CN110296899B - Test method for researching rock creep by unpowered stress locking - Google Patents
Test method for researching rock creep by unpowered stress locking Download PDFInfo
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- CN110296899B CN110296899B CN201910625436.2A CN201910625436A CN110296899B CN 110296899 B CN110296899 B CN 110296899B CN 201910625436 A CN201910625436 A CN 201910625436A CN 110296899 B CN110296899 B CN 110296899B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/027—Specimens with holes or notches
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A test method for researching rock creep by unpowered stress locking is characterized in that a hole is directly formed in a test rock, a test device is installed in the hole, expanding agents with different matching specifications are filled around test equipment in the hole to simulate loading force, a telescopic rod of the test device is matched to stretch and retract to change micro-control stress, and rock creep data is obtained through a pressure sensor embedded in the expanding agents and a strain gauge of a rock hole wall and then is researched.
Description
Technical Field
The invention belongs to the technical field of rock stress research, and relates to a test method for researching rock creep by unpowered stress locking.
Background
In the field of material mechanics, creep is the phenomenon that strain of a solid material increases with time under the condition of keeping stress unchanged. Solid materials may creep when subjected to stresses below the yield stress of the material for extended periods. By applying pressure to the material and over time, the creep phase-typically roughly divided into three phases of decay, stabilization, acceleration. And the rock creep under the action of dynamic disturbance means that the stress state of the surrounding rock is within the rock strength limit stress, and the surrounding rock generates certain creep deformation. Meanwhile, the rock creep of the load is suddenly and randomly disturbed by power in the creep process. The random dynamic disturbance effect can cause creep deformation of surrounding rocks to generate great influence, at present, the load capacity cannot be great by adopting gravity loading, hydraulic loading is inconvenient to maintain, operation is heavy, and the cost of a stress lock test is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a test method for researching rock creep by unpowered stress locking.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a test method for researching rock creep without power stress locking is characterized by comprising the following steps:
a test method for researching rock creep without power stress locking is characterized by comprising the following steps:
step 1, punching the rock at uniform intervals, cleaning sundries in holes, and numbering the holes;
step 1-1, arranging a pressure sensor and a strain gauge in the hole axis direction, and tightly attaching the pressure sensor and the strain gauge to the side wall of a hole;
step 1-2, cutting cuboid pores at the same distance positions on two sides of a hole by using a water jet cutter, and cleaning impurities in the hole;
step 1-3, coating a layer of heat insulation gel on the surface of a heating metal plate, and inserting the heating metal plate into a cuboid pore;
step 1-4, filling a gap between a heating metal plate and a rock with heat insulation sol;
step 2, placing a test device in the hole;
step 2-1, operating a telescopic control device of the test device, extending a telescopic rod under the action of an internal wheel shaft system through machine transmission, and operating the telescopic rod to expand the whole device;
step 2-2, sealing the interior of the test device to prevent the expanding agent from entering the interior of the device;
step 3-1, wrapping the ceramsite with the same specification by cloth;
3-2, uniformly arranging a layer of ceramsite layer at equal intervals in the hole opposite to the two sides of the test device;
and 4, step 4: filling an expanding agent;
step 4-1: putting a swelling agent between the test device and the hole wall;
step 4-2: adding water, stirring uniformly to make the expanding agent expand and apply loading force to the rock sample;
step 4-3: placing a pressure sensor inside the swelling agent;
and 5: installing a ground anchor;
step 5-1: anchoring a ground anchor;
step 5-2: a pressure sensor is added at the contact position of the anchor rod and the pressure plate;
step 5-3: the anchor rod is stressed to provide stable vertical restraint;
step 6, adjusting stress;
step 6-1, heating the heating metal plate;
and 6-2, loosening the test device, manually operating, recovering the telescopic rod, and gradually unloading the stress of the expanding agent on the rock sample.
The utility model provides a test method of unpowered stress lock research rock creep, through direct trompil on the test rock, at downthehole installation test device, through filling the expanding agent simulation loading power of different cooperation specifications around downthehole test equipment to the flexible stress that changes of telescopic link of cooperation test device, through burying strain gage and the pressure sensor of burying underground in the expanding agent and obtain rock creep data and study again, with low costs, easy operation is convenient.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a plan view of the test of the present invention.
Fig. 2 is a schematic view of the internal structure of fig. 1.
FIG. 3 is a schematic view of the telescopic control device and the telescopic rod of the present invention
In the figure: the device comprises a test device 1, a ceramsite layer 2, a heating metal plate 3, an expanding agent 4 and a ground anchor 5.
Detailed Description
As shown in fig. 1 to 3, a test method for researching rock creep without dynamic stress locking is characterized by comprising the following steps:
step 1, drilling a hole in a rock, and cleaning impurities in the hole;
step 1-1, arranging a strain gauge in the direction of a hole axis;
step 1-2, cutting cuboid pores at the same distance positions on two sides of a hole by using a water jet cutter, and cleaning impurities in the hole; the purpose of this step is to place a heating metal plate 3, which is heated during operation, and to heat the metal plate
The loading force is generated after expansion, the cost is low, and the operation is simple and convenient.
Preferably, the size of the rectangular parallelepiped pore space may be determined according to the actual size of the sample rock and the heated metal plate.
Step 1-3, coating a layer of heat insulation gel on the surface of a heating metal plate 3, and inserting the heating metal plate 3 into a cuboid pore;
step 1-4, filling a gap between a heating metal plate and a rock with heat insulation sol; the purpose of this step lies in, is filled in between cuboid space and the heating metal sheet 3, is favorable to heating metal sheet expansion back and rapidly conducts the loading force to the sample rock for stress can direct transfer, reduces the consumption of energy and has increased the research precision of experiment.
Step 2, placing a test device 1 in the hole;
step 2-1, operating a telescopic control device of the test device 1, extending a telescopic rod through machine transmission under the action of an internal wheel shaft system, and operating the telescopic rod to expand the whole device;
step 2-2, sealing the interior of the test device to prevent the expanding agent from entering the interior of the device;
step 3-1, wrapping the ceramsite with the same specification by cloth;
3-2, uniformly arranging a layer of ceramsite layer at equal intervals in the hole opposite to the two sides of the test device 1; the stress that the ceramsite layer can bear is determined according to the maximum stress of an expanding agent used in an experiment, the stress is close to the maximum stress that the expanding agent can provide, the pressure can be stabilized when the expanding agent reaches the maximum stress, the requirement on the proportion of the expanding agent is reduced, and the complexity of experiment operation is reduced; the stress provided by the expanding agent can be better controlled by controlling the uniform distribution of the ceramsite, and the uneven distribution of the stress is prevented.
And 4, step 4: filling an expanding agent;
step 4-1: putting a swelling agent between the test device 1 and the hole wall;
step 4-2: adding water, stirring uniformly to make the expanding agent expand and apply loading force to the rock sample;
step 4-3: placing a pressure sensor inside the swelling agent; the purpose of this step is to measure the internal stress level.
The corresponding table of the content of the expanding agent and the expansion stress is as follows:
| content of swelling agent | Expansion stabilizing pressure kg |
| 10% | 22.341 |
| 20% | 29.242 |
| 25% | 36.671 |
| 30% | 41.983 |
And 5: installing a ground anchor 5;
step 5-1: anchoring a ground anchor; the purpose of this step is to prevent the test device from extrusion failure under the upward expansion stress created by the expanding agent, while providing stable vertical restraint.
Step 5-2: adding a pressure sensor at the anchor rod; this step is aimed at measuring the maximum stress provided by the vertical expansion of the expanding agent.
Step 5-3: the anchor rod is stressed to displace; the purpose of this step is to measure the deformation and displacement caused by rock creep by strain gauge and pressure sensor, or to study the deformation caused by rock creep by ultrasonic acoustic emission.
Step 6, adjusting stress;
step 6-1, heating the heating metal plate 3; the step aims to enable the volume of the heating metal plate to expand to extrude the rock by the principle of expansion with heat and contraction with cold of the heating metal plate, load the rock to a certain degree and study the change condition of rock creep under the loading stress of the rock.
And 6-2, loosening the test device 1, recovering the telescopic rod through manual operation, and gradually unloading the stress of the expanding agent 4 on the rock sample. The purpose of this step was to study the change in creep of the rock under conditions of slight stress relief.
In the above steps, the experimental device 1 used comprises four high-strength alloy plates connected with a telescopic control device through telescopic rods. After the telescopic rod is completely extended out, the telescopic rod and the base can be spliced into a cuboid with an opening at the upper part. The high-strength alloy plate is not easy to deform under the stress of an expanding agent in a megapascal level. The high-strength alloy plates are A, B, the A-type alloy plate can be provided with a metal sheet extending from two ends through manual operation, and the B-type fan-shaped sheet is provided with grooves at two sides to better connect the metal sheets extending from the A-type fan-shaped plate. When the device is not used, the telescopic rod can be retracted into the engine, and the base is provided with the sliding groove, so that the alloy plate is convenient to recycle. When the telescopic control device is used, the telescopic control device can be operated, the telescopic rod can be driven by a machine to extend out under the action of the internal wheel shaft system to form a cuboid outline, and then the metal sheets of the A-type alloy plates are operated to be completely spliced together. A reaction force action system consisting of a ground anchor and a pressing plate is installed to prevent the device from being extruded by the expanding agent, and a stress sheet is installed on the reaction force action system to obtain a stress value. If the experiment is finished or the stress is changed, the metal sheets at the two ends of the A-type fan-shaped sheet are recycled, and then the shrinkage rod can be recycled to manufacture a face surface in the expanding agent. The swelling agent will eventually experience an unconfined breakdown. At the moment, the operation can be repeated, a certain proportion and a certain volume of the expanding agent are added again, different stresses are produced, and the stress is locked again. The high-strength alloy plate is provided with stress sheets coated with nano coatings to prevent the adhesion of the expanding agent.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (1)
1. A test method for researching rock creep without power stress locking is characterized by comprising the following steps:
step 1, punching the rock at uniform intervals, cleaning sundries in holes, and numbering the holes;
step 1-1, arranging a pressure sensor and a strain gauge in the hole axis direction, and tightly attaching the pressure sensor and the strain gauge to the side wall of a hole;
step 1-2, cutting cuboid pores at the same distance positions on two sides of a hole by using a water jet cutter, and cleaning impurities in the hole;
step 1-3, coating a layer of heat insulation gel on the surface of a heating metal plate (3), and inserting the heating metal plate (3) into a cuboid pore;
step 1-4, filling a gap between a heating metal plate and a rock with heat insulation sol;
step 2, placing a test device (1) in the hole; the testing device (1) comprises four high-strength alloy plates which are connected with a telescopic control device through telescopic rods;
step 2-1, operating a telescopic control device of the test device (1), and extending out a telescopic rod through machine transmission under the action of an internal wheel shaft system to expand the whole device;
step 2-2, sealing the interior of the test device to prevent the expanding agent from entering the interior of the device;
step 3, arranging a ceramsite layer (2);
step 3-1, wrapping the ceramsite with the same specification by cloth;
3-2, uniformly arranging a layer of ceramsite layer at equal intervals on two sides of the test device (1) in the hole;
and 4, step 4: filling an expanding agent;
step 4-1: putting a swelling agent between the test device (1) and the hole wall;
step 4-2: adding water, stirring uniformly to make the expanding agent expand and apply loading force to the rock sample;
step 4-3: placing a pressure sensor inside the swelling agent;
and 5: installing a ground anchor (5);
step 5-1: anchoring a ground anchor;
step 5-2: a pressure sensor is added at the contact position of the anchor rod and the pressure plate;
step 5-3: the anchor rod is stressed to provide stable vertical restraint;
step 6, adjusting stress;
step 6-1, heating the heating metal plate (3);
and 6-2, loosening the test device (1), recovering the telescopic rod through manual operation, and gradually unloading the stress of the expanding agent (4) on the rock sample.
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| CN201910625436.2A CN110296899B (en) | 2019-07-11 | 2019-07-11 | Test method for researching rock creep by unpowered stress locking |
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| CN201910625436.2A CN110296899B (en) | 2019-07-11 | 2019-07-11 | Test method for researching rock creep by unpowered stress locking |
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| CN110296899B true CN110296899B (en) | 2021-07-13 |
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| CN111735724B (en) * | 2020-06-23 | 2023-03-10 | 三峡大学 | Device and method for detecting creep stress of in-situ rock-soil body |
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| US4673218A (en) * | 1985-10-18 | 1987-06-16 | Okumura Corporation | Tunnel excavation method |
| CN203534910U (en) * | 2013-10-15 | 2014-04-09 | 合肥工业大学 | Triaxial creep testing device for stress, seepage and chemical coupling of rock |
| CN107462492A (en) * | 2017-07-17 | 2017-12-12 | 三峡大学 | The anchor rod anchored research method of large dosage swelling agent is carried out for CT scan technology |
| CN109030340A (en) * | 2018-07-16 | 2018-12-18 | 三峡大学 | A kind of self-expanding Load-unload device and method |
| CN109163985A (en) * | 2018-08-15 | 2019-01-08 | 三峡大学 | A kind of in-situ testing device and method of test rock sample shearing strength and long-term creep deformation |
| CN109374409A (en) * | 2018-10-16 | 2019-02-22 | 三峡大学 | A kind of method of on-site rapid measurement crustal stress |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10526523B2 (en) * | 2016-02-11 | 2020-01-07 | Schlumberger Technology Corporation | Release of expansion agents for well cementing |
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- 2019-07-11 CN CN201910625436.2A patent/CN110296899B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4673218A (en) * | 1985-10-18 | 1987-06-16 | Okumura Corporation | Tunnel excavation method |
| CN203534910U (en) * | 2013-10-15 | 2014-04-09 | 合肥工业大学 | Triaxial creep testing device for stress, seepage and chemical coupling of rock |
| CN107462492A (en) * | 2017-07-17 | 2017-12-12 | 三峡大学 | The anchor rod anchored research method of large dosage swelling agent is carried out for CT scan technology |
| CN109030340A (en) * | 2018-07-16 | 2018-12-18 | 三峡大学 | A kind of self-expanding Load-unload device and method |
| CN109163985A (en) * | 2018-08-15 | 2019-01-08 | 三峡大学 | A kind of in-situ testing device and method of test rock sample shearing strength and long-term creep deformation |
| CN109374409A (en) * | 2018-10-16 | 2019-02-22 | 三峡大学 | A kind of method of on-site rapid measurement crustal stress |
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Application publication date: 20191001 Assignee: Hongchuang (Yichang) Architectural Design Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980031470 Denomination of invention: Test method for studying rock creep without dynamic stress locking Granted publication date: 20210713 License type: Common License Record date: 20230116 |
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Assignee: Hongchuang (Yichang) Architectural Design Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980031470 Date of cancellation: 20230721 |
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