WO2013149599A1 - 基于流变应力恢复原理的深部软岩地应力测试方法和装置 - Google Patents
基于流变应力恢复原理的深部软岩地应力测试方法和装置 Download PDFInfo
- Publication number
- WO2013149599A1 WO2013149599A1 PCT/CN2013/075686 CN2013075686W WO2013149599A1 WO 2013149599 A1 WO2013149599 A1 WO 2013149599A1 CN 2013075686 W CN2013075686 W CN 2013075686W WO 2013149599 A1 WO2013149599 A1 WO 2013149599A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- way pressure
- stress
- pressure boxes
- boxes
- test
- Prior art date
Links
- 238000010998 test method Methods 0.000 title abstract description 6
- 238000011084 recovery Methods 0.000 title description 3
- 239000011435 rock Substances 0.000 claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000011065 in-situ storage Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000009662 stress testing Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C39/00—Devices for testing in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0004—Force transducers adapted for mounting in a bore of the force receiving structure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
- G01L5/1627—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of strain gauges
Definitions
- the invention belongs to the technical field of geotechnical measurement, in particular to a method for testing ground stress suitable for deep soft rock, and also relates to an observation device for the test method. Background technique
- the drilling packer needs to have good water sealing under high water pressure, and imposes stringent requirements on the integrity of the rock mass. It is not suitable for the broken soft rock mass developed by deep joints and fissures in coal mines. Moreover, the method can only determine the maximum principal stress and the minimum principal stress perpendicular to the plane of the borehole. In essence, it is a two-dimensional stress measurement method, and it is difficult to obtain the three-direction stress state of the measuring point.
- Another common test method is the stress relieving method.
- the mechanical properties of the rock mass such as elastic modulus E and Poisson's ratio ⁇
- the mechanical properties such as elastic modulus ⁇ and Poisson's ratio ⁇ are closely related to the stress state of the rock mass and the size and shape of the rock specimen.
- the values of elastic modulus ⁇ and Poisson's ratio ⁇ obtained by the test may differ by several times or even ten times.
- the existing direct measuring equipment is mainly used in a pressure box in a soil, such as a resistance strained shaft type earth pressure box disclosed in the Chinese utility model patent (Application No. 03212896), which utilizes a ring.
- the strain gauges coated on the elastic diaphragm record the compression deformation of the elastic diaphragm to achieve the purpose of measuring the pressure perpendicular to the diaphragm direction.
- a utility model patent Application No.
- the technical problem to be solved by the present invention is to provide a method for measuring the in-situ stress suitable for soft rock. Through this method, the stress value inside the surrounding rock can be directly measured, and the observation data can be obtained for a long time, which is used for the study of the stress distribution and surrounding rock stability of the soft rock in the deep coal mine.
- a deep soft rock ground stress test method based on the principle of flow stress recovery comprising the following steps:
- the three-way pressure box has three working faces perpendicular to each other, and recording between the three three-way pressure boxes The cosine of the direction between the normal directions of any two working faces, and the value must not be 1;
- two three-way pressure boxes are equipped with a device for measuring normal compressive stress on each working surface, the device passes the data line and the drill a reader outside the hole is connected;
- the above-mentioned method is used to perform multiple measurements for a long time, and the ground stress evolution data of the test point can be obtained.
- the direction cosine of any two working faces between the two three-way pressure boxes mentioned above shall not be 1, which means that the normal directions of any two working faces between the two three-way pressure boxes are not coincident, or Not parallel.
- the invention also substantially provides an in-situ stress measuring device, comprising a connecting rod, two three-way pressure boxes are fixed adjacent to the connecting rod; the three-way pressure box has three working faces perpendicular to each other, two The direction cosine of any two working faces between the three-way pressure boxes is not 1; two working devices on the three three-way pressure box are equipped with a device for measuring normal compressive stress, which passes through the data line and the outside of the borehole. The reader is connected.
- the apparatus for measuring the normal compressive stress installed on each working surface of the two three-way pressure boxes may be any equipment known in the art, such as those provided by the background art, and may also be a well-known vibration in the field of measuring instruments.
- the string structure comprises a steel elastic diaphragm on the working surface, two steel cylinders are fixed under the steel elastic diaphragm, a steel string is fixed between the two cylinders, a coil is arranged on the steel string, and the coil is connected Data line.
- It can also be a resistance strain type structure. Including the elastic diaphragm on the working surface, under the elastic diaphragm The central fixed fixed strain gauge, and the strain gauge is connected to the reader through the data line.
- two three-way pressure boxes are adjacently fixed to the connecting rods, and the two three-way pressure boxes are a set of three-way pressure boxes.
- multiple sets of three-way pressure boxes can be connected to the connecting rod, so that the ground stress can be measured for multiple test points at the same time.
- the connecting rod may be hollow, and the data line is connected via a cavity of the connecting rod and a reader outside the bore.
- the principle of the ground stress test principle is described as follows:
- the two three-way pressure boxes are respectively recorded as A and B, and the space coordinate system ojc is established in the normal direction of the working direction of the three-way pressure box A; the normal direction of the three-way pressure box B working surface is established as the coordinate axis direction.
- the space coordinate system oxj is shown in Figure 2.
- the normal pressure data measured by the three-way pressure box A is set to ⁇ ⁇ , ⁇ ⁇ , ⁇ ⁇ ; the normal pressure data measured by the three-way pressure box ⁇ is set to ⁇ ;; ⁇ ; ⁇ ⁇ ' -, and is set , / 2 , / 3 are the cosines of the direction between x', y ⁇ 'axis and the x-axis; ⁇ m 2 and 3 are the cosines of the direction between x, yz and _y, respectively; n 2 , n 3 is the cosine of the direction between the x, y z' axis and the z axis, respectively.
- a three-way pressure box is placed in the borehole. After the grouting is solidified, the pressure inside the soft rock mass is transferred to the working surface of the three-way pressure box through the grouting material, so that the measurement of the internal compressive stress of the soft rock mass is realized.
- the grouting material can be made of concrete mortar.
- the invention has the following advantages and beneficial effects: 1 It can directly measure the ground stress value of a certain test point in deep soft rock, which is beneficial to the study of surrounding rock stability; 2 Because the external measurement of the wire is adopted, the measurement can be conveniently obtained in real time. Value, easy to implement on site. 3 Long-term monitoring of surrounding rock stress can be carried out.
- Figure 1 is a schematic view showing the structure of a soft rock ground stress measuring device.
- Figure 2 is a schematic diagram of the coordinate system of the soft rock ground stress measurement method.
- Figure 3 is a schematic diagram of a three-way pressure box vibrating wire pressure test device
- Figure 4 is a schematic diagram of a three-way pressure box resistance strain type pressure test device
- the invention discloses an in-situ stress measuring device, comprising a connecting rod 3, two three-way pressure boxes 1, 2 are fixed adjacent to the connecting rod 3; the three-way pressure boxes 1, 2 have three perpendicular to each other Working face, the direction cosine of any two working faces between two three-way pressure boxes is not 1; two three-way pressure boxes are equipped with devices for measuring normal compressive stress on each working surface, the device passes the data line 4 Connect to the reader 5 outside the borehole.
- the method for testing the in-situ stress of soft rock using the above device includes the following steps:
- the three-way pressure box 1 and the three-way pressure box 2 may be in the shape of a rectangular parallelepiped, and each of the end faces may be subjected to pressure deformation, and the pressure applied to the end faces by the external measuring device 5 may be measured.
- the three-way pressure box 1, 2 is a square body, the edge is made of high-strength steel, and the end surface is a deformable steel elastic diaphragm 9, as shown in FIG. 3, below the elastic diaphragm 9 (ie, The inner side of the three-way pressure box 1, 2 is fixed with two steel cylinders 6, a steel string 7 is fixed between the two steel cylinders 6, a coil 8 is sleeved on the steel string 7, and the coil 8 is connected to the wire 4. Wire 4 is connected to reader 5.
- the structure is a vibrating wire structure well known in the field of measuring instruments.
- the column 6 When the elastic diaphragm 9 is subjected to pressure bending, the column 6 is displaced, so that the steel string 7 is elongated or shortened, and the natural frequency is changed.
- the reader 5 is a frequency meter. By measuring the natural frequency of the steel string 7, the deformation amount of the elastic diaphragm 9 is obtained, thereby obtaining the pressure applied to the end face of the three-way pressure box by comparing the previously-calibrated pressure-frequency data curve. .
- the three-way pressure boxes 1 and 2 are square bodies, and the edges thereof are made of high-strength steel, and the end faces are
- a resistive strain gauge 11 is fixed at the center of the elastic diaphragm 10 (i.e., the inner side of the three-way pressure cell 1).
- the strain gauge 11 is connected to the reader 5 via a data line 4.
- the strain gauge 11 is well known in the art of measuring instruments. When the elastic diaphragm 10 is subjected to pressure bending, the strain gauge 11 is elongated or shortened to change its electrical resistance.
- the reader 5 is an ammeter. By measuring the resistance of the strain gauge 11, the deformation amount of the elastic diaphragm 10 is obtained, and the pressure applied to the end face of the three-way pressure cell is calculated by a previously calibrated data curve.
- Example 3 Three geodesic stress tests performed at the Pingdingshan No. 1 Mine using the method of the present invention.
- the test process is as follows: Drill holes to the side wall of the main roadway to a depth of about 10 meters, push the connecting rods with two three-direction stress boxes to the bottom of the hole, and the vibrating wire pressure is used for the measurement part of the three-way pressure box.
- the wires are connected to the frequency meter outside the borehole through the inside of the connecting rod. Seal the hole and fill it with the concrete mortar of M25. After 24 hours, the grouted slurry solidified, and the pressure value was read every 1 hour from the frequency meter.
- the six pressure data measured by the two three-way pressure boxes were substituted into the ground stress test.
- the equation is solved to obtain the state of the ground stress at the test point.
- the test results of the three test points implemented in the -517 Shimen maintenance roadway and the three-level main transportation lane are shown in the following table.
- the maximum principal stress, intermediate principal stress and minimum principal stress (shear stress is 0) are obtained by the ground stress calculation formula.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013243049A AU2013243049A1 (en) | 2012-04-05 | 2013-05-16 | Deep softrock geostress test method and device based on flow stress recovery principle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2012100966446A CN102628716B (zh) | 2012-04-05 | 2012-04-05 | 基于流变应力恢复原理的深部软岩地应力测试方法和装置 |
CN201210096644.6 | 2012-04-05 |
Publications (1)
Publication Number | Publication Date |
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WO2013149599A1 true WO2013149599A1 (zh) | 2013-10-10 |
Family
ID=46587016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/CN2013/075686 WO2013149599A1 (zh) | 2012-04-05 | 2013-05-16 | 基于流变应力恢复原理的深部软岩地应力测试方法和装置 |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN102628716B (zh) |
AU (2) | AU2013243049A1 (zh) |
WO (1) | WO2013149599A1 (zh) |
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CA2062542C (en) * | 1992-03-09 | 1996-01-16 | Harald Kanduth | Method and apparatus for measuring three dimensional stress in rock surrounding a borehole |
-
2012
- 2012-04-05 CN CN2012100966446A patent/CN102628716B/zh not_active Expired - Fee Related
-
2013
- 2013-05-16 AU AU2013243049A patent/AU2013243049A1/en active Pending
- 2013-05-16 AU AU2013101531A patent/AU2013101531A4/en not_active Expired
- 2013-05-16 WO PCT/CN2013/075686 patent/WO2013149599A1/zh active Application Filing
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SU1171676A1 (ru) * | 1984-05-14 | 1985-08-07 | Новосибирский государственный университет им.Ленинского комсомола | Устройство дл измерени давлени горных пород в скважинах |
CN86201683U (zh) * | 1986-03-29 | 1987-03-25 | 核工业部第七研究所 | 高精度岩石应力仪 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113090211A (zh) * | 2021-04-20 | 2021-07-09 | 中国地质科学院勘探技术研究所 | 一种破碎地层岩心保护装置 |
KR20230052148A (ko) * | 2021-10-12 | 2023-04-19 | 경상국립대학교산학협력단 | 불안정성 인덱스를 이용한 유동 응력과 소성가공 공정 분석 및 평가 방법 |
KR102548622B1 (ko) | 2021-10-12 | 2023-06-29 | 경상국립대학교산학협력단 | 불안정성 인덱스를 이용한 유동 응력과 소성가공 공정 분석 및 평가 방법 |
Also Published As
Publication number | Publication date |
---|---|
CN102628716A (zh) | 2012-08-08 |
AU2013101531A4 (en) | 2014-01-09 |
CN102628716B (zh) | 2013-02-13 |
AU2013243049A1 (en) | 2013-11-21 |
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