CN107290261B - Device for simulating seepage generation in model geological body - Google Patents
Device for simulating seepage generation in model geological body Download PDFInfo
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- CN107290261B CN107290261B CN201710414750.7A CN201710414750A CN107290261B CN 107290261 B CN107290261 B CN 107290261B CN 201710414750 A CN201710414750 A CN 201710414750A CN 107290261 B CN107290261 B CN 107290261B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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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
Abstract
The invention discloses a device for simulating seepage generation in a model geological body, which comprises a model box body, wherein a simulation tunnel is arranged in the middle of the model box body, a set of water supply pipeline systems are respectively arranged on two sides of the model box body, and the water supply pipeline systems are connected with an automatic pressurizing device to provide simulated seepage with different pressures; the water supply pipeline system comprises a plurality of stages of branch pipes embedded into the model box body, water entering the water supply pipeline system is divided, and the branch pipe at the last stage is provided with a seepage hole to realize a seepage effect. The invention disperses the water supply pressure through the multi-stage branch pipes, can better simulate seepage and ensures the simulation effect.
Description
Technical Field
The invention relates to a device for simulated seepage generation in a model geological body.
Background
A large amount of gap water and joint crack water are added in the natural geological body, and the excavation construction of underground engineering changes the initial stress field and the seepage field of the original rock and causes the mechanical and deformation characteristics of the rock mass to change. The three-dimensional geomechanical model test is one of important means for researching underground engineering, and can intuitively and vividly reflect the mechanics and deformation rules of rock masses in the excavation process, and the research means and method are mutually complemented and verified with numerical simulation calculation and on-site in-situ monitoring, so that the important reference value and significance are provided for accurately predicting and judging the mechanics and deformation rules of rock masses under complex geological conditions, optimizing the rock mass excavation technical process, the underground engineering supporting technical scheme and the like. For a long time, seepage generation and seepage field authenticity simulation in a three-dimensional geomechanical model test are one of the key technologies influencing the data accuracy of the model test. The device system for generating seepage disclosed by the applicant realizes the real simulation of a prototype seepage field to the maximum extent, improves the precision of test data and promotes the progress of a three-dimensional geomechanical model test technology.
The method comprises the following steps of excavating underground engineering or a rock tunnel, releasing ground stress, changing original ground stress, redistributing surrounding rock stress, changing a geological structure of the surrounding rock, changing a surrounding rock stress field and a seepage field, further deteriorating the quality of the surrounding rock by the coupling effect of the surrounding rock stress field and the seepage field, aggravating the deformation of the surrounding rock, increasing the rock pressure of a two-liner supporting structure by extending and penetrating a joint crack of the surrounding rock, directly acting high osmotic water pressure on the outer surface of the two liners, increasing the outer water pressure of the liners, and adversely affecting the stability difference of the supporting structure. The research on the high-permeability hydraulic characteristic and the motion rule of the high-permeability hydraulic characteristic in the excavated rock mass has important significance on excavation supporting, water inrush prevention, rock mass collapse and the like of the rock mass.
The geomechanical model test can accurately give the effect of the underground water on the rock mass structural plane and the secondary lining structure, and provides support for feedback correction of rock mass parameters.
Disclosure of Invention
The invention provides a device for simulating seepage generation in a model geologic body, which solves the problems, overcomes the defects of the existing seepage simulation technology in a model test, and has the advantages of simple structure, easy manufacture and installation and low material cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for simulating seepage generation in a model geologic body comprises a model box body, wherein a simulation tunnel is arranged in the middle of the model box body, a set of water supply pipeline systems are respectively arranged on two sides of the model box body, and the water supply pipeline systems are connected with an automatic pressurizing device to provide simulated seepage with different pressures;
the water supply pipeline system comprises a plurality of stages of branch pipes embedded into the model box body, water entering the water supply pipeline system is divided, and the branch pipe at the last stage is provided with a seepage hole to realize a seepage effect.
The water supply pipeline system comprises two water supply tanks, the two water supply tanks are different in height, and the relative pressure difference of the water inside the water supply tanks is different.
The water supply pipeline system at least comprises one-level branch pipes, two-level branch pipes and three-level branch pipes, the two one-level branch pipes are communicated with different water supply tanks respectively, the two-level branch pipes are arranged on the one-level branch pipes, and the tail ends of the two-level branch pipes are provided with three-level branch pipes extending into the model box body.
Furthermore, a plurality of water seepage holes are formed in the third-stage branch pipe.
Furthermore, the third-level branch pipe is wound with hemp threads, so that water seepage holes in the wall of the model material flower pipe are prevented from being blocked.
Furthermore, be provided with a plurality of four-way pipes on the one-level bleeder to extend and connect different second grade bleeder, make the water supply direction change.
Furthermore, the structures of the secondary branch pipes are consistent, so that the uniformity of water supply dispersion is ensured.
Furthermore, the water supply tank is provided with an automatic pressurizing device, and a pressure gauge is arranged in the water supply tank to adjust the water supply pressure in real time.
Furthermore, the seepage holes are uniformly distributed in a matrix type so as to maintain the stability and uniformity of seepage.
Further, the third-stage branch pipe has an arc such that the water supply direction is changed from a direction parallel to the side of the mold box to a vertical direction.
Further, a secondary lining is arranged on the outer surface of the tunnel.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the water supply pressure is dispersed through the multistage branch pipes, so that seepage simulation can be better carried out, and the simulation effect is ensured;
(2) the three-stage branch pipe is provided with seepage holes so that pressure water flows out and diffuses into the model body or flows along corresponding seepage paths such as joint cracks; and the hollow cavity is not blocked by fine grain materials when the model is manufactured by winding hemp threads.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a front view of the tank side and primary and secondary manifold systems of the present invention;
FIG. 3 is a side view of the connection between the steel plate on the side of the water tank, the first-stage branch pipe and the second-stage branch pipe penetrating through the steel plate and the perforated pipe according to the present invention;
FIG. 4 is a schematic view of the anti-clogging copper tube of the present invention;
FIG. 5 is a schematic view of a secondary manifold of the present invention;
the anti-blocking type water tank comprises (1) a first-stage branch pipe, (2) a second-stage branch pipe, (3) an anti-blocking fancy copper pipe, (4) a pressure water source box, (5) a water supply pipe, (6) a simulated excavation tunnel, (7) a secondary lining, (8) a steel plate on the side surface of the water tank, (9) a four-way pipe, (10) a small circular hole in the wall of the copper pipe, and (11) threads on the wall of the flower copper pipe.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
An apparatus system for simulated seepage generation within a model geological volume comprising: the anti-blocking type water supply device comprises a water supply pipe, a pressure water source box, an automatic pressurizing device, a first-stage branch pipe, a second-stage branch pipe, an anti-blocking type copper pipe and the like, wherein the first-stage branch pipe is located on the side face of a model box body, two branch pipes are arranged on each side face, one lower end of each branch pipe penetrates into a lower pressure water tank, and the other lower end of each branch pipe.
The upper and lower water source tanks can provide pressure water with different pressure differences.
The second-stage branch pipes are made of plastic and are fixed on the side plates of the model box body, one ends of the second-stage branch pipes are fixed on the lateral steel plates through nuts and penetrate through the steel plates to be communicated with the copper floral tubes, and the other ends of the second-stage branch pipes are connected with the first-stage branch pipes.
The floral tube is made of copper, small round holes distributed in a plum blossom shape are drilled in the wall of the floral tube, and hemp threads are wound on the floral tube to prevent the small round holes in the floral tube wall of the model material from being blocked.
The water in the pressure water tank is supplied after being pressurized by an external water source through a water supply pipe, and the pressure value of the water can be determined by an instrument panel and can be automatically regulated and pressurized according to the requirement. Two side surfaces of the model test box body are provided with two primary branch pipes perpendicular to the water tank, one branch pipe is communicated with the lower water tank, and the other branch pipe is communicated with the upper water tank.
Secondary branch pipe: the first-level branch pipe at the top of the water tank is communicated with 8 second-level branch pipes, the outlet ends of the second-level branch pipes penetrate through the steel plate and are communicated with the horizontal copper floral tubes embedded in the material, and the total number of the branch pipes at the two sides is 32.
A floral tube: the perforated pipe is made of a copper pipe with a smaller diameter, a plurality of small round holes are drilled in the wall of the copper pipe, pressure water flows seep out of the small round holes and flow into the model material body, and a layer of thin hemp threads is wound on the wall of the pipe to prevent the small round holes from being blocked.
In a typical embodiment of the present application, as shown in fig. 1, there is provided a device system for simulated seepage generation in a model geologic body, comprising an upper water tank automatic water storage device (1), an upper water tank automatic pressurizing device (2), a lower water tank automatic water storage device (3), a lower water tank automatic pressurizing device (4), a water supply main pipe (5), a primary branch pipe (6), a secondary branch pipe (7), a blockage-preventing copper pipe (8), a simulated excavation tunnel (9), a water supply tank (10) and the like. The automatic pressurizing devices (2) and (4) automatically pressurize water in the water source box body (10), pressure water enters the first-stage branch pipe (6) from the upper water tank and the lower water tank, enters the second-stage branch pipe (7) from the first-stage branch pipe (6), enters the anti-blocking fancy copper pipe (8) from the second-stage branch pipe (7), and then diffuses and permeates into a model material from the anti-blocking fancy copper pipe (8).
The pressure difference of the pressure water in the water source box (10) can be automatically adjusted according to design requirements, and the upper water source box and the lower water source box respectively provide seepage water with different pressure differences for the model body of the model material.
Each side of the outlet of the secondary branch pipe (7) is provided with 16, the two sides of the outlet are 32, and the anti-blocking fancy copper pipe (8) enters the model material by 5cm from the steel plate on the side surface of the model box body and is fixed on the steel plate on the side surface.
The secondary branch pipe (7) is made of plastic materials, and the anti-blocking fancy copper pipe (8) is made of copper materials.
The anti-clogging fancy copper pipe (8) is made of copper material, and the pipe wall is drilled with small round holes distributed in a plum blossom shape, so that pressure water flows out and diffuses into the model body or flows along the corresponding joint crack isosmotic flow paths.
The small round holes distributed in a plum blossom shape on the wall of the anti-blocking fancy copper pipe (8) are wound by hemp threads, and fine particle materials cannot block the holes when the model is manufactured.
The seepage generation experimental device system can realize high-simulation of seepage in a three-dimensional model geological body and can accurately simulate the evolution rule of a seepage field in the tunnel excavation process. Compared with seepage monitoring in actual engineering, the simulation system has high simulation degree, avoids interference of various construction factors in the actual engineering, and can perform long-term tracking simulation on a seepage field.
The specific working process of the invention is as follows:
outside water supply system supplies water through (5) in two upper and lower water tanks, and the pressure water in two upper and lower water tanks is surveyed by device (12) through water pressure, and the water in the upper and lower water tank is carried upwards through one-level branch pipe (1), and the pressure water in branch pipe (1) passes through second grade branch pipe (2) flow direction and buries flower copper pipe (3) in the model material, and the pressure water in the flower copper pipe passes through little round hole 10 (see fig. 3) on the copper pipe wall and flows into inside the model material, generates the seepage field. After the model material is excavated, the seepage field is changed. And the seepage field gradually tends to a stable state after the secondary lining (7) is finished. (8) Is a lateral steel plate of the model, and (12) is a water pressure gauge.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (6)
1. A device for simulated seepage generation in a model geologic body, characterized by: the device comprises a model box body, wherein a simulation tunnel is arranged in the middle of the model box body, two sides of the model box body are respectively provided with a set of water supply pipeline system, and the water supply pipeline systems are connected with an automatic pressurizing device to provide simulation seepage flow with different pressures;
the water supply pipeline system comprises a plurality of stages of branch pipes embedded into the model box body, the water entering the water supply pipeline system is divided, and the branch pipe at the last stage is provided with a seepage hole to realize a seepage effect;
the water supply pipeline system comprises two water supply tanks, the two water supply tanks are arranged at different heights, and the relative pressure difference of water in the water supply tanks is different;
the water supply pipeline system at least comprises a first-stage branch pipe, a second-stage branch pipe and a third-stage branch pipe, wherein the number of the first-stage branch pipes is two, the first-stage branch pipes are respectively communicated with different water supply tanks, a plurality of second-stage branch pipes are arranged on the first-stage branch pipes, and the tail ends of the second-stage branch pipes are provided with the third-stage branch pipes extending into the model box body;
be provided with a plurality of infiltration holes on the tertiary bleeder, be provided with a plurality of four-way pipes on the one-level bleeder to extend and connect different second grade bleeder, make the direction of supplying water change.
2. The apparatus for simulated seepage formation in a model geologic volume of claim 1, wherein: the winding of tertiary bleeder has the hemp silk, prevents that the infiltration hole on the model material colored pipe wall from blockking up.
3. The apparatus for simulated seepage formation in a model geologic volume of claim 1, wherein: the structures of the secondary branch pipes are consistent so as to ensure the uniformity of water supply dispersion.
4. The apparatus for simulated seepage formation in a model geologic volume of claim 1, wherein: the water supply tank is provided with an automatic pressurizing device, and a pressure gauge is arranged in the water supply tank to adjust water supply pressure in real time.
5. The apparatus for simulated seepage formation in a model geologic volume of claim 1, wherein: the seepage holes are uniformly distributed in a matrix form to maintain the stability and uniformity of seepage.
6. The apparatus for simulated seepage formation in a model geologic volume of claim 1, wherein: the third-stage branch pipe has an arc so that the water supply direction is changed from a direction parallel to the side surface of the model box body to a vertical direction.
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| CN201710414750.7A CN107290261B (en) | 2017-06-05 | 2017-06-05 | Device for simulating seepage generation in model geological body |
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| CN107290261B true CN107290261B (en) | 2020-02-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108267563A (en) * | 2018-02-06 | 2018-07-10 | 山东交通学院 | A kind of water supply installation and application method of large-scale three dimensional geologic model test |
| CN109783913B (en) * | 2018-12-30 | 2023-07-14 | 中铁十四局集团有限公司 | Tunnel support structure selection method and device |
| CN109828308B (en) * | 2019-03-01 | 2020-11-06 | 山东大学 | Geophysical geoelectrical model test device and method |
| CN111983193A (en) * | 2020-08-26 | 2020-11-24 | 西南交通大学 | High ground temperature country rock tunnel structure analogue test device |
| CN112414915B (en) * | 2020-11-02 | 2022-07-29 | 山东大学 | Test system and method for simulating tunnel excavation seepage change under complex geological conditions |
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| CN103091214A (en) * | 2011-10-29 | 2013-05-08 | 成都理工大学 | Under-dam seepage flow experiment apparatus |
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| CN204302275U (en) * | 2014-12-29 | 2015-04-29 | 四川农业大学 | A kind of soil in protected field moisture and salt regime experimental rig of improvement |
| CN105223121A (en) * | 2015-10-22 | 2016-01-06 | 桂林理工大学 | A kind of test method simulating swelling clay rock tunnel rainfall infiltration |
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| CN103091214A (en) * | 2011-10-29 | 2013-05-08 | 成都理工大学 | Under-dam seepage flow experiment apparatus |
| CN103389260A (en) * | 2013-07-18 | 2013-11-13 | 上海交通大学 | Laboratory simulation test method for researching underground water seepage obstruction caused by pile foundation |
| CN103760318A (en) * | 2014-01-13 | 2014-04-30 | 四川大学 | Bidirectional penetration model testing device suitable for soil-rock slopes |
| CN104005363A (en) * | 2014-06-13 | 2014-08-27 | 东南大学 | Three-dimensional underground pressure-bearing water flow-subway tunnel structure interaction simulating device |
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