentric stepped hole at the cover foot of hole, with viscose glue or expand and wooden fixed head to be fixed in the center pit of stepped hole, four contacts of displacement transducer are close on the step surface of stepped hole, displacement transducer and fixed head link with link rod.When interrupted cover bored, the axial displacement of the core section between sensor contact and fixed head just can be measured reliably.Among the figure, the releasing hole (1) of boring φ 75～130mm is to the measured point, near and smooth step aperture (2).Bore the stepped hole (3) of φ 50mm, be about 200mm, and at the bottom of the smooth stepped hole (4).The center pit of φ 36mm (5) is about 150mm in the brill, at the bottom of the center pit (6).With the immersion of the wood of the expansion on the fixed head (7), rapidly fixed head (7), rigidity link rod (8), shaft position sensor (9) are done the as a whole hole of putting into then, and four contacts (10) of shaft position sensor (9) are on (4) at the bottom of the stepped hole earlier.Fixed head and step surface distance are 110mm.Fixed head is fixed, and with displacement transducer on line and zeroing.Be drilled into the annular bit headgear of φ 75～130mm and remove (11) at the bottom of the hole, the core that fractures, and read the axial deformation measured value.
Claims (1)
1, a kind of step cellular type axial deformation measurement mechanism that is used for the test of in site measurement rock mass stress is made up of stepped bore, cross equi intensity cantilever formula displacement transducer, rigidity link rod and fixed head.It is characterized in that: with concentric, but the step surface of different-diameter stepped hole is as center of effort; Cross each arm of equi intensity cantilever formula displacement transducer is an equal strength semi-girder, and the upper and lower surface of beam respectively pastes a slice foil gauge; Make a call to a concentric stepped hole at the cover foot of hole, with the viscose glue or the wood that expands fixed head (7) is fixed in the center pit (5) of stepped hole, four contacts (10) of displacement transducer (9) are close on the step surface of stepped hole, displacement transducer (9) links with link rod (8) with fixed head (7), when interrupted cover bores, the axial displacement of the core section of energy reliable measurements between sensor contact and fixed head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02290599 CN2591602Y (en) | 2002-12-24 | 2002-12-24 | Stepped hole type axial deformation measuring means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02290599 CN2591602Y (en) | 2002-12-24 | 2002-12-24 | Stepped hole type axial deformation measuring means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2591602Y true CN2591602Y (en) | 2003-12-10 |
Family
ID=33749768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02290599 Expired - Fee Related CN2591602Y (en) | 2002-12-24 | 2002-12-24 | Stepped hole type axial deformation measuring means |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2591602Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449063C (en) * | 2007-01-16 | 2009-01-07 | 聂德新 | Dead load type subbase deformation measuring method and device |
| CN101493366B (en) * | 2009-01-09 | 2011-01-05 | 陈洪凯 | Drilling hole stress sensor and drilling hole stress monitoring method thereof |
| CN102778310A (en) * | 2012-07-12 | 2012-11-14 | 南京航空航天大学 | Force transducer capable of calibrating multiple angles |
| CN105181199A (en) * | 2015-05-13 | 2015-12-23 | 中国科学院武汉岩土力学研究所 | Side hole stress releasing method of ground stress test |
| CN108332697A (en) * | 2018-04-24 | 2018-07-27 | 宜昌市睿程佑自动化设备有限公司 | The step drop dimension measuring device of step-like object |
| CN110925020A (en) * | 2019-12-05 | 2020-03-27 | 华北科技学院 | Multi-parameter monitoring device and method for rock burst in coal mine main roadway area |
-
2002
- 2002-12-24 CN CN 02290599 patent/CN2591602Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100449063C (en) * | 2007-01-16 | 2009-01-07 | 聂德新 | Dead load type subbase deformation measuring method and device |
| CN101493366B (en) * | 2009-01-09 | 2011-01-05 | 陈洪凯 | Drilling hole stress sensor and drilling hole stress monitoring method thereof |
| CN102778310A (en) * | 2012-07-12 | 2012-11-14 | 南京航空航天大学 | Force transducer capable of calibrating multiple angles |
| CN105181199A (en) * | 2015-05-13 | 2015-12-23 | 中国科学院武汉岩土力学研究所 | Side hole stress releasing method of ground stress test |
| CN105181199B (en) * | 2015-05-13 | 2017-08-25 | 中国科学院武汉岩土力学研究所 | A kind of side hole stress relief method of detecting earth stress |
| CN108332697A (en) * | 2018-04-24 | 2018-07-27 | 宜昌市睿程佑自动化设备有限公司 | The step drop dimension measuring device of step-like object |
| CN110925020A (en) * | 2019-12-05 | 2020-03-27 | 华北科技学院 | Multi-parameter monitoring device and method for rock burst in coal mine main roadway area |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |