CN101509852A - Test methods for acquiring thick wall cylinder sample ring fracture - Google Patents
Test methods for acquiring thick wall cylinder sample ring fracture Download PDFInfo
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- CN101509852A CN101509852A CNA2009100262535A CN200910026253A CN101509852A CN 101509852 A CN101509852 A CN 101509852A CN A2009100262535 A CNA2009100262535 A CN A2009100262535A CN 200910026253 A CN200910026253 A CN 200910026253A CN 101509852 A CN101509852 A CN 101509852A
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Abstract
The invention relates to a test method for obtaining ring fracture of a cylinder sample with thick wall. The method comprises the following steps: firstly, sampling is carried out to testing rock mass objects; the rock mass which is obtained by sampling is made into the cylinder sample with thick wall; a certain axle load is applied to the cylinder sample with thick wall so as to lead the sample and an upper rigid loading end part and a lower rigid loading end part to contact closely; oil is filled into inner holes of the cylinder sample with thick wall, and into gaps between the cylinder sample and a load chamber; three axles of inner pressure, confining pressure and axle pressure of the cylinder sample with thick wall are loaded to a designed pressure value so as to lead the top, the bottom, the inner hole wall and the outer wall of the cylinder sample with thick wall are respectively in pressure state; the axial loading of three-directional loading is kept to be constant; and unloading is carried out to the cylinder sample with thick wall till the test sample is damaged. Three axles test is carried out to the cylinder sample with thick wall by loading and unloading so as to obtain the ring fracture results of the cylinder sample with thick wall, which is similar with the subarea fracture phenomenon occurring when the deep rock mass is excavated, therefore, the subarea fracture research is carried out, and corresponding measures need to be adopted for solving the problem that the subarea fracture phenomenon occurs when the deep rock is excavated.
Description
Technical field
The present invention relates to a kind of test method of obtaining thick wall cylinder sample ring fracture, be particularly useful for simulating the experiment of deep rock excavation project circumferential separation process, also be applicable to the experiment of simulation as hard brittle material circumferential separation processes such as concrete.
Background technology
Many scholars have found a kind of subregion phenomenon of rupture in the surrounding rock failure of mine, deep both at home and abroad.When so-called subregion fracture was meant in deep rock mass the excavation tunnel, the tunnel-surrounding country rock can produce rupture zone alternately and rupture zone phenomenon not.Just the report of subregion phenomenon of rupture occurs relevant for the Witwatersrand gold mine 2000m～back of 3000m depths as far back as South Africa in 1980, Russia similar phenomenon also occurred in М а я к mine.Should, China finds that the time of deep tunnel country rock subregion fracture phenomena is not late.According to existing field data, find that in power platform ore deposit, Xuzhou roadway bolt not only is subjected to action of pulling stress as far back as Lee's generation equality in 1979, go back the phenomenon of compression chord effect; He Yongnian in 1991 etc. obtain the country rock ultrasonic velocity in tunnel, Zhu Xianzhuan ore deposit, the Huaibei have the understanding that is crest-trough-crest distributions; Square Zu Lie in 1996 etc. are distributions such as press-drawing-press at ore deposit, Jinchuan actual measurement roadway surrounding rock ess-strain.These phenomenons are all closely relevant with the subregion phenomenon of rupture.In recent years, domestic Lee's art ability and Xu Hongfa etc. utilize mine drilling television imager and ResiTest-4000 resistivity tester Different testing methods to monitor more typical subregion fracture phenomena respectively in the km deep-well tunnel country rock of Huainan; Zhang Chunsheng utilizes country rock ultrasonic investigation way to find also that at the silk screen power station dark auxiliary tunnel of 1500m subregion destroys the result.But the research that present deep tunnel country rock subregion breaks still is in the junior stage, and its generation mechanism is not clear.
Obviously, the subregion fracture phenomena is different by interior loosening rupture zone, plastic zone and the elastic region of being followed successively by outward with shallow workings country rock state, and is completely different with the resulting result of plane elastic-plastic analysis of superficial part rock mass mechanics.People are to the interested purpose of this phenomenon, not only be to obtain describing method to this phenomenon, but hope is by the research of this problem, can more deep understanding be arranged to rock mechanics behavior person's character, and can therefrom obtain the more rational way that tackles relevant underground works stable problem.But also not having preferably at present, experimental technique is used for subregion fracture research.
Summary of the invention
The objective of the invention is the problem that pin deep tunnel country rock subregion fracture technology exists, a kind of test method of obtaining thick wall cylinder sample ring fracture is provided.
Thick wall cylinder sample of the present invention obtains the experimental technique of circumferential separation:
A. at first test rock mass object is taken a sample;
B. the rock mass that sampling is obtained is made into wall thickness and the proportional thick wall cylinder sample of pore radius in it;
C. thick wall cylinder sample is placed in the airtight loading chamber of servo triaxial compression test machine, apply axial compression earlier, make sample and upper and lower rigidity load the end and closely contact;
D. to the endoporus of thick wall cylinder sample and the space oiling between cylinder sample and the loading chamber, until being full of fully;
E. thick wall cylinder sample is carried out interior pressure, confined pressure and three loadings of axial compression, until the design pressure value;
F. keep the xial feed of three-dimensional load constant, thick wall cylinder sample is unloaded, destroy until test specimen.
The ratio of described wall thickness and its interior pore radius is greater than 0.2; The described axial compression pressure that applies earlier is about 10MPa; Described design pressure value is that following three of pressure in the equal size, confined pressure condition load more than 70% of rock mass triaxial stress intensity when destroying.
Beneficial effect: be applicable to the experiment of simulation deep rock excavation project circumferential separation process, be not limited only to rock material, also can be used for simulating experiment as hard brittle material circumferential separation processes such as concrete.By loading and unloading the thick cyclinder test specimen is carried out three experiments, obtain the circumferential separation result of thick cyclinder test specimen, the subregion phenomenon of rupture that occurs when excavating to deep rock mass is similar, the corresponding measure that the subregion breakage problem that occurs when carrying out subregion fracture research thus and proposing solution deep rock mass excavation should be taked is for deep tunnel country rock subregion fracture research provides a kind of new approach.Gained result and the resulting roadway surrounding rock of superficial part rock mass mechanics are completely different by interior loosening rupture zone, plastic zone and plane, the elastic region elastic-plastic analysis result of being followed successively by outward.To rock particularly the person's character of the excavation relaxed rock mechanical behavior under the high stress of deep more deep understanding is arranged, obtain to tackle to descend more reasonable approach of engineering stability problem relatively to such an extent as to reach.Method is simple for this, and simulate effect is good, has practicality widely in the present technique field.
Description of drawings
Fig. 1 is that three of thick cyclinder test specimens of the present invention load synoptic diagram.
Fig. 2 is the vertical view of Fig. 1.
Among the figure: p
z-axial compression, p
2-confined pressure, p
1-interior pressure, the endoporus radius R
1
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
The test method of obtaining thick wall cylinder sample ring fracture of the present invention: adopt the rock drill that has concentric drill bit that test rock mass object is taken a sample earlier, rock sample is made into wall thickness of cylinder and its endoporus radius R
1Ratio greater than 0.2 thick wall cylinder sample, adopt then to comprise the axial compression system, the servo triaxial compression test machine of confined pressure system and interior pressing system is tested thick wall cylinder sample, the test approach is as follows:
Approach A: thick wall cylinder sample is placed in the airtight loading chamber of servo triaxial compression test machine, apply 10MPa axial compression p earlier
z, make sample and upper and lower rigidity load the end and closely contact, to the endoporus of thick wall cylinder sample and the space oiling between cylinder sample and the loading chamber,, thick wall cylinder sample is applied the interior p of pressure synchronously then until being full of fully
1, confined pressure p
2And axial compression p
z, make three to be loaded on the design pressure value, promptly the axle pressure value is to press p in the equal size
1, confined pressure p
2Three on rock loads more than 70% of rock triaxial stress intensity when destroying under the condition, makes thick wall cylinder sample top, bottom, inner hole wall, outer wall all be in pressured state, and keeps the xial feed of three-dimensional load constant, keeps axial compression p then
zWith confined pressure p
2Constant, press p in reducing
1, destroy until test specimen; If rock does not also destroy fully behind the interior pressure removal, then continue to reduce confined pressure again, finally destroy until test specimen.
Approach B: thick wall cylinder sample is placed in the airtight loading chamber of servo triaxial compression test machine, apply 10MPa axial compression p earlier
z, make sample and upper and lower rigidity load the end and closely contact, to the endoporus of thick wall cylinder sample and the space oiling between cylinder sample and the loading chamber,, earlier the thick cyclinder test specimen is applied axial compression p synchronously then until being full of fully
z, confined pressure p
2And the interior p that presses
1To the design pressure value, promptly the axle pressure value is to press p in the equal size
1, confined pressure p
2Three on rock loads more than 70% of rock triaxial stress intensity when destroying under the condition, keeps axial compression p then
zWith confined pressure p
2Constant, unload confined pressure p simultaneously
2With interior pressure p
1, destroy until test specimen.
Claims (4)
1. test method of obtaining thick wall cylinder sample ring fracture is characterized in that:
A. at first test rock mass object is taken a sample;
B. the rock mass that sampling is obtained is made into wall thickness and the proportional thick wall cylinder sample of pore radius in it;
C. thick wall cylinder sample is placed in the airtight loading chamber of servo triaxial compression test machine, apply axial compression (p earlier
z), make sample and upper and lower rigidity load the end and closely contact;
D. to the endoporus of thick wall cylinder sample and the space oiling between cylinder sample and the loading chamber, until being full of fully;
E. thick wall cylinder sample is carried out interior pressure (p
1), confined pressure (p
2) and axial compression (p
z) three spools loadings, until the design pressure value;
F. keep the xial feed of three-dimensional load constant, thick wall cylinder sample is unloaded, destroy until test specimen.
2. the test method of obtaining thick wall cylinder sample ring fracture according to claim 1 is characterized in that: described wall thickness and pore radius (R in it
1) ratio greater than 0.2.
3. the test method of obtaining thick wall cylinder sample ring fracture according to claim 1 is characterized in that: the described axial compression (p that applies earlier
z) pressure is about 10MPa.
4. the test method of obtaining thick wall cylinder sample ring fracture according to claim 1 is characterized in that: described design pressure value is for pressing (p in the equal size
1), confined pressure (p
2) more than 70% of following three triaxial stress of rock mass when load the destroying intensity of condition.
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| CNA2009100262535A CN101509852A (en) | 2009-03-18 | 2009-03-18 | Test methods for acquiring thick wall cylinder sample ring fracture |
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|---|---|---|---|
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| CN102221504A (en) * | 2011-04-14 | 2011-10-19 | 中国矿业大学 | Path loading method used in determination of rock triaxial strength after failure |
| CN102564855A (en) * | 2011-12-31 | 2012-07-11 | 长安大学 | Numerical method for graded crushed stone dynamic triaxial test |
| CN104237486A (en) * | 2014-10-10 | 2014-12-24 | 山东科技大学 | Mining fracturing simulating test device for sealing drilling |
| CN104614244A (en) * | 2015-02-13 | 2015-05-13 | 武汉科技大学 | High-stress roadway stability similarity simulation test device and method |
| CN104777047A (en) * | 2015-05-05 | 2015-07-15 | 中国矿业大学 | Testing method for measuring unloading strength of fractured rock |
| CN105181453A (en) * | 2015-08-10 | 2015-12-23 | 中国科学院武汉岩土力学研究所 | Test and analysis method of geotechnical media tension-shear strength |
| CN105675400A (en) * | 2016-01-15 | 2016-06-15 | 中国矿业大学(北京) | Test method for simulating unloading in excavation of mine workings |
| CN105865930A (en) * | 2016-04-11 | 2016-08-17 | 中南大学 | Test device for realizing loading and unloading of different stress paths in rock holes |
| CN107525541A (en) * | 2017-08-04 | 2017-12-29 | 中国矿业大学 | A kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig and method |
| CN108195689A (en) * | 2018-04-04 | 2018-06-22 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of thick cyclinder roadway surrounding rock destroys and supporting analogue experiment method and device |
| CN110006742A (en) * | 2019-04-10 | 2019-07-12 | 三峡大学 | A kind of triaxial test pressure chamber of analog underground chamber and tunnel excavation off-load and supporting |
| CN111829888A (en) * | 2019-10-11 | 2020-10-27 | 华中科技大学 | Mechanical property experiment method of material for electromagnetic forming |
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|---|---|---|---|---|
| CN102221504B (en) * | 2011-04-14 | 2012-09-05 | 中国矿业大学 | Path loading method used in determination of rock triaxial strength after failure |
| CN102221504A (en) * | 2011-04-14 | 2011-10-19 | 中国矿业大学 | Path loading method used in determination of rock triaxial strength after failure |
| CN102564855A (en) * | 2011-12-31 | 2012-07-11 | 长安大学 | Numerical method for graded crushed stone dynamic triaxial test |
| CN104237486B (en) * | 2014-10-10 | 2016-08-17 | 山东科技大学 | A kind of closing boring Mining failure simulation test device |
| CN104237486A (en) * | 2014-10-10 | 2014-12-24 | 山东科技大学 | Mining fracturing simulating test device for sealing drilling |
| CN104614244A (en) * | 2015-02-13 | 2015-05-13 | 武汉科技大学 | High-stress roadway stability similarity simulation test device and method |
| CN104614244B (en) * | 2015-02-13 | 2017-04-12 | 武汉科技大学 | High-stress roadway stability similarity simulation test device and method |
| CN104777047A (en) * | 2015-05-05 | 2015-07-15 | 中国矿业大学 | Testing method for measuring unloading strength of fractured rock |
| CN105181453A (en) * | 2015-08-10 | 2015-12-23 | 中国科学院武汉岩土力学研究所 | Test and analysis method of geotechnical media tension-shear strength |
| CN105181453B (en) * | 2015-08-10 | 2018-04-10 | 中国科学院武汉岩土力学研究所 | Rock soil medium tensile-sbear strength method for testing and analyzing |
| CN105675400A (en) * | 2016-01-15 | 2016-06-15 | 中国矿业大学(北京) | Test method for simulating unloading in excavation of mine workings |
| CN105675400B (en) * | 2016-01-15 | 2019-01-22 | 中国矿业大学(北京) | Simulate the test method that roadway excavates off-load |
| CN105865930A (en) * | 2016-04-11 | 2016-08-17 | 中南大学 | Test device for realizing loading and unloading of different stress paths in rock holes |
| CN105865930B (en) * | 2016-04-11 | 2018-06-29 | 中南大学 | A kind of experimental rig realized in rock pore different stress paths and add off-load |
| CN107525541A (en) * | 2017-08-04 | 2017-12-29 | 中国矿业大学 | A kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig and method |
| CN108195689A (en) * | 2018-04-04 | 2018-06-22 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of thick cyclinder roadway surrounding rock destroys and supporting analogue experiment method and device |
| CN110006742A (en) * | 2019-04-10 | 2019-07-12 | 三峡大学 | A kind of triaxial test pressure chamber of analog underground chamber and tunnel excavation off-load and supporting |
| CN111829888A (en) * | 2019-10-11 | 2020-10-27 | 华中科技大学 | Mechanical property experiment method of material for electromagnetic forming |
| CN111829888B (en) * | 2019-10-11 | 2021-07-27 | 华中科技大学 | Mechanical property experiment method of material for electromagnetic forming |
| US11761864B2 (en) | 2021-12-17 | 2023-09-19 | Saudi Arabian Oil Company | Thick-wall cylinder experiment setup for wellbore stability analysis |
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Open date: 20090819 |