CN107796551B - Indoor experiment platform of local wall stress relief method instrument and measurement method thereof - Google Patents
Indoor experiment platform of local wall stress relief method instrument and measurement method thereof Download PDFInfo
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- CN107796551B CN107796551B CN201711240807.2A CN201711240807A CN107796551B CN 107796551 B CN107796551 B CN 107796551B CN 201711240807 A CN201711240807 A CN 201711240807A CN 107796551 B CN107796551 B CN 107796551B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000002474 experimental method Methods 0.000 title claims abstract description 10
- 238000000691 measurement method Methods 0.000 title abstract description 4
- 239000011435 rock Substances 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 238000010205 computational analysis Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 238000011326 mechanical measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
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Abstract
The invention discloses a local wall stress relief method instrument indoor experiment platform and a measurement method thereof, wherein the local wall stress relief method instrument indoor experiment platform comprises a base and a frame vertically fixed on the base, a first balance cushion block is fixed on the inner top wall of the frame, a jack is fixed on the inner bottom wall of the frame, a second balance cushion block is fixed on the upper end of the jack, a rock mass to be measured is clamped through the first balance cushion block and the second balance cushion block, a sleeve arranged in a vertical mode is also detachably fixed on the side wall of the frame, a through hole is formed in the side wall of the sleeve, the through hole corresponds to the position of the rock mass to be measured, and a ground stress robot device is arranged in the sleeve; the device and the method can ensure that the ground stress measurement of the measuring point is completed in a relatively smaller rock mass range, avoid the influence of heterogeneous elements due to the rock mass property on a measurement result, and improve the reliability of a test result.
Description
Technical Field
The invention relates to the technical field of geotechnical mechanical measurement, in particular to an instrument room experiment platform for a local wall stress relief method and a method for measuring the stress relief method of a local wall of a drilled hole.
Background
Shale gas is a rich, clean and efficient unconventional natural gas resource. Aiming at the current situation that the scale breakthrough in the area is not achieved in the current shale gas exploration and development, the technological attack and investigation demonstration is developed, the important breakthrough in the multi-field and multi-type shale gas exploration and development is promoted, the shale gas reserves are promoted to be ascertained and the productivity is promoted to be constructed, and the resource foundation and the technical guarantee are provided for completing the national shale gas planning target. Not only is closely related to shale gas exploitation, but also the deep ground stress measurement and research, the development of a novel method and a novel technology for vertical deep drilling ground stress measurement and the development of a novel instrument and the long-term monitoring of ground stress are extremely important research subjects in the aspects of researching seismology, earthquake occurrence mechanism and earthquake prediction. Therefore, researching the initial stress state of the rock mass at the parts on the upper layer of the crust, developing a special device for the ground stress logging with independent intellectual property rights and the forefront principle and capable of being used for vertical deep drilling is really an urgent need of the country, and is also a need for achieving the world leading ambitious goal in pursuing the measurement of the ground stress of the deep drilling.
One of the important characteristics of rock medium, which is different from other materials, is that internal stress is exerted in the rock medium, which is mainly caused by the dead weight of the rock mass and the structural stress of the earth crust historically caused and remained to date and other factors. The ground stress is a collective term for the internal stress existing in the rock mass, and such mechanical state of the engineering rock mass is not only objectively existing, but also the size and direction thereof are different from place to place. The ground stress measurement and research and application thereof are performed in rock engineering design and stability evaluation work in various fields such as water conservancy and hydropower, mining engineering, oil and gas resource exploitation, traffic industry and the like, so to speak, the ground stress is one of essential basic data materials for rock mechanics and engineering design and computational analysis. The research of the original place initial ground stress state measuring method and the related testing technology which are not influenced by the engineering disturbance area at home and abroad has over 80 years, among the proposed ground stress measuring methods, the application of the drilling stress relieving method in the rock mechanics and engineering fields is most common, and the testing technology is relatively mature and perfect. Nevertheless, the stress measurement method itself of the drilling stress relief method has certain limitations in practical application, especially in three-dimensional stress measurement.
Disclosure of Invention
The invention aims to provide an indoor experimental platform of a local wall stress relief method instrument and a method for measuring the drilling local wall stress relief method, which can ensure that the ground stress measurement of a measuring point is completed in a relatively small rock mass range, avoid the influence of heterogeneous elements due to the rock mass property on a measurement result and improve the reliability of a test result.
In order to achieve the above purpose, the invention provides a laboratory platform of a local wall stress relief method instrument room, which comprises a base and a frame vertically fixed on the base, wherein a first balance cushion block is fixed on the inner top wall of the frame, a jack is fixed on the inner bottom wall of the frame, a second balance cushion block is fixed on the upper end of the jack, a rock mass to be tested is clamped by the first balance cushion block and the second balance cushion block, a sleeve arranged in a vertical mode is also detachably fixed on the side wall of the frame, a through hole is arranged on the side wall of the sleeve, the through hole corresponds to the position of the rock mass to be tested, and a ground stress robot device is arranged in the sleeve.
Preferably, the frame comprises two longitudinal beams vertically fixed on the base respectively, the upper ends of the two longitudinal beams and the lower ends of the two longitudinal beams are connected through cross beams respectively, the first balance cushion block is fixed on the lower surface of the cross beam above, and the jack is fixed on the upper surface of the cross beam below.
Preferably, a bracket arranged along the horizontal direction is detachably fixed on the longitudinal beam, a bracket is fixed at the lower end of the sleeve, and the bracket is detachably fixed on the bracket.
Preferably, the bracket and the longitudinal beam are connected through screws, and the bracket are connected through screws.
Preferably, a plurality of threaded holes are formed in the surface of the longitudinal beam from top to bottom, and the bracket is fixed to the threaded holes through screws.
Preferably, the first balance cushion block is of a rectangular block structure, and the second balance cushion block is composed of a rectangular block structure and a cylinder which are sequentially connected from top to bottom.
The invention also provides a method for measuring the stress relief method of the local wall surface of the drill hole by using the indoor experimental platform of the instrument for relieving the stress of the local wall surface, which comprises the following steps:
1) Placing the ground stress robot equipment into a sleeve, placing the rock mass to be measured between a first balance cushion block and a second balance cushion block, and clamping by a jack;
2) Grinding the side edges of the rock mass to be measured through the ground stress robot equipment;
3) Selecting a round surface with the diameter of 30-40mm on the side edge of the rock mass to be measured after being ground, and bonding four-component strain clusters on the round surface, wherein the strain sheets of each four-component strain cluster form an angle of 45 degrees with each other;
4) After the four-component strain clusters are solidified, performing circular cutting drilling operation along the circular surface by using a ground stress robot device, wherein the depth of drilling is 40-60mm, and recording data by using a strain gauge connected with the four-component strain clusters;
5) And stopping the circular cutting drilling operation after the wall surface of the hole wall deforms stably, arranging 1-2 groups of strain clusters on the side wall of the hole bottom of the drilled hole, and recording data by using a strain gauge connected with the strain clusters.
Preferably, in the step (5), when the strain clusters arranged on the side wall of the hole bottom of the drilled hole are 2 groups, the included angle between the 2 groups of strain clusters and the axis of the drilled hole is 110-130 degrees.
According to the technical scheme, the invention provides a local wall stress relief method instrument indoor experiment platform and a method for measuring drilling local wall stress relief method, wherein the local wall stress relief method instrument indoor experiment platform comprises a base and a frame vertically fixed on the base, a first balance cushion block is fixed on the inner top wall of the frame, a jack is fixed on the inner bottom wall of the frame, a second balance cushion block is fixed on the upper end of the jack, a rock mass to be measured is clamped through the first balance cushion block and the second balance cushion block, a sleeve arranged in a vertical mode is also detachably fixed on the side wall of the frame, a through hole is arranged on the side wall of the sleeve, the through hole corresponds to the position of the rock mass to be measured, and a ground stress robot device is arranged in the sleeve; the device is provided with a hole in the side wall, communicated with the hole in the sleeve, and the mechanical arm extending out of the hole can finish the work of pasting the strain gauge and coring the experimental test block. The device and the method can ensure that the ground stress measurement of the measuring point is completed in a relatively smaller rock mass range, avoid the influence of heterogeneous elements due to the rock mass property on a measurement result, and improve the reliability of a test result.
Other features and advantages of the invention:
1. the method enables the process of testing the ground stress by the ground stress robot equipment to be conveniently and intuitively demonstrated in a small indoor space.
2. The method uses the jack to press on the test block to simulate the stress condition of underground surrounding rock, and fully utilizes the advantages of short core and easy implementation of the stress removed rock.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a first state structure diagram of an instrument room experiment platform for partial wall stress relief in accordance with the present invention;
fig. 2 is a second state structure diagram of an indoor experimental platform of a local wall stress relieving method instrument provided by the invention.
The reference numerals are explained as follows:
1-sleeve 2-bracket
3-support 4-base
5-frame 6-first balance pad.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the present invention, unless otherwise indicated, directional terms such as "vertical method, horizontal direction" and the like are merely terms representing the orientation of the term in a conventional use state or are commonly understood by those skilled in the art, and should not be construed as limiting the term.
As shown in fig. 1 and 2: the invention provides a local wall stress relief method instrument indoor experiment platform which comprises a base 4 and a frame 5 vertically fixed on the base 4, wherein a first balance cushion block 6 is fixed on the inner top wall of the frame 5, a jack is fixed on the inner bottom wall of the frame 5, a second balance cushion block is fixed on the upper end of the jack, a rock mass to be tested is clamped through the first balance cushion block 6 and the second balance cushion block, a sleeve 1 arranged in a vertical mode is also detachably fixed on the side wall of the frame 5, a through hole is formed in the side wall of the sleeve 1, the through hole corresponds to the position of the rock mass to be tested, and a ground stress robot device is arranged in the sleeve 1. The device and the method can ensure that the ground stress measurement of the measuring point is completed in a relatively smaller rock mass range, avoid the influence of heterogeneous elements due to the rock mass property on a measurement result, and improve the reliability of a test result.
In a preferred embodiment of the present invention, in order to better fix the rock mass to be measured and improve accuracy of measurement results, the frame 5 includes two stringers vertically fixed to the base 4, upper ends of the two stringers and lower ends of the two stringers are connected by a cross beam, respectively, the first balance pad 6 is fixed to a lower surface of the cross beam located above, and the jack is fixed to an upper surface of the cross beam located below.
In a preferred embodiment of the invention, in order to better fix the rock mass to be measured and improve the accuracy of the measurement result, a bracket 3 arranged along the horizontal direction is detachably fixed on the longitudinal beam, a bracket 2 is fixed at the lower end of the sleeve 1, and the bracket 2 is detachably fixed on the bracket 3.
In a preferred embodiment of the invention, the brackets 3 and stringers are screwed together and the brackets 2 and brackets 3 are screwed together in order to facilitate the assembly and disassembly of the sleeve 1.
In a preferred embodiment of the invention, in order to facilitate the positioning of the sleeve 1 relative to the frame 5 and the measurement of the rock mass, the stringer surface is provided with a plurality of threaded holes from top to bottom, and the bracket 3 is secured to the threaded holes by screws.
In a preferred embodiment of the present invention, in order to better fix the rock mass to be measured and improve the accuracy of the measurement result, the first balance pad 6 has a rectangular block structure, and the second balance pad is composed of a rectangular block structure and a cylinder sequentially connected from top to bottom.
The invention also provides a method for measuring the stress relief method of the local wall surface of the drill hole by using the indoor experimental platform of the instrument for relieving the stress of the local wall surface, which comprises the following steps:
1. placing the ground stress robot equipment into a sleeve 1 (the diameter of the sleeve is 168 mm), placing a rock mass to be tested (the rock mass to be tested is selected to be a flat square marble test block) between a first balance cushion block 6 and a second balance cushion block, and clamping the rock mass to be tested by a jack;
2. grinding the side edge of the rock mass to be measured by a manipulator extending out of the side wall opening of the ground stress robot equipment;
3. selecting a round surface with the diameter of 30-40mm on the side edge of the rock mass to be measured after being ground, and bonding four-component strain clusters on the round surface, wherein the strain sheets of each four-component strain cluster form an angle of 45 degrees with each other;
4. after the four-component strain clusters are consolidated, performing circular cutting drilling operation (stress relief operation) along the circular surface by using a ground stress robot device, wherein the depth of drilling is 40-60mm, and performing data recording (obtaining positive strain change values in at least four different directions) by using a strain gauge connected with the four-component strain clusters;
5. after the deformation of the wall surface of the hole wall is stable, the circular cutting drilling operation is stopped, 1-2 groups of strain clusters are arranged on the side wall of the hole bottom of the drill hole (when the strain clusters arranged on the side wall of the hole bottom of the drill hole are 2 groups, the included angle between the 2 groups of strain clusters and the axis of the drill hole is 110-130 degrees), and data recording is carried out through strain gauges connected with the strain clusters (two groups of eight positive strain values of the hole wall in different directions are obtained, and the measuring precision of the stress of the hole bottom is improved by adding the strain measuring value of the hole bottom). After the measurement is completed, according to positive strain change values in different directions obtained by the stress relief operation of the side wall surface, a linear equation set consisting of at least six independent equations is obtained, the elastic modulus and the poisson ratio of the rock material of the measuring point are known, six ground stress components of the measuring point are obtained through the least square method, and the three-dimensional ground stress of the measuring point is obtained.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (4)
1. The indoor experiment platform of the local wall stress relief method instrument is characterized by comprising a base (4) and a frame (5) vertically fixed on the base (4), wherein a first balance cushion block (6) is fixed on the inner top wall of the frame (5), a jack is fixed on the inner bottom wall of the frame (5), a second balance cushion block is fixed on the upper end of the jack, a rock mass to be measured is clamped through the first balance cushion block (6) and the second balance cushion block, a sleeve (1) arranged in a vertical mode is also detachably fixed on the side wall of the frame (5), a through hole is formed in the side wall of the sleeve (1), the through hole corresponds to the position of the rock mass to be measured, and a ground stress robot device is arranged in the sleeve (1);
the frame (5) comprises two longitudinal beams which are respectively and vertically fixed on the base (4), the upper ends of the two longitudinal beams are respectively connected with the lower ends of the two longitudinal beams through cross beams, the first balance cushion block (6) is fixed on the lower surface of the cross beam positioned above, and the jack is fixed on the upper surface of the cross beam positioned below; a bracket (3) arranged along the horizontal direction is detachably fixed on the longitudinal beam, a bracket (2) is fixed at the lower end of the sleeve (1), and the bracket (2) is detachably fixed on the bracket (3);
the method for measuring the stress relief method of the local wall surface of the drill hole by adopting the experimental platform in the instrument room for relieving the stress of the local wall surface comprises the following steps:
1) Placing the ground stress robot equipment into a sleeve, placing the rock mass to be measured between a first balance cushion block (6) and a second balance cushion block, and clamping by a jack;
2) Grinding the side edge of the rock mass to be measured through a manipulator extending out of the side wall opening of the ground stress robot equipment;
3) Selecting a round surface with the diameter of 30-40mm on the side edge of the rock mass to be measured after being ground, and bonding four-component strain clusters on the round surface, wherein the strain sheets of each four-component strain cluster form an angle of 45 degrees with each other;
4) After the four-component strain clusters are consolidated, performing circular cutting drilling operation along the circular surface by using a ground stress robot device, performing stress relief, wherein the depth of the drilled hole is 40-60mm, and performing data recording by using a strain gauge connected with the four-component strain clusters to obtain positive strain change values in at least four different directions;
5) After the deformation of the wall surface of the hole wall is stable, the circular cutting drilling operation is stopped, 2 groups of strain clusters are arranged on the side wall of the hole bottom of the drilled hole, the included angle between the axes of the drilled hole and the 2 groups of strain clusters is 110-130 degrees, data recording is carried out through strain gauges connected with the strain clusters, two groups of eight hole wall positive strain values in different directions are obtained, the hole bottom strain measurement value is added, the measurement precision of the three-dimensional ground stress is improved, after the measurement is completed, a linear equation set consisting of at least six independent equations is obtained according to the positive strain change values in different directions obtained by the stress relief operation of the wall surface of the side wall, the elastic modulus and the poisson ratio of the rock material of the measuring point are known, six ground stress components of the measuring point are obtained through a least square method, and the three-dimensional ground stress of the measuring point is obtained.
2. The laboratory bench of a local wall stress relief method instrument room according to claim 1, characterized in that the brackets (3) and the stringers are connected by screws, and the brackets (2) and the brackets (3) are connected by screws.
3. The laboratory bench of a local wall stress relief method instrument room according to claim 1, characterized in that the stringer surface is provided with a plurality of threaded holes from top to bottom, on which the brackets (3) are screwed.
4. The laboratory bench of a local wall stress relief method instrument room according to claim 1, characterized in that the first balancing pad (6) is of rectangular block structure, and the second balancing pad is composed of rectangular block structure and cylinder connected in sequence from top to bottom.
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| CN201711240807.2A CN107796551B (en) | 2017-11-30 | 2017-11-30 | Indoor experiment platform of local wall stress relief method instrument and measurement method thereof |
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| CN107796551B true CN107796551B (en) | 2024-01-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108414129B (en) * | 2018-04-02 | 2023-07-14 | 长江水利委员会长江科学院 | Device and method for testing relief of direct patch ground stress of semi-enclosure |
| CN108547613B (en) * | 2018-06-13 | 2023-09-15 | 中国科学院武汉岩土力学研究所 | Device for measuring three-dimensional ground stress of deep rock mass |
| CN115184171B (en) * | 2022-07-06 | 2024-06-11 | 中国科学院武汉岩土力学研究所 | In-situ rock mass modulus measurement system and method |
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