CN109932294A - Normal stress-shear stress-permeability test method of meter level scale fissuted medium - Google Patents
Normal stress-shear stress-permeability test method of meter level scale fissuted medium Download PDFInfo
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- CN109932294A CN109932294A CN201711350073.3A CN201711350073A CN109932294A CN 109932294 A CN109932294 A CN 109932294A CN 201711350073 A CN201711350073 A CN 201711350073A CN 109932294 A CN109932294 A CN 109932294A
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Abstract
The invention belongs to seepage research technical fields, and in particular to a kind of normal stress-shear stress-permeability test method of meter level scale fissuted medium.Method cooperation of the invention adjusts the normal direction loading force to meter level scale fissuted medium, tangential loading force and infiltration hydraulic pressure, the permeability test parameter that acquisition flows into water flow, flows out water flow.The present invention can accurately measure and obtain the test datas such as permeability parameters of the rock mass with natural rough fracture surface during permeability test, be particularly suitable for the permeance property test of crack rock under meter level scale.
Description
Technical field
The invention belongs to seepage research technical fields, and in particular to a kind of normal stress-of meter level scale fissuted medium is cut
Shearing stress-permeability test method.
Background technique
The Penetration Signature of medium is the basic mechanical characteristic of medium.Seepage research belongs to fissuted medium basic mechanical characteristic
Research category plays basic directive function for Penetration Signature research of the medium under different operating conditions.For rock type
Quasi-brittle material containing crack, permeance property are an important factor for determining engineering rock mass long-term safety.Evaluation engineering rock mass is long
The permeability parameters of phase stability are obtained by carrying out the permeability test of crack rock, and large scale (meter level is related specifically to
Scale) rock mass permeance property, for study fissuted medium Penetration Signature have vital meaning.
It is currently used for the test method that Permeability of rock can be tested, the object of measurement is (Centimeter Level ruler under smaller scale
Degree) crack rock, the test method of use is inclusion enclave mode, i.e., crack rock is wrapped in the cavity of certain volume,
Water flow is injected from cavity one end, is discharged from the other end, the permeance property measured can not be reflected under large scale (meter level ruler
Degree) crack rock Penetration Signature.And the often classical Darcy's law that permeance property calculation method uses, is used
It is inaccurate when in engineering, influences the science of measurement result practical application.
The permeability test that rock how is carried out in the rock mass of meter level scale has been related to a series of theoretical and test skill
Art problem need solve.
Summary of the invention
The technical problem to be solved in the invention are as follows: a kind of normal stress-that can be used for meter level scale fissuted medium is provided
Shear stress-permeability test method, to realize that the Accurate Determining to meter level scale Rock Seepage Character works.
It is described that technical scheme is as follows:
A kind of normal stress-shear stress-permeability test method of meter level scale fissuted medium, comprising the following steps:
Step 1
It is divided into upper and lower two parts, i.e. top rock mass and lower part rock mass, top rock mass and lower part rock for the crack rock of test
Body material is identical, size is identical, and the two consistency from top to bottom is stacked；The logical of several vertical directions perforation is equipped with inside the rock mass of top
Hole, wherein a part of through-hole is inlet opening, remaining through-hole is apopore；Lower part rock mass upper surface is equipped with test recessed area, is lower than
Remaining region of lower part rock mass upper surface, test recessed area edge are equipped with groove and realize that the circle of test recessed area seals for sealing ring；Top rock
The lower port of all through-holes of body, is in the test recessed area of lower part rock mass；Top rock mass lower surface and lower part rock mass test
Recessed area forms water flow and flows through region, and top rock mass lower surface and remaining region of lower part rock mass upper surface are in close contact；
Step 2
Apply normal direction loading force straight down to top rock mass upper surface, rock mass lower surface applies straight up to the lower part
Normal direction loading force；
Step 3
Open the displacement of tangential loading force, shearing top rock mass and lower part rock mass to certain level direction.
Step 4
Infiltration water flow is opened, infiltration hydraulic pressure is applied to crack rock, makes inlet opening upper port stream of the water flow from top rock mass
To lower port, then flows through in region and flow in the water flow that the test recessed area of top rock mass lower surface and lower part rock mass upper surface is formed
It is dynamic, upper port is flow to from the water outlet lower port of top rock mass；The permeability test parameter that acquisition flows into water flow, flows out water flow.
As a preferred solution: the length and width size of top rock mass and lower part rock mass reaches meter level scale in step 1.
As a preferred solution: rock mass all through-hole apertures in top are consistent in step 1, and arranged in arrays by arranging.
As a preferred solution: the contact surface that top rock mass lower surface and lower part rock mass upper surface are in close contact needs in step 1
By polishing polishing.
As a preferred solution: in flow event, cooperation adjusts normal direction loading force, tangential loading force and infiltration in step 4
Hydraulic pressure, so that water flow held stationary flow regime；In the case where stablizing flow rate regime, according to seepage flow Darcy's law and cubic law, obtain
Theoretical system is calculated to the infiltration coefficient for being suitable for this test process.
As a preferred solution: permeability test parameter includes flow velocity, flow and hydraulic pressure in step 4.
The invention has the benefit that
(1) normal stress-shear stress-permeability test method of a kind of meter level scale fissuted medium of the invention, can
Accurately measures and obtain the test datas such as permeability parameters of the rock mass with natural rough fracture surface during permeability test；
(2) normal stress-shear stress-permeability test method of a kind of meter level scale fissuted medium of the invention, can
The permeance property of crack rock under the rock mass under various scales, especially meter level scale is tested to be achieved；
(3) normal stress-shear stress-permeability test method of a kind of meter level scale fissuted medium of the invention, according to
The new penetration theory counting system established, during permeability test being obtained, the infiltration coefficient of the crack rock；
(4) normal stress-shear stress-permeability test method of a kind of meter level scale fissuted medium of the invention, not only
It is easy to operate, measurement is convenient, and measurement result is accurate and reliable, particularly suitable for rock, the infiltration of coagulation great soil group quasi-brittle material
Saturating performance test.
Detailed description of the invention
Fig. 1 is the test article schematic layout pattern that the method for the present invention is related to；
Fig. 2 is the top view of top rock mass
Fig. 3 is rock sample lifting operation schematic diagram.
In figure, the top 1- rock mass, the lower part 2- rock mass, 3- water flow flows through region, 4- through-hole, 5- groove, and 6- tests recessed area, 7-
Row is hung, 8- pillar, 9- suspension hook.
Specific embodiment
A kind of normal stress-shearing of meter level scale fissuted medium of the invention is answered with reference to the accompanying drawings and examples
Power-permeability test method is described in detail.
Normal stress-shear stress-permeability test method of meter level scale fissuted medium in the present embodiment, including it is following
Step:
Step 1
It is divided into upper and lower two parts, i.e. top rock mass 1 and lower part rock mass 2 for the crack rock of test.Top rock mass 1 is under
Rock mass 2 material in portion's is identical, size is identical, and the two consistency from top to bottom is stacked.Specifically, the length of top rock mass 1 and lower part rock mass 2,
Wide size can reach meter level scale.
The through-hole 4 of several vertical directions perforation is equipped with inside top rock mass 1, wherein a part of through-hole 4 is inlet opening,
Remaining through-hole 4 is apopore, and all 4 apertures of through-hole are consistent in the present embodiment, and arranged in arrays by arranging.Table on lower part rock mass 2
Face is equipped with test recessed area 6, is lower than remaining region of 2 upper surface of lower part rock mass, and test 6 edge of recessed area is equipped with groove 5 for sealing ring
Realize the circle envelope of test recessed area 6.The lower port of all through-holes 4 of top rock mass 1 is in the test recessed area 6 of lower part rock mass 2
It is interior.1 lower surface of top rock mass and lower part rock mass 2 test the formation water flow of recessed area 6 and flow through region 3,1 lower surface of top rock mass and lower part
Remaining region of 2 upper surface of rock mass is in close contact, and contact surface need to be by polishing polishing in the present embodiment.
Step 2
It is first lifted by crane in lower part rock mass 2 to test cavity using suspension hook 9, recurrence is hung on above portion's rock mass 1 to lower part rock mass 2, really
The surrounding boundary for protecting two pieces of rock mass corresponds.
Apply normal direction loading force straight down to 1 upper surface of top rock mass, to the lower part 2 lower surface of rock mass apply vertically to
On normal direction loading force, normal direction loading force stablizes the numerical value after being loaded onto certain value.
Step 3
Shearing loading force is opened, stablizes this after shearing top rock mass 1 and the displacement of lower part rock mass 2 to certain level direction and cuts
To loading force numerical value.It should be noted that although top rock mass 1 and lower part rock mass 2 deposit displacement in the horizontal direction, top rock
The lower port of all through-holes 4 of body 1, is still in the test recessed area 6 of lower part rock mass 2.
Step 4
Infiltration water flow is opened, infiltration hydraulic pressure is applied to crack rock, even if water flow is from the inlet opening upper port of top rock mass 1
It is flow to lower port, then flows through area in the water flow that the test recessed area 6 of 1 lower surface of top rock mass and 2 upper surface of lower part rock mass is formed
Flowing, flow to upper port from the water outlet lower port of top rock mass 1 in domain 3.
By flow monitor and water pressure sensor, flow velocity, flow and the water that can obtain and flow into water flow, flow out water flow
The infiltration test parameters such as pressure.
In the present embodiment, in flow event, normal direction loading force, shearing loading force and infiltration hydraulic pressure number need to be paid close attention to
Value, adjusting of working in coordination, so that water flow held stationary flow regime, prevents the irregular flow phenomenon such as turbulent flow.In stabilization
Under flow rate regime, according to seepage flow Darcy's law and cubic law, the infiltration coefficient computational theory for being suitable for this test process is obtained
System.
Claims (6)
1. a kind of normal stress of meter level scale fissuted medium-permeability test method, it is characterised in that: the following steps are included:
Step 1
Be divided into upper and lower two parts, i.e. top rock mass (1) and lower part rock mass (2) for the crack rock of test, top rock mass (1) and
Lower part rock mass (2) material is identical, size is identical, and the two consistency from top to bottom is stacked；Several vertical sides are equipped with inside top rock mass (1)
To the through-hole (4) of perforation, wherein a part of through-hole (4) is inlet opening, remaining through-hole (4) is apopore；On lower part rock mass (2)
Surface is equipped with test recessed area (6), is lower than lower part rock mass (2) remaining region of upper surface, and test recessed area (6) edge is equipped with groove
(5) realize that the circle of test recessed area (6) seals for sealing ring；The lower port of all through-holes (4) of top rock mass (1), is in lower part
In the test recessed area (6) of rock mass (2)；Rock mass (1) lower surface in top forms water flow with lower part rock mass (2) test recessed area (6) and flows through
Region (3), top rock mass (1) lower surface and lower part rock mass (2) remaining region of upper surface are in close contact；
Step 2
Apply normal direction loading force straight down to top rock mass (1) upper surface, to the lower part rock mass (2) lower surface apply vertically to
On normal direction loading force；
Step 3
Shearing loading force is opened, the displacement of top rock mass (1) and lower part rock mass (2) to certain level direction is sheared.
Step 4
Infiltration water flow is opened, infiltration hydraulic pressure is applied to crack rock, flow to water flow from the inlet opening upper port of top rock mass (1)
Then lower port is flowed through in the water flow that the test recessed area (6) of top rock mass (1) lower surface and lower part rock mass (2) upper surface is formed
Flowing, flow to upper port from the water outlet lower port of top rock mass (1) in region (3)；The infiltration that acquisition flows into water flow, flows out water flow
Saturating test parameters.
2. a kind of normal stress-permeability test method of meter level scale fissuted medium according to claim 1, feature exist
In: in step 1, the length and width size of top rock mass (1) and lower part rock mass (2) reaches meter level scale.
3. a kind of normal stress-permeability test method of meter level scale fissuted medium according to claim 1, feature exist
In: in step 1, top rock mass (1) all through-holes (4) aperture is consistent, and arranged in arrays by arranging.
4. a kind of normal stress-permeability test method of meter level scale fissuted medium according to claim 1, feature exist
In: in step 1, the contact surface that top rock mass (1) lower surface and lower part rock mass (2) upper surface are in close contact need to be by polishing throwing
Light.
5. a kind of normal stress-permeability test method of meter level scale fissuted medium according to claim 1, feature exist
In: in step 4, in flow event, cooperation adjusts normal direction loading force, shearing loading force and infiltration hydraulic pressure, so that water flow is kept
Smooth flow state；In the case where stablizing flow rate regime, according to seepage flow Darcy's law and cubic law, obtain being suitable for this test process
Infiltration coefficient calculate theoretical system.
6. a kind of normal stress-permeability test method of meter level scale fissuted medium according to claim 1, feature exist
In: in step 4, permeability test parameter includes flow velocity, flow and hydraulic pressure.
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| CN103994957A (en) * | 2013-02-20 | 2014-08-20 | 核工业北京地质研究院 | Test device for determining permeability of large-scale single fracture medium under normal stress |
| CN105203411A (en) * | 2015-11-06 | 2015-12-30 | 武汉大学 | Slit shear-seepage coupling test system of triaxial cell and test method |
| EP2954305A4 (en) * | 2013-02-08 | 2016-02-17 | Services Petroliers Schlumberger | Apparatus and methodology for measuring properties of microporous material at multiple scales |
| CN105466828A (en) * | 2014-09-09 | 2016-04-06 | 核工业北京地质研究院 | High-seepage-pressure-resistant sealing method for fractured rock mass under shearing effect |
| CN105717017A (en) * | 2014-12-05 | 2016-06-29 | 核工业北京地质研究院 | Experiment method for testing permeability of rough fracture rock |
| CN105717015A (en) * | 2014-12-05 | 2016-06-29 | 核工业北京地质研究院 | Meter-scale fractured rock mass permeability testing method |
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2017
- 2017-12-15 CN CN201711350073.3A patent/CN109932294A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2954305A4 (en) * | 2013-02-08 | 2016-02-17 | Services Petroliers Schlumberger | Apparatus and methodology for measuring properties of microporous material at multiple scales |
| CN103994957A (en) * | 2013-02-20 | 2014-08-20 | 核工业北京地质研究院 | Test device for determining permeability of large-scale single fracture medium under normal stress |
| CN105466828A (en) * | 2014-09-09 | 2016-04-06 | 核工业北京地质研究院 | High-seepage-pressure-resistant sealing method for fractured rock mass under shearing effect |
| CN105717017A (en) * | 2014-12-05 | 2016-06-29 | 核工业北京地质研究院 | Experiment method for testing permeability of rough fracture rock |
| CN105717015A (en) * | 2014-12-05 | 2016-06-29 | 核工业北京地质研究院 | Meter-scale fractured rock mass permeability testing method |
| CN105203411A (en) * | 2015-11-06 | 2015-12-30 | 武汉大学 | Slit shear-seepage coupling test system of triaxial cell and test method |
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Application publication date: 20190625 |