CN109752250B - Device and method for synchronously loading internal and external pressures in mud-water splitting test - Google Patents
Device and method for synchronously loading internal and external pressures in mud-water splitting test Download PDFInfo
- Publication number
- CN109752250B CN109752250B CN201910060396.1A CN201910060396A CN109752250B CN 109752250 B CN109752250 B CN 109752250B CN 201910060396 A CN201910060396 A CN 201910060396A CN 109752250 B CN109752250 B CN 109752250B
- Authority
- CN
- China
- Prior art keywords
- sample
- hole
- way joint
- pressure
- base
- 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.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000011068 loading method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 21
- 239000012528 membrane Substances 0.000 claims description 13
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention provides a device and a method for synchronously loading internal and external pressures in a mud-water fracturing test, wherein the device comprises the following steps: the device comprises a base, an external pressure chamber, a rubber film, a sample, a top plate, a shaft pressing rod, a piston cylinder, a first three-way joint, a second three-way joint and a four-way joint; the middle part of the base is provided with a sample pedestal higher than the base and used for placing a sample, the center of the sample pedestal is provided with a grouting hole, the base is also provided with a water injection hole, and the water injection hole is arranged between the outer edge of the sample pedestal and the outer edge of the base; the lower end of the four-way joint is also provided with a one-way valve for injecting slurry into the grouting holes in one direction; the upper end of the first three-way joint is connected with the water injection hole, the lower end is connected with the outlet end of the piston cylinder, the upper end of the second three-way joint is connected with the inlet end of the piston cylinder, the left end of the second three-way joint is connected with the one-way valve at the lower end of the four-way joint, and the upper end of the four-way joint is connected with the grouting hole. The invention can avoid the damage of the sample caused by overlarge internal and external pressure difference during external pressure loading in the conventional splitting test.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a device and a method for synchronously loading internal and external pressures in a mud-water splitting test.
Background
The existing shield method is widely applied to the construction of tunnel engineering by virtue of the advantages of high mechanical degree, high construction speed, small disturbance to stratum and the like, and particularly, the slurry balance shield is most used in an underwater tunnel. In the slurry shield tunnel construction process, the setting of slurry cabin pressure is a precondition for ensuring the stability of an excavation surface. Too high pressure can cause the face to split, and engineering accidents occur.
At present, the study on the formation splitting pressure is mainly carried out on a conventional triaxial apparatus, a hollow cylindrical sample is adopted as the sample, the external pressure of the sample is applied through confining pressure, the internal pressure of a through hole is applied through a back pressure pressurizing system, a conventional triaxial confining pressure loading system and a back pressure loading system are separated, and the external pressure and the internal pressure cannot be synchronously loaded. Because the sample is smaller, when the internal and external pressure is applied, the pressure difference is larger, so that the sample is easy to crush, and the success rate of the experiment is affected.
Disclosure of Invention
The invention provides a device and a method for synchronously loading internal and external pressures in a mud-water splitting test, which are used for realizing synchronous loading of the internal and external pressures in the splitting test process.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
The invention provides a device for synchronously loading internal and external pressures in a mud-water splitting test, which comprises: base, external pressure room, rubber membrane, sample, roof and axle press pole, its characterized in that still includes: the piston cylinder, the first three-way joint, the second three-way joint and the four-way joint;
The middle part of the base is provided with a sample pedestal higher than the base and used for placing a sample, the center of the sample pedestal is provided with a grouting hole, the base is also provided with a water injection hole, and the water injection hole is arranged between the outer edge of the sample pedestal and the outer edge of the base;
the lower end of the four-way joint is also provided with a one-way valve for injecting slurry into the grouting hole in one direction;
The upper end of the first three-way joint is connected with the water injection hole, the lower end of the first three-way joint is connected with the outlet end of the piston cylinder, the upper end of the second three-way joint is connected with the inlet end of the piston cylinder, the left end of the second three-way joint is connected with the one-way valve at the lower end of the four-way joint, and the upper end of the four-way joint is connected with the grouting hole.
Preferably, the left and right ends of the four-way joint are respectively connected with a pressure gauge and a pressure relief hole.
Preferably, the top of the external pressure chamber is provided with an exhaust hole and a pressure gauge, the center of the top of the external pressure chamber is provided with a round hole, the inner diameter of the round hole is equal to the outer diameter of the shaft pressure rod and used for being inserted into the shaft pressure rod, and the inner side of the round hole is provided with a sealing ring and used for sealing the shaft pressure rod and the external pressure chamber.
Preferably, the sample is a cylindrical sample having a through hole in the middle, the outer diameter of the sample is equal to the outer diameter of the sample holder, and the diameter of the through hole is equal to the diameter of the grouting hole.
Preferably, the top plate is a circular plate, the outer diameter of the top plate is equal to the outer diameter of the sample, a groove is formed in the center of the upper portion of the top plate, and the groove is used for inserting the axial compression rod into the top plate through the external compression chamber, so that the axial force of the axial compression rod is perpendicular to the top plate.
Preferably, the rubber membrane is in a cylindrical shape with openings at two ends, the two ends are respectively sleeved on the outer edge of the top plate and the outer edge of the sample pedestal, the rubber membrane is made of transparent materials, and the inner diameter is equal to the outer diameter of the sample.
Preferably, the right end of the first three-way joint is also connected with a water injection pipe, and the right end of the second three-way joint is also connected with a grouting pipe.
Preferably, the cylinder body of the piston cylinder is made of stainless steel, the piston in the piston cylinder is made of rubber, the base is made of metal, and the shaft pressing rod is made of metal.
Preferably, the edge of the base is provided with a sealing groove, a rubber sealing ring is further placed in the sealing groove, and the outer ring of the base and the outer ring of the outer pressure chamber are further provided with bolt holes for fixing the outer pressure chamber and the base through bolts.
The invention also provides an internal and external pressure synchronous loading method for carrying out a muddy water splitting test by using the internal and external pressure synchronous loading device, which is characterized by comprising the following steps of:
1) Placing the prepared cylindrical sample with the through hole in the middle on a sample pedestal of a base, placing one side of a top plate with a groove upwards on the top of the sample, sleeving a rubber film on the outer side of the sample, and respectively hooping the upper end and the lower end of the rubber film on the outer edges of the top plate and the sample pedestal;
2) Placing a sealing ring in a sealing groove of the base, inserting a shaft pressing rod into a round hole in the center of the top of the external pressing chamber, covering the external pressing chamber on the base, simultaneously ensuring that the lower end of the shaft pressing rod is aligned with a groove in the upper part of the top plate, and fixing and pressing the external pressing chamber and the base by using a bolt;
3) Opening an exhaust hole at the top of the external pressure chamber, simultaneously opening a valve at the bottom of the piston cylinder, and injecting water into the external pressure chamber and the upper part of the piston cylinder through a water injection pipe connected to the right side of the first three-way joint until water in the external pressure chamber is discharged from the exhaust hole, wherein a piston in the piston cylinder is at the bottommost part;
4) Closing valves of an exhaust hole and a water injection pipe, closing a pressure relief hole on the right side of the four-way joint, injecting slurry from a grouting pipe on the right side of a second three-way joint, filling slurry into a through hole of a sample, starting the slurry to flow into the bottom of a piston cylinder through the second three-way joint, keeping synchronous increase of the pressure of an external pressure chamber and the pressure of the through hole through the piston cylinder until the pressure of the external pressure chamber reaches a set external pressure value, and closing a valve at the bottom of the piston cylinder, wherein the pressure of the through hole is equal to the pressure of the external pressure chamber;
5) Continuing grouting, gradually increasing the pressure of the through hole of the sample, keeping the pressure of the external pressure chamber unchanged until the sample is split, and stopping grouting;
6) And simultaneously, an internal pressure relief hole on the right side of the four-way joint and a grouting pipe on the right side of the first three-way joint are opened to synchronously relieve pressure inside and outside.
According to the technical scheme provided by the device and the method for synchronously loading the internal and external pressures in the muddy water splitting test, the internal and external pressures are synchronously loaded when the internal and external pressures are applied in the test, so that the sample damage caused by overlarge internal and external pressure difference in the external pressure loading in the conventional splitting test is avoided, and the device has the advantages of simple structure, convenience in operation, no site limitation and convenience in data acquisition.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a device for synchronously loading internal and external pressures in a mud-water splitting test according to an embodiment of the invention.
Reference numerals:
1-shaft compression bar 2-exhaust hole 3-external pressure chamber 4-sample 5-water injection port 6-water injection pipe 7-piston cylinder 8-valve 9-grouting pipe 10-four-way joint 11-first three-way joint 12-pressure relief port 13-one-way valve 14-pressure gauge 15-grouting hole 16-base 17-rubber film 18-top plate 19-pressure gauge 20-sealing ring 21-second three-way joint 22-through hole
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several specific embodiments illustrated in the drawings and in no way should be taken to limit the embodiments of the invention.
Example 1
Fig. 1 is a schematic structural diagram of an internal and external pressure synchronous loading device for mud-water splitting test according to the embodiment, and referring to fig. 1, the device includes: the device comprises a base 16, an external pressure chamber 3, a rubber membrane 17, a sample 4, a top plate 18, a shaft pressing rod 1, a piston cylinder 7, a first three-way joint 11, a second three-way joint 21 and a four-way joint 10.
Wherein, the middle part of base is provided with the sample pedestal that is higher than base 16 for place the sample, the center of sample pedestal is provided with grouting hole 15, still be provided with water injection hole 5 on the base, water injection hole 5 sets up between the outward flange of sample pedestal and the outward flange of base 16.
The lower end of the four-way joint 10 is also provided with a one-way valve 13 for injecting slurry into the grouting holes in one direction.
The upper end of the first three-way joint 11 is connected with the water injection hole 5, the lower end is connected with the outlet end of the piston cylinder 7, the upper end of the second three-way joint 21 is connected with the inlet end of the piston cylinder 7, the left end of the second three-way joint 21 is connected with the one-way valve 13 at the lower end of the four-way joint 10, and the upper end of the four-way joint 10 is connected with the grouting hole 15.
A valve 8 is also arranged between the upper end of the second three-way joint 21 and the inlet end of the piston cylinder 7.
The left and right ends of the four-way joint are respectively connected with a pressure gauge 14 and a pressure relief hole 12.
The top of the external pressure chamber 3 is provided with an exhaust hole 2 and a pressure gauge 19, and the exhaust hole 2 is used for exhausting air of the external pressure chamber when water is injected. The center of the top of the external pressure chamber 3 is provided with a round hole, the inner diameter of the round hole is equal to the outer diameter of the shaft pressure rod 1 and is used for being inserted into the shaft pressure rod 1, and the inner side of the round hole is provided with a sealing ring and is used for sealing the shaft pressure rod 1 and the external pressure chamber 3.
The sample is a cylindrical sample having a through hole 22 in the middle, the outer diameter of the sample is equal to the outer diameter of the sample holder, and the diameter of the through hole 22 is equal to the diameter of the grouting hole 15. The check valve 13 can ensure that mud in the through hole in the sample cannot flow back, so that the inner hole pressure is kept relatively stable.
The top plate 18 is a circular plate, the outer diameter of the top plate is equal to the outer diameter of the sample, a groove is formed in the center of the upper portion of the top plate 18, and the groove is used for inserting the axial compression rod 1 into the groove of the top plate 18 through the external compression chamber 3, so that the axial force of the axial compression rod 1 is perpendicular to the top plate 18.
The rubber membrane is cylindrical with two open ends, the rubber membrane is made of transparent materials, and the inner diameter is equal to the outer diameter of the sample. The rubber membrane is placed outside the sample, the upper end is sleeved on the outer edge of the top plate 18, and the lower end is sleeved on the outer edge of the sample pedestal. The rubber membrane is used to isolate the sample from the water of the confining pressure chamber.
The right end of the first three-way joint 11 is also connected with a water injection pipe 6, and the right end of the second three-way joint 21 is also connected with a grouting pipe 9.
The cylinder body of the piston cylinder 7 is made of stainless steel, a piston in the piston cylinder is made of rubber, the base is made of metal, and the shaft pressing rod is made of metal. In the test, the upper part in the piston cylinder is water, and the lower part is mud.
The edge of base is equipped with the seal groove, has still placed rubber seal 20 in the seal groove, the outer lane of base with the outer lane of outer pressure room still is provided with the bolt hole for through the bolt fastening outer pressure room and base.
Example two
The embodiment provides an internal and external pressure synchronous loading method for a mud-water splitting test, which comprises the following steps:
1) Placing the prepared cylindrical sample with the through hole in the middle on a sample pedestal of a base, placing one side of a top plate with a groove upwards on the top of the sample, sleeving a rubber film on the outer side of the sample, and respectively hooping the upper end and the lower end of the rubber film on the outer edges of the top plate and the sample pedestal;
2) Placing a sealing ring in a sealing groove of the base, inserting a shaft pressing rod into a round hole in the center of the top of the external pressing chamber, covering the external pressing chamber on the base, simultaneously ensuring that the lower end of the shaft pressing rod is aligned with a groove in the upper part of the top plate, and fixing and pressing the external pressing chamber and the base by using a bolt;
3) Opening an exhaust hole at the top of the external pressure chamber, simultaneously opening a valve at the bottom of the piston cylinder, and injecting water into the external pressure chamber and the upper part of the piston cylinder through a water injection pipe connected to the right side of the first three-way joint until water in the external pressure chamber is discharged from the exhaust hole, wherein a piston in the piston cylinder is at the bottommost part;
4) Closing valves of an exhaust hole and a water injection pipe, closing a pressure relief hole on the right side of the four-way joint, injecting slurry from a grouting pipe on the right side of the second three-way joint, filling slurry into a through hole of a sample, continuing grouting, and starting to flow the slurry into the bottom of a piston cylinder through the second three-way joint because of the existence of a one-way valve, wherein the pressure of an external pressure chamber and the pressure of the through hole are kept to be synchronously increased through the piston cylinder until the pressure of the external pressure chamber reaches a set external pressure value, closing a valve at the bottom of the piston cylinder, and the pressure of the through hole is equal to the pressure of the external pressure chamber;
5) And (3) continuing grouting, gradually increasing the pressure of the through hole of the sample, keeping the pressure of the external pressure chamber unchanged until the sample is split, and stopping grouting.
6) And simultaneously, an internal pressure relief hole on the right side of the four-way joint and a grouting pipe on the right side of the first three-way joint are opened to synchronously relieve pressure inside and outside.
In conclusion, the device for synchronously loading the internal pressure and the external pressure in the muddy water splitting test has a simple structure, is convenient to operate, can realize synchronous loading of the internal pressure and the external pressure in the splitting test process, and avoids sample damage caused by overlarge internal and external pressure difference in the external pressure loading in the conventional splitting test.
Those of ordinary skill in the art will appreciate that: the components in the apparatus of the embodiments may be distributed in the apparatus of the embodiments according to the description of the embodiments, or may be located in one or more apparatuses different from the present embodiments with corresponding changes. The components of the above embodiments may be combined into one component or may be further split into a plurality of sub-components.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the method embodiments, since they are substantially similar to the apparatus embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part. The above-described embodiments of the apparatus and system are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the objectives of the present embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
1. A device for synchronous loading of muddy water fracturing test internal and external pressure includes: base, external pressure room, rubber membrane, sample, roof and axle press pole, its characterized in that still includes: the piston cylinder, the first three-way joint, the second three-way joint and the four-way joint;
The middle part of the base is provided with a sample pedestal higher than the base and used for placing a sample, the center of the sample pedestal is provided with a grouting hole, the base is also provided with a water injection hole, and the water injection hole is arranged between the outer edge of the sample pedestal and the outer edge of the base;
the lower end of the four-way joint is also provided with a one-way valve for injecting slurry into the grouting hole in one direction;
the upper end of the first three-way joint is connected with the water injection hole, the lower end of the first three-way joint is connected with the outlet end of the piston cylinder, the upper end of the second three-way joint is connected with the inlet end of the piston cylinder, the left end of the second three-way joint is connected with the one-way valve at the lower end of the four-way joint, and the upper end of the four-way joint is connected with the grouting hole;
The synchronous loading process of the internal and external pressures of the device comprises the following steps:
1) Placing the prepared cylindrical sample with the through hole in the middle on a sample pedestal of a base, placing one side of a top plate with a groove upwards on the top of the sample, sleeving a rubber film on the outer side of the sample, and respectively hooping the upper end and the lower end of the rubber film on the outer edges of the top plate and the sample pedestal;
2) Placing a sealing ring in a sealing groove of the base, inserting a shaft pressing rod into a round hole in the center of the top of the external pressing chamber, covering the external pressing chamber on the base, simultaneously ensuring that the lower end of the shaft pressing rod is aligned with a groove in the upper part of the top plate, and fixing and pressing the external pressing chamber and the base by using a bolt;
3) Opening an exhaust hole at the top of the external pressure chamber, simultaneously opening a valve at the bottom of the piston cylinder, and injecting water into the external pressure chamber and the upper part of the piston cylinder through a water injection pipe connected to the right side of the first three-way joint until water in the external pressure chamber is discharged from the exhaust hole, wherein a piston in the piston cylinder is at the bottommost part;
4) Closing valves of an exhaust hole and a water injection pipe, closing a pressure relief hole on the right side of the four-way joint, injecting slurry from a grouting pipe on the right side of a second three-way joint, filling slurry into a through hole of a sample, starting the slurry to flow into the bottom of a piston cylinder through the second three-way joint, keeping synchronous increase of the pressure of an external pressure chamber and the pressure of the through hole through the piston cylinder until the pressure of the external pressure chamber reaches a set external pressure value, and closing a valve at the bottom of the piston cylinder, wherein the pressure of the through hole is equal to the pressure of the external pressure chamber;
5) Continuing grouting, gradually increasing the pressure of the through hole of the sample, keeping the pressure of the external pressure chamber unchanged until the sample is split, and stopping grouting;
6) Simultaneously opening an internal pressure relief hole on the right side of the four-way joint and a grouting pipe on the right side of the first three-way joint to synchronously relieve pressure inside and outside;
the sample is a cylindrical sample with a through hole in the middle, the outer diameter of the sample is equal to the outer diameter of a sample pedestal, and the diameter of the through hole is equal to the diameter of the grouting hole; the one-way valve is used for ensuring that mud in the through hole in the sample cannot flow back;
The top plate is a circular plate, the outer diameter of the top plate is equal to the outer diameter of the sample, a groove is formed in the center of the upper part of the top plate, and the groove is used for inserting the axial compression rod into the top plate through the external compression chamber, so that the axial force of the axial compression rod is perpendicular to the top plate;
The rubber membrane is cylindrical with openings at two ends, the two ends of the rubber membrane are respectively sleeved on the outer edge of the top plate and the outer edge of the sample pedestal, the rubber membrane is made of transparent materials, and the inner diameter of the rubber membrane is equal to the outer diameter of the sample.
2. The device of claim 1, wherein the left and right ends of the four-way connector are respectively connected with a pressure gauge and a pressure relief hole.
3. The device according to claim 1, wherein the top of the outer pressure chamber is provided with an exhaust hole and a pressure gauge, the center of the top of the outer pressure chamber is provided with a round hole, the inner diameter of the round hole is equal to the outer diameter of the shaft pressure rod and is used for inserting the shaft pressure rod, and a sealing ring is arranged on the inner side of the round hole and is used for sealing the shaft pressure rod and the outer pressure chamber.
4. The device of claim 1, wherein the right end of the first three-way joint is further connected with a water injection pipe, and the right end of the second three-way joint is further connected with a grouting pipe.
5. The device of claim 1, wherein the cylinder body of the piston cylinder is made of stainless steel, the piston in the piston cylinder is made of rubber, the base is made of metal, and the shaft pressing rod is made of metal.
6. The device of claim 1, wherein a sealing groove is formed in the edge of the base, a rubber sealing ring is further placed in the sealing groove, and bolt holes are further formed in the outer ring of the base and the outer ring of the outer pressure chamber and used for fixing the outer pressure chamber and the base through bolts.
7. An internal and external pressure synchronous loading method for carrying out a mud-water splitting test by using the device of any one of claims 1 to 6, which is characterized by comprising the following steps:
1) Placing the prepared cylindrical sample with the through hole in the middle on a sample pedestal of a base, placing one side of a top plate with a groove upwards on the top of the sample, sleeving a rubber film on the outer side of the sample, and respectively hooping the upper end and the lower end of the rubber film on the outer edges of the top plate and the sample pedestal;
2) Placing a sealing ring in a sealing groove of the base, inserting a shaft pressing rod into a round hole in the center of the top of the external pressing chamber, covering the external pressing chamber on the base, simultaneously ensuring that the lower end of the shaft pressing rod is aligned with a groove in the upper part of the top plate, and fixing and pressing the external pressing chamber and the base by using a bolt;
3) Opening an exhaust hole at the top of the external pressure chamber, simultaneously opening a valve at the bottom of the piston cylinder, and injecting water into the external pressure chamber and the upper part of the piston cylinder through a water injection pipe connected to the right side of the first three-way joint until water in the external pressure chamber is discharged from the exhaust hole, wherein a piston in the piston cylinder is at the bottommost part;
4) Closing valves of an exhaust hole and a water injection pipe, closing a pressure relief hole on the right side of the four-way joint, injecting slurry from a grouting pipe on the right side of a second three-way joint, filling slurry into a through hole of a sample, starting the slurry to flow into the bottom of a piston cylinder through the second three-way joint, keeping synchronous increase of the pressure of an external pressure chamber and the pressure of the through hole through the piston cylinder until the pressure of the external pressure chamber reaches a set external pressure value, and closing a valve at the bottom of the piston cylinder, wherein the pressure of the through hole is equal to the pressure of the external pressure chamber;
5) Continuing grouting, gradually increasing the pressure of the through hole of the sample, keeping the pressure of the external pressure chamber unchanged until the sample is split, and stopping grouting;
6) And simultaneously, an internal pressure relief hole on the right side of the four-way joint and a grouting pipe on the right side of the first three-way joint are opened to synchronously relieve pressure inside and outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060396.1A CN109752250B (en) | 2019-01-22 | Device and method for synchronously loading internal and external pressures in mud-water splitting test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060396.1A CN109752250B (en) | 2019-01-22 | Device and method for synchronously loading internal and external pressures in mud-water splitting test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109752250A CN109752250A (en) | 2019-05-14 |
| CN109752250B true CN109752250B (en) | 2024-07-05 |
Family
ID=
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308393A (en) * | 2013-05-31 | 2013-09-18 | 北京交通大学 | Formation fracturing resistance testing device and method |
| CN108333060A (en) * | 2018-03-27 | 2018-07-27 | 武汉市政工程设计研究院有限责任公司 | The testing machine that claystone shear crack infiltration coefficient develops is measured using steady state method |
| CN209673555U (en) * | 2019-01-22 | 2019-11-22 | 北京交通大学 | The synchronous loading device of interior external pressure for muddy water diametral compression test |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308393A (en) * | 2013-05-31 | 2013-09-18 | 北京交通大学 | Formation fracturing resistance testing device and method |
| CN108333060A (en) * | 2018-03-27 | 2018-07-27 | 武汉市政工程设计研究院有限责任公司 | The testing machine that claystone shear crack infiltration coefficient develops is measured using steady state method |
| CN209673555U (en) * | 2019-01-22 | 2019-11-22 | 北京交通大学 | The synchronous loading device of interior external pressure for muddy water diametral compression test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105239965B (en) | Halogen method is arranged in salt hole air reserved storeroom gas injection | |
| CN106644625B (en) | A kind of test method based on three axis sample sample preparation device of low-intensity microorganism calcareous sand | |
| CN107191172B (en) | Hole sealing, hydraulic fracturing and gas extraction integrated construction device and construction method thereof | |
| CN106894799B (en) | Device and method for displacing coal bed gas by using supercritical carbon dioxide | |
| CN105863556A (en) | Coal-mine gas extraction drilling pressurized grouting rapid hole packer and use method thereof | |
| CN101482026A (en) | Gas extraction secondary high-pressure slip-casting hole-sealing apparatus and its hole-sealing method | |
| AU2019201471B2 (en) | High-pressure self-locking packer and setting method thereof | |
| CN109736864A (en) | A kind of mining hydraulic constant-resistance deformation releasing pressure automatically anchor pole and its working method | |
| CN110887775A (en) | System and method for testing permeability of triaxial slurry of post-peak fractured rock | |
| CN102913184A (en) | Secondary composite high-pressure grouting and sealing process of gas drainage drilling artificial separation barrier | |
| CN106769215A (en) | A kind of device and method for fetching water for continuously acquiring drilling water sample in situ | |
| CN109752250B (en) | Device and method for synchronously loading internal and external pressures in mud-water splitting test | |
| CN112432857A (en) | Hydrofracturing method ground stress test device with pressurization pressure release control switch | |
| CN107631113B (en) | A kind of oil connection of Fast Installation disassembly | |
| CN108625836B (en) | Water control and yield increase method for low-permeability bottom water reservoir high-water-content oil well | |
| CN109162695A (en) | A kind of deep hole packer permeability test device | |
| RU2208127C1 (en) | Double-acting hydraulic packer | |
| CN206722800U (en) | A kind of sealing system on solvable bridging plug | |
| CN110939462B (en) | Accurate pouring device for confined concrete arch and efficient construction method | |
| CN213544581U (en) | High polymer slurry self-expansion characteristic testing device | |
| CN209673555U (en) | The synchronous loading device of interior external pressure for muddy water diametral compression test | |
| CN108204130A (en) | Concrete filled steel tube pressing shaping device and method | |
| CN207177815U (en) | Oil pumping well casing protective packer | |
| CN113187429A (en) | Mining hole sealing bag | |
| CN209556979U (en) | A kind of water swelling hole packer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |