CN104931403B - Anisotropic rock degree of injury test device and its test method - Google Patents

Anisotropic rock degree of injury test device and its test method Download PDF

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Publication number
CN104931403B
CN104931403B CN201510320304.0A CN201510320304A CN104931403B CN 104931403 B CN104931403 B CN 104931403B CN 201510320304 A CN201510320304 A CN 201510320304A CN 104931403 B CN104931403 B CN 104931403B
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rock sample
circumferential
axial
rock
gas
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CN201510320304.0A
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Chinese (zh)
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CN104931403A (en
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刘宁
倪绍虎
房敦敏
吴关叶
朱红波
周晓明
王恒乐
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中国电建集团华东勘测设计研究院有限公司
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Abstract

The present invention relates to a kind of anisotropic rock degree of injury test device and its test methods.The object of the present invention is to provide a kind of anisotropic rock degree of injury test device simple in structure, easy to operate, lower-cost and its test methods, directly to measure the gas permeability of damage rock different directions.The technical scheme is that:The device is used to test the circumferential gas permeability coefficient and axial gas infiltration coefficient of rock sample, device includes the axial pressurizing device of axial to rock sample and circumferential pressurization and circumferential pressue device, there is central bore among rock sample, the device also has pressurization disk, closed sleeve, force (forcing) pump, tank, pressure gauge and buret, the closed sleeve coaxial with rock sample is cased on rock sample, it is lined with pressurization disk between the upper and lower ends and axial pressurizing device of rock sample, force (forcing) pump is connected to rock sample lower end through air inlet pipe, rock sample upper end is connected to through escape pipe and buret in tank successively, pressure gauge is connected on escape pipe.The present invention is suitable for underground engineering field.

Description

Anisotropic rock degree of injury test device and its test method

Technical field

The present invention relates to a kind of anisotropic rock degree of injury test device and its test methods.Suitable for underground engineering Field.

Background technology

Since the secondary adjustment country rock of stress can be damaged after Underground Engineering Excavation, especially present deep underground rock Lapicide's journey is on the increase, and buried depth is increasing, and the contradiction between crustal stress and rock mass strength is more and more sharp, leads to the damage of country rock Hinder degree also to continue to increase, the presence of damage will directly influence the mechanical property of rock itself, and then influence underground engineering Monolithic stability.

Stress damage in rock is expendable, and the internal structure of rock can be caused to generate permanent change Change, these variations will cause the physico mechanical characteristic of rock to change, these variations can be measured directly, such as crack number Statistics, sonic test, acoustic emission monitor(ing), CT scan, permeability test etc..These test methods obtain in engineering practice It promotes and applies, but since rock generally has anisotropic character, causes above-mentioned measurement that can only reflect an overall impairment Degree is particularly due to the anisotropic character that stress damage will aggravate rock, and test achievement is caused to rest on mostly qualitatively Angle is unable to judge accurately damage accurate degree of injury caused by rock.

Invention content

The technical problem to be solved by the present invention is to:In view of the above problems, a kind of simple in structure, operation side is provided Just, lower-cost anisotropic rock degree of injury test device and its test method are different directly to measure damage rock The gas permeability in direction.

The technical solution adopted in the present invention is:A kind of anisotropic rock degree of injury test device, for testing rock The circumferential gas permeability coefficient and axial gas infiltration coefficient of sample, the device include that the axial direction of axial to rock sample and circumferential pressurization adds Pressure device and circumferential pressue device, rock sample centre have central bore, it is characterised in that:The device also has pressurization disk, closed Sleeve, force (forcing) pump, tank, pressure gauge and buret, are cased with the closed sleeve coaxial with rock sample on the rock sample, rock sample it is upper Lower to be lined with pressurization disk between both ends and axial pressurizing device, the force (forcing) pump is connected to rock sample lower end through air inlet pipe, rock sample upper end according to It is secondary to be connected in tank through escape pipe and buret, pressure gauge is connected on escape pipe;

When testing circumferential gas permeability coefficient, the pressurization disk is seal disc, and the seal disc in rock sample upper end adds with axial Filling top hole dielectric layer between pressure device, fills lateral apertures dielectric layer, and lateral apertures between closed sleeve and rock sample It is connected with top hole dielectric layer at the top of dielectric layer;The gas outlet of the air inlet pipe passes through the seal disc of rock sample lower end to be connected to The central bore of rock sample, escape pipe air inlet connection top hole dielectric layer;

When testing axial gas infiltration coefficient, the pressurization disk is ventilation platen, and silicon is filled between closed sleeve and rock sample Glue sealant, the central bore of the rock sample is interior to fill silica gel;The ventilation pressure of the gas outlet connection rock sample lower end of the air inlet pipe Disk, the ventilation platen of escape pipe air inlet connection upper end.

The top hole dielectric layer and lateral apertures dielectric layer are filled by the good grains of sand of grading to be formed.

A kind of method that application apparatus is tested, it is characterised in that steps are as follows:

1, coring:Core is taken out in Excavation damage zone, and is drilled therebetween, as rock sample;

2, circumferential gas permeability coefficient test:

2.1, rock sample is packed into corresponding intrument;

2.2, axial pressurizing device and circumferential pressue device are forced into setting value to rock sample;

2.3, it opens force (forcing) pump and is passed through nitrogen in the central bore of rock sample;

2.3, real-time recording manometer and buret reading;

3, axial gas infiltration coefficient is tested:

3.1, silica gel is filled in rock sample central bore;

3.2, rock sample is packed into corresponding intrument;

3.3, axial pressurizing device and circumferential pressue device are forced into setting value to rock sample;

3.4, it opens force (forcing) pump and injects nitrogen in the central bore of rock sample;

3.5, real-time recording manometer and buret reading;

4, as follows according to recorded and infiltration coefficient calculation formula calculation permeability coefficient, calculation formula:

In formula, K is infiltration coefficient (m2), Q is gas flow rate (m3/ s), μ is gas viscosity (Pas), and L is experiment rock Sample length (m), A are the area of section (m of rock sample2), P0It is injection gas pressure (Pa) for atmospheric pressure (Pa), P.

5, settling time-infiltration coefficient, circumferential pressure-circumferential direction infiltration coefficient, axial compressive force-axial dispersion coefficient expression are closed It is formula.

The nitrogen pressure of injection is 0.2MPa, and load circumferential pressure is 2~30MPa, and axial compressive force pressure is less than uniaxial compressive The 60% of intensity, a testing time are 3~4 days.

Coring boring direction is vertical with structural plane.

The rock sample size is 200 × 100mm, and bore size is 100 × 50mm.

The beneficial effects of the invention are as follows:It is the configuration of the present invention is simple, easy to operate, the gas permeability coefficient measured is converged Always, obtain different circumferential pressures, axially different pressure, different time infiltration coefficient, and respectively settling time-infiltration coefficient, Circumferential pressure-circumferential direction infiltration coefficient, axial compressive force-axial dispersion coefficient express relational expression, disclose infiltration coefficient drilling at any time The influence of change relationship and pressure to infiltration coefficient is damage journey of the anisotropic rock under different time, different stress conditions Degree judges to provide most direct experimental data.The present invention directly evaluates the degree of injury of rock, can reflect rock it is each to Anisotropic feature, experimental provision are simple, easily operated, it is only necessary to are transformed to existing loading equipemtn, save laboratory apparatus and throw Money, and can be recycled and later stage other type experiments.

Description of the drawings

Fig. 1 is the schematic device that circumferential gas permeability coefficient is tested in embodiment.

Fig. 2 is the schematic device that axial gas infiltration coefficient is tested in embodiment.

Specific implementation mode

The present embodiment is a kind of anisotropic rock degree of injury test device, including axial pressurizing device 3, circumferential pressurization Device 2, pressurization disk, closed sleeve 13, force (forcing) pump 4, into and out of tracheae 5,6, tank 8, pressure gauge 9 and buret 7, the device It can be respectively used to the circumferential gas permeability coefficient and axial gas infiltration coefficient of test rock sample 1 (with central bore 101).

Fig. 1 is the test device of the circumferential gas permeability coefficient for testing rock sample 1, and rock sample 1 is placed in circumferential pressue device 2 Interior, circumferential pressue device applies circumferential pressure to rock sample, and 1 upper and lower ends of rock sample are equipped with axial pressurizing device 3, applies axis for rock sample To pressure.This example is equipped with pressurization disk between rock sample lower end and axial pressurizing device, between rock sample upper end and axial pressurizing device It is sequentially provided with pressurization disk and top hole dielectric layer 11, pressurization disk is using close in circumferential device for testing permeability coefficient Closing disk 10 prevents gas from being leaked from 1 both ends of rock sample.The closed sleeve 13 coaxially arranged with rock sample there are one sets on rock sample 1, Lateral apertures dielectric layer 12 is set in the gap between closed sleeve 13 and rock sample, lateral apertures dielectric layer top 12 and top Pore media layer 11 is connected.Force (forcing) pump 4 connects air inlet pipe 5, and the gas outlet of air inlet pipe passes through the seal disc 10 of rock sample lower end It is connected to the central bore 101 of rock sample, top hole dielectric layer 11 is connected in tank 8 through escape pipe 6 and buret 7, goes out successively Tracheae 6 is equipped with pressure gauge 9.Top hole dielectric layer 11 and lateral apertures dielectric layer 12 fill shape by the good grains of sand of grading At being conducive to the transmission of stress and the flowing of gas.Top hole dielectric layer 11 and lateral apertures dielectric layer 12 form one Enter from bottom, both sides are overflowed, and the circumferential air ventilation passage finally flowed out from top can directly test the circumferential direction of rock sample 1 Gas permeability coefficient.

Fig. 2 is the test device of the axial gas infiltration coefficient for testing rock sample 1, and rock sample 1 is placed in circumferential pressue device 2 Interior, circumferential pressue device applies circumferential pressure to rock sample, and 1 upper and lower ends of rock sample are equipped with axial pressurizing device 3, applies axis for rock sample To pressure.Pressurization disk is equipped between rock sample upper/lower terminal and axial pressurizing device 3, in axial dispersion coefficient testing device Pressurization disk is conducive to the transmission of stress and the flowing of gas using ventilation platen 15, ventilation platen 15.In rock sample 1 in the present embodiment Upper set is there are one the closed sleeve 13 coaxially arranged with rock sample, and setting silica gel is close in the gap between closed sleeve 13 and rock sample Sealing 14 (is filled by silica gel and is formed), prevents gas from being overflowed from side;Silica gel is filled in the central bore 101 of rock sample 1.The dress It sets middle force (forcing) pump 4 and connects air inlet pipe 5, the ventilation platen 15 of the gas outlet connection rock sample lower end of air inlet pipe, the ventilation of rock sample upper end Platen 15 is connected to through escape pipe 6 and buret 7 in tank 8 successively, and escape pipe 6 is equipped with pressure gauge 9.Ventilation platen 15 and silicon Glue sealant 14 forms an axial gas circulation passage for entering from rock sample bottom, being flowed out at the top of rock sample, can directly test The axial gas infiltration coefficient of rock sample 1.

The test method of the present embodiment is as follows:

1, coring:Core is taken out in Excavation damage zone, core size is greater than 100 × 50mm, it is proposed that size be 200 × 100mm, to facilitate the processing in later stage.Coring boring direction is preferably vertical with structural plane holding, to reduce structural plane to rock object Manage the influence of mechanical characteristic.200 × 100mm cores of taking-up are drilled in centre, bore size is 100 × 50mm, is made For rock sample 1;

2, circumferential gas permeability coefficient test:

2.1, rock sample 1 is packed into the test device of circumferential gas permeability coefficient;

2.2, axial pressurizing device 3 and circumferential pressue device 2 are forced into setting value to rock sample 1;

2.3, it opens force (forcing) pump 4 and injects nitrogen in the central bore 101 of rock sample 1;

2.3, real-time recording manometer 9 and buret 7 are read;

3, axial gas infiltration coefficient is tested:

3.1, silica gel is filled in rock sample central bore 101;

3.2, rock sample 1 is packed into the test device of axial gas infiltration coefficient;

3.3, axial pressurizing device 3 and circumferential pressue device 2 are forced into setting value to rock sample;

3.4, it opens force (forcing) pump 4 and injects nitrogen in the central bore of rock sample;

3.5, real-time recording manometer 9 and buret 7 are read;

4, as follows according to recorded and infiltration coefficient calculation formula calculation permeability coefficient, calculation formula:

In formula, K is infiltration coefficient (m2), Q is gas flow rate (m3/ s) (being calculated by the data of step 2,3 records), μ For gas viscosity (Pas), L is experiment rock sample length (m), and A is the area of section (m of rock sample2), P0For atmospheric pressure (Pa), P is injection gas pressure (Pa).

5, settling time-infiltration coefficient, circumferential pressure-circumferential direction infiltration coefficient, axial compressive force-axial dispersion coefficient expression are closed It is formula.

The nitrogen pressure injected in the present embodiment is 0.2MPa, and load circumferential pressure is 2~30MPa, and axial compressive force pressure is not More than the 60% of uniaxial compressive strength, one time testing time is 3~4 days.

Claims (5)

1. a kind of anisotropic rock degree of injury test device, circumferential gas permeability coefficient and axis for testing rock sample (1) To gas permeability coefficient, which includes the axial pressurizing device (3) of axial to rock sample and circumferential pressurization and circumferential pressue device (2), there is central bore (101) among rock sample, it is characterised in that:The device also has pressurization disk, closed sleeve (13), pressurization It pumps (4), into and out of tracheae (5,6), tank (8), pressure gauge (9) and buret (7), is cased on the rock sample (1) same with rock sample The closed sleeve (13) of axis, is lined with pressurization disk between the upper and lower ends and axial pressurizing device of rock sample, the force (forcing) pump (4) through into Tracheae (5) is connected to rock sample lower end, and rock sample upper end is connected to through escape pipe (6) and buret (7) in tank (8) successively, escape pipe On be connected to pressure gauge (9);
When testing circumferential gas permeability coefficient, the pressurization disk is seal disc (10), and the seal disc in rock sample upper end adds with axial Filling top hole dielectric layer (11) between pressure device fills lateral apertures dielectric layer (12) between closed sleeve and rock sample, and (12) are connected with top hole dielectric layer (11) at the top of lateral apertures dielectric layer;The gas outlet of the air inlet pipe (5) passes through The central bore of seal disc (10) the connection rock sample of rock sample lower end, escape pipe (6) air inlet connection top hole dielectric layer (11);
When testing axial gas infiltration coefficient, the pressurization disk is ventilation platen (15), and silicon is filled between closed sleeve and rock sample Glue sealant (14), the central bore (101) of the rock sample is interior to fill silica gel;The gas outlet of the air inlet pipe (5) is connected to rock sample The ventilation platen (15) of lower end, the ventilation platen (15) of escape pipe (6) air inlet connection upper end;
The top hole dielectric layer (11) and lateral apertures dielectric layer (12) are filled by the good grains of sand of grading to be formed.
2. a kind of method tested using claim 1 described device, it is characterised in that steps are as follows:
2.1, coring:Core is taken out in Excavation damage zone, and is drilled therebetween, as rock sample (1);
2.2, circumferential gas permeability coefficient test:
2.2.1 rock sample (1), is packed into corresponding intrument;
2.2.2, axial pressurizing device (3) and circumferential pressue device (2) are forced into setting value to rock sample (1);
2.2.3 it, opens force (forcing) pump (4) and injects nitrogen in the central bore (101) of rock sample (1);
2.2.4, real-time recording manometer (9) and buret (7) reading;
2.3, axial gas infiltration coefficient is tested:
2.3.1 silica gel, is filled in rock sample central bore (101);
2.3.2 rock sample (1), is packed into corresponding intrument;
2.3.3, axial pressurizing device (3) and circumferential pressue device (2) are forced into setting value to rock sample;
2.3.4 it, opens force (forcing) pump (4) and injects nitrogen in the central bore of rock sample;
2.3.5, real-time recording manometer (9) and buret (7) reading;
2.4, as follows according to recorded and infiltration coefficient calculation formula calculation permeability coefficient, calculation formula:
In formula, K is infiltration coefficient (m2), Q is gas flow rate (m3/ s), μ is gas viscosity (Pas), and L is that experiment rock sample is long It spends (m), A is the area of section (m of rock sample2), P0It is injection gas pressure (Pa) for atmospheric pressure (Pa), P;
2.5, settling time-infiltration coefficient, circumferential pressure-circumferential direction infiltration coefficient, axial compressive force-axial dispersion coefficient relationship between expression Formula.
3. according to the method described in claim 2, it is characterized in that:The nitrogen pressure of injection is 0.2MPa, loads circumferential pressure For 2~30MPa, 60% of axial compressive force pressure less than uniaxial compressive strength, a testing time is 3~4 days.
4. method according to claim 2 or 3, it is characterised in that:Coring boring direction is vertical with structural plane.
5. according to the method described in claim 4, it is characterized in that:Rock sample (1) size is 200 × 100mm, bore size For 100 × 50mm.
CN201510320304.0A 2015-06-11 2015-06-11 Anisotropic rock degree of injury test device and its test method CN104931403B (en)

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Publication number Priority date Publication date Assignee Title
CN106769769B (en) * 2017-01-05 2020-02-14 中国石油大学(北京) Rock pressurization imbibition device
CN106841000B (en) * 2017-01-12 2019-12-27 四川大学 Sample assembly for radial permeability test of ultra-low permeability rock and test method thereof

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CN1837774A (en) * 2006-04-20 2006-09-27 中国科学院武汉岩土力学研究所 Apparatus for testing permeability coefficient of low-permeability rock medium
CN103063557A (en) * 2012-12-31 2013-04-24 河海大学 Device and method for detecting gas permeability of rock
CN104596905A (en) * 2014-12-31 2015-05-06 西南石油大学 Device and method for measuring permeability of rock in fracturing process

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO318632B1 (en) * 2000-06-23 2005-04-18 Inst Francais Du Petrole Procedure for evaluating physical parameters of an underground reservoir from cuttings taken from there
CN1837774A (en) * 2006-04-20 2006-09-27 中国科学院武汉岩土力学研究所 Apparatus for testing permeability coefficient of low-permeability rock medium
CN103063557A (en) * 2012-12-31 2013-04-24 河海大学 Device and method for detecting gas permeability of rock
CN104596905A (en) * 2014-12-31 2015-05-06 西南石油大学 Device and method for measuring permeability of rock in fracturing process

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