CN211292345U - Device for simulating influence of shield tunnel construction on existing tunnel - Google Patents
Device for simulating influence of shield tunnel construction on existing tunnel Download PDFInfo
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- CN211292345U CN211292345U CN201922125135.1U CN201922125135U CN211292345U CN 211292345 U CN211292345 U CN 211292345U CN 201922125135 U CN201922125135 U CN 201922125135U CN 211292345 U CN211292345 U CN 211292345U
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Abstract
The utility model discloses a device for simulating the influence of shield tunnel construction on an existing tunnel, wherein the existing model tunnel and a newly-built model tunnel are positioned at different layer positions of a model box, a steel sleeve is arranged on the newly-built model tunnel, the diameter of the steel sleeve is larger than that of the newly-built model tunnel, two ends of the model box corresponding to the steel sleeve are respectively provided with a pushing device and a drawing device, and the pushing device and the drawing device are respectively movably connected with two ends of the steel sleeve; and a monitoring element is fixedly arranged on the model tunnel and is electrically connected with the data acquisition instrument. The different relative positions and different stratums of the newly-built tunnel and the existing tunnel are simulated through the model box, the dynamic construction process of the newly-built model tunnel is controlled through the steel sleeve, the pushing equipment and the drawing equipment, and weights are placed on the model soil to simulate different local loads. The monitoring element collects data of deformation, segment internal force, soil pressure, annular seam opening amount and the like of the model tunnel, and further reflects deformation and mechanical characteristics of the existing tunnel and the newly built tunnel.
Description
Technical Field
The utility model relates to a tunnel structure model technical field, concretely relates to simulation shield tunnel construction is to device of existing tunnel influence.
Background
With the increasingly dense distribution of urban subway networks, the problem of line crossing will inevitably occur, and the phenomenon that a newly-built shield tunnel passes through an existing shield tunnel is common day by day. The tunnel crossing existing tunnel construction has the characteristics of small space, large construction difficulty, large interaction, large construction risk and the like. The shield construction inevitably disturbs the surrounding soil body, so that a stress field and a displacement field are redistributed to cause the deformation and additional stress of the existing subway tunnel, and the newly built tunnel has very strict requirements on the deformation control of the existing tunnel and the surrounding rock. The new tunnel needs to ensure the safety of the new tunnel and the operation safety of the existing shield tunnel when the new tunnel passes through the existing shield tunnel, and the new tunnel becomes an important problem to be solved urgently in the tunnel passing engineering.
A large number of shield tunnels operated generate excessive settlement or uneven deformation due to multiple reasons, so that seepage and mud leakage, local structural falling and damage or longitudinal bending deformation of an internal structure are induced, and the structural safety of the tunnel, the operation safety of trains and the comfort degree are influenced to a certain extent. And if the overlarge pipe piece is deformed, the height difference of the longitudinal track is easily overlarge, the flatness of the track is also enabled to exceed the standard, and the abrasion of the wheel is aggravated. Construction disturbance, formation unevenness and the like are main factors causing the deformation of the tunnel to be overlarge. The test research of the shield tunnel segment structure mainly takes a prototype test and a similar model test as main points. The prototype test is the most direct and effective test means, and can truly reflect the stress deformation condition of the pipe piece; however, the prototype test has a large scale and high cost, and requires large-scale equipment to be loaded, so that the application range of the prototype test is limited. The model test is based on a similar theory, can simulate various relatively complex boundary conditions, and can comprehensively and vividly present stress, deformation mechanism, failure mechanism and the like under the combined action of an engineering structure and related rock-soil bodies. For a long time, a model test method is an important means for researching and solving the problem of large complex geotechnical and structural engineering. The method is a complex system engineering and solves the problems of selection of a shield tunnel test scheme on a design theoretical basis, selection of a tunnel segment structure, preparation of a model soil material, determination of a loading scheme and a simulation condition, simplification of boundary conditions and the like.
In a traditional shield model test, the stratum is usually simplified, most model tunnels are arranged in the same model soil medium, and the influence of different stratums on shield construction is not considered; and most model tests only consider one situation, and rarely consider simulating different relative positions of two tunnels. Moreover, the dynamic simulation of the shield construction is considered less. Secondly, most shield tunnel models do not simulate the longitudinal joint, the circular joint and the splicing mode formed by the segments on the actual tunnel, the influence of the joint of the tunnel segments cannot be considered or is difficult to accurately simulate, and the test result of the longitudinal performance of the tunnel is inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technical problem, proposed following technical scheme:
in a first aspect, the embodiment of the utility model provides a device that simulation shield tunnel construction influences existing tunnel is provided, include: the device comprises a model box, a control module and a control module, wherein an existing model tunnel and a newly-built model tunnel are arranged in the model box and are positioned at different layer positions of the model box; a steel sleeve is arranged on the newly-built model tunnel, the diameter of the steel sleeve is larger than that of the newly-built model tunnel, a pushing device and a drawing device are respectively arranged at two ends of the model box corresponding to the steel sleeve, and the pushing device and the drawing device are respectively movably connected with two ends of the steel sleeve; and a monitoring element is fixedly arranged on the model tunnel and is electrically connected with the data acquisition instrument.
By adopting the implementation mode, the relative relation between two tunnels in different types is simulated by controlling the positions of the newly built tunnel and the existing tunnel in the model box, and the influence of the newly built tunnel in different soil layers on the existing tunnel can also be simulated by combining model soils in different types. The dynamic construction process of the newly-built model tunnel is controlled through the steel sleeve, the pushing equipment and the drawing equipment, and weights are placed on the model soil to simulate different local loads. And finally, acquiring data such as deformation of the model tunnel, segment internal force, soil pressure, annular seam opening amount and the like through a monitoring element, and further accurately reflecting the deformation and mechanical characteristics of the existing tunnel and the newly-built tunnel.
With reference to the first aspect, in a first possible implementation manner of the first aspect, a steel plate is fixedly arranged at a movable end of the ejector device, and an area of the steel plate is larger than a cross-sectional area of the steel sleeve. With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the mold box is a square box body with an open top, two side surfaces of the box body are made of transparent tempered glass, and a scale is arranged on the tempered glass on any side; one or more types of model soil are arranged in the model box, the existing model tunnel and the newly-built model tunnel are arranged in the model soil, and different types of model soil are respectively arranged at different positions of the model box along the model box. The graduated scale is arranged, so that the control of the position of the model tunnel and the thickness of soil clamped between the two tunnels can be realized, and the simulation of the tunnel penetrating through different stratums can be realized by various types of model soil.
With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the pushing device includes a first movable rack, the first movable rack is movably connected to one end of the mold box, a jack is disposed on the movable rack, and the steel plate is fixedly disposed at a telescopic end of the jack. The steel plate is fixedly connected with the telescopic single of the jack, and the steel sleeve can be driven into the model soil of the model box by controlling the jack. The first rack is movably connected with the model box through four threaded rods, the distance between the first rack and the model box can be determined, the jack is arranged on the rack, and the maximum depth distance of each excavation step is determined by the maximum stroke of the jack.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the drawing apparatus includes a second moving rack, the second moving rack is movably connected to one end of the model box, which is opposite to the first moving rack, and a winch is fixedly disposed on the second moving rack. The second stand is movably connected with the model box through four threaded rods, and the distance between the second stand and the model box can be determined.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the model tunnel includes a model lining ring and model bolts, the model lining ring includes a capping segment, an adjoining segment and a standard segment, and the segments are fixedly connected with each other through the model bolts. The model lining ring is 200mm in diameter, and length 40 mm's a plurality of ring form short polyethylene pipe is constituteed, and the model lining ring includes that one seals a section of jurisdiction, two adjoin section of jurisdiction and three standard section of jurisdiction and totally six model section of jurisdiction are constituteed, the model bolt is diameter phi 3mm, and length l 16 mm's nylon 66 screw, and the hand hole that four terminal surfaces of every section of jurisdiction central authorities respectively bore a 3mm is connected with section of jurisdiction all around through the model bolt, hoop, vertically respectively through 6 the model bolt will be different the model section of jurisdiction is connected.
With reference to the fourth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, one end of the steel sleeve corresponding to the drawing device is a knife edge structure, a pulling hole is formed in each 1/4 round position, and the steel sleeve is movably connected with the pulling hook of the winch through the pulling hole. Punching is carried out at every 1/4 round positions of an entry end of a steel sleeve, the steel sleeve is used for being connected with a winch drag hook in a later period, the steel sleeve is loaded by a jack and enters preset position model soil, muck in the steel sleeve is cleaned after the steel sleeve is communicated, a segment model of a newly-built model tunnel is placed in the steel sleeve, then the steel sleeve is pulled out by the winch, and the newly-built tunnel is kept in the model soil, namely shield construction is simulated.
With reference to the first aspect, in a seventh possible implementation manner of the first aspect, the monitoring elements are disposed at the arch top, the arch bottom and the arch waist of the model tunnel, and the monitoring elements are fixedly connected to the segments constituting the model tunnel. The monitoring elements are arranged at a plurality of positions of the model tunnel, so that the accuracy of monitoring data is improved.
In a second aspect, an embodiment of the present invention provides a method for using a device for simulating the influence of shield tunnel construction on an existing tunnel, where the device is implemented in a first aspect or any one of possible implementation manners of the first aspect, and the method includes: arranging an existing model tunnel and model soil in a model box, so that the existing model tunnel is buried in the model soil; arranging a steel sleeve in the model soil through ejection equipment, and enabling the steel sleeve and the existing model tunnel to be located on different layers; cleaning the model soil in the steel sleeve, and setting a new model tunnel in the steel sleeve; after the new model tunnel is set, pulling out the steel sleeve through drawing equipment; paving a wood board on the top of the model soil, and placing weights with different weights on the wood board for simulating local load; the monitoring element collects data and sends the collected data to the data collector; and after the data acquisition is finished, adjusting the relative positions of the newly-built tunnel and the existing tunnel, simulating different relative relations of the two tunnels, and rereading the test steps.
Drawings
Fig. 1 is a schematic structural diagram of a device for simulating the influence of shield tunnel construction on an existing tunnel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mold box according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a model box for placing model soil according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a model tunnel according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for using a device for simulating the influence of shield tunnel construction on an existing tunnel according to an embodiment of the present invention;
in fig. 1 to 5, the symbols are represented as:
1-model box, 2-existing model tunnel, 3-newly-built model tunnel, 4-steel sleeve, 5-pushing device, 6-drawing device, 7-model soil, 8-graduated scale, 9-angle steel, 10-square tube steel, 11-steel plate, 12-first moving rack, 13-jack, 14-threaded rod, 15-second moving rack, 16-winch, 17-model bolt, 18-capping segment, 19-adjacent segment, 20-standard segment, 21-monitoring element.
Detailed Description
The present invention will be described with reference to the accompanying drawings and embodiments.
The geometric similarity ratio, the strength, the stress, the cohesive force and the elastic modulus similarity ratio of the testing device provided by the embodiment of the utility model to an actual tunnel prototype are all 1:30, and the volume-weight similarity ratio, the Poisson ratio, the strain and the friction angle similarity ratio are all 1: 1. The method can better simulate various working conditions of the construction of a newly-built shield tunnel under different stratums or composite stratums, different relative position relations with the existing shield tunnel, surface local load and the like, influences on the structural deformation and mechanical characteristics of the shield tunnel model, and provides reliable data support for actual tunnel engineering.
Fig. 1 is the embodiment of the utility model provides a do the embodiment of the utility model provides a structural schematic diagram of a device that simulation shield tunnel construction influences existing tunnel, see fig. 1, the device includes: the model box comprises a model box 1, wherein an existing model tunnel 2 and a new model tunnel 3 are arranged in the model box 1, and the existing model tunnel 2 and the new model tunnel 3 are located at different layer positions of the model box 1. A steel sleeve 4 is arranged on the newly-built model tunnel 3, the diameter of the steel sleeve 4 is larger than that of the newly-built model tunnel 3, a pushing device 5 and a drawing device 6 are respectively arranged at two ends of the model box 1 corresponding to the steel sleeve 4, and the pushing device 5 and the drawing device 6 are respectively movably connected with two ends of the steel sleeve 4; and a monitoring element is fixedly arranged on the model tunnel and is electrically connected with the data acquisition instrument.
Referring to fig. 2, the model box 1 is a square box with an open top, two sides of the box are made of transparent tempered glass, and a graduated scale is arranged on the tempered glass on any side. The model box 1 is internally provided with various types of model soil 7, the existing model tunnel 2 and the newly-built model tunnel 3 are arranged in the model soil 7, and the model soils 7 of different types are respectively arranged at different positions of the existing model tunnel 2 and the newly-built model tunnel 3 along the model box 1. The arrangement of the graduated scale can realize the control of the positions of the existing model tunnel 2 and the newly-built model tunnel 3 in the model box 1, and referring to fig. 3, different types or types of model soil 7 realize the simulation of different stratums or various composite stratums.
The model box 1 comprises a box body frame, the box body frame is composed of angle steel 9 and square tube steel 10, the model box 1 is provided with waterproof bamboo plywood except the other two side surfaces and the bottom surface of the toughened glass, and the joints of the toughened glass and the waterproof bamboo plywood and the box body frame are provided with filling glass cement.
In one exemplary embodiment, the mold box 1 has a length and width of 2 meters and a height of 1.5 meters. The side surface of the box body frame comprises 5 transverse square tube steels 10 and 7 longitudinal square tube steels 10, the distance between the transverse square tube steels 10 is 500-550mm, and the distance between the longitudinal square tube steels 10 is 300-310 mm. The angle steel 9 is welded at a position 300mm away from the upper bottom surface and the lower bottom surface of the model box 11 of the vertical square tube steel 10, and the angle steel 9 is used for connecting square tube steel 1021 longitudinally arranged on the side surface of the box body frame together.
Further referring to fig. 1, a steel plate 11 is fixedly arranged at the movable end of the ejector 5, and the area of the steel plate 11 is larger than the cross-sectional area of the steel sleeve 4. This allows the insertion of the steel sleeve into the mold box 1 by manipulating the steel plate 11.
The ejection device 5 comprises a first movable rack 12, the first movable rack is movably connected with one end of the model box 1, a jack 13 is arranged on the movable rack, and the steel plate 11 is fixedly arranged at the telescopic end of the jack 13. The steel plate 11 is fixedly connected with the telescopic unit of the jack 13, and the steel sleeve can be driven into the model soil 7 of the model box 1 by controlling the jack 13. The first platform is movably connected with the model box 1 through four threaded rods 14, so that the distance between the first platform and the model box 1 can be determined, the jack 13 is arranged on the platform, and the maximum travel of the jack 13 determines the maximum depth distance of each excavation step.
The drawing device 6 comprises a second moving rack 15, wherein the second moving rack 15 is movably connected with one end of the model box 1, which is opposite to the first moving rack 12, and a winch 16 is fixedly arranged on the second rack. The second gantry is movably connected to the model box 1 by four threaded rods 14, enabling the distance between the two to be determined.
Furthermore, one end of the steel sleeve 4, which corresponds to the drawing device 6, is of a knife edge structure, a drawing hole is formed in each 1/4 round position, and the steel sleeve 4 is movably connected with the draw hook of the winch 16 through the drawing hole. Punching is carried out at every 1/4 round positions of the entry end of the steel sleeve 4 for later-stage drag hook connection with a winch 16, the steel sleeve 4 is loaded by a jack 13 to enter preset position model soil 7, muck in the steel sleeve 4 is cleared after the steel sleeve 4 is communicated, a segment model of a newly-built model tunnel 3 is placed in the steel sleeve 4, then the steel sleeve 4 is pulled out by the winch 16, and the newly-built segment is kept in the model soil 7, namely shield construction is simulated.
According to the similar ratio of the existing model tunnel 2 and the newly-built model tunnel 3, a polyethylene pipe with the outer diameter of 200mm and the thickness of 10mm is selected as a tunnel similar material, and nylon 66 is selected as a bolt similar material. Referring to fig. 4, the model tunnel includes a model lining ring including a capped segment 18, an adjoining segment 19 and a standard segment 20, and model bolts 17, and the segments are fixedly connected by the model bolts 17. The model lining ring is 200mm in diameter, and a plurality of ring form short polyethylene pipe of length 40mm constitute, and the model lining ring includes that one seals a section of jurisdiction 18, two are adjoined the section of jurisdiction 19 and three standard section of jurisdiction 20 and totally six model section of jurisdiction are constituteed, model bolt 17 is diameter phi 3mm, and length l 16 mm's nylon 66 screw, and the hand hole that four terminal surfaces of every section of jurisdiction central authorities respectively bore a 3mm is connected with the section of jurisdiction all around through model bolt 17, and hoop, vertical each through 6 model bolt 17 will be different the model section of jurisdiction is connected.
The monitoring element 21 is arranged at the positions of the arch crown, the arch bottom and the arch waist of the existing model tunnel 2 and the newly-built model tunnel 3, and the monitoring element 21 is fixedly connected with the pipe pieces forming the existing model tunnel 2 and the newly-built model tunnel 3. The monitoring element 21 respectively collects the deformation, segment internal force and soil pressure data of the model tunnel, and the data acquisition instrument transmits the data to an upper computer for processing to obtain the longitudinal deformation and mechanical properties of the tunnel. The monitoring elements 21 are arranged at a plurality of positions of the model tunnel, so that the accuracy of monitoring data is improved.
It can be known from the above embodiments that the present embodiment provides a device for simulating the influence of shield tunnel construction on an existing tunnel, which simulates different relative position relationships between two tunnels by controlling the positions of an existing model tunnel 2 and a newly-built model tunnel 3 in a model box 1; different strata are simulated by controlling different combinations of model soil 7 within the model box 1. The dynamic construction process of the newly-built model tunnel 3 is controlled through the steel sleeve 4, the ejection device 5 and the drawing device 6, and weights are placed on the model soil 7 to simulate different local loads. And finally, data such as deformation of the model tunnel, segment internal force, soil pressure, annular seam opening amount and the like are collected through a monitoring element 21, so that the deformation and mechanical characteristics of the existing tunnel and the newly built tunnel are accurately reflected.
The device that the simulation shield tunnel construction that provides is to existing tunnel influence with above-mentioned embodiment is corresponding, the utility model also provides a device application method embodiment that the simulation shield tunnel construction influences existing tunnel. Referring to fig. 5, the method includes:
s101, arranging an existing model tunnel and model soil in a model box, and enabling the existing model tunnel to be buried in the model soil.
In this embodiment, different types of model soils need to be combined, so as to simulate the influence of different strata or multiple composite strata on the construction of a newly-built shield tunnel on the existing shield tunnel.
S102, arranging a steel sleeve in the model soil through ejection equipment, and enabling the steel sleeve and the existing model tunnel to be located on different layers.
S103, cleaning the model soil in the steel sleeve, and arranging a new model tunnel in the steel sleeve.
And S104, after the new model tunnel is set, pulling out the steel sleeve through a pulling device.
S105, paving a wood board on the top of the model soil, and placing weights with different weights on the wood board for simulating local loads.
If the local load effect needs to be simulated according to the working condition, a wood plate is flatly laid on the top of the model soil, the weights are loaded on the wood plate, and the size of the local load is controlled by changing the number of the weights.
And S106, the monitoring element acquires data and sends the acquired data to the data acquisition instrument.
In the embodiment, the monitoring element acquires data such as deformation of the model tunnel, segment internal force, soil pressure and the like, and the data acquisition instrument transmits the acquired data to the upper computer, so that the deformation and mechanical properties of the tunnel are accurately reflected.
S107, after data acquisition is finished, adjusting the relative positions of the newly-built tunnel and the existing tunnel, simulating different relative relations between the two tunnels, and repeating the test steps.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and if it is replaced, the present invention is only combined with and described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides a device of simulation shield tunnel construction to existing tunnel influence which characterized in that includes: the device comprises a model box, a control module and a control module, wherein an existing model tunnel and a newly-built model tunnel are arranged in the model box and are positioned at different layer positions of the model box; a steel sleeve is arranged on the newly-built model tunnel, the diameter of the steel sleeve is larger than that of the newly-built model tunnel, a pushing device and a drawing device are respectively arranged at two ends of the model box corresponding to the steel sleeve, and the pushing device and the drawing device are respectively movably connected with two ends of the steel sleeve; and a monitoring element is fixedly arranged on the model tunnel and is electrically connected with the data acquisition instrument.
2. The device for simulating the influence of shield tunnel construction on the existing tunnel according to claim 1, wherein a steel plate is fixedly arranged at the movable end of the pushing equipment, and the area of the steel plate is larger than the cross-sectional area of the steel sleeve.
3. The device for simulating the influence of shield tunnel construction on the existing tunnel according to claim 2, wherein the model box is a square box body with an open top, two side surfaces of the box body are made of transparent toughened glass, and a graduated scale is arranged on the toughened glass on any side; one or more types of model soil are arranged in the model box, the existing model tunnel and the newly-built model tunnel are arranged in the model soil, and different types of model soil are respectively arranged at different positions of the existing model tunnel and the newly-built model tunnel along the model box.
4. The apparatus of claim 2, wherein the jacking device comprises a first movable platform, the first movable platform is movably connected to one end of the mold box, a jack is arranged on the movable platform, and the steel plate is fixedly arranged at a telescopic end of the jack.
5. The apparatus of claim 4, wherein the drawing device comprises a second movable gantry movably connected to one end of the mold box opposite to the first movable gantry, and a winch is fixedly disposed on the second movable gantry.
6. The apparatus of claim 1, wherein the model tunnel comprises a model lining ring and a model bolt, the model lining ring comprises a capping segment, an adjacent segment and a standard segment, and the segments are fixedly connected by the model bolt.
7. The device for simulating the influence of shield tunnel construction on the existing tunnel according to claim 5, wherein one end of the steel sleeve corresponding to the drawing equipment is of a knife edge structure, a drawing hole is formed in each 1/4 round position, and the steel sleeve is movably connected with a drawing hook of the winch through the drawing hole.
8. The apparatus of claim 1, wherein the monitoring elements are disposed at the arch crown, arch bottom and arch waist positions of the model tunnel, and the monitoring elements are fixedly connected to the segments constituting the model tunnel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922125135.1U CN211292345U (en) | 2019-12-02 | 2019-12-02 | Device for simulating influence of shield tunnel construction on existing tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922125135.1U CN211292345U (en) | 2019-12-02 | 2019-12-02 | Device for simulating influence of shield tunnel construction on existing tunnel |
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| CN211292345U true CN211292345U (en) | 2020-08-18 |
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