CN110595657A - Small-aperture 16-component conical strain gauge - Google Patents
Small-aperture 16-component conical strain gauge Download PDFInfo
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- CN110595657A CN110595657A CN201910896887.XA CN201910896887A CN110595657A CN 110595657 A CN110595657 A CN 110595657A CN 201910896887 A CN201910896887 A CN 201910896887A CN 110595657 A CN110595657 A CN 110595657A
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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
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a small-aperture 16-component conical strain gauge which comprises a strain head, a piston rod and a liquid storage cavity, wherein a positioning pin is arranged at the upper end of the piston rod, the strain head comprises an aluminum cap, a glue outlet hole, a strain gauge, a pasting groove, an adhesive check ring, a lead hole and a temporary fixing hole, the pasting groove is arranged on the outer wall of the strain head, the strain gauge is arranged in the pasting groove, the lead hole is arranged on the periphery of the strain head and communicated with the pasting groove, a data wire of the strain gauge extends out of the lead hole, after the liquid storage cavity is filled with epoxy resin mixed glue liquid, an aluminum wire penetrates through the temporary fixing hole to enable the piston rod to be connected with the front end strain head, the piston rod moves towards the direction of the liquid storage cavity, and the mixed glue liquid overflows from the glue. The invention can collect rock strain data in 16 different directions, and the ground stress measurement result is more accurate; the aperture of the required drill hole is 60mm, the single-point installation period is shortened from the past 6h to 2h, and the test efficiency is high; the three-dimensional ground stress can be measured, and the test result is more reliable.
Description
Technical Field
The invention relates to the field of geophysical rock stress measurement, in particular to a small-aperture 16-component conical strain gauge.
Background
The ground stress is the most fundamental acting force of underground geotechnical engineering disasters, is a key factor influencing the engineering stability, and the acquisition of ground stress data of an engineering area is important for enterprise safety production. Meanwhile, the accurate measurement of the crustal stress is also a subject of cumin exploration by scientific researchers.
Generally, the earth stress measuring method is classified into a direct method and an indirect method, and the trepanning stress relieving method and the hydraulic fracturing method are the most commonly used earth stress measuring methods of the direct method and the indirect method, respectively. The hole bottom stress relieving method is one of the sleeve hole stress relieving methods, and the method is that a strain gauge is pasted at the hole bottom of a horizontal drilling hole, then a large hole sleeve core is drilled, and the three-dimensional ground stress of a measuring point is obtained through inverse calculation by collecting hole bottom deformation data in the sleeve core process and combining rock mechanical parameters.
Compared with the stress relief method of the trepanning of the hollow inclusion, the stress relief method of the hole bottom does not need to drill a small hole at the hole bottom, the test success rate is improved, but the small-hole ground stress test method is absolutely necessary to be developed because the construction hole diameter is about 130mm generally, the test efficiency is low, and the test period is long, and the research and development of the small-hole-diameter strain gauge are the primary problems to be solved. At present, no strain gauge suitable for a small-aperture hole bottom stress relief method exists in the prior art.
Disclosure of Invention
The invention provides a small-aperture 16-component conical strain gauge, aiming at solving the technical problems of low ground stress testing rate, long cycle time and the like in the current hole bottom stress relief method, which can acquire rock strain data in 16 different directions and has more accurate measuring result, high testing efficiency, short cycle time and more reliable measuring result.
A conical strain gauge with a small aperture and a 16-component comprises a strain head, a piston rod and a liquid storage cavity, wherein an installation positioning pin is arranged at the upper end of the piston rod and is in fit connection with a concave groove of an installation rod through the installation positioning pin, the strain head comprises an aluminum cap, a glue outlet hole, a strain sheet, a pasting groove, an adhesive retaining ring, a lead hole and a temporary fixing hole, the pasting groove is formed in the outer wall of the strain head, the strain sheet is installed in the pasting groove, the lead hole is formed in the peripheral side of the strain head and is communicated with the pasting groove, a data transmission line of the strain sheet extends out of the lead hole, after the liquid storage cavity is filled with epoxy resin mixed glue liquid, an aluminum wire penetrates through the temporary fixing hole, the piston rod is connected with the strain head, the piston rod moves towards the direction of the liquid storage cavity, and the epoxy resin mixed glue liquid overflows from the glue outlet hole and is, and the epoxy resin mixed glue solution is stored in a gap between the strain gauge and the bottom of the hole.
Further, the head of the strain gauge is conical, and the hole diameter of the adaptive drill hole is 60 mm.
Further, 16 groups of strain gauges are total, and every groove of pasting is stained with 2 groups of strain gauges, and first group strain gauge level sets up, and the first group strain gauge setting of second group strain gauge perpendicular to, paste the groove along toper strain head week side evenly distributed, the contained angle of adjacent groove of pasting is 45.
Furthermore, the adhesive retainer ring is arranged on the periphery of the conical strain head, and the outer edge of the adhesive retainer ring exceeds the conical outer edge of the strain head by 10 mm.
Further, the outer diameter of the piston rod is 1-2 mm smaller than the inner diameter of the glue storage cavity.
Further, the installation positioning pin is fixedly connected with the piston rod.
Further, the path length is 3cm and the diameter is 3 mm.
The invention has the beneficial effects that:
1) the small-aperture 16-component conical strain gauge provided by the invention can acquire 16 rock strain data in different directions, and the test data is complete, so that the crustal stress measurement result is more accurate;
2) the small-aperture 16-component conical strain gauge provided by the invention has the advantages that the aperture of a required drilled hole is 60mm, the testing efficiency is high, and the single-point installation period is shortened from the past 6h to 2 h;
3) compared with a hydraulic fracturing method, the small-aperture 16-component conical strain gauge provided by the invention can measure three-dimensional ground stress, and the test result is more reliable.
Drawings
FIG. 1 is a schematic diagram of a small aperture 16 component conical strain gauge configuration of the present invention;
FIG. 2 is a schematic diagram of an epoxy resin injection glue storage cavity during installation of the small-aperture 16-component conical strain gauge of the present invention;
FIG. 3 is a schematic view of an aluminum wire penetrating into a temporary fixing hole during the installation of the small-aperture 16-component conical strain gauge of the present invention;
FIG. 4 is a schematic view of a mounting rod pushed into a test hole during the mounting process of the small-aperture 16-component conical strain gauge of the present invention;
FIG. 5 is a schematic view of the installation of the small-aperture 16-component conical strain gauge after the installation rod is withdrawn during the installation process;
fig. 6 is a schematic diagram of the stress relief process of the small aperture 16 component conical strain gauge of the present invention.
In the figure: 1-aluminum cap, 2-glue outlet hole, 3-strain gauge and sticking groove, 4-binder retainer ring, 5-lead hole, 6-glue storage cavity, 7-temporary fixing hole, 8-piston rod, 9-installation positioning pin, 10-data transmission line, 11-epoxy resin mixed liquid, 12-aluminum wire, 13-installation rod and 14-fixing disc.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The small-aperture 16-component conical strain gauge comprises an aluminum cap 1, a glue outlet hole 2, a strain gauge and pasting groove 3, a binder retainer ring 4, a lead hole 5, a glue storage cavity 6, a temporary fixing hole 7, a piston rod 8 and a mounting positioning pin nail 9.
The total 16 groups of foil gage, 2 groups of foil gage are glued to every groove of pasting, and first group foil gage level sets up, and the first group foil gage of second group foil gage perpendicular sets up, pastes the groove and follows conical strain head week side evenly distributed, and the contained angle of adjacent groove of pasting is 45. The outer edge of the adhesive retainer ring 4 exceeds the outer edge of the cone by 10mm, so as to keep the extruded mixed glue solution in a gap between the strain gauge and the bottom of the hole and in a sealing state. The outer diameter of the piston rod 8 is 1-2 mm smaller than the inner diameter of the glue storage cavity 6, so that the piston rod 8 can freely enter and exit the glue storage cavity 6. The lead slot 7 is a data transmission line 10 for leading out a 16-component strain gauge. The mounting positioning pin 9 is fixed with the piston rod 8, and the mounting positioning pin 9 is inserted into the mounting rod groove during mounting. During installation, an aluminum wire 12 with the length of about 3cm and the diameter of about 3mm penetrates through the temporary fixing hole 7, and the rear end piston rod 8 is connected with the front end strain head, so that the conical strain gauge is integrated.
The small-aperture 16-component conical strain gauge of the embodiment is used for carrying out an earth stress test, and comprises the following steps:
a) separating the piston rod 8 from the front end strain head, fully stirring the epoxy resin mixed solution 11, and injecting the epoxy resin mixed solution into the glue storage cavity 6 and filling the glue storage cavity with the epoxy resin mixed solution;
b) the piston rod 8 is lightly arranged in the glue storage cavity 6 filled with mixed glue solution, the temporary fixing holes of the piston rod and the glue storage cavity are aligned, an aluminum wire 12 with the length of 3cm and the diameter of 3mm penetrates through one end of the piston rod and the other end of the piston rod, and the aluminum wire 12 cannot be bent to enable the conical strain gauge to be integrated;
c) inserting the mounting positioning pin 9 into a mounting rod concave groove, wherein the concave groove is filled with butter in advance;
d) the data line penetrates out of the hole of the fixed disc 14, and the strain gauge is sent to the bottom of the hole by using the mounting rod 13, so that the aluminum cap 1 is in contact with rock at the bottom of the hole;
e) the mounting rod is pushed by force, so that the aluminum wire is cut off by the piston rod 8, the mixed glue solution in the glue storage cavity 6 overflows from the glue outlet hole 2 and is blocked by the adhesive retainer ring 4, and after the mixed glue solution is kept stand for 24 hours, the strain gauge is bonded with the rock at the bottom of the hole;
f) and (3) adopting a core sleeving drill bit to perform core sleeving on the rock at the bottom of the hole with the strain gauge, connecting a hole external data line and a strain acquisition instrument, and acquiring strain data at the bottom of the hole in the core sleeving process so as to calculate the ground stress.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a 16 components toper strainometers in aperture, the strainometer includes strain head, piston rod and stock solution cavity, and the piston rod upper end is provided with installation shop bolt, is connected its characterized in that through installation shop bolt and installation pole concave groove cooperation: the strain head comprises an aluminum cap, a glue outlet hole, a strain gauge, a pasting groove, an adhesive retainer ring, a lead hole and a temporary fixing hole, the pasting groove is formed in the outer wall of the strain head, the strain gauge is installed in the pasting groove, the lead hole is formed in the periphery of the strain gauge and communicated with the pasting groove, a data transmission line of the strain gauge extends out of the lead hole, an aluminum wire penetrates through the temporary fixing hole after the liquid storage cavity is filled with epoxy resin mixed glue, the piston rod is connected with the strain head, the piston rod moves towards the direction of the liquid storage cavity, the epoxy resin mixed glue flows out of the glue outlet hole and is blocked by the adhesive retainer ring, and the epoxy resin mixed glue is stored in a gap between the strain gauge and the bottom of the hole.
2. A small aperture 16 component conical strain gauge as claimed in claim 1 wherein the gauge head is conical to accommodate a borehole aperture of 60 mm.
3. The small-aperture 16-component conical strain gauge according to claim 2, wherein the strain gauge comprises 16 groups, each sticking groove is adhered with 2 groups of strain gauges, the first group of strain gauges is horizontally arranged, the second group of strain gauges is vertically arranged with the first group of strain gauges, the sticking grooves are uniformly distributed along the peripheral side of the conical strain head, and the included angle between every two adjacent sticking grooves is 45 degrees.
4. The small aperture 16-component conical strain gauge according to claim 2, wherein the adhesive collar is disposed around the conical strain head with an outer edge 10mm beyond the conical outer edge of the strain head.
5. A small aperture 16 component conical strain gauge according to claim 1 wherein: the outer diameter of the piston rod is 1-2 mm smaller than the inner diameter of the glue storage cavity.
6. A small aperture 16 component conical strain gauge according to claim 1 wherein: the mounting positioning pin is fixedly connected with the piston rod.
7. A small aperture 16 component conical strain gauge according to any one of claims 1 to 6 wherein the path length is 3cm and the diameter is 3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910896887.XA CN110595657A (en) | 2019-09-23 | 2019-09-23 | Small-aperture 16-component conical strain gauge |
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| CN201910896887.XA CN110595657A (en) | 2019-09-23 | 2019-09-23 | Small-aperture 16-component conical strain gauge |
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| CN110595657A true CN110595657A (en) | 2019-12-20 |
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| CN201910896887.XA Pending CN110595657A (en) | 2019-09-23 | 2019-09-23 | Small-aperture 16-component conical strain gauge |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780707A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain measuring device |
| CN111780708A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain gauge |
| CN111780792A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Method for mounting measuring piece for bridge detection |
| CN112461189A (en) * | 2020-11-03 | 2021-03-09 | 中国地质科学院地质力学研究所 | Ground stress measuring strain gauge |
| CN113019811A (en) * | 2020-06-06 | 2021-06-25 | 河南交院工程技术有限公司 | Sensor device and sensor support thereof |
| CN113029774A (en) * | 2020-06-06 | 2021-06-25 | 河南交院工程技术有限公司 | Sensor support and sensor device using same |
| CN113984268A (en) * | 2021-11-08 | 2022-01-28 | 安徽隧派智能科技有限公司 | Hole wall strain type three-dimensional real-time stress monitoring device |
| CN115420251A (en) * | 2022-11-02 | 2022-12-02 | 煤炭科学研究总院有限公司 | Twelve-component small-aperture hole bottom strain gauge |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780707A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain measuring device |
| CN111780708A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain gauge |
| CN111780792A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Method for mounting measuring piece for bridge detection |
| CN113019811A (en) * | 2020-06-06 | 2021-06-25 | 河南交院工程技术有限公司 | Sensor device and sensor support thereof |
| CN113029774A (en) * | 2020-06-06 | 2021-06-25 | 河南交院工程技术有限公司 | Sensor support and sensor device using same |
| CN111780708B (en) * | 2020-06-06 | 2021-12-14 | 河南交院工程技术集团有限公司 | Strain gauge |
| CN111780707B (en) * | 2020-06-06 | 2021-12-14 | 河南交院工程技术集团有限公司 | Strain measuring device |
| CN112461189A (en) * | 2020-11-03 | 2021-03-09 | 中国地质科学院地质力学研究所 | Ground stress measuring strain gauge |
| CN112461189B (en) * | 2020-11-03 | 2021-07-23 | 中国地质科学院地质力学研究所 | Ground stress measuring strain gauge |
| CN113984268A (en) * | 2021-11-08 | 2022-01-28 | 安徽隧派智能科技有限公司 | Hole wall strain type three-dimensional real-time stress monitoring device |
| CN115420251A (en) * | 2022-11-02 | 2022-12-02 | 煤炭科学研究总院有限公司 | Twelve-component small-aperture hole bottom strain gauge |
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Application publication date: 20191220 |