CN110132624B - Grouting system compression performance testing device and method thereof - Google Patents
Grouting system compression performance testing device and method thereof Download PDFInfo
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- CN110132624B CN110132624B CN201910402910.5A CN201910402910A CN110132624B CN 110132624 B CN110132624 B CN 110132624B CN 201910402910 A CN201910402910 A CN 201910402910A CN 110132624 B CN110132624 B CN 110132624B
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- cushion block
- circular tube
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention discloses a compression performance testing device and method for a grouting system, and belongs to the field of building materials. The device comprises a flexible circular tube, a sealing cushion block, a rigid circular tube, a flat plate and a loading cushion block; the flexible circular pipe is sleeved in the rigid circular pipe; two ends of the flexible circular tube are provided with sealing cushion blocks; a grouting system is arranged between the sealing cushion blocks; flat plates are arranged at the top of the upper end sealing cushion block and the bottom of the rigid circular tube; a fastener is arranged between the flat plates at the two ends; and a loading cushion block is arranged at the top of the upper end flat plate and is used for connecting a pressurizing device. The test result of the invention is more suitable for the actual engineering; the data is more comprehensive.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a device and a method for testing the compression performance of a grouting system.
Background
The grouting technology adopts a hydraulic, pneumatic or electrochemical method to inject slurry into pores and gaps of a rock-soil body, so that the rock-soil body becomes a new structure body with high strength and good stability, and is widely applied to a plurality of fields such as water conservancy, buildings, railways, mining industry and the like at present. The grouting pressure is slightly larger than the static water-soil pressure of the stratum by 0.1-0.2 MPa, and the water-soil pressure of the stratum is usually 0.2-0.3 MPa and sometimes 0.4 MPa. The selection of the grouting pressure is proper, for example, during the construction of a shield tunnel, the ground is raised, the position of a duct piece is deviated and the slurry is easy to leak if the synchronous grouting pressure is over-high; by adopting the undersized grouting pressure, the gap cannot be filled with slurry, or the gap filling speed is less than the gap generation speed, so that the foundation settlement is easily caused.
In the existing research, only the physical and mechanical properties of the slurry under normal pressure, such as the setting time, consistency and strength of hardened slurry, are generally researched, and the water retention of the slurry under a certain pressure in the simulated grouting construction is also provided. In the grouting process, slurry and rock-soil mass gradually form a new structure under the action of pressure, and the slurry and the rock-soil mass are a system which are mutually influenced in the forming process of the new structure. When the grouting construction quality is researched, the physical and mechanical performance of the grouting system changes the actual fitting engineering under the action of pressure, and the test result has more engineering guidance significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a grouting system compression performance testing device and a grouting system compression performance testing method, so as to solve the problem that only the research on the physical and mechanical properties of slurry under normal pressure exists in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a compression performance testing device of a grouting system comprises a flexible circular tube, a sealing cushion block, a rigid circular tube, a flat plate and a loading cushion block;
the flexible circular pipe is sleeved in the rigid circular pipe;
two ends of the flexible circular tube are provided with sealing cushion blocks;
a grouting system is arranged between the sealing cushion blocks;
flat plates are arranged at the top of the upper end sealing cushion block and the bottom of the rigid circular tube;
a fastener is arranged between the flat plates at the two ends;
and a loading cushion block is arranged at the top of the upper end flat plate and is used for connecting a pressurizing device.
Further, the fastener comprises a bolt and a nut; the bolt is fixed on the lower end flat plate; the bolt penetrates through the upper end flat plate; and a nut is arranged on the upper bolt of the upper end flat plate.
Further, the bolts are evenly distributed on the flat plate.
Furthermore, the inner diameter of the rigid circular tube is 102-110 mm, and the height of the rigid circular tube is 250-300 mm; the rigid circular tube is preferably made of a light-weight, high-strength and deformation-resistant material, such as a polymethyl methacrylate (PMMA) tube; preferably, the circular tube is composed of semicircular grooves which are equally divided into two parts along the axial direction and connected through bolts or hoops.
Further, the flexible circular tube is preferably made of a plastic or rubber material which is impermeable to water and has certain deformability; the outer diameter of the flexible circular tube is the same as the inner diameter of the rigid circular tube; the thickness of the flexible circular tube is 1-5 mm; the height of the flexible circular tube is 10-50 mm greater than that of the rigid circular tube.
Furthermore, the sealing cushion block and the loading cushion block are both circular; the diameter of the sealing cushion block is 1-2 mm smaller than the inner diameter of the flexible circular tube, and the height of the sealing cushion block is 30-50 mm; the diameter of the loading cushion block is 1-2 mm smaller than the inner diameter of the rigid circular tube, and the height of the loading cushion block is 300-400 mm; the sealing cushion block and the loading cushion block are made of polyamide resin and are light, high-strength and deformation-resistant materials.
Further, the flat plate is circular; the material comprises nylon board.
Further, it is sealed to be provided with high-elastic rubber band between flexible pipe and the seal cushion, rubber band width 3~15mm, convenient to detach to repeatedly usable.
Furthermore, the length of the bolt is 50-100 mm larger than that of the rigid circular tube, and the length of the corresponding thread is 100-200 mm.
Furthermore, the shape of the flat plate connected by the bolts is preferably circular, the material is preferably light, high-strength and deformation-resistant material, the bolts are uniformly distributed on the outer edge of the flat plate, and a rigid circular tube placing area is arranged in the inner part of the bolts on the flat plate.
A method for testing the compression performance of a grouting system is characterized in that,
sleeving a sealing cushion block on the lower part of a flexible circular pipe and placing the flexible circular pipe in a rigid circular pipe;
placing a soil body into a flexible round pipe, placing a loading cushion block, and recording the initial height of the soil body;
pressurizing the soil body to a set load to obtain a force-displacement curve of the soil body;
injecting the slurry into the upper surface of the soil body to the top end of the rigid circular tube to form a slurry injection system, and placing a sealing cushion block on the upper part of the flexible circular tube;
the rigid round pipe is displaced between the two flat plates;
pressurizing the grouting system to a set load, and recording a force-displacement curve of the grouting system in the loading process;
screwing the nut to the position of the upper flat plate, and maintaining the whole device;
and taking out the hardened slurry and soil mass to obtain the evolution of the composition, structure and mechanical property of the grouting system along with the maintenance age.
Furthermore, the set load is 0.2-0.5 MPa, and the volume ratio of the soil body to the slurry body can be set automatically, such as 3:1, 2:1, 1:1, 1:2, 1:3 and the like.
Compared with the existing test method, the invention has the advantages that:
(1) according to the invention, the soil body and the slurry are used as a system to be researched, the whole system is pressurized, various parameters in the pressurizing process are measured and recorded, and the test result is more suitable for the actual engineering;
(2) the system characteristics are different from the performances of a single material, and the performances of the system and the single material are not superposed, so that the system is researched as a system, and the result is more comprehensive;
(3) the evolution of the slurry performance under normal pressure is different from the evolution of the performance under the load action, the grouting pressure exists in the grouting construction, and both soil body and slurry are under the action of the water and soil pressure of the stratum in the forming process of a new structure; the invention considers the load effect, and under the further test load effect in the maintenance age, the composition, the structure and the mechanical property of the grouting system evolve along with the maintenance age, thereby guiding the evaluation of grouting construction quality.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals: 1-a flexible circular tube; 2-sealing the cushion block; 3-a rigid circular tube; 4-soil body; 5-slurry; 6-plate; 7-bolt; 8-loading the cushion block.
Detailed description of the preferred embodiments
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the examples.
As shown in fig. 1, a compression performance testing device of a grouting system,
the device comprises a flexible circular tube 1, a sealing cushion block 2, a rigid circular tube 3, a flat plate 6, a loading cushion block 8, a bolt 7 and a nut;
the bottom end of the flexible circular tube 1 is provided with a sealing cushion block 2, and the sealing cushion block are sealed to ensure that the water is not seeped; then the connecting body of the two is arranged in the rigid circular tube 3;
the lower end sealing cushion block 2 is used for placing a grouting system; the grouting system comprises a soil body 4 and a slurry 5.
The upper end of the grouting system is provided with another sealing cushion block 2; the top of the upper end sealing cushion block 2 and the bottom of the rigid circular tube 3 are provided with flat plates 6; the loading cushion block 8 is arranged at the top of the upper end flat plate, the loading cushion block 8 is used for connecting a pressurizing device, and the bolt 7 is fixed on the lower end flat plate 6; the bolt 7 penetrates through the upper end flat plate 6; the upper bolt 7 of the upper end flat plate 6 is provided with a nut. A fastener is arranged between the flat plates 6 at the two ends.
The two flat plates 6 can be enlarged in size, and three rigid circular tubes 3 are put down; 3 grouting systems can be formed at a time.
The flexible round tube 1 is a rubber tube with the thickness of 3mm, the outer diameter is 106mm, and the height is 320 mm;
the sealing cushion block 2 adopts a PA66 nylon rod with the diameter of 99mm and the height of 50 mm;
the rigid circular tube 3 consists of two polymethyl methacrylate (PMMA) semicircular grooves with the inner diameter of 106mm and the height of 300mm through a hoop;
the flat plate 6 is made of a nylon plate, the diameter of the flat plate is 200mm, and the thickness of the flat plate is 10 mm;
the loading pad 8 was made of a PA66 nylon rod with a diameter of 105mm and a height of 300 mm.
4 bolt holes 7 are uniformly distributed on the circumference with the diameter of 160mm, the length of the bolt is 350mm, and the length of the thread part is 100 mm;
a method for testing the compression performance of a grouting system comprises the following steps:
(1) installing a sealing cushion block on the lower part of the flexible circular tube, binding and sealing by using a rubber band, and installing the flexible circular tube into the rigid circular tube;
(2) weighing a soil body with a certain mass, uniformly filling the soil body into a flexible circular tube, placing a loading cushion block on the upper surface of the soil body, and recording the initial height of the soil body; moving the universal testing machine to pressurize to a set pressure of 0.3MPa, recording a load-displacement curve, taking a displacement value corresponding to a load peak value as a soil body compression amount, unloading, and taking out a loading cushion block;
(3) injecting the uniformly stirred slurry into a flexible circular tube until the top end of a rigid circular tube, placing a sealing cushion block on the upper part of the flexible circular tube, sealing the flexible circular tube and the rigid circular tube to ensure that the flexible circular tube and the rigid circular tube are impervious, and enabling the lower end surface of the sealing cushion block to be in contact with the upper surface of the slurry; moving between two flat plates with bolts and nuts, pressurizing to 0.3MPa by adopting a testing machine the same as the step (2), enabling the position of the movable cross beam when initially contacting with the surface of the upper flat plate to be in a zero state, and recording a system force-displacement curve in the loading process;
(4) after loading, the testing machine moving beam is static, the nut is immediately screwed to the position of the upper flat plate, unloading is carried out, and then the testing machine moving beam is moved to a set temperature and humidity environment for maintenance;
(5) and (3) curing the grouting system to a set age, unscrewing the nut, taking the rigid circular tube out of the space between the two flat plates, taking the flexible circular tube out of the rigid circular tube, disassembling the sealing cushion blocks at the two ends, taking out the hardened slurry and the hardened soil body, and researching the evolution of the composition, structure and mechanical property of the grouting system along with the curing age under the action of 0.3MPa pressure.
Some experimental results are as follows:
after the soil body is acted by the pressure of 0.3MPa, the soil body is unloaded and filled into slurry, and the pressure of 0.3MPa acts on the soil body and the slurry. The compression indexes of the 5 groups of grouting systems are shown in the following table:
| numbering | Height before compression of soil body (mm） | Compressed height of soil (mm) | Slurry height (mm) | Amount of compression (mm) | Compression index (volume%) |
| 1 | 115.0 | 101.1 | 92.0 | 17.9 | 9.3 |
| 2 | 70.0 | 53.5 | 101.5 | 14.2 | 9.2 |
| 3 | 110.0 | 84.0 | 76.0 | 13.0 | 8.1 |
| 4 | 100.0 | 75.0 | 90.0 | 17.0 | 10.3 |
| 5 | 103.0 | 73.0 | 77.0 | 17.0 | 11.3 |
Remarking: 1. the compression index = compression amount/(height after soil body compression + slurry height); 2. the diameter of the soil body and the slurry body is phi 100 mm.
By adopting the method, the load-deformation rule of the grouting system under the action of load and the evolution of the composition, structure and mechanical property of the grouting system under the action of load can be tested.
It should be understood that the above examples are only for illustrating the specific embodiments of the technical solutions of the present invention, and are not intended to limit the scope of the present invention. Various equivalent modifications and alterations of this invention will occur to those skilled in the art after reading this disclosure, and it is intended to cover such alternatives and modifications as fall within the scope of the invention as defined by the appended claims.
Claims (2)
1. A grouting system compression performance test method is characterized in that the method is realized by adopting a grouting system compression performance test device; the grouting system compression performance testing device comprises a flexible circular tube, a sealing cushion block, a rigid circular tube, a flat plate and a loading cushion block; the flexible circular pipe is sleeved in the rigid circular pipe; two ends of the flexible circular tube are provided with sealing cushion blocks; a grouting system is arranged between the sealing cushion blocks; flat plates are arranged at the top of the upper end sealing cushion block and the bottom of the rigid circular tube; a fastener is arranged between the flat plates at the two ends; the top of the upper end flat plate is provided with a loading cushion block, and the loading cushion block is used for connecting a pressurizing device; the fastener comprises a bolt and a nut; the bolt is fixed on the lower end flat plate; the bolt penetrates through the upper end flat plate; a nut is arranged on the upper bolt of the upper end flat plate;
the method comprises the following steps:
sleeving a sealing cushion block on the lower part of a flexible circular pipe and placing the flexible circular pipe in a rigid circular pipe;
placing a soil body into a flexible round pipe, placing a loading cushion block, and recording the initial height of the soil body;
pressurizing the soil body to a set load to obtain a force-displacement curve of the soil body;
injecting the slurry into the upper surface of the soil body to the top end of the rigid circular tube to form a slurry injection system, and placing a sealing cushion block on the upper part of the flexible circular tube;
the rigid circular tube is displaced between the two flat plates, and a loading cushion block is placed at the top of the upper flat plate;
adding axial pressure to the grouting system to a set load, and recording a force-displacement curve of the grouting system in the loading process;
screwing the nut to the position of the upper end flat plate, and maintaining the whole device;
and taking out the hardened slurry and soil mass to obtain the evolution of the composition, structure and mechanical property of the grouting system along with the maintenance age.
2. The grouting system compression performance testing method according to claim 1, wherein the set load is 0.2-0.5 MPa.
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2019
- 2019-05-15 CN CN201910402910.5A patent/CN110132624B/en active Active
Patent Citations (6)
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| JP2009025117A (en) * | 2007-07-19 | 2009-02-05 | Shimizu Corp | Clogging testing machine for high-pressure grout |
| CN101799386A (en) * | 2009-12-25 | 2010-08-11 | 福州大学 | Testing device and testing method for engineering mechanical properties of falling rock backfill |
| CN106018753A (en) * | 2016-07-20 | 2016-10-12 | 中国矿业大学 | System and method for compression test of filling flyash slurry in overburden rock isolated injection |
| CN107632116A (en) * | 2017-09-01 | 2018-01-26 | 山东大学 | A kind of three-dimensional grouting model test servo-control system and test method |
| CN107632652A (en) * | 2017-09-01 | 2018-01-26 | 山东大学 | A kind of slip casting Servocontrol device and operating method for indoor grouting simulation test |
| CN108362859A (en) * | 2018-02-02 | 2018-08-03 | 山东科技大学 | A kind of experimental system for simulating old goaf grouting effect |
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