CN114858657A - Testing device and testing method for evaluating improvement effect of muck - Google Patents
Testing device and testing method for evaluating improvement effect of muck Download PDFInfo
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- CN114858657A CN114858657A CN202210801164.9A CN202210801164A CN114858657A CN 114858657 A CN114858657 A CN 114858657A CN 202210801164 A CN202210801164 A CN 202210801164A CN 114858657 A CN114858657 A CN 114858657A
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- 230000000694 effects Effects 0.000 title claims abstract description 32
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 230000006872 improvement Effects 0.000 title claims abstract description 25
- 239000002689 soil Substances 0.000 claims abstract description 216
- 239000002893 slag Substances 0.000 claims abstract description 150
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000009412 basement excavation Methods 0.000 claims abstract description 6
- 238000010998 test method Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims description 25
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 3
- 239000013049 sediment Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000005641 tunneling Effects 0.000 description 3
- 238000009795 derivation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/126—Loading devices or installations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention belongs to the technical field of shield construction muck improvement, and provides a test device and a test method for evaluating muck improvement effect, which can simulate the physical and mechanical properties of muck in the actual shield excavation and slag discharge processes and visually evaluate the smoothness of muck soil discharge; the method can simulate the actual pressure value of the shield soil cabin, and evaluate whether the improved muck is homogeneous or not and has good fluidity and plasticity from the new angle of the transmission efficiency and the apparent density of the muck force; the device is reasonable in design and strong in operability, and a small-scale model test is carried out before actual shield construction, so that the construction efficiency can be improved, and the shield can be guaranteed to be safely tunneled.
Description
Technical Field
The invention belongs to the technical field of shield construction muck improvement, and particularly relates to a test device and a test method for evaluating muck improvement effect.
Background
Because the earth pressure balance shield has the advantages of high mechanization degree, less mud pollution, small influence on the environment, safe construction and the like, the earth pressure balance shield is widely applied to the tunneling operation of various stratum tunnels by combining with a muck improvement technology at present and becomes a preferred mode for urban subway construction.
The earth pressure balance shield is a medium for stabilizing the water and earth pressure of the tunnel face by using the dregs in the soil cabin, so that the transmission efficiency of the dregs force in the soil cabin is particularly important for the safety of actual construction and the control of stratum settlement. In order to ensure that the slag soil has good fluidity and homogeneity and force transmission, additives (foam, bentonite, polymer, dispersant and the like) are added for improvement, so that a reasonable and efficient method for evaluating the effect of improving the slag soil is needed.
At present, the evaluation method for improving the slag soil effect is mainly based on a slump test, a shear test and a penetration test, the fluidity of the slag soil is evaluated through the slump value, the friction of the slag soil is evaluated through the shear strength, and the impermeability of the slag soil is evaluated through the penetration coefficient. The method evaluates the improvement effect through an indoor test based on the little muck, and fails to show the overall characteristics of the improved muck in the tunneling and deslagging process under the actual pressure condition. Therefore, the muck slump, permeability and shear strength meet the requirements frequently, but the actual shield tunneling speed is low and the tunnel face pressure is unstable, so that the evaluation of the actual muck improvement effect in the soil cabin according to the three methods is inaccurate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a test device for evaluating the improvement effect of the muck.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a test device for evaluating the improvement effect of slag soil comprises a spiral slag discharging system, a pressurizing system, a continuous slag adding system, a pressure sensor system and a sealed soil cabin;
the spiral slag discharging system comprises a slag conveying device, a slag discharging port and a slag conveying port, the slag conveying device is connected with the sealed soil cabin through the slag conveying port, and the slag discharging port is connected with the slag conveying device;
the pressurization system is connected with the sealed soil cabin and is used for adjusting the air pressure in the sealed soil cabin;
the pressure sensor system comprises a soil pressure sensor which is arranged in the sealed soil cabin;
the continuous slag adding system comprises a slag adding conveying device, a slag adding port and a slag adding conveying port, wherein the slag adding conveying device is connected with the sealed soil cabin through the slag adding conveying port, and the slag adding port is connected with the slag adding conveying device.
Preferably, dregs conveyor includes dregs transport cylinder, hob, frequency modulation motor and first support, the one end of dregs transport cylinder with sealed soil cabin is connected, dregs transport port locates dregs transport cylinder with the junction in sealed soil cabin, frequency modulation motor locates the other end of dregs transport cylinder, the hob is located in the dregs transport cylinder and with frequency modulation motor's drive end is connected, first support is located dregs transport cylinder.
Preferably, the first support and the slag discharging port are close to the other end of the slag conveying cylinder.
Preferably, the pressurization system comprises an air compressor, a pressure regulating valve, a compressed air pipeline and a barometer, two ends of the compressed air pipeline are respectively connected with the sealed soil cabin and an output end of the air compressor, the pressure regulating valve is arranged on the compressed air pipeline, and the barometer is arranged on the sealed soil cabin.
Preferably, the slag adding and conveying device comprises a conveying device body, a sealed bulldozing piston, a hydraulic oil cylinder, a push rod and a reaction wall, the conveying device body comprises a slag adding and conveying cavity, two ends of the slag adding and conveying cavity are respectively connected with the sealed soil cabin and the sealed bulldozing piston, a slag adding and conveying port is arranged at the joint of the slag adding and conveying cavity and the sealed soil cabin, the slag adding port is communicated with the slag adding and conveying cavity, the hydraulic oil cylinder is arranged on the reaction wall, and the push rod is respectively connected with the sealed bulldozing piston and the driving end of the hydraulic oil cylinder.
Preferably, the soil-sealing device further comprises a support frame, and the support frame is respectively connected with the soil-sealing cabin and the conveying device body.
Preferably, the sealed soil cabin is provided with a sealed soil cabin slag adding opening and a sealed soil cabin cleaning opening.
Preferably, the soil pressure sensors are arranged in an inner cavity of the sealed soil cabin, the cross section of the inner cavity of the sealed soil cabin is circular, and the soil pressure sensors are more than two and symmetrically arranged on two sides of the central line of the inner cavity of the sealed soil cabin.
Preferably, the number of the soil pressure sensors on one side of the center line of the inner cavity of the sealed soil cabin is three, the soil pressure sensors are arranged up and down, the distance between the soil pressure sensors arranged up and down is 0.33m, and the distance between the soil pressure sensor arranged at the topmost end and the inner cavity of the sealed soil cabin is 0.17 m.
The scheme also discloses a test method of the test device for evaluating the muck improvement effect, and the test device based on the muck improvement effect evaluation comprises the following steps:
s1, configuring slag, loading the configured slag into the sealed soil cabin and the conveying device body through the slag adding port and the slag adding port of the sealed soil cabin, and closing a gate of a slag discharging port of the spiral slag discharging system;
s2, adjusting the pressurizing system to seal the air pressure value of the air pressure meter at the top of the soil cabin
To 0.2-0.3 MPa;
s3, starting the muck conveying device to discharge slag, opening a gate, adjusting the rotating speed of a frequency modulation motor and the propelling speed of a hydraulic oil cylinder, realizing dynamic balance of slag discharge and slag addition, and simulating the excavation and slag discharge process of a shield tunnel face;
s4, observing whether slag at the slag discharging port is smoothly and uniformly discharged and whether the fluidity of the slag meets the requirement;
s5, measuring the pressure value of the soil by the soil pressure sensor in the sealed soil cabin
With the air pressure value measured by the air pressure meter
Comparing the obtained results, wherein the units are megapascals, evaluating whether the improved residue soil is uniformly transmitted or not, and evaluating the transmission efficiency and the pressure transmission coefficient for the pressure transmission efficiency
It is shown that,
；
s6, the number of the soil pressure sensors is six, and the soil pressure value measured by the soil pressure sensors is used
Calculating to obtain the vertical pressure gradient of the tunnel face
，
The apparent density of the residue soil is obtained by further derivation, wherein the unit is horizontal soil pressure and megapascal, z is the vertical distance between a soil pressure sensor and a tunnel face and the unit is meter
The unit is ton per cubic meter, and the apparent density of the residue soil at the upper part of the sealed soil cabin
Apparent density of dregs at lower part of sealed soil cabin
And ideal density of residue soil
Comparing, wherein the unit is ton per cubic meter, evaluating the improvement effect of the muck in the soil cabin,
the distance between soil pressure sensors at the upper part of the sealed soil cabin is measured in meters,
the distance between soil pressure sensors at the lower part of the sealed soil cabin is measured in meters,
is the acceleration of gravity in meters per second 2 。
Compared with the prior art, the invention has the beneficial effects that:
this scheme compares with current indoor dregs improvement effect evaluation device and has following advantage: the physical and mechanical properties of the muck in the actual shield excavation and slag discharge processes can be simulated, and the muck soil discharge smoothness degree can be visually evaluated; the method can simulate the actual pressure value of the shield soil cabin, and evaluate whether the improved muck is homogeneous or not and has good fluidity and plasticity from the new angle of the transmission efficiency and the apparent density of the muck force; the device is reasonable in design and strong in operability, and a small-scale model test is carried out before actual shield construction, so that the construction efficiency can be improved, and the shield can be guaranteed to be safely tunneled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the connection between the inner wall surface of the soil containment chamber and the soil pressure sensor according to the present invention;
FIG. 3 is a schematic view of the arrangement of the soil pressure sensors of the present invention;
FIG. 4 is a schematic view of the position structure of the slag adding port and the cleaning port of the sealed soil cabin of the continuous slag adding system of the invention;
FIG. 5 is a schematic view of the installation positions of the slag adding port, the barometer and the compressed air pipeline of the sealed soil cabin of the invention;
wherein: 1-a frequency modulation motor, 2-a first bracket, 3-a slag discharge port, 3-1-a gate, 4-a slag conveying cylinder, 4-1-a slag conveying port, 5-a support frame, 5-a connecting part of the support frame and a sealed soil cabin, 6-a soil pressure sensor, 6-1-a first soil pressure sensor, 6-2-a second soil pressure sensor, 6-3-a third soil pressure sensor, 6-4-a fourth soil pressure sensor, 6-5-a fifth soil pressure sensor, 6-6-a sixth soil pressure sensor, 7-a sealed soil cabin, 8-a barometer, 9-a compressed air pipeline, 10-a pressure regulating valve, 11-an air compressor and 12-a slag adding port, 13-sealing a bulldozing piston, 14-hydraulic oil cylinder, 15-counterforce wall, 16-inner cavity, 16-1-sealing a slag adding port of an earth cabin, 16-2-continuously adding a slag system slag adding port and 16-3-sealing an earth cabin cleaning port.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Unless defined otherwise, all 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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example (b): as shown in fig. 1 to 5, the present embodiment provides a testing apparatus for evaluating the effect of improving slag soil, which includes a spiral slag tapping system, a pressurization system, a continuous slag adding system, a pressure sensor system, and a sealed soil cabin 7;
the spiral slag discharging system comprises a slag conveying device, a slag discharging port 3 and a slag conveying port 4-1, wherein the slag conveying device is connected with the sealed soil cabin 7 through the slag conveying port, and the slag discharging port 3 is connected with the slag conveying device;
the pressurizing system is connected with the sealed soil cabin 7 and is used for adjusting the air pressure in the sealed soil cabin 7;
the pressure sensor system comprises a soil pressure sensor 6 arranged in a sealed soil cabin 7;
the continuous slag adding system comprises a slag adding conveying device, a slag adding port 12 and a slag adding conveying port, wherein the slag adding conveying device is connected with the sealed soil cabin 7 through the slag adding conveying port, and the slag adding port 12 is connected with the slag adding conveying device.
In this embodiment, it is concrete, dregs conveyor includes dregs transport cylinder 4, the hob, frequency modulation motor 1 and first support 2, the one end and the sealed soil cabin 7 of dregs transport cylinder 4 are connected, dregs transport port locates the junction of dregs transport cylinder 4 and sealed soil cabin 7, frequency modulation motor 1 locates the other end of dregs transport cylinder 4, the hob is located in dregs transport cylinder 4 and is connected with frequency modulation motor 1's drive end, dregs transport cylinder 4 is located to first support 2.
Specifically, the first support 2 and the slag discharge port 3 are close to the other end of the slag conveying cylinder 4.
Specifically, the pressurization system comprises an air compressor 11, a pressure regulating valve 10, a compressed air pipeline 9 and a barometer 8, wherein two ends of the compressed air pipeline 9 are respectively connected with the sealed soil cabin 7 and the output end of the air compressor 11, the pressure regulating valve 10 is arranged on the compressed air pipeline 9, and the barometer 8 is arranged on the sealed soil cabin 7.
Concretely, add sediment conveyor and include the conveyor body, sealed bulldozing piston 13, hydraulic cylinder 14, ejector pin and reaction wall 15, the conveyor body is including adding the sediment transport cavity, the both ends that add the sediment transport cavity respectively with sealed soil cabin 7, sealed bulldozing piston 13 is connected, it locates to add the sediment transport port and adds the junction of sediment transport cavity and sealed soil cabin 7, it communicates with each other with sediment transport cavity to add sediment port 12, hydraulic cylinder 14 locates reaction wall 15, ejector pin respectively with sealed bulldozing piston 13, hydraulic cylinder 14's drive end is connected.
Specifically, the device further comprises a support frame 5, and the support frame 5 is connected with the sealed soil cabin 7 and the conveying device body respectively.
Specifically, the sealed soil cabin 7 is provided with a sealed soil cabin slag adding opening 16-1 and a sealed soil cabin cleaning opening 16-3.
Specifically, the soil pressure sensors 6 are arranged in an inner cavity 16 of the sealed soil cabin 7, the cross section of the inner cavity 16 of the sealed soil cabin 7 is circular, and the number of the soil pressure sensors 6 is more than two and is symmetrically arranged on two sides of the central line of the inner cavity 16 of the sealed soil cabin 7.
Specifically, the number of the soil pressure sensors 6 on one side of the center line of the inner cavity 16 of the sealed soil cabin 7 is three, the soil pressure sensors 6 are arranged up and down, the distance between the soil pressure sensors 6 arranged up and down is 0.33m, and the distance between the soil pressure sensor 6 at the topmost end and the inner cavity 16 of the sealed soil cabin 7 is 0.17 m.
In fig. 2 and 4, the semicircular broken line structure is a circular cutter head simulating a shield machine, so that the understanding is facilitated.
The working principle of the scheme is as follows:
realizes the dynamic balance of slag discharge and slag addition by adjusting the slag conveying device and the slag adding conveying device, and according to whether the slag discharge of the slag conveying device is smooth or not and the soil pressure monitoring value of the sealed soil cabin 7
The air pressure value of the air pressure meter 8
Comparing to obtain the force transmission coefficient of the residue soil
Apparent density
And ideal density of residue soil
And if the difference is large, the comprehensive effect evaluation of the improved residue soil is realized. The improved muck is filled into a sealed soil cabin 7, and the pressure value in the sealed soil cabin 7 is adjusted through a pressurization system; the improved muck is filled into the slag adding system through a slag adding opening, slag discharging and slag adding dynamic balance are realized by adjusting the muck conveying device and the slag adding conveying device, and whether the improved fluidity of the muck meets the requirement or not can be evaluated by judging whether the slag discharging is smooth or not; the soil pressure sensor 6 is connected with a PC end data acquisition instrument through a data transmission line, the transmission efficiency of the improved muck pressure is judged by comparing the pressure value measured by the soil pressure sensor 6 on the wall of the sealed soil cabin 7 with the pressure value at the top of the sealed soil cabin 7, meanwhile, the tunnel face pressure gradient can be calculated according to the pressure value, the apparent density of muck is deduced and compared with the ideal muck density, and therefore the effect of improving muck is evaluated; wherein the volume of the air compressor 11 is 0.3m 3 The nominal pressure was 0.8 MPa. The whole soil cabin model device can transmit the fluidity and the pressureAnd comprehensively evaluating whether the improved muck meets the shield construction requirements or not according to the three aspects of the delivery efficiency and the apparent density.
The scheme also comprises a test method of the test device for evaluating the muck improvement effect, which comprises the following steps:
s1, configuring slag, loading the slag into the sealed soil cabin 7 and the conveying device body through the slag adding port 16-1 and the slag adding port 12 of the sealed soil cabin, and closing a gate 3-1 of a slag discharging port 3 of the spiral slag discharging system;
s2, adjusting the pressurizing system to seal the air pressure value of the air pressure meter 8 at the top of the soil cabin 7
To 0.2-0.3 MPa;
s3, starting the muck conveying device to discharge slag, opening a gate 3-1, adjusting the rotating speed of a frequency modulation motor 1 and the propelling speed of a hydraulic oil cylinder 14, realizing slag discharging and slag adding dynamic balance, and simulating the excavation and slag discharging process of a shield tunnel face;
s4, observing whether slag at the slag discharge port 3 is smoothly and uniformly discharged and whether the fluidity of the slag meets the requirement;
s5, measuring the pressure value of the soil by the soil pressure sensor in the sealed soil cabin
With the air pressure value measured by the air pressure meter
Comparing the obtained results, wherein the units are megapascals, evaluating whether the improved residue soil is uniformly transmitted or not, and evaluating the transmission efficiency and the pressure transmission coefficient for the pressure transmission efficiency
It is shown that,
；
s6, the number of the soil pressure sensors is six, and the soil pressure value measured by the soil pressure sensors is used
Calculating to obtain the vertical pressure gradient of the tunnel face
，
The apparent density of the residue soil is obtained by further derivation, wherein the unit is horizontal soil pressure and megapascal, z is the vertical distance between a soil pressure sensor and a tunnel face and the unit is meter
The unit is ton per cubic meter, and the apparent density of the residue soil at the upper part of the sealed soil cabin
Apparent density of dregs at lower part of sealed soil cabin
And ideal density of residue soil
Comparing, wherein the unit is ton per cubic meter, evaluating the improvement effect of the muck in the soil cabin,
the distance between soil pressure sensors at the upper part of the sealed soil cabin is measured in meters,
the distance between soil pressure sensors at the lower part of the sealed soil cabin is measured in meters,
is the acceleration of gravity in meters per second 2 。
The soil pressure sensor 6 includes: a first soil pressure sensor 6-1, a second soil pressure sensor 6-2, a third soil pressure sensor 6-3, a fourth soil pressure sensor 6-4 and a fifth soil pressureA force sensor 6-5 and a sixth soil pressure sensor 6-6, wherein the soil pressure value measured by the corresponding soil pressure sensor is
Referring to fig. 3, the above pressure values are measured sequentially in a clockwise direction by the soil pressure sensor located at the highest point on the right side of the center line of the inner cavity of the sealed soil cabin.
This scheme compares with current indoor dregs improvement effect evaluation device and has following advantage: the physical and mechanical properties of the muck in the actual shield excavation and slag discharge processes can be simulated, and the muck soil discharge smoothness degree can be visually evaluated; the method can simulate the actual pressure value of the shield soil cabin, and evaluate whether the improved muck is homogeneous or not and has good fluidity and plasticity from the new angle of the transmission efficiency and the apparent density of the muck force; the device is reasonable in design and strong in operability, and a small-scale model test is carried out before actual shield construction, so that the construction efficiency can be improved, the shield is guaranteed to be safely tunneled, and the original material property is saved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A test device for evaluating the improvement effect of slag soil is characterized by comprising a spiral slag discharging system, a pressurizing system, a continuous slag adding system, a pressure sensor system and a sealed soil cabin;
the spiral slag discharging system comprises a slag conveying device, a slag discharging port and a slag conveying port, the slag conveying device is connected with the sealed soil cabin through the slag conveying port, and the slag discharging port is connected with the slag conveying device;
the pressurization system is connected with the sealed soil cabin and is used for adjusting the air pressure in the sealed soil cabin;
the pressure sensor system comprises a soil pressure sensor which is arranged in the sealed soil cabin;
the continuous slag adding system comprises a slag adding conveying device, a slag adding port and a slag adding conveying port, wherein the slag adding conveying device is connected with the sealed soil cabin through the slag adding conveying port, and the slag adding port is connected with the slag adding conveying device.
2. The testing device for evaluating the effect of improving the residual soil according to claim 1, wherein the residual soil conveying device comprises a residual soil conveying cylinder, a screw rod, a frequency modulation motor and a first bracket, one end of the residual soil conveying cylinder is connected with the sealed soil cabin, the residual soil conveying port is arranged at the joint of the residual soil conveying cylinder and the sealed soil cabin, the frequency modulation motor is arranged at the other end of the residual soil conveying cylinder, the screw rod is arranged in the residual soil conveying cylinder and is connected with the driving end of the frequency modulation motor, and the first bracket is arranged on the residual soil conveying cylinder.
3. The testing device for evaluating the effect of improving the residual soil according to claim 2, wherein the first bracket and the slag discharging port are close to the other end of the residual soil conveying cylinder.
4. The testing device for evaluating the effect of improving the muck as defined in claim 1, wherein the pressurizing system comprises an air compressor, a pressure regulating valve, a compressed air pipeline and a barometer, two ends of the compressed air pipeline are respectively connected with the sealed soil cabin and an output end of the air compressor, the pressure regulating valve is arranged in the compressed air pipeline, and the barometer is arranged in the sealed soil cabin.
5. The test device for evaluating the improving effect of the muck as defined in claim 1, wherein the slag adding and conveying device comprises a conveying device body, a sealed bulldozing piston, a hydraulic oil cylinder, a push rod and a reaction wall, the conveying device body comprises a slag adding and conveying cavity, two ends of the slag adding and conveying cavity are respectively connected with the sealed soil cabin and the sealed bulldozing piston, the slag adding and conveying port is arranged at a joint of the slag adding and conveying cavity and the sealed soil cabin, the slag adding port is communicated with the slag adding and conveying cavity, the hydraulic oil cylinder is arranged on the reaction wall, and the push rod is respectively connected with driving ends of the sealed bulldozing piston and the hydraulic oil cylinder.
6. The testing device for evaluating the improvement effect of the muck according to claim 5, further comprising a support frame, wherein the support frame is respectively connected with the sealed soil cabin and the conveying device body.
7. The test device for evaluating the improvement effect of the muck according to claim 5, wherein the sealed soil cabin is provided with a sealed soil cabin slag adding opening and a sealed soil cabin cleaning opening.
8. The testing device for evaluating the effect of improving the soil residues according to claim 1, wherein the soil pressure sensors are arranged in an inner cavity of the sealed soil cabin, the cross section of the inner cavity of the sealed soil cabin is circular, and the soil pressure sensors are more than two and symmetrically arranged on two sides of the center line of the inner cavity of the sealed soil cabin.
9. The testing apparatus for evaluating an effect of improving soil slag according to claim 8, wherein the number of the soil pressure sensors located on one side of the center line of the inner cavity of the sealed soil chamber is three or more, the soil pressure sensors are vertically disposed, the distance between the vertically disposed soil pressure sensors is 0.33m, and the distance between the topmost soil pressure sensor and the inner cavity of the sealed soil chamber is 0.17 m.
10. A test method of a test apparatus for evaluating a soil improvement effect, characterized in that the test apparatus for evaluating a soil improvement effect according to any one of claims 1 to 9 comprises the steps of:
s1, configuring slag, loading the configured slag into the sealed soil cabin and the conveying device body through the slag adding port and the slag adding port of the sealed soil cabin, and closing a gate of a slag discharging port of the spiral slag discharging system;
s2, adjusting the pressurizing system to seal the air pressure value of the air pressure meter at the top of the soil cabin
To 0.2-0.3 MPa;
s3, starting the muck conveying device to discharge slag, opening a gate, adjusting the rotating speed of a frequency modulation motor and the propelling speed of a hydraulic oil cylinder, realizing dynamic balance of slag discharge and slag addition, and simulating the excavation and slag discharge process of a shield tunnel face;
s4, observing whether slag at the slag discharging port is smoothly and uniformly discharged and whether the fluidity of the slag meets the requirement; s5, measuring the pressure value of the soil by the soil pressure sensor in the sealed soil cabin
With the air pressure value measured by the air pressure meter
Comparing the obtained results, wherein the units are megapascals, evaluating whether the improved residue soil is uniformly transmitted or not, and evaluating the transmission efficiency and the pressure transmission coefficient for the pressure transmission efficiency
It is shown that,
；
s6, the number of the soil pressure sensors is six, and the soil pressure value measured by the soil pressure sensors is used
Calculating to obtain the vertical pressure gradient of the tunnel face
，
Is waterThe apparent density of the muck is further deduced by taking the unit of the earth pressure as megapascal, the unit of z as the vertical distance between the earth pressure sensor and the tunnel face as meter
The unit is ton per cubic meter, and the apparent density of the residue soil at the upper part of the sealed soil cabin
Apparent density of dregs at lower part of sealed soil cabin
And ideal density of residue soil
Comparing, wherein the unit is ton per cubic meter, evaluating the improvement effect of the muck in the soil cabin,
the distance between soil pressure sensors at the upper part of the sealed soil cabin is measured in meters,
the distance between soil pressure sensors at the lower part of the sealed soil cabin is measured in meters,
is the acceleration of gravity in meters per second 2 。
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