CN102162357B - Method for testing in-situ internal stress of vertical shaft wall - Google Patents
Method for testing in-situ internal stress of vertical shaft wall Download PDFInfo
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- CN102162357B CN102162357B CN 201110079624 CN201110079624A CN102162357B CN 102162357 B CN102162357 B CN 102162357B CN 201110079624 CN201110079624 CN 201110079624 CN 201110079624 A CN201110079624 A CN 201110079624A CN 102162357 B CN102162357 B CN 102162357B
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- shaft wall
- vertical shaft
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title abstract description 7
- 238000011065 in-situ storage Methods 0.000 title abstract 2
- 239000011888 foil Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000004080 punching Methods 0.000 abstract 5
- 238000003745 diagnosis Methods 0.000 abstract 1
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to a method for testing in-situ internal stress of vertical shaft wall comprising steps of punching two holes in inner surface of the vertical shaft wall, testing the strain change on middle part of two holes, and calculating the internal stress of the vertical shaft wall according to the before and after strain variance on hole punching. Specifically, the method comprises steps of determining and marking the position of holes on the surface of to be tested vertical shaft wall; pasting the transverse and vertical strain gauges on middle part between two holes, connecting the data wire and testing the strain initial value; punching holes on marked part and testing the strain increment of the strain gauges; and calculating the internal stress of the vertical shaft wall according to the before and after strain variance of the hole punching. In other words, the last step is to calculate the stress according to the before and after concrete strain variance of the vertical shaft wall on hole punching. The method is simple without destroying the integrity of vertical shaft wall, and the test with high precision lays the fundation of safety evaluation diagnosis for vertical shaft wall.
Description
Technical field:
The present invention relates to the home position testing method of the existing stress of a kind of shaft wall, be specially adapted to the test of the current stress intensity of the thick surface soil borehole wall, also be applicable to the test of other similar concrete wallings (structure).
Background technology:
The shaft of vertical well great majority that are in thick alluvium have been runed for many years, and stress and the stress intensity of the borehole wall are unclear, and this enforcement for the prediction of shaft rupture and shaft wall fracture prevention and cure project brings difficulty.Obtain the existing stress of the borehole wall, judge that its safety is necessary, especially build the borehole wall for a long time.At present the home position testing method of the existing stress of the test borehole wall mainly contains stress relief method, hydraulic fracturing etc., and these method of testing complicated operations, to take the pit shaft time long, larger to shaft lining breakage.Therefore, it is necessary inventing the existing stress home position testing method of a kind of comparatively ideal borehole wall, will become the important means of judgement sidewall safety.
Summary of the invention:
The objective of the invention is to overcome the problem that prior art exists, a kind of home position testing method of simple to operation, the existing stress of shaft wall that little to shaft lining breakage, certainty of measurement is high is provided.
The home position testing method of the existing stress of shaft wall of the present invention comprises the steps:
A. demarcate the position of two borings to be measured every 10 ~ 20m recurrence interval on the same axis that is positioned at pit shaft vertical depth 50 ~ 200m scope;
B. two bore positions to be measured of borehole wall interval demarcation carried out surface clean;
C. after, paste two horizontal, vertical foil gauges at right angles arranging on the borehole wall between two bore positions to be measured of interval demarcation, the test data wire that connects two horizontal, vertical foil gauges is connected with the strain testing instrument;
D. open the strain testing instrument, the beginning data acquisition, and record the strain initial value
The position of two borings to be measured of e. demarcating at the interval is implemented boring one by one, bored first hole after pause 5min bore again second hole;
F. hole complete after, continue to gather strain data until data stabilization records final strain stable value
G. obtain the strain variation value according to two strain values before and after two boring perforates to be measured
H. according to the strain variation value
With existing stress
Functional relation:
Calculate the existing stress value of the borehole wall to be measured.
The center to center distance distance of described boring to be measured is 8 ~ 16cm, and bore diameter is 4 ~ 8cm; The drilling depth of described boring to be measured is controlled at 4 ~ 6cm.
Beneficial effect: by opening diplopore in borehole wall surface, the strain variation of testing bore holes middle part is calculated the stress intensity of the borehole wall according to the change amount of strain before and after perforate.It is simple to operate, takies the pit shaft time short, does not substantially affect mine hoisting; The required space of implementation and operation is less, is particularly useful for the little characteristics in underground structure operating space, deep such as pit shaft; Can not destroy the integrality of the borehole wall.Its major advantage has:
1. the acquisition of the existing stress of the borehole wall is the key factor to the shaft wall structure safety evaluation;
2. the method for the existing stress of the acquisition borehole wall that proposes, simple to operate, take the pit shaft time short, substantially do not affect mine hoisting;
3. the required space of method implementation and operation is less, is particularly useful for the little characteristics in underground structure operating space, deep such as pit shaft;
4. do not destroy the integrality of the borehole wall.
Description of drawings:
Fig. 1 is the schematic diagram of method of testing of the present invention.
In figure: boring-1, data test line-2, strain transducer-3, the borehole wall-4.
The specific embodiment:
Shown in Figure 1, the home position testing method of the existing stress of shaft wall of the present invention is by opening diplopore, change amount before and after the middle part strain perforate of test diplopore, according to the functional relation between this change amount and the existing stress of the borehole wall, calculate the existing stress value of the borehole wall, concrete steps are as follows:
A. at first be positioned at pit shaft vertical depth 50 ~ 200m place scope, demarcating the position of two borings 2 to be measured every 10 ~ 20m recurrence interval on same axis;
B. surface clean is carried out in two boring to be measured 2 positions the borehole wall 1 interval being demarcated;
C. after, paste two horizontal, vertical foil gauges 3 at right angles arranging on the borehole wall 1 between two boring to be measured 2 positions demarcating at the interval, the test data wire 4 that connects two horizontal, vertical foil gauges 3 is connected with the strain testing instrument;
D. open the strain testing instrument, the beginning data acquisition, and record the strain initial value
The position of two borings 2 to be measured of e. demarcating at the interval is implemented boring one by one, after having bored first hole, pause 5min bores second hole again, the center to center distance distance of boring 2 to be measured is 8 ~ 16cm, and bore diameter is 4 ~ 8cm, and the drilling depth of boring 2 to be measured is controlled at 4 ~ 6cm;
F. hole complete after, continue to gather strain data until data stabilization records final strain stable value
G. obtain the strain variation amount according to two strain values before and after two boring 2 perforates to be measured
H. according to the strain variation value
With existing stress
Functional relation:
Even calculate the existing stress value of the borehole wall 1 to be measured, in formula:
Existing stress value for the borehole wall 4;
The strain variation value that obtains for test.
Claims (1)
1. the home position testing method of the existing stress of shaft wall, is characterized in that comprising the steps:
A. demarcate the position of two borings to be measured (2) every 10 ~ 20m recurrence interval on the same axis that is positioned at pit shaft vertical depth 50 ~ 200m scope;
B. surface clean is carried out in two borings to be measured (2) position of the borehole wall (1) interval being demarcated;
C. after, the borehole wall (1) between two borings to be measured (2) position of demarcating at the interval is upper paste at right angles arrange one laterally, a vertical foil gauge (3), will connect horizontal, vertical two test data wires (4) to foil gauge (3) and be connected with the strain testing instrument;
D. open the strain testing instrument, the beginning data acquisition, and record the strain initial value
The position of two borings to be measured (2) of e. demarcating at the interval is implemented boring one by one, bored first hole after pause 5min bore again second hole;
F. hole complete after, continue to gather strain data until data stabilization records final strain stable value
G. obtain the strain variation value according to two strain values before and after two borings to be measured (2) perforate
H. according to the strain variation value
With existing stress
Between functional relation:
Calculate the existing stress value of the borehole wall to be measured (1).
2. the home position testing method of the existing stress of shaft wall according to claim 1 is characterized in that: the center to center distance distance of described boring to be measured (2) is 8 ~ 16cm, and bore diameter is 4 ~ 8cm.
3. the home position testing method of the existing stress of shaft wall according to claim 1 and 2, it is characterized in that: the drilling depth of described boring to be measured (2) is controlled at 4 ~ 6cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110079624 CN102162357B (en) | 2011-03-31 | 2011-03-31 | Method for testing in-situ internal stress of vertical shaft wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110079624 CN102162357B (en) | 2011-03-31 | 2011-03-31 | Method for testing in-situ internal stress of vertical shaft wall |
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| Publication Number | Publication Date |
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| CN102162357A CN102162357A (en) | 2011-08-24 |
| CN102162357B true CN102162357B (en) | 2013-05-22 |
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| CN 201110079624 Expired - Fee Related CN102162357B (en) | 2011-03-31 | 2011-03-31 | Method for testing in-situ internal stress of vertical shaft wall |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034453B (en) * | 2014-06-05 | 2016-05-18 | 同济大学 | Concrete-bridge single shaft original position storage stress detection method based on substep jumping through rings |
| CN109696263A (en) * | 2019-02-21 | 2019-04-30 | 广西大学 | A kind of device and test method for testing the existing stress of concrete |
| CN113739963A (en) * | 2021-05-19 | 2021-12-03 | 中国电建集团贵阳勘测设计研究院有限公司 | Method for testing concrete surface stress |
| CN115127716B (en) * | 2022-09-01 | 2022-11-25 | 云南省交通投资建设集团有限公司 | Rock mass parameter in-situ test system and method by small local wall stress relief method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2798698A1 (en) * | 1999-09-22 | 2001-03-23 | Gaiatech | Testing ground characteristics using expansive pressure probe with augmented vertical stress is accompanied by circulating water through the ground, between injection and pumping cells |
| CN2549449Y (en) * | 2002-06-18 | 2003-05-07 | 大庆石油管理局 | Device for measuring strains of casing and formation by expansion of oil well cement ring |
| CN101392647A (en) * | 2008-11-14 | 2009-03-25 | 北京石大联创石油新技术有限公司 | Borehole wall stability prediction method suitable for gas drilling |
| CN101560872A (en) * | 2009-05-26 | 2009-10-21 | 盐城彩阳电器阀门有限公司 | Integral combined cable-passing packer for deep well |
| WO2010083166A2 (en) * | 2009-01-13 | 2010-07-22 | Schlumberger Canada Limited | In-situ stress measurements in hydrocarbon bearing shales |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6662644B1 (en) * | 2002-06-28 | 2003-12-16 | Edm Systems Usa | Formation fluid sampling and hydraulic testing tool |
| US8146416B2 (en) * | 2009-02-13 | 2012-04-03 | Schlumberger Technology Corporation | Methods and apparatus to perform stress testing of geological formations |
-
2011
- 2011-03-31 CN CN 201110079624 patent/CN102162357B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2798698A1 (en) * | 1999-09-22 | 2001-03-23 | Gaiatech | Testing ground characteristics using expansive pressure probe with augmented vertical stress is accompanied by circulating water through the ground, between injection and pumping cells |
| CN2549449Y (en) * | 2002-06-18 | 2003-05-07 | 大庆石油管理局 | Device for measuring strains of casing and formation by expansion of oil well cement ring |
| CN101392647A (en) * | 2008-11-14 | 2009-03-25 | 北京石大联创石油新技术有限公司 | Borehole wall stability prediction method suitable for gas drilling |
| WO2010083166A2 (en) * | 2009-01-13 | 2010-07-22 | Schlumberger Canada Limited | In-situ stress measurements in hydrocarbon bearing shales |
| CN101560872A (en) * | 2009-05-26 | 2009-10-21 | 盐城彩阳电器阀门有限公司 | Integral combined cable-passing packer for deep well |
Non-Patent Citations (1)
| Title |
|---|
| 用于煤层底板突水机理研究的岩体原位测试技术;李抗抗; 王成绪;《煤田地质与勘探》;19970630(第3期);第31-34页 * |
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| CN102162357A (en) | 2011-08-24 |
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