CN111415566A - Model test device and method for researching interaction relation between landslide body and tunnel - Google Patents
Model test device and method for researching interaction relation between landslide body and tunnel Download PDFInfo
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- CN111415566A CN111415566A CN202010312647.3A CN202010312647A CN111415566A CN 111415566 A CN111415566 A CN 111415566A CN 202010312647 A CN202010312647 A CN 202010312647A CN 111415566 A CN111415566 A CN 111415566A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/40—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for geology
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
Abstract
A model test device and method for studying interaction relation of a landslide body and a tunnel, the device comprises a square box body, the front wall and the rear wall of which are formed by a group of organic glass plates which can move correspondingly, wherein one organic glass plate is provided with a hole for simulating an inlet and an outlet of the tunnel; the top of the box body is provided with a sprinkler pipe; and the other group of tunnel models with the same hole shape and holes are arranged. The research method comprises preparing soil material; after the hole is sealed, an organic glass plate is arranged, so that the position of the hole is consistent with the position of the inlet and the outlet of the tunnel; manufacturing a landslide body model, embedding a tunnel model with a strain gauge and a soil pressure box on the surface, and placing a dial indicator on the landslide body; simulating dry season or rainy season construction of the tunnel through a sprinkling pipe, excavating the tunnel, and researching interaction between the landslide body and the tunnel in construction in different seasons through monitored landslide body displacement and strain and soil body stress of a tunnel model; the interaction between the landslide body and the tunnel at different excavation positions of the tunnel is researched by changing the hole position. The research method can provide scientific basis for tunnel design and construction.
Description
Technical Field
The invention relates to the technical field of highway tunnels, in particular to a model test device and a method for researching the interaction relation between a landslide body and a tunnel.
Background
With the annual increase of the road network operation mileage of China, the terrain and the geology of roads facing the road construction are more and more complicated. When the engineering technicians encounter complex engineering practical problems, more technical means are required for research, wherein model tests are a common research method.
In highway construction engineering, a tunnel is required to be excavated at the lower part of a slope body when encountering a hillside, and in order to ensure the stability of the slope body and the construction safety of the tunnel, the interaction relationship between different types of landslide bodies and tunnels needs to be researched. At present, the research on the type is mostly carried out after the tunnel is built in China, and the model test device is utilized to research the interaction relation between the landslide body and the tunnel before the tunnel is designed and constructed, so that a scientific basis is provided for the tunnel design and construction.
Disclosure of Invention
Aiming at the problems, the invention provides a model test device for researching the interaction relation between a landslide body and a tunnel and a method for researching the interaction relation between the landslide body and the tunnel by using the model test device, and provides scientific basis for tunnel design and construction.
The model test device for researching the interaction relation between the landslide body and the tunnel comprises a square box body, wherein the front wall and the rear wall of the box body are formed by a group of transparent organic glass plates which are mutually corresponding and can move left and right and are different in width, the lower part of one organic glass plate is provided with a hole for simulating an inlet and an outlet of the tunnel, and the upper position and the lower position of the hole relative to the side wall of the box body are adjustable; the top of the box body is provided with a group of sprinkling pipes which are uniformly distributed at intervals and can control water inlet through a valve; and the other group of tunnel models are provided with holes which have the same shape as the holes, the wall thickness of the tunnel models is 15mm, and the axial length of the tunnel models is 10 cm.
When the model test device is used for researching the interaction relation between the landslide mass and the tunnel, soil mass is loaded in a box body of the model device according to specific engineering geological conditions, the landslide mass formed by various terrains and geological conditions is simulated, and monitoring devices are arranged above and in the soil mass of the landslide mass; then, a tunnel is excavated through the hole, water is reduced through a sprinkler pipe as required, and the interaction relation between the landslide body with different terrain and geological conditions and the tunnel under different construction conditions is simulated through related data monitored by a monitoring device. The method comprises the following specific steps:
1) preparing a soil body material with a material similarity ratio to the landslide body soil body according to the geological condition of a specific engineering site and the similar principle of geotechnical tests;
2) after the holes are sealed by using an adhesive tape, the organic glass plates forming the front wall and the rear wall of the box body are installed, and the positions of the holes are matched with the set positions of the inlet and the outlet of the tunnel by adjusting the mutual positions of the organic glass plates and the upper and lower positions of the holes;
3) filling the soil mass material prepared in the step 1) in the device according to the terrain condition of a specific engineering site, and preparing a landslide mass model according to a set geometric similarity ratio; embedding tunnel models which are coaxial with the tunnel and are mutually spaced by 20cm in the landslide body model, respectively placing strain gauges on the upper parts of two opposite sides of the outer surface of each tunnel model, and placing soil pressure boxes on the tops of the tunnel models, wherein the strain gauges and the soil body stress are respectively used for monitoring the strain of the tunnel models and the soil body stress; setting a dial indicator above the soil body of the landslide body for monitoring the displacement of the landslide body;
4) removing the adhesive tape, simulating dry construction or rainy construction of a tunnel by closing (dry construction) or opening (rainy construction) a valve of a sprinkler pipe according to the weather rainfall condition of an engineering construction site, excavating a soil body through a hole, collecting landslide body displacement monitored by a dial indicator above the landslide body soil body and strain on the outer surface of a tunnel model and strain and soil body stress of the tunnel model monitored by a soil pressure box, researching the interaction relation between the landslide body and the tunnel for constructing the terrain and geological conditions in different seasons (dry or rainy), and providing scientific basis for tunnel design and construction;
5) the left and right positions of the holes are changed by moving the mutual positions of the organic glass plates on the front wall and the rear wall of the box body, so that different excavation positions of the tunnel are simulated; and (3) repeating the operations of the steps 1) to 4), researching the interaction relation between the landslide body under the terrain and geological conditions and the tunnel at different excavation positions of the tunnel in different seasons (dry seasons or rainy seasons), and providing scientific basis for the design and construction of the tunnel.
The invention has the beneficial effects that:
1. the invention can utilize the landslide body models which are manufactured in the test device and simulate different geological conditions to carry out tunnel excavation simulation tests according to the geological conditions of different engineering sites, can research the influence of tunnel excavation on the landslide body and the influence of landslide body sliding on the tunnel below under the same geological condition when the same geological condition is constructed in different seasons (dry seasons or rainy seasons), and provides scientific basis for tunnel design and construction.
2. The method can research the influence of tunnel excavation on the landslide body and the influence of landslide body sliding on the tunnel below under different geological conditions in different seasons (dry seasons or rainy seasons) by changing the physical and mechanical parameters and the rainfall condition of the soil body, and provides scientific basis for tunnel design and construction.
3. The method can simulate the influence of the excavation of the tunnel at different positions below the landslide body on the upper landslide body and the influence of the sliding of the landslide body on the tunnel below by adjusting the position of the organic glass plate and the position of the hole under the same geological condition, and provides scientific basis for the design and construction of the tunnel.
Drawings
The accompanying drawings are schematic diagrams of embodiments of the invention, in which:
FIG. 1 is an elevational view of a model test apparatus;
FIG. 2 is a side elevational view of the model test apparatus;
FIG. 3 is a bottom plan view of the model test apparatus;
FIG. 4 is a top plan view of the model test apparatus;
FIG. 5 is a front view of the plexiglass plate No. 1 of FIG. 1;
FIG. 6 is a three-dimensional schematic view of a tunnel model in a model testing apparatus;
FIG. 7 is a side sectional view of the testing apparatus after a landslide mass model is formed by filling soil mass in the box body;
FIG. 8 is a plan view of the tunnel model in a landslide mass.
The symbols in the drawings illustrate that: no. 1-9 are organic glass plates, 10 comprises supporting legs, 11-steel frames, 12-bottom plates, 13-side plates, 14- (for fixing the organic glass plates) bolts, 15- (on the organic glass plates 1) holes, 16- (for adjusting the upper and lower positions of the organic glass plates 1) bolt holes, 17-transverse supports, 18-fixing rings, 19-square steel pipes, 20-threaded steel bars, 21- (at two ends of the threaded steel bars) tightening nuts, 22-sprinkler pipes, 23- (sprinkler pipe) valves, 24-water supply pipes, 25-tunnel models, 26-strain gauges, 27-soil pressure boxes, 28-landslide body models and 29-dial indicators respectively.
Detailed Description
The invention is further illustrated by the following examples and figures.
Examples
The present embodiment is to use the present invention to study the interaction relationship between the landslide mass and the tunnel in a designed road tunnel.
For the tunnel, first, a model test apparatus shown in fig. 1 to 5 was fabricated in a geometric similarity ratio set to the tunnel and the landslide mass: the square box body is composed of a square steel frame 11 with supporting legs 10 at the lower part, a steel bottom plate 12 with two ends respectively fixedly arranged on the bottom frame, a left steel side plate 13 with an upper end respectively fixedly arranged on the left frame and a right frame and a left transparent organic glass plate with an upper end respectively fixedly arranged on the left frame and a right frame, and nine transparent organic glass plates with upper ends and lower ends respectively fixedly arranged on the front part and the rear part of the frame through bolts 14, wherein the nine organic glass plates are numbered respectively as 1, 2, 3, 4, 5, 6, 7, 8 and 9, the widths of the nine organic glass plates are respectively 30cm,30cm,20cm,20cm,20cm,20cm,20cm,20cm, and 30cm, the nine organic glass plates can move left and right after being disassembled through the bolts, and the arrangement positions of the nine organic glass plates at the front part and the nine organic glass plates at the rear part correspond to each other (the arrangement positions of the organic glass plates at the front part and the organic glass plates at the rear part are arranged one 1 corresponds to other organic glass plates); the height of an organic glass plate 1 in the nine organic glass plates is greater than that of the box body, a hole 15 simulating an inlet and an outlet of a tunnel is formed in the lower part of the organic glass plate, four transverse rows of bolt holes 16 and three vertical rows of bolt holes 16 are respectively formed in the upper end part and the lower end part of the organic glass plate, and the upper position and the lower position of the organic glass plate 1 can be adjusted by adjusting the bolt holes of the bolts fixedly connecting the organic glass plate 1 and the frame, so that the upper position; in order to improve the bearing capacity of the side wall of the box body, a fastening ring is additionally arranged in the transverse middle of the box body, the fastening ring consists of square steel pipes 19 positioned at the front part and the rear part of the steel frame and threaded steel bars 20 positioned at the two sides of the steel frame, two ends of each threaded steel bar respectively penetrate through the square steel pipes, the middle of each threaded steel bar penetrates through two fixing rings 18 on the transverse supports 17 at the two sides of the steel frame, and the square steel pipes clamp the front wall and the rear wall of the box body by screwing nuts 21 at the two ends; the top of the box body is open, nine sprinkling pipes 22 which are uniformly distributed at intervals are installed by utilizing a steel framework at the top of the box body, the sprinkling pipes are made of PVC plastic pipes, water spraying holes (not shown) are distributed along the axial lower surface of the sprinkling pipes, and the nine sprinkling pipes are respectively connected with a water supply pipe 24 through valves 23; there are four tunnel models 25 made of plaster, as shown in fig. 6, having the same hole pattern as the holes, respectively, 15mm wall thickness, and 10cm axial length.
Then, by using the model test device, the interaction relation between the landslide body and the tunnel is researched according to the following steps:
1) preparing a soil body material with a material similar ratio to that of a soil body of the slip mass according to the geological condition of the tunnel slip mass;
2) after the holes are sealed by using an adhesive tape, nine organic glass plates from No. 1 to No. 9 are respectively fixedly arranged on a front frame and a rear frame of the box body by using bolts according to the arrangement sequence shown in figure 1 to form the front wall and the rear wall of the box body, wherein the No. 1 organic glass plate with the holes is fixedly arranged by using the 2 nd row bolt holes on the upper part and the lower part of the No. 1 organic glass plate, so that the left, right, upper and lower positions of the holes are consistent with the set inlet and outlet positions;
3) with reference to fig. 7 and 8, filling the soil mass material prepared in step 1) in the box of the testing apparatus, and making a landslide mass model 28 as shown in fig. 7 according to a set geometric similarity ratio; simultaneously, a tunnel model (shown in figure 8) which is coaxial with the tunnel and is mutually spaced by 20cm is pre-embedded in the landslide body model, strain gauges 26 are respectively and correspondingly arranged at the upper part, the lower part, the left part and the right part (shown in figure 6) of the tunnel model, an earth pressure cell 27 (shown in figure 8) is arranged at the upper part, the strain of the tunnel model is monitored by the strain gauges, and the earth stress of the tunnel model is monitored by the earth pressure cell; a dial indicator 29 is arranged above the soil body of the landslide body and used for monitoring the displacement of the landslide body;
4) dismantling the adhesive tape, simulating the construction condition of the tunnel in dry season or rainy season by closing or opening a valve of a sprinkler pipe according to the test requirement, then excavating the soil body through a hole, researching the interaction relation between the landslide body and the tunnel under the terrain and geological conditions in different seasons (dry season or rainy season) by collecting landslide body displacement data monitored by a dial indicator above the landslide body soil body and strain and soil body stress data of the tunnel model monitored by a strain gauge and a soil pressure box on the outer surface of the tunnel model, and providing scientific basis for tunnel design and construction;
5) the positions of the holes are changed by moving the mutual positions of the organic glass plates on the front wall and the rear wall of the box body, so that different excavation positions of the tunnel are simulated; and (5) repeating the operations in the steps (1) to (4), researching the interaction relation of the landslide body under the terrain and geological conditions between different excavation positions of the tunnel and the tunnel, and providing scientific basis for tunnel design and construction.
Claims (2)
1. A model test device for researching interaction relation between a landslide body and a tunnel is characterized by comprising a square box body, wherein the front wall and the rear wall of the box body are formed by a group of transparent organic glass plates (1-9) which correspond to each other and can move left and right and are different in width, a hole (15) for simulating an inlet and an outlet of the tunnel is formed in the lower part of one organic glass plate (1), and the upper position and the lower position of the hole are adjustable relative to the side wall of the box body; a group of sprinkling pipes (22) which are uniformly distributed at intervals and can control water inlet through a valve (23) are arranged at the top of the box body; and the other group of tunnel models (25) are provided with holes which have the same shape as the holes, the wall thickness of 15mm and the axial length of 10 cm.
2. The method for studying the interaction relationship between a landslide body and a tunnel using the model test apparatus for studying the interaction relationship between a landslide body and a tunnel of claim 1, comprising the steps of:
1) preparing a soil body material with a material similarity ratio to the landslide body soil body according to the geological condition of a specific engineering site and the similar principle of geotechnical tests;
2) after the holes are sealed by using an adhesive tape, the organic glass plates forming the front wall and the rear wall of the box body are installed, and the positions of the holes are matched with the set positions of the inlet and the outlet of the tunnel by adjusting the mutual positions of the organic glass plates and the upper and lower positions of the holes;
3) according to the terrain condition of a specific engineering site, filling the soil body material prepared in the step 1) in the device, and making a landslide body model (28) according to a set geometric similarity ratio; a tunnel model which is coaxial with the tunnel and is spaced by 20cm is pre-buried in the landslide body model, strain gauges (26) are respectively arranged on the upper parts of two opposite sides of the outer surface of the tunnel model, and soil pressure boxes (27) are arranged on the top of the tunnel model and are respectively used for monitoring the strain of the tunnel model and the soil stress; arranging a dial indicator (28) above the landslide body soil body in the step (3) for monitoring the displacement of the landslide body;
4) removing the adhesive tape, simulating dry construction or rainy construction of the tunnel by closing or opening a valve of a sprinkler pipe according to the weather precipitation condition of an engineering construction site, excavating the soil body through a hole, collecting the displacement of the landslide body monitored by a dial indicator above the landslide body soil body and the strain and soil body stress of the tunnel model monitored by a strain gauge on the outer surface of the tunnel model, researching the interaction relation between the landslide body and the tunnel under the terrain and geological conditions in construction in different seasons, and providing scientific basis for tunnel design and construction;
5) the left and right positions of the holes are changed by moving the mutual positions of the organic glass plates on the front wall and the rear wall of the box body, so that different excavation positions of the tunnel are simulated; and (4) repeating the operations of the steps 1) to 4), researching the interaction relation between the landslide body under the terrain and geological conditions and the tunnel at different excavation positions of the tunnel, and providing scientific basis for the design and construction of the tunnel.
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| CN202010312647.3A CN111415566A (en) | 2020-04-20 | 2020-04-20 | Model test device and method for researching interaction relation between landslide body and tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533048A (en) * | 2021-07-16 | 2021-10-22 | 华东交通大学 | Tunnel model test device and method capable of changing tunnel burial depth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533048A (en) * | 2021-07-16 | 2021-10-22 | 华东交通大学 | Tunnel model test device and method capable of changing tunnel burial depth |
| CN113533048B (en) * | 2021-07-16 | 2022-10-14 | 华东交通大学 | Tunnel model test device and method capable of changing tunnel burial depth |
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