CN102384874A - Method and pressure chamber for measuring crack characteristics of damaged rock - Google Patents
Method and pressure chamber for measuring crack characteristics of damaged rock Download PDFInfo
- Publication number
- CN102384874A CN102384874A CN2011102437902A CN201110243790A CN102384874A CN 102384874 A CN102384874 A CN 102384874A CN 2011102437902 A CN2011102437902 A CN 2011102437902A CN 201110243790 A CN201110243790 A CN 201110243790A CN 102384874 A CN102384874 A CN 102384874A
- Authority
- CN
- China
- Prior art keywords
- pressure
- rock
- pressure chamber
- sample
- pressing plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
A method and a pressure chamber for measuring the crack characteristics of damaged rock are provided, wherein the method comprises the steps of: (1) the preparation of a rock test sample; (2) the mounting of the rock test sample: applying a rubber sleeve to the prepared test sample on which upper and lower water permeable conductive press plates and upper and lower waterproof gaskets are mounted previously, respectively, and then mounting the test sample in the pressure chamber so that the lower part of the test sample is flatly connected with the base of the pressure chamber while the upper part thereof is connected to a compression bar through a pressing cap; connecting a lead to the outside, and connecting upstream and downstream water pipes with water inlet and outlet pressure sensors, respectively; and finally, tightly connecting the outer cover of the pressure chamber with the base; (3) the application of a confining pressure and a back pressure: applying the confining pressure to 2-3 MPa according to the sealing requirements of the pressure chamber, so that a rubber film is tightly fitted in with the test sample; next, applying the back pressure of 1 MPa; (4) the hierarchical application of axial pressures: applying the axial pressures step by step according to the intensity of the rock test sample, and testing the stress-strain relationship of the rock under the axial pressure each time and the alternating-current impedance spectroscopy of the rock after the application of the axial pressure each time; and (5) the analysis of damage crack characteristics: analyzing the change law of the damage micro-cracks of the rock according to the characteristic parameters of impedance arcs on alternating-current impedance spectroscopy Nyquist curve. The method and the device are simple, clear in train of thought and convenient to operate.
Description
Technical field
The present invention relates to the problem of rock stability in rock mechanics and the engineering, specifically is a kind of method and pressure chamber of measuring rock crack damage characteristic in loading process.
Background technology
Rock is as a kind of hard brittle material, and its destructive process is actually underbead crack and produces, expands, merges until the process that connects.The generation of rock interior micro-crack, expansion are to influence the principal element that the rock macroscopic deformation destroys.The measurement Research of rock crackle forming expansion process is to the foundation of rock crackle forming model investigation and rock constitutive relation, and rock deformation and failure mechanism is all significant with the rock engineering estimation of stability.
From the 6O age in 20th century, people's rock crackle forming expansion process that begun one's study, the optical microphotograph observation method is applied in rock crackle forming research subsequently.So far, some modern physics also are widely used in rock and carefully see in the experimental measurement with the test mechanics method, like X-ray diffraction, rock CT, real-time holographic interferometry and by the digital image processing techniques of ESEM etc.But, because rock composition, structure and the complicacy of load-bearing environment and the temporary transient limitation of test method are at present also not nearly enough about the visual understanding of rock crackle forming expansion process.For this reason, explore more effective test observation method, realize that the continuous dynamic tracing of rock crackle forming expansion process still is one of problem of rock mechanics and engineering circle concern.
Summary of the invention
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
The pressure chamber of measurement Damaged Rock crackle characteristic of the present invention; Comprise pressure chamber's base and pressure chamber's outer cover, this pressure chamber also comprises a pressure chamber, and sample to be tested places in the pressure chamber; The sample top is provided with permeable conductive pressing plate and last water proof pad successively; Last water proof pad top is provided with and adds pressure cap, adds pressure cap and is connected with the depression bar of testing machine, and depression bar cooperates with pressure chamber's outer cover top slide; The sample bottom is provided with down permeable conductive pressing plate and following water proof pad successively, and the sample outer race is provided with rubber membrane; Go up permeable conductive pressing plate and be respectively equipped with external wire on the permeable conductive pressing plate down; The termination of upper reaches water pipe contacts with last permeable conductive pressing plate; Be connected with upper reaches water pipe and be provided with the discharge pressure sensor; The termination of downstream water pipe and following permeable conductive pressing plate joint; Being connected with the downstream water pipe is provided with the intake pressure sensor, and pressure chamber's base is provided with the confined pressure water inlet, the external PMU of confined pressure water inlet.
Sealing and fixing between pressure chamber's outer cover and the base among the present invention.
Pressure chamber of the present invention can be installed on the usual pressure testing machine and use.
The method of measurement Damaged Rock crackle characteristic of the present invention comprises the steps:
(1) preparation of rock sample: grind through drilling and to get the columned sample of 50mm * 100mm, then according to the full water of rock mechanics experiment standard;
(2) installation of rock sample: after installing upper and lower permeable conductive pressing plate and upper and lower water proof pad to the sample that makes in advance up and down respectively; Add rubber case; Be installed in then in the pressure chamber, bottom and pressure chamber's base flush, and top links to each other with depression bar through adding pressure cap; Be connected lead with outside, the upstream and downstream water pipe is connected with the water-in and water-out pressure transducer respectively; Closely be connected pressure chamber's outer cover with base at last;
(3) apply the confined pressure back-pressure: according to the requirement of pressure chamber's sealing, apply confined pressure, rubber membrane and sample are suited closely, then apply opposite pressure 1MPa to 2-3MPa;
(4) classification applies axial compression: according to rock sample intensity, echelon applies axial compression, tests the stress-strain relation of rock under each axial compression, and the rock ac impedance spectroscopy after each pressurization;
(5) crack damage signature analysis: the Changing Pattern of analyzing the damage of rock micro-crack through the characteristic parameter of impedance arc on the ac impedance spectroscopy Nyquist curve.
This method can be simulated the stressed operating mode of rock in the different rock engineerings through size, rock sample and the angle of stratum bedding of adjustment axial compression and confined pressure.The concrete steps of the preparation of testing in the said method, exert pressure test and interpretation of result all adopt process of the prior art.
Method of the present invention is placed on rock sample in the special pressure chamber; Through axial pressure, the mode of confined pressure protection can simulation rock load-bearing crack propagation; And pass through the electrochemical characteristic in the continuous up and down electrode test crack propagation process, thereby test the characteristic of its crack propagation.
Compare with prior art, its effect is actively with tangible.Can carry out the classification axial compression to rock through the present invention; Under the protection of confined pressure; The different actual conditions of simulation rock engineering safely; And measure the expansion process of rock crackle forming in real time through the electrochemical workstation that connects, significant for the stability analysis of research rock crackle forming propagation law and rock engineering.
Description of drawings
Fig. 1 is the structural representation of the pressure chamber among the present invention.
Fig. 2 is the Nyquist curve of gained in the embodiment of the invention.
Embodiment
The pressure chamber of measurement Damaged Rock crackle characteristic of the present invention is as shown in Figure 1; Comprise pressure chamber's base 11 and pressure chamber's outer cover 17, this pressure chamber also comprises a pressure chamber, and sample 5 to be tested places in the pressure chamber; The sample top is provided with permeable conductive pressing plate 4 and last water proof pad 3 successively; Last water proof pad 3 tops are provided with and add pressure cap 2, add pressure cap 2 and are connected with the depression bar 1 of testing machine, and depression bar 1 cooperates with pressure chamber's outer cover 17 top slide; The sample bottom is provided with down permeable conductive pressing plate 7 and following water proof pad 8 successively, and the sample outer race is provided with rubber membrane 6; Go up permeable conductive pressing plate and be respectively equipped with external wire 14 on the permeable conductive pressing plate down; External wire 14 is connected with power supply.The termination of upper reaches water pipe 16 contacts with last permeable conductive pressing plate 4; Be connected with upper reaches water pipe and be provided with discharge pressure sensor 13; The termination of downstream water pipe 15 contacts with following permeable conductive pressing plate 7; Being connected with the downstream water pipe is provided with intake pressure sensor 12, and 11 are provided with confined pressure water inlet 10 on pressure chamber's base, the external PMU of confined pressure water inlet.
The method of measurement Damaged Rock crackle characteristic of the present invention comprises the steps:
(1) preparation of rock sample: grind through drilling and to get the columned sample of 50mm * 100mm, then according to the full water of rock mechanics experiment standard;
(2) installation of rock sample: after installing upper and lower permeable conductive pressing plate and upper and lower water proof pad to the sample that makes in advance up and down respectively; Add rubber case; Be installed in then in the pressure chamber, bottom and pressure chamber's base flush, and top links to each other with depression bar through adding pressure cap; Be connected lead with outside, the upstream and downstream water pipe is connected with the water-in and water-out pressure transducer respectively; Closely be connected pressure chamber's outer cover with base at last;
(3) apply the confined pressure back-pressure: according to the requirement of pressure chamber's sealing, apply confined pressure, rubber membrane and sample are suited closely, then apply opposite pressure 1MPa to 2-3MPa;
(4) classification applies axial compression: according to rock sample intensity, echelon applies axial compression, tests the stress-strain relation of rock under each axial compression, and the rock ac impedance spectroscopy after each pressurization;
(5) crack damage signature analysis: the Changing Pattern of analyzing the damage of rock micro-crack through the characteristic parameter of impedance arc on the ac impedance spectroscopy Nyquist curve.
Below in conjunction with concrete case method of the present invention is further described: the middle sandstone of getting certain engineering; Grind into the cylindric sample of 50mm * 50mm through drilling; Be installed in the pressure chamber of Fig. 1; Install and connect water pipe and electrical wiring according to the regulation of above-mentioned test method (2), be noted that especially the sealing of pressure chamber's outer cover and bottom will be got well, be placed on the pressure chamber that connects at the pressure measurement position of RP testing machine.After one cutting apparatus is ready, at first applies pressure in a small amount and make the depression bar of rock sample and pressure testing machine closely contact, avoid the impact load of process of the test through pressure testing machine.Then apply through outer water pump and apply the load 2MPa of confined pressure, observe the level of intimate of rock sample and rubber membrane to appointment from the country rock water inlet.After meeting the demands, apply back-pressure 1MPa through outer water pump, observed and recorded back-pressure water delivering orifice sensor has force value just can classification apply axial compression later.According to the single shaft intensity level of being materialsed is 47MPa; Be divided into 5MPa to axial compression, 20MPa, three grades of loads of 40MPa apply; After each grade load finishes; Its ac impedance spectroscopy of electrochemical workstation test through electric wire connects can draw Nyquist curve as shown in Figure 2, analyzes the Changing Pattern of damage of rock micro-crack according to the characteristic parameter of impedance arc.
Claims (3)
1. pressure chamber of measuring Damaged Rock crackle characteristic; Comprise pressure chamber's base (11) and pressure chamber's outer cover (17); It is characterized in that: this pressure chamber also comprises a pressure chamber; Sample to be tested (5) places in the pressure chamber, and the sample top is provided with permeable conductive pressing plate (4) and last water proof pad (3) successively, and last water proof pad (3) top is provided with and adds pressure cap (2); Add pressure cap (2) and be connected with the depression bar (1) of testing machine, depression bar (1) cooperates with pressure chamber's outer cover top slide; The sample bottom is provided with down permeable conductive pressing plate (7) and following water proof pad (8) successively, and the sample outer race is provided with rubber membrane (6); Go up permeable conductive pressing plate (4) and be respectively equipped with external wire (14) on the permeable conductive pressing plate (7) down; The termination of upper reaches water pipe (16) contacts with last permeable conductive pressing plate (3); Be connected with upper reaches water pipe and be provided with discharge pressure sensor (13); The termination of downstream water pipe (15) and following permeable conductive pressing plate (7) joint; Being connected with the downstream water pipe is provided with intake pressure sensor (12), and pressure chamber's base is provided with confined pressure water inlet (10), the external PMU of confined pressure water inlet.
2. the pressure chamber of measurement Damaged Rock crackle characteristic according to claim 1 is characterized in that: sealing and fixing between pressure chamber's outer cover and the base.
3. a method of measuring Damaged Rock crackle characteristic is characterized in that comprising the steps:
(1) preparation of rock sample: grind through drilling and to get the columned sample of 50mm * 100mm, then according to the full water of rock mechanics experiment standard;
(2) installation of rock sample: after installing upper and lower permeable conductive pressing plate and upper and lower water proof pad to the sample that makes in advance up and down respectively; Add rubber case; Be installed in then in the pressure chamber, bottom and pressure chamber's base flush, and top links to each other with depression bar through adding pressure cap; Be connected lead with outside, the upstream and downstream water pipe is connected with the water-in and water-out pressure transducer respectively; Closely be connected pressure chamber's outer cover with base at last;
(3) apply the confined pressure back-pressure: according to the requirement of pressure chamber's sealing, apply confined pressure, rubber membrane and sample are suited closely, then apply opposite pressure 1MPa to 2-3MPa;
(4) classification applies axial compression: according to rock sample intensity, echelon applies axial compression, tests the stress-strain relation of rock under each axial compression, and the rock ac impedance spectroscopy after each pressurization;
(5) crack damage signature analysis: the Changing Pattern of analyzing the damage of rock micro-crack through the characteristic parameter of impedance arc on the ac impedance spectroscopy Nyquist curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110243790.2A CN102384874B (en) | 2011-08-24 | 2011-08-24 | Method and pressure chamber for measuring crack characteristics of damaged rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110243790.2A CN102384874B (en) | 2011-08-24 | 2011-08-24 | Method and pressure chamber for measuring crack characteristics of damaged rock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102384874A true CN102384874A (en) | 2012-03-21 |
| CN102384874B CN102384874B (en) | 2014-09-03 |
Family
ID=45824504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110243790.2A Active CN102384874B (en) | 2011-08-24 | 2011-08-24 | Method and pressure chamber for measuring crack characteristics of damaged rock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102384874B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802223A (en) * | 2014-01-20 | 2014-05-21 | 李衍远 | Method for making rock cracks grow and fracture through alternating tensile stress to manufacture slab stone |
| CN104236965A (en) * | 2013-06-09 | 2014-12-24 | 中国石油化工股份有限公司 | Core fracture preparation device and method |
| CN106124565A (en) * | 2016-07-08 | 2016-11-16 | 中国石油大学(北京) | A kind of sealing fixation measuring device for measuring tight rock impedance characteristic |
| CN108318528A (en) * | 2018-01-09 | 2018-07-24 | 中国石油天然气股份有限公司 | The determination method and apparatus of the running parameter of electric pulse pressure break |
| CN109142028A (en) * | 2018-08-20 | 2019-01-04 | 山东科技大学 | Working face driving causes coal seam deformation experimental rig |
| CN109443943A (en) * | 2018-11-26 | 2019-03-08 | 长江大学 | The construction method and equipment of rock specimens criterion of strength material parameter |
| CN114136791A (en) * | 2020-09-03 | 2022-03-04 | 中国电建集团华东勘测设计研究院有限公司 | Rock damage degree testing method under fluid-solid coupling effect |
| CN114136790A (en) * | 2020-09-03 | 2022-03-04 | 中国电建集团华东勘测设计研究院有限公司 | Stress testing method for hydraulic fracturing overall process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3992928A (en) * | 1975-11-28 | 1976-11-23 | Thoms Robert L | Measuring the strength of a rock formation in situ |
| US4152941A (en) * | 1978-05-08 | 1979-05-08 | Terra Tek, Inc. | Process for measuring the fracture toughness of rock under simulated down-hole stress conditions |
| CN101303321A (en) * | 2008-04-14 | 2008-11-12 | 中原工学院 | Method for testing rock microcracks |
| CN201716255U (en) * | 2010-07-14 | 2011-01-19 | 中原工学院 | Rock permeability testing device |
| CN102128741A (en) * | 2010-11-23 | 2011-07-20 | 山东大学 | Triaxial rheological test process and method for hard and crisp rock |
-
2011
- 2011-08-24 CN CN201110243790.2A patent/CN102384874B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3992928A (en) * | 1975-11-28 | 1976-11-23 | Thoms Robert L | Measuring the strength of a rock formation in situ |
| US4152941A (en) * | 1978-05-08 | 1979-05-08 | Terra Tek, Inc. | Process for measuring the fracture toughness of rock under simulated down-hole stress conditions |
| CN101303321A (en) * | 2008-04-14 | 2008-11-12 | 中原工学院 | Method for testing rock microcracks |
| CN201716255U (en) * | 2010-07-14 | 2011-01-19 | 中原工学院 | Rock permeability testing device |
| CN102128741A (en) * | 2010-11-23 | 2011-07-20 | 山东大学 | Triaxial rheological test process and method for hard and crisp rock |
Non-Patent Citations (2)
| Title |
|---|
| 胡江春 等: "交流阻抗谱法及其在岩石微裂纹检测中的应用", 《岩土工程学报》 * |
| 邵伟 等: "单轴压缩条件下含闭合双裂纹体岩石类材料的破坏机理", 《上海大学学报（自然科学版）》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236965A (en) * | 2013-06-09 | 2014-12-24 | 中国石油化工股份有限公司 | Core fracture preparation device and method |
| CN104236965B (en) * | 2013-06-09 | 2016-12-28 | 中国石油化工股份有限公司 | Rock core crack preparation facilities and method |
| CN103802223A (en) * | 2014-01-20 | 2014-05-21 | 李衍远 | Method for making rock cracks grow and fracture through alternating tensile stress to manufacture slab stone |
| CN106124565A (en) * | 2016-07-08 | 2016-11-16 | 中国石油大学(北京) | A kind of sealing fixation measuring device for measuring tight rock impedance characteristic |
| CN108318528A (en) * | 2018-01-09 | 2018-07-24 | 中国石油天然气股份有限公司 | The determination method and apparatus of the running parameter of electric pulse pressure break |
| CN109142028A (en) * | 2018-08-20 | 2019-01-04 | 山东科技大学 | Working face driving causes coal seam deformation experimental rig |
| CN109142028B (en) * | 2018-08-20 | 2020-11-03 | 山东科技大学 | Coal seam deformation test device caused by working face tunneling |
| CN109443943A (en) * | 2018-11-26 | 2019-03-08 | 长江大学 | The construction method and equipment of rock specimens criterion of strength material parameter |
| CN109443943B (en) * | 2018-11-26 | 2021-01-15 | 长江大学 | Method and equipment for constructing rock sample strength criterion material parameters |
| CN114136791A (en) * | 2020-09-03 | 2022-03-04 | 中国电建集团华东勘测设计研究院有限公司 | Rock damage degree testing method under fluid-solid coupling effect |
| CN114136790A (en) * | 2020-09-03 | 2022-03-04 | 中国电建集团华东勘测设计研究院有限公司 | Stress testing method for hydraulic fracturing overall process |
| CN114136791B (en) * | 2020-09-03 | 2023-12-12 | 中国电建集团华东勘测设计研究院有限公司 | Rock damage degree testing method under fluid-solid coupling effect |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102384874B (en) | 2014-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102384874B (en) | Method and pressure chamber for measuring crack characteristics of damaged rock | |
| CN104596862B (en) | Creep of rock seepage coupling test system | |
| CN108827774B (en) | Coal petrography brittleness evaluation method | |
| CN202330236U (en) | Rock mechanical test device under gas seepage-creep combined action | |
| CN107202736B (en) | Multifunctional hydrate characteristic test experimental device | |
| CN102494981A (en) | Device for testing gas seepage and creepage coupling action of rocks | |
| WO2022228537A1 (en) | Medium strain rate testing device capable of controlling and loading axial pressure and confining pressure, and method | |
| CN102680341B (en) | Loading device for concrete material crack growth test under dynamic load | |
| CN103076238B (en) | Testing device and method for bend-shear performance of asphalt mixture | |
| CN103926479B (en) | coal gas migration process charge monitoring device and monitoring method thereof | |
| CN203688355U (en) | Three-point bending test clamp for testing stress corrosion cracking speed rate | |
| CN113447633A (en) | Movable experimental device for high-voltage electric pulse induced cracking loaded coal containing gas | |
| CN203638110U (en) | Comprehensive test system | |
| CN203929593U (en) | A kind of high-temperature high-pressure apparatus material corrosion comprehensive study experiment table reactor | |
| CN104181002A (en) | Uniform water pressure simulation loading device and method for tunnel structure model test | |
| CN206177710U (en) | Device of test metal material stress corrosion action under fluid high pressure | |
| CN103604701A (en) | Device and method for detecting concrete compressive strength of in-service electric pole | |
| CN203519430U (en) | Sealing device for water pressure test of gas cylinder in water jacket method | |
| CN202267582U (en) | Welded pipe ultrahigh pressure hydraulic pressure testing stand | |
| CN203721826U (en) | Fuel cell pack capable of monitoring assembly force on line | |
| CN208383620U (en) | A kind of rock cleavage load testing machine with side pressure | |
| CN206430840U (en) | The foil gauge lead tested for boring method in residual stress is connected device | |
| CN206756545U (en) | A kind of artificial core clamps evaluating apparatus | |
| LU102165B1 (en) | High-voltage pulse discharge fracturing experiment platform for reforming oil and gas reservoirs | |
| CN201291132Y (en) | Organic matter hydrocarbon-generation analog equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |