CN107091623A - Tunnel surrounding relaxation zone THICKNESS CALCULATION method - Google Patents
Tunnel surrounding relaxation zone THICKNESS CALCULATION method Download PDFInfo
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- CN107091623A CN107091623A CN201710165708.6A CN201710165708A CN107091623A CN 107091623 A CN107091623 A CN 107091623A CN 201710165708 A CN201710165708 A CN 201710165708A CN 107091623 A CN107091623 A CN 107091623A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
Tunnel surrounding relaxation zone THICKNESS CALCULATION method of the present invention.By introducing fractured rock integrity factor RvWith relaxation zone integrity factor LvConcept, the rock crushing state of wall rock loosening ring is quantified.Value is defined in the quantization for drawing relaxation zone thickness using the laboratory test of rock, then in conjunction with sonic method site testing data, judges the thickness of wall rock loosening ring.Formation basic theory and substantially of the present invention from relaxation zone, the discrimination standard formulated in this approach are objective, true, with generality and generalization.
Description
Technical field
The present invention relates to a kind of quantization method for determining tunnel surrounding relaxation zone thickness, and in particular to a kind of tunnel surrounding pine
Moving-coil THICKNESS CALCULATION method.
Background technology
During tunnel excavation, country rock virgin state of stress destroys to form secondary state of stress generation stress concentration phenomenon, now can
" crushed zone " around tunnel is formed, traditionally referred to as wall rock loosening ring.The determination of wall rock loosening ring thickness is to tunnel
Excavation and support design for it is particularly significant, be tunnel safety construction guarantee.
It is actual on the main elastic plastic theory calculating of determination method of relaxation zone thickness, numerical simulation analysis, scene at present
Test.On-the-spot test can more really react actual conditions for theoretical calculation and numerical analysis.In numerous surveys
It is the most ripe with the application of sonic test method in method for testing, though this method is with technology maturation, precision is high, cost is low, be easy to operation
And be widely adopted, but what kind of criterion to define wall rock loosening ring thickness according on sound wave curve figure, fail to set up all the time
Unified standard.At present one three kinds of discrimination standards are had in this problem：Made with the point that country rock acoustic velocity starts to be significantly increased
To differentiate the foundation of relaxation zone thickness；The hole depth of corresponding point after end, as wall rock loosening is significantly increased in country rock acoustic velocity
The thickness of circle；The median point of starting point and terminal when country rock acoustic velocity is significantly increased is used as differentiation point.Three of the above method
General character drawback be exactly that subjectivity is larger, obscure, be theoretically unsound.Therefore, it is necessary to find a kind of processing method of science.
The content of the invention
It is an object of the invention to provide a kind of tunnel surrounding relaxation zone THICKNESS CALCULATION method, drawn based on rock indoor experiment
The thickness of tunnel surrounding relaxation zone.
The technical solution adopted in the present invention is：
Tunnel surrounding relaxation zone THICKNESS CALCULATION method, it is characterised in that：
Value is defined in the quantization for drawing relaxation zone thickness using the laboratory test of rock, then in conjunction with sonic method on-the-spot test feelings
Condition, judges the thickness of wall rock loosening ring.
Specifically include following steps：
The first step：Prepare rock test test block；
Second step：Rock indoor is tested：
Introduce two parameters：Fractured rock integrity factor RvWith relaxation zone integrity factor Lv；
In formula:Rv- fractured rock integrity factor；
vpr- fractured rock velocity of longitudinal wave；
vwr- intact rock velocity of longitudinal wave；
Intact rock velocity of longitudinal wave v is gone out by sonic test system testingwr；Uniaxial compression test is carried out to rock, by rock
Stone is compressed to broken state；Test fractured rock velocity of longitudinal wave vpr；Fractured rock integrity factor R is drawn according to formula (1)v；
In formula:Lv- relaxation zone integrity factor；
vpt- relaxation zone rock mass velocity of longitudinal wave；
vyt- virgin rock velocity of longitudinal wave；
It is approximately considered relaxation zone integrity factor and is equal to fractured rock integrity factor, i.e.,：
Rv≈Lv (3)
Formula (3) is brought into formula (2) and obtained：
Virgin rock velocity of longitudinal wave v is drawn by wall rock loosening ring sonic test methodyt, in conjunction with broken fractured rock integrality
Coefficients Rv, relaxation zone rock mass velocity of longitudinal wave v is drawn using formula (4)pt；
3rd step：V is found out finally according to hole depth-velocity of wave curve map obtained by the test of live relaxation zone sonic methodptIt is corresponding
Position, as wall rock loosening ring position.
The present invention has advantages below：
The present invention show that value is defined in the quantization of relaxation zone thickness using the laboratory test of rock, then in conjunction with sonic method scene
Test case, judges the thickness of wall rock loosening ring, from formation basic theory and the substantially of relaxation zone, is tested with rock indoor
Based on draw fractured rock integrity factor Rv, the discrimination standard formulated in this approach is objective, true, with generality with
Generalization.
Brief description of the drawings
Fig. 1 is rock test test block.
Fig. 2 is the nonmetallic sonic test instrument of RSM-SY5 (T).
Fig. 3 is waitd upon for microcomputer controlled electro-hydraulic and is taken universal testing machine.
Fig. 4 is intact rock wave velocity testing figure.
Fig. 5 is rock compressed failure test.
Fig. 6 is fractured rock wave velocity testing figure.
Fig. 7 is relaxation zone testing tool.
Fig. 8 is relaxation zone gaging hole artwork.
Fig. 9 is the first test section hole depth-velocity of wave curve map.
Figure 10 is the second test section hole depth-velocity of wave curve map.
Embodiment
With reference to embodiment, the present invention will be described in detail.
Based on rock indoor is tested, two parameters are introduced：Fractured rock integrity factor RvWith relaxation zone integrality
Coefficient Lv。
In formula:Rv- fractured rock integrity factor
vpr- fractured rock velocity of longitudinal wave
vwr- intact rock velocity of longitudinal wave
In formula:Lv- relaxation zone integrity factor
vpt- relaxation zone rock mass velocity of longitudinal wave
vyt- virgin rock velocity of longitudinal wave
Because relaxation zone is substantially exactly one " relaxation crushed zone ".Mainly due to the formed secondary stress of excavation
, stress concentration phenomenon is generated, when concentrated stress is more than rock mass strength, rock crushing.Approximately it can think that relaxation zone is complete
Whole property coefficient is equal to fractured rock integrity factor, i.e.,：
Rv≈Lv (3)
Formula (3) is brought into formula (2) and can obtained：
The longitudinal wave velocity v of relaxation zone position rock mass can be tried to achievept.Further according to the hole obtained by live relaxation zone acoustic emission test
Depth-velocity of wave curve map finds out vptThe position of corresponding position, as wall rock loosening ring.
Specific implementation：
The first step：Rock test test block is prepared, the preparation of test block should be met《Standard for test methods of engineering rock masses》.
Second step：Rock indoor is tested.
1) go out the ultrasonic wave longitudinal wave velocity of intact rock by sonic test system testing, draw vwr。
2) uniaxial compression test is carried out to rock, by rock compressed to broken state.
3) the rock longitudinal wave velocity v tested after crushingpr。
4) fractured rock integrity factor R is drawn according to formula (1)v
3rd step：The longitudinal wave velocity v of virgin rock can be drawn by wall rock loosening ring sonic test methodyt, in conjunction with
Fractured rock integrity factor R obtained by two stepsv, the longitudinal wave velocity v of relaxation zone position rock mass just can be drawn using formula (4)pt。
V is found out finally according to hole depth-velocity of wave curve map obtained by the test of live relaxation zone sonic methodptCorresponding position, as country rock
The position of relaxation zone.
Embodiment：
Certain tunnel surrounding is mainly made up of based on gneiss feldspar, quartz, middle coarse grain blastic texture.
1) rock indoor is tested
The collection experiment rock specimens used at wall rock loosening ring test position, the section belongs to III grade of country rock, dries gentle breeze
Gneiss, rock integrity is preferably without obvious crack, and rock strength is higher.Because rock is a kind of natural uneven material
Material, in order to prevent test data discreteness is excessive from choosing the construction rock test block close with occurrence.According to《Engineering rock mass experiment side
Method standard》It is made diameter 50mm, height 100mm cylinder test block, 10 pieces altogether, as shown in Figure 1.
Using the produced nonmetallic sonic test systems (precision 0.01km/s) of RSM-SY5 (T) are ground in Wuhan, test is tried
The ripple compressional wave speed of part.The microcomputer controlled electro-hydraulic produced with Shaoxing Kente Mechanical ＆ Electrical Co., Ltd., which is waitd upon, takes universal testing machine (amount
Journey 1000KN), the uniaxial compressive test of rock is done, shown in test apparatus as Fig. 2,3.
Test intact rock ultrasonic wave longitudinal wave velocity：Rock test block is taken out, is made in two sections of uniform vaseline of smearing of its test block
For couplant；Sonic test system is assembled, sonic test probe is connected with main frame and test parameter is modulated；By acoustic emission
Probe is placed in the two ends of test specimen axis with receiving probe, applies pressure slightly, then starts test, as shown in Figure 4.
Compression test of rock：Test block is placed in testing machine bearing plate center, the position of Adjustment Tests machine bearing plate makes test specimen
Two ends are uniformly contacted with lower platen on testing machine.With 0.5Mpa per second speed loading until test specimen is destroyed, as shown in Figure 5.
Test fractured rock ultrasonic wave longitudinal wave velocity：The test block after crushing is removed, test block both sides are uniformly smeared and use all scholars
Woods is used as coupling, then tests fractured rock longitudinal wave velocity with sonic test instrument, as shown in Figure 6.
Above test result is shown in Table 1.
The fractured rock integrity factor R of table 1vTest result table
Note：N- rock uniaxiality strengths
So far, fractured rock integrity factor RvJust it can draw, try to achieve Rv=0.53.
2) sonic method wall rock loosening ring on-the-spot test
Using single-hole sound-wave method, this time test instrument used to grind RSM-SY5 (T) cement bond logging of science and technology development in Wuhan
Test system.Mainly include：Double probe, push guide rod, water pump, the data received of RSM-SY5 (T) nonmetallic sonic wave detector, a hair are passed
Other aids such as defeated line, details are shown in Fig. 7.
This have chosen the test job that 2 sections carry out wall rock loosening ring altogether, and each test section chooses four surveys
Pilot, respectively at left and right haunch and spandrel.Hole depth 4m, aperture 40mm, test sketch is as shown in Figure 8.
Test one is divided into five steps：4. 3. probe feeding gaging hole is closed gaging hole by the 2. borehole cleaning that 1. drills, and 5. water filling coupling moves
Dynamic measuring staff, starts test.Measuring staff is pulled out into 0.5m outward every time, test is completed until all removing.
The rock mass longitudinal wave velocity at different depth is tested out, test result is shown in Table 2.
The rock mass velocity test result table of table 2
Note：Rock mass velocity unit K m/s
Test result is depicted as hole depth-velocity of wave curve map, as shown in Figures 9 and 10.Rock mass velocity can be found by Fig. 9 and 10
Gradually increase with the increase of hole depth, this be due to the increase country rock of depth by the influence excavated less and less, rock mass
Degree of crushing be also gradually to reduce.Meanwhile, about rock mass velocity tends towards stability substantially at 2m, show the disturbance that is subject to herein compared with
It is small, can be approximately regard country rock herein as original country rock.The average value of rock mass velocity stable section is taken as virgin rock compressional wave
Speed vyt。
3) wall rock loosening ring thickness judges
Fractured rock integrity factor R has been drawn by (1) step and (2) step respectivelyvWith virgin rock velocity of longitudinal wave vyt,
Being brought into formula (4) just can try to achieve the longitudinal wave velocity v of relaxation zone position rock masspt.Further according to live relaxation zone acoustic emission test
The velocity of wave of gained-hole depth curve map finds out vptThe position of corresponding position, as wall rock loosening ring, is shown in Table 3.
The relaxation zone THICKNESS CALCULATION table of table 3
Present disclosure is not limited to cited by embodiment, and those of ordinary skill in the art are by reading description of the invention
And any equivalent conversion taken technical solution of the present invention, it is that claim of the invention is covered.
Claims (2)
1. tunnel surrounding relaxation zone THICKNESS CALCULATION method, it is characterised in that：
Value is defined in the quantization for drawing relaxation zone thickness using the laboratory test of rock, then in conjunction with sonic method site testing data,
Judge the thickness of wall rock loosening ring.
2. tunnel surrounding relaxation zone THICKNESS CALCULATION method according to claim 1, it is characterised in that：
Specifically include following steps：
The first step：Prepare rock test test block；
Second step：Rock indoor is tested：
Introduce two parameters：Fractured rock integrity factor RvWith relaxation zone integrity factor Lv；
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In formula:Rv- fractured rock integrity factor；
vpr- fractured rock velocity of longitudinal wave；
vwr- intact rock velocity of longitudinal wave；
Intact rock velocity of longitudinal wave v is gone out by sonic test system testingwr；Uniaxial compression test is carried out to rock, by rock pressure
It is reduced to broken state；Test fractured rock velocity of longitudinal wave vpr；Fractured rock integrity factor R is drawn according to formula (1)v；
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In formula:Lv- relaxation zone integrity factor；
vpt- relaxation zone rock mass velocity of longitudinal wave；
vyt- virgin rock velocity of longitudinal wave；
It is approximately considered relaxation zone integrity factor and is equal to fractured rock integrity factor, i.e.,：
Rv≈Lv (3)
Formula (3) is brought into formula (2) and obtained：
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Virgin rock velocity of longitudinal wave v is drawn by wall rock loosening ring sonic test methodyt, in conjunction with broken fractured rock integrity factor
Rv, relaxation zone rock mass velocity of longitudinal wave v is drawn using formula (4)pt；
3rd step：V is found out finally according to hole depth-velocity of wave curve map obtained by the test of live relaxation zone sonic methodptCorresponding position
Put, as the position of wall rock loosening ring.
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| CN109239779A (en) * | 2018-11-08 | 2019-01-18 | 中国建筑第二工程局有限公司 | A kind of test method of tunnel surrounding relaxation zone and the stage division of rock convergence measure |
| CN109471169A (en) * | 2018-11-07 | 2019-03-15 | 中国铁路设计集团有限公司 | A kind of Rock Mass Integrality evaluation method based on seismic refraction method |
| CN109870229A (en) * | 2019-03-08 | 2019-06-11 | 长江水利委员会长江科学院 | Wall Rock of Tunnel velocity of wave and relaxation zone thickness testing device and method |
| CN111751032A (en) * | 2020-06-30 | 2020-10-09 | 中国石油天然气集团有限公司 | Ultrasonic method stress measurement method based on array probe |
| CN111879856A (en) * | 2020-08-31 | 2020-11-03 | 福州大学 | High-stress soft rock tunnel loosening ring ultrasonic testing acoustic coupling method |
| CN112611805A (en) * | 2020-12-11 | 2021-04-06 | 武汉理工大学 | Method for evaluating surrounding rock loosening ring range based on attenuation coefficient |
| CN112923879A (en) * | 2021-02-04 | 2021-06-08 | 中水北方勘测设计研究有限责任公司 | Method for evaluating relaxation thickness and grade of surrounding rock of cavern by utilizing sound wave speed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109471169A (en) * | 2018-11-07 | 2019-03-15 | 中国铁路设计集团有限公司 | A kind of Rock Mass Integrality evaluation method based on seismic refraction method |
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| CN111879856A (en) * | 2020-08-31 | 2020-11-03 | 福州大学 | High-stress soft rock tunnel loosening ring ultrasonic testing acoustic coupling method |
| CN112611805A (en) * | 2020-12-11 | 2021-04-06 | 武汉理工大学 | Method for evaluating surrounding rock loosening ring range based on attenuation coefficient |
| CN112611805B (en) * | 2020-12-11 | 2024-04-05 | 武汉理工大学 | Method for evaluating surrounding rock loose coil range based on attenuation coefficient |
| CN112923879A (en) * | 2021-02-04 | 2021-06-08 | 中水北方勘测设计研究有限责任公司 | Method for evaluating relaxation thickness and grade of surrounding rock of cavern by utilizing sound wave speed |
| CN112923879B (en) * | 2021-02-04 | 2022-06-21 | 中水北方勘测设计研究有限责任公司 | Method for evaluating relaxation thickness and grade of surrounding rock of cavern by utilizing sound wave speed |
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