CN113758611A - Disturbance stress test sensor considering rigid rotary displacement - Google Patents
Disturbance stress test sensor considering rigid rotary displacement Download PDFInfo
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- CN113758611A CN113758611A CN202110925165.XA CN202110925165A CN113758611A CN 113758611 A CN113758611 A CN 113758611A CN 202110925165 A CN202110925165 A CN 202110925165A CN 113758611 A CN113758611 A CN 113758611A
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- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 87
- 238000009662 stress testing Methods 0.000 claims description 11
- 239000011435 rock Substances 0.000 abstract description 33
- 238000000034 method Methods 0.000 abstract description 27
- 230000007547 defect Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- 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
Abstract
The invention discloses a disturbance stress test sensor considering rigid rotary displacement. The strain gauge comprises a hollowed-out strain measuring frame, an angle measuring system, a strain measuring system and a sensor filling body; the angle measuring system is positioned in the hollowed-out strain measuring frame; the strain measurement system is arranged on the outer wall of the hollowed-out strain measurement frame; the sensor filling body is arranged on the periphery of the hollowed-out strain measurement frame and located on the outer side of the strain measurement system. The invention overcomes the defect that disturbance stress test is inaccurate because the displacement or rotation of the sensor along with surrounding rocks under the condition of large deformation of weak surrounding rocks is not considered; the method has the advantages of considering the displacement and rotation of the sensor in the deformation process of the surrounding rock, accurately testing the disturbance stress and expanding the geological applicability.
Description
Technical Field
The invention relates to the technical field of geotechnical measurement, in particular to a disturbance stress test sensor considering rigid rotational displacement.
Background
The existing disturbance stress testing method is mainly suitable for measuring hard formation conditions, and for weak geological conditions which are easy to deform greatly, such as coal mines, side slopes, foundation pits and the like, the sensor cannot be guaranteed to be always kept at an initial space coordinate position in the measuring process, can displace and rotate along with the deformation of surrounding rocks, and can deform under the action of ground stress (as shown in figures 1 and 2). For example, the application number CN201810599551.2, the patent name "unit body method and device for measuring disturbance stress" proposes a method and device for measuring disturbance stress based on unit stress analysis, the measurement principle is that the strain of the sensor during the deformation process of the applied force is measured, the external force applied to the sensor is obtained by inverse calculation according to the elastic mechanics solution of the unit body, and then the distribution of disturbance stress is obtained by the strain variation; however, the test method does not consider the situation that the sensor displaces or rotates along with the surrounding rock under the condition of large deformation of the weak surrounding rock, and also does not consider the sensor rotation possibly caused in the deformation process of the surrounding rock, so that the disturbance stress test is inaccurate.
Therefore, it is necessary to develop a disturbance stress test sensor which is accurate in disturbance stress test and can adapt to the weak and large-deformation formation conditions.
Disclosure of Invention
The invention aims to provide a disturbance stress test sensor considering rigid rotary displacement, which considers the displacement and rotation of the sensor in the deformation process of surrounding rock, can adapt to the weak and large-deformation stratum conditions, is more accurate in disturbance stress test and can enlarge the geological applicability.
In order to achieve the purpose, the technical scheme of the invention is as follows: a disturbance stress test sensor considering rigid rotational displacement is characterized in that: the strain gauge comprises a hollowed-out strain measuring frame, an angle measuring system, a strain measuring system and a sensor filling body;
the angle measuring system is positioned in the hollowed-out strain measuring frame;
the strain measurement system is arranged on the outer wall of the hollowed-out strain measurement frame;
the sensor filling body is arranged on the periphery of the hollowed-out strain measurement frame and located on the outer side of the strain measurement system.
In the technical scheme, the outline of the hollowed-out strain measurement frame is in a special-shaped octahedron shape;
the hollow-out strain measurement frame is internally provided with a cavity, and the outer wall of the hollow-out strain measurement frame is provided with an octahedral prism surface.
In the technical scheme, the angle measuring system is arranged in the cavity;
the strain measurement system is installed on the octahedral prism surface.
In the technical scheme, the sensor filling body is a regular hexahedron; the sensor filling body is wrapped on the periphery of the hollowed-out strain measurement frame.
In the above technical scheme, the hollowed-out strain measurement frame is located in the center of the sensor filling body.
In the technical scheme, an octahedral top square plane is arranged on the outer wall of the hollowed-out strain measurement frame; a plurality of octahedral edges are connected through a square plane at the top of the octahedron;
the outer wall of the sensor filling body is provided with a hexahedral plane;
the square plane at the top of the octahedron and the hexahedron plane are arranged in parallel.
In the technical scheme, the sensor filling body is provided with the rounding structure.
The invention has the following advantages:
(1) the invention considers the displacement and rotation of the sensor, can adapt to the weak and large deformation stratum conditions, improves the disturbance stress testing accuracy, and has guiding significance for enlarging the geological application range of the sensor;
(2) the disturbance stress test is more accurate, and the geological applicability of the test is enlarged.
Drawings
FIG. 1 is a schematic structural diagram of a disturbance stress test sensor arranged in a surrounding rock borehole under a surrounding rock undeformed condition.
Fig. 2 is a schematic structural diagram of a disturbance stress test sensor arranged in a surrounding rock borehole and displaced or rotated along with the surrounding rock when the surrounding rock is deformed.
Fig. 3 is a schematic view of a connection structure of the hollowed-out strain measurement frame, the angle measurement system and the strain measurement system in the present invention.
Fig. 4 is a perspective structure diagram of the present invention.
In fig. 1, a1 denotes a disturbance stress test sensor disposed in a surrounding rock borehole; b1 denotes a surrounding rock.
In fig. 2, a1 represents a disturbance stress test sensor provided in a surrounding rock borehole before deformation of the surrounding rock; b1 represents the surrounding rock before deformation;
a2 represents a disturbance stress test sensor arranged in a surrounding rock drill hole after the surrounding rock deforms; b2 represents the deformed surrounding rock.
X, y, and z in fig. 3 and 4 are three-dimensional coordinate systems.
In the figure, 1-hollowed-out strain measurement frame, 1.1-cavity, 1.2-octahedral prism surface, 1.3-octahedral top square plane, 1.3A-first square plane, 1.3B-second square plane, 1.3C-third square plane, 1.3D-fourth square plane, 2-angle measurement system, 3-strain measurement system, 4-sensor filling body, 4.1-hexahedral plane, 4.1A-first plane, 4.1B-second plane, 4.1C-third plane, 4.1D-fourth plane, and 4.2-fillet structure.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.
With reference to the accompanying drawings: a disturbance stress test sensor considering rigid rotational displacement comprises a hollow-out type strain measurement frame 1, an angle measurement system 2, a strain measurement system 3 and a sensor filling body 4;
the angle measuring system 2 is positioned in the hollow-out type strain measuring frame 1;
the strain measurement system 3 is arranged on the outer wall of the hollowed-out strain measurement frame 1;
the sensor filling body 4 is arranged on the periphery of the hollowed-out strain measurement frame 1 and located outside the strain measurement system 3 (as shown in figures 3 and 4), displacement and rotation of the sensor in the deformation process of the surrounding rock are considered, disturbance stress testing is more accurate, the sensor filling body can adapt to the geology of the weak and large deformation stratum condition and the geology of the hard stratum condition, and the geological applicability of the disturbance stress testing sensor is expanded.
Further, the outline of the hollowed-out strain measurement frame 1 is shaped like a special octahedron; the irregular octahedron refers to an octahedron with an outer contour of which the edge is turned flat. The invention adopts the special-shaped octahedron to ensure that the direction of strain measurement is fixed, and the strain is measured in the direction of the prism surface, so that the subsequent stress back calculation is more convenient.
A cavity 1.1 is arranged in the hollowed-out strain measurement frame 1, and an octahedral prism surface 1.2 is arranged on the outer wall (as shown in figure 3); the cavity 1.1 is used for installing the angle measuring system 2, the octahedral prism surface 1.2 is used for installing the strain measuring system 3, and the displacement and rotation of the sensor in the deformation process of the surrounding rock are considered, so that the disturbance stress testing accuracy is improved.
According to the invention, the angle measurement system 2 is integrated in the hollowed-out strain measurement frame 1, the displacement and rotation conditions of the strain measurement system are measured through the angle measurement system 2, the strain measurement system 3 is integrated on the outer wall (namely the octahedral prism surface 1.2) of the hollowed-out strain measurement frame 1, the disturbance stress is measured through the octahedral prism surface 1.2, the hollowed-out strain measurement frame 1, the angle measurement system 2 and the strain measurement system 3 are wrapped inside the sensor filling body 4 as a whole, the size is reduced, the hollowed-out strain measurement frame 1, the angle measurement system 2 and the strain measurement system 3 are effectively protected, and the measurement accuracy is ensured.
Further, an angle measuring system 2 is mounted in the cavity 1.1; the angle measurement system 2 is used for measuring the displacement and rotation conditions of the disturbance stress test sensor considering rigid rotary displacement;
the strain measurement system 3 is arranged on an octahedral facet 1.2 (as shown in fig. 3), the surface of the facet is flat, and the strain measurement element is arranged on the flat facet, so that the strain measurement system is convenient to install and is ensured to be tightly connected with the strain measurement element; the strain measurement system 3 is used for measuring the disturbance stress of the measurement point where the disturbance stress test sensor is located.
Furthermore, the sensor filling body 4 is a regular hexahedron, and the sensor filling body 4 in the regular hexahedron shape is used as a stress unit, so that the ground stress back calculation is convenient to carry out; the sensor filling body 4 is wrapped on the periphery of the hollowed-out strain measurement frame 1 (as shown in fig. 4).
Furthermore, the hollowed-out strain measurement frame 1 is located in the center of the sensor filling body 4, so that local stress concentration in the test process is weakened, the stress uniformity of the sensor is ensured, and the accuracy of a disturbance stress test result is improved.
Furthermore, an octahedral top square plane 1.3 is arranged on the outer wall of the hollowed-out strain measurement frame 1; a plurality of octahedral facets 1.2 are connected through an octahedral top square plane 1.3;
the outer wall of the sensor filling body 4 is provided with a hexahedral plane 4.1;
the square plane 1.3 at the top of the octahedron and the hexahedron plane 4.1 are arranged in parallel (as shown in figure 4), so that the local stress concentration in the test process is weakened, the stress uniformity of the sensor is ensured, and the accuracy of a disturbance stress test result is improved.
In order to weaken the local stress concentration in the test process, ensure the stress uniformity of the sensor and improve the accuracy of a disturbance stress test result, a square plane 1.3 at the top of each octahedron and a corresponding hexahedron plane 4.1 are arranged in parallel, and the method specifically comprises the following steps:
the octahedral top square plane 1.3 includes a first square plane 1.3A, a second square plane 1.3B, a third square plane 1.3C, a fourth square plane 1.3D, a fifth square plane and a sixth square plane;
the six faces of the hexahedral plane 4.1 are respectively: a first plane 4.1A, a second plane 4.1B, a third plane 4.1C, a fourth plane 4.1D, a fifth plane and a sixth plane;
the first square plane 1.3A is positioned inside the first plane 4.1A and is parallel to the first plane 4.1A; the second square plane 1.3B is located inside the second plane 4.1B and is parallel to the second plane 4.1B; the third square plane 1.3C is located inside the third plane 4.1C and is parallel to the third plane 4.1C; the fourth square plane 1.3D is located inside the fourth plane 4.1D and is parallel to the fourth plane 4.1D; the fifth square plane is positioned on the inner side of the fifth plane and is parallel to the fifth plane; the sixth square plane is located inside the sixth plane and parallel to the sixth plane (as shown in fig. 4).
Furthermore, a fillet structure 4.2 (shown in fig. 4) is arranged on the sensor filling body 4, so that local stress concentration in the test process is weakened, and the stress uniformity of the sensor is ensured.
The prior patent application CN201810599551.2, entitled "unit body method and apparatus for measuring disturbance stress" is a patent application applied by the applicant of the present application on 11/06/2018, and the applicant finds in subsequent studies that, in the application of the patent application CN201810599551.2, entitled "unit body method and apparatus for measuring disturbance stress" to the measurement process of geology under the condition of weak and large-deformation formation, the situation that the sensor displaces or rotates along with the surrounding rock under the condition of weak and large-deformation formation is not considered, and the rotation of the sensor possibly caused in the deformation process of the surrounding rock is not considered, so that the disturbance stress test is inaccurate. The method aims to solve the problem that disturbance stress test is inaccurate when the method is applied to geology under the condition of weak and large-deformation stratum conditions due to the fact that a sensor displaces or rotates along with surrounding rocks under the condition of large deformation of the weak and small surrounding rocks is not considered in patent application CN201810599551.2 and the patent name 'unit body method and device for measuring disturbance stress'.
Examples
As shown in fig. 3 and 4, the disturbance stress test sensor considering rigid rotational displacement in the present embodiment is composed of four parts: the device comprises a hollow-out type strain measurement frame 1, an angle measurement system 2, a strain measurement system 3 and a sensor filling body 4. The sensor filling body 4 is arranged on the periphery of the hollowed-out strain measurement frame 1 and is positioned outside the strain measurement system 3.
The hollow-out type strain measurement frame 1 is internally provided with a cavity 1.1, and the angle measurement system 2 is arranged in the cavity 1.1.
The hollowed-out strain measurement frame 1 is provided with twelve octahedral facets 1.2 and six octahedral top square planes 1.3. The strain measuring system 3 is arranged on the octahedral facets 1.2.
The sensor filling body 4 is provided with six hexahedral planes 4.1, and a square plane 1.3 at the top of each octahedron is arranged in parallel with one hexahedral plane 4.1.
And rounded corner structures are arranged on twelve hexahedral edges of the sensor filling body 4.
In the embodiment, firstly, a hollowed-out strain measurement frame 1 is manufactured, the shape of the hollowed-out strain measurement frame 1 is a special-shaped octahedron, an angle measurement system 2 and a strain measurement system 3 are respectively installed in a cavity 1.1 inside the hollowed-out strain measurement frame 1 and on an octahedral prism surface 1.2, the data line fixing and sensing unit is well protected from the outside, then the hollowed-out strain measurement frame 1, the angle measurement system 2, the strain measurement system 3 and the data line fixing and sensing unit are poured into a regular hexahedron through a sensor filling body 4 (namely, the sensor filling body 4 wraps the periphery of the hollowed-out strain measurement frame 1), a disturbance stress test sensor whole is formed, and the disturbance stress test sensor is installed at a specified position of a surrounding rock drilling hole to perform disturbance stress test.
The hollow-out type strain measurement frame 1 and the sensor filling body 4 are made of the same material, and in the process of casting before and after the hollow-out type strain measurement frame 1 and the sensor filling body 4 are guaranteed to have good compatibility at the interface, the disturbance stress test sensor after casting is guaranteed to be a whole, and the disturbance stress test sensor can be coordinately deformed in the stress process. The pouring method is the prior art.
The angle measuring system 2 in the embodiment adopts the three-dimensional electronic compass to monitor the rotation angle of the sensor, so that the accuracy, the measuring range and the sensitivity of the angle measuring system can meet the monitoring requirement of the rotation angle of the sensor in the process of slow and large deformation of surrounding rock.
The disturbance stress test sensor considering rigid rotation displacement is applied to a foundation pit for disturbance stress test, the sensor can displace and rotate along with the deformation of surrounding rock, and the disturbance stress test of the embodiment is accurate.
The disturbance stress test sensor considering rigid rotary displacement is applied to a coal mine for disturbance stress test, the sensor can displace and rotate along with the deformation of surrounding rocks, and the disturbance stress test of the embodiment is accurate.
The disturbance stress test sensor considering rigid rotation displacement is applied to a side slope for disturbance stress test, the sensor can displace and rotate along with the deformation of surrounding rocks, and the disturbance stress test of the embodiment is accurate.
The disturbance stress test sensor considering rigid rotational displacement is applied to the hard rock for disturbance stress test, the sensor does not displace or rotate, and the disturbance stress test of the embodiment is accurate.
Other parts not described belong to the prior art.
Claims (7)
1. A disturbance stress test sensor considering rigid rotational displacement is characterized in that: the strain gauge comprises a hollow-out strain measuring frame (1), an angle measuring system (2), a strain measuring system (3) and a sensor filling body (4);
the angle measuring system (2) is positioned in the hollowed-out strain measuring frame (1);
the strain measurement system (3) is arranged on the outer wall of the hollowed-out strain measurement frame (1);
the sensor filling body (4) is arranged on the periphery of the hollowed-out strain measurement frame (1) and is positioned outside the strain measurement system (3).
2. The sensor for perturbed stress testing according to claim 1, wherein the sensor for perturbed stress considering rigid rotational displacement is characterized in that: the outline of the hollow-out strain measurement frame (1) is shaped like a special octahedron;
the hollow-out strain measurement frame (1) is internally provided with a cavity (1.1), and the outer wall of the hollow-out strain measurement frame is provided with an octahedral prism surface (1.2).
3. The sensor for perturbed stress testing according to claim 2, wherein the sensor for perturbed stress considering rigid rotational displacement is characterized in that: the angle measuring system (2) is arranged in the cavity (1.1);
the strain measurement system (3) is arranged on the octahedral prism surface (1.2).
4. The sensor for perturbed stress testing according to claim 3, wherein the sensor for perturbed stress considering rigid rotational displacement is characterized in that: the sensor filling body (4) is in a regular hexahedron shape; the sensor filling body (4) is wrapped on the periphery of the hollowed-out strain measurement frame (1).
5. The sensor for perturbed stress testing according to claim 4, wherein the sensor for perturbed stress considering rigid rotational displacement is characterized in that: the hollow-out type strain measurement frame (1) is located in the center of the sensor filling body (4).
6. The sensor for perturbed stress testing according to claim 5, wherein the sensor for perturbed stress considering rigid rotational displacement is characterized in that: an octahedral top square plane (1.3) is arranged on the outer wall of the hollowed-out strain measurement frame (1); a plurality of octahedral edges (1.2) are connected through an octahedral top square plane (1.3);
the outer wall of the sensor filling body (4) is provided with a hexahedral plane (4.1);
the square plane (1.3) at the top of the octahedron and the hexahedron plane (4.1) are arranged in parallel.
7. The sensor for perturbed stress testing according to claim 6, wherein the sensor for perturbed stress considering rigid rotational displacement is characterized in that: the sensor filling body (4) is provided with a fillet structure (4.2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110925165.XA CN113758611A (en) | 2021-08-12 | 2021-08-12 | Disturbance stress test sensor considering rigid rotary displacement |
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| CN202110925165.XA CN113758611A (en) | 2021-08-12 | 2021-08-12 | Disturbance stress test sensor considering rigid rotary displacement |
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| CN113758611A true CN113758611A (en) | 2021-12-07 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001099732A (en) * | 1999-09-30 | 2001-04-13 | National Agriculture Research Center | Push-down resistance measuring apparatus |
| CN106525297A (en) * | 2016-10-17 | 2017-03-22 | 天津城建大学 | Mini three dimensional effective stress box and test method of the same |
| CN109443604A (en) * | 2018-12-20 | 2019-03-08 | 大连理工大学 | A kind of three-dimensional soil pressure cell with incline measurement and accurate positioning function |
| CN111829711A (en) * | 2019-03-29 | 2020-10-27 | 新东工业株式会社 | Force sensor |
-
2021
- 2021-08-12 CN CN202110925165.XA patent/CN113758611A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001099732A (en) * | 1999-09-30 | 2001-04-13 | National Agriculture Research Center | Push-down resistance measuring apparatus |
| CN106525297A (en) * | 2016-10-17 | 2017-03-22 | 天津城建大学 | Mini three dimensional effective stress box and test method of the same |
| CN109443604A (en) * | 2018-12-20 | 2019-03-08 | 大连理工大学 | A kind of three-dimensional soil pressure cell with incline measurement and accurate positioning function |
| CN111829711A (en) * | 2019-03-29 | 2020-10-27 | 新东工业株式会社 | Force sensor |
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Effective date of registration: 20221031 Address after: 430071 small Hongshan 2, fruit lake street, Wuchang District, Wuhan, Hubei. Applicant after: INSTITUTE OF ROCK AND SOIL MECHANICS, CHINESE ACADEMY OF SCIENCES Applicant after: HUANENG LANCANG RIVER HYDROPOWER Inc. Applicant after: POWERCHINA ZHONGNAN ENGINEERING Corp.,Ltd. Applicant after: HUANENG GROUP TECHNOLOGY INNOVATION CENTER Co.,Ltd. Address before: 430071 small Hongshan 2, fruit lake street, Wuchang District, Wuhan, Hubei. Applicant before: INSTITUTE OF ROCK AND SOIL MECHANICS, CHINESE ACADEMY OF SCIENCES Applicant before: HUANENG LANCANG RIVER HYDROPOWER Inc. Applicant before: POWERCHINA ZHONGNAN ENGINEERING Corp.,Ltd. |
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Application publication date: 20211207 |