CN109356209B - Coiled plate type foundation pit excavation simulation device under hypergravity environment - Google Patents
Coiled plate type foundation pit excavation simulation device under hypergravity environment Download PDFInfo
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- CN109356209B CN109356209B CN201811519796.6A CN201811519796A CN109356209B CN 109356209 B CN109356209 B CN 109356209B CN 201811519796 A CN201811519796 A CN 201811519796A CN 109356209 B CN109356209 B CN 109356209B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention provides a coiled plate type foundation pit excavation simulation device in a hypergravity environment, which comprises a model box body and a coiled plate type simulation structure, wherein the model box body is a rectangular box body with an opening at the upper end, the coiled plate type simulation structure is arranged in the model box body and divides the model box body into a left part and a right part, soil bodies are placed at the left part of the model box body, the coiled plate type simulation structure comprises a coiled plate supporting plate and a gate supporting plate which are arranged in parallel, and a movable gate positioned between the two, a plurality of rotatable coiled plate structures are arranged on the coiled plate supporting plate, the movable gate can be driven by a steel wire rope guiding mechanism to ascend and descend, the coiled plate structures positioned at the left side of the movable gate sequentially rotate rightwards along with the downward movement of the movable gate, and the soil bodies fall into the right side of the model box body through gaps generated after the rotation of the coiled plate structures. The invention can meet the foundation pit excavation requirements under different working conditions, especially the foundation pit excavation test simulation requirements under the hypergravity environment.
Description
Technical Field
The invention belongs to the field of supergravity centrifugal model test devices, and particularly relates to a coiled plate type foundation pit excavation simulation device in a supergravity environment.
Background
In the deep foundation pit earthwork excavation construction process, space-time effect needs to be fully considered, earthwork is excavated in a layered, partitioned, symmetrical and balanced mode, so that the stress and strength of soil are prevented from being rapidly reduced, the foundation pit side slope is locally damaged or is integrally instable and slipped, and the supporting structure is inclined and sunk to collapse. In the geotechnical model test process, how to accurately simulate the layered excavation process becomes an important link affecting the excavation test result of the foundation pit.
The traditional foundation pit excavation simulation method can be classified into a grab bucket method, a gravity drainage method and a sand bag method, but has respective problems and limitations, and the method is specifically described as follows:
(1) Grab bucket method. The grab bucket is similar to the grab bucket of the port claw machine in shape, and has the following defects: (1) due to the limitation of the structural form of the mechanical grab bucket, the bottom excavation surface is uneven; (2) the stress distribution of the whole excavation surface is uneven due to the sequence of excavation areas in time and space; (3) the excavation depth is difficult to accurately control, and the construction state of thin layer excavation is difficult to simulate; (4) the whole excavation process is long in time consumption and low in test efficiency.
(2) And (5) a heavy liquid discharge method. The gravity drainage method generally needs to excavate a foundation pit in advance on the surface of a soil body model according to a designed size, manufacture a flexible silica gel box, put the flexible silica gel box into the foundation pit, connect a silica gel bag outside the model box by using a liquid drainage pipeline, and test simulation of excavation of the foundation pit by a method of draining the gravity in the silica gel bag. There are many ways to do thisDisadvantages: (1) the heavy liquid is ZnCl 2 The liquid has toxicity and great damage to human health; (2) the method is only applicable to special model soil, such as clay with certain strength; (3) the liquid discharge pipeline penetrates through the soil body model, so that the influence on the soil body strength is large; (4) additional valves are needed to control the on-off of the pipeline, and risks of incapability of opening possibly exist in the test, so that the success rate of the test is reduced.
(3) Sand bag method. The sand bag method is similar to the gravity drainage method, the foundation pit is required to be excavated in advance, sand bags with hard shells are manufactured and placed in the foundation pit, and the sand bags are hung one by one in a test to realize layered excavation of the foundation pit. The disadvantages of this approach are: (1) only suitable for special model soil, such as clay with certain strength; (2) the depth of excavation is fixed, and great, can't realize the excavation of developments or less degree of depth.
In summary, in the field of geotechnical centrifugal model test, there is an urgent need to develop a foundation pit excavation simulation device which can flexibly adjust excavation depth, adapt to various soil properties, conform to the actual situation of the site, and is simple and reliable.
Disclosure of Invention
In view of the above, the invention aims to provide a coiled plate type foundation pit excavation simulation device under a hypergravity environment, which is used for flexibly adjusting the depth of each layer during foundation pit excavation by controlling the height of a movable gate according to the test requirement of foundation pit excavation simulation under the hypergravity environment; under a limited working space, the large-stroke opening of the gate is realized in a pulley block traction mode, so that the foundation pit excavation with larger depth can be simulated; the rolling plate structure can overcome deformation caused by huge soil pressure in a supergravity environment, can flexibly realize the overturning of the rolling plate structure, and meets foundation pit excavation requirements under different working conditions, especially foundation pit excavation test simulation requirements under the supergravity environment.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the utility model provides a roll up formula foundation ditch excavation analogue means under supergravity environment, including model box and roll up board formula analog architecture, the model box is upper end open-ended rectangle box, roll up board formula analog architecture and set up in the model box, and cut apart into left and right sides two parts with the model box, the soil body is placed to model box left part, roll up board formula analog architecture including parallel arrangement and gate backup pad and lie in movable gate between the two, be provided with a plurality of rotatable board structures of rolling up in the board backup pad, movable gate can rise and descend under wire rope guiding mechanism's drive, along with movable gate downwardly moving, be located the board structure of rolling up on its left and rotate right in proper order, the soil body drops into the model box right side through the gap that produces after the board structure rotation. The height of each layer of foundation pit excavation can be flexibly adjusted by controlling the height of the movable gate.
Further, wire rope guiding mechanism sets up in the model box right side, wire rope guiding mechanism includes wire rope and assembly pulley, and the assembly pulley includes assembly pulley and lower assembly pulley, and the assembly pulley passes through the assembly pulley backup pad setting in the model box upper end, and lower assembly pulley sets up in the bottom of model box, and the upper end of movable gate is connected to wire rope's one end, then wears out the model box after passing through assembly pulley, lower assembly pulley, links to each other with gate mobile device, and gate mobile device pulling wire rope realizes the reciprocating of movable gate. Under the limited working space, the large-stroke opening of the movable gate is realized in a pulley block traction mode, so that the foundation pit excavation with larger depth can be simulated; the rolling plate structure can overcome deformation caused by huge soil pressure in a hypergravity environment and flexibly realize the overturning of the rolling plate structure.
Further, the model box includes front bezel, left side board, right side board, backplate and bottom plate, and the front bezel opening, and the opening part is provided with the organic glass window, and the periphery of organic glass window is fixed on the front bezel through the organic glass apron, has seted up sand outlet and wire rope export on the front bezel that is located the model box right side, and the detachable displacement sensor that is provided with in model box left side top.
Further, a coil mounting opening is formed in the coil support plate, the coil structure is arranged in the coil mounting opening, two ends of the coil movable unit rotating shaft penetrate through the coil structure and then are arranged on two sides of the coil mounting opening, and the coil structure is rotationally connected with the coil support plate through the coil movable unit rotating shaft.
Further, the upper end of the coiled plate structure is provided with a mounting hole through which a coiled plate movable unit rotating shaft can pass, and the coiled plate movable unit rotating shaft can rotate after passing through the mounting hole. After the test starts, the movable gate moves downwards, and the right side of the coiled plate structure loses support, so that the coiled plate structure rotates to the right side, and soil on the left side after the coiled plate structure rotates falls on the right side of the model box body.
Further, still include gate mobile device, gate mobile device includes braced frame, servo motor, ball, guiding axle and wire rope drag the connecting plate, and servo motor sets up outside braced frame, and ball, guiding axle and wire rope drag the connecting plate setting in braced frame, ball and guiding axle are parallel to each other and all pass wire rope drag the connecting plate, are connected through linear bearing between guiding axle and the wire rope drag the connecting plate, and servo motor links to each other with ball, is provided with the wire rope connecting piece of being connected with wire rope on the wire rope drag the connecting plate.
Further, the sand box is a box body with an opening at the upper end, the sand box is tightly attached to the model box body, the soil body on the right side of the model box body enters the sand box body after passing through the sand outlet of the front plate of the model box body and the connecting port arranged on the rear plate of the sand box body, and the sizes of the connecting port and the sand outlet are the same. The sand outlet and the connecting port are both right-angled quadrangles.
Further, the bottom supporting plate of the sand filling box is covered on the lower pulley block, and the bottom supporting plate of the sand filling box enables the lower pulley block to avoid contact with soil dropping on the right side of the model box.
Further, a steel wire rope sleeve is arranged between the pulley block support plate and the sand box bottom support plate, and a steel wire rope passes through the pulley block support plate after passing through the upper pulley block, enters the steel wire rope sleeve, then passes through the sand box bottom support plate, and is connected with the gate moving device after passing through the lower pulley block.
Further, the heights of the sand outlet and the connecting port are h, the sum of the thickness of the front plate where the sand outlet is positioned and the thickness of the rear plate of the sand storage box where the connecting port is positioned is D, and the requirement that h/D is larger than the tangent value of the soil repose angle is met.
Further, the area where the gate support plate is located and the movable gate moves is an opening, namely, soil on the left side of the model box body falls on the right side of the model box body through the gate support plate after passing through the rolling plate structure.
Further, two steel wire rope connectors are symmetrically arranged at the upper end of the movable gate, a plurality of gate lightening holes are formed in the movable gate, and movable friction plates are arranged on two sides of the movable gate.
Further, the upper pulley block and the lower pulley block are respectively provided with two groups, and the end parts of the steel wire ropes are connected with the two ends of the movable gate.
The two sides of the upper end opening of the model box body are provided with T-shaped guide rails, the displacement sensor above the left side of the model box body is fixed through the displacement sensor mounting bracket, and the displacement sensor mounting bracket is fixedly arranged on the T-shaped guide rails through bolts, so that the measuring position of the displacement sensor can be flexibly adjusted during a test.
The servo motor is provided with a right-angle speed reducer, and the right-angle speed reducer is connected with the ball screw through a coupler.
The working principle of the invention is as follows:
the device is placed on a geotechnical centrifuge work hanging basket platform, a model foundation soil body is filled in a cavity at the left side of a model box body, in order to ensure that a coiled plate structure of the model box body turns over smoothly, a first layer of coiled plate structure is turned over rightwards before a test starts, the top of a movable gate supports the first layer of coiled plate structure after turning over, and the first layer of coiled plate structure is kept vertical to the movable gate (coiled plate supporting plate); the steel wire rope is driven by the servo motor to drag the connecting plate to move towards the front plate direction of the model box body, the steel wire rope drives the movable gate to move downwards to the position of the second coiled plate structure through the steel wire rope guide mechanism, the second coiled plate structure is smoothly folded under the action of centrifugal force, and the second coiled plate structure is matched with a mechanical arm scraping plate of the centrifugal machine to excavate the model foundation for the first time; the settlement condition of the foundation soil outside the foundation pit can be monitored by a displacement sensor erected on the T-shaped guide rail when the foundation pit is excavated for the first time; repeating the above actions, and excavating deeper soil layers.
A part of the model soil excavated by the foundation pit is accommodated in a cavity formed by a bottom supporting plate of the sand filling box, a side plate of the model box, a front plate of the model box, a back plate of the model box and a gate supporting plate, and the other part of the model soil flows into the sand storage box from a sand outlet.
In the supergravity geotechnical centrifuge, the working space is limited, the movable gate is required to be connected with one end of a steel wire rope in the width direction of a model box body in the length direction of a movable gate dragging device, the steel wire rope of a gate moving device is connected with the other end of the steel wire rope to drag a connecting plate, and the dragging force is reversed through a pulley arranged on a pulley block supporting plate and a pulley arranged on a sand box bottom supporting plate.
The gate dragging device is driven by a servo motor, the servo motor drives the ball screw transmission structure to rotate after right-angle speed reduction and speed reduction, the ball screw structure converts the rotation into linear motion, and the steel wire rope is driven to drag the connecting plate to horizontally move along the guide shaft.
Compared with the prior art, the coiled plate type foundation pit excavation simulation device under the hypergravity environment has the following advantages:
according to the coiled plate type foundation pit excavation simulation device under the hypergravity environment, the height of each layer during foundation pit excavation can be flexibly adjusted by controlling the height of the movable gate; under a limited working space, the large-stroke opening of the gate is realized in a pulley block traction mode, so that the foundation pit excavation with larger depth can be simulated; the rolling plate structure can overcome deformation caused by huge soil pressure in a hypergravity environment and flexibly realize the overturning of the rolling plate structure; the T-shaped guide rail structure positioned at the top of the model box body can be used for flexibly adjusting the measuring position of the displacement sensor in the test, and the device has perfect functions, is convenient to install, is safe and reliable, and can meet the requirement of foundation pit excavation simulation in a hypergravity environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of an overall three-dimensional structure of a coiled plate type foundation pit excavation simulation device under a hypergravity environment according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of the front plate of FIG. 1;
FIG. 3 is a schematic perspective view of the flask of FIG. 2 with the reservoir removed;
fig. 4 is a schematic perspective view of a model box according to an embodiment of the present invention;
fig. 5 is a schematic perspective view of a wire rope guiding mechanism according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a coiled plate type simulation structure according to an embodiment of the present invention;
fig. 7 is a schematic perspective view of a coiled plate type simulation structure according to an embodiment of the present invention;
FIG. 8 is a schematic perspective view of a movable gate according to an embodiment of the present invention;
FIG. 9 is a schematic perspective view of a gate moving device according to an embodiment of the present invention;
fig. 10 is a schematic perspective view of a coiled plate structure according to an embodiment of the present invention;
FIG. 11 is a schematic perspective view of a structure of connection of a plurality of coiled plates according to an embodiment of the present invention;
fig. 12 is a schematic perspective view of a T-shaped guide rail according to an embodiment of the present invention.
Reference numerals illustrate:
1-a model box; 101-a front plate; 102-left side plate; 103-right side plate; 104-a back plate; 105-a bottom plate; 106-an organic glass window; 107-plexiglass cover plate; 108-a sand outlet; 109-wire rope outlet; 2-a coiled plate type simulation structure; 201-a coiled plate supporting plate; 202-a gate support plate; 203-a movable gate; 204-a coiled plate structure; 205-a rolling plate moving unit rotating shaft; 3-a wire rope guiding mechanism; 301-a steel wire rope; 302-upper pulley block; 303-lower pulley block; 304-pulley block supporting plates; 305-a flask bottom support plate; 306-a wire rope sleeve; 4-a gate moving device; 401-a support frame; 402-a servo motor; 403-ball screw; 404-guiding shaft; 405-dragging a connecting plate by a steel wire rope; 406-linear bearings; 5-sand storage box.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-12, a coiled plate type foundation pit excavation simulation device under a hypergravity environment comprises a model box body 1 and a coiled plate type simulation structure 2, wherein the model box body 1 is a rectangular box body with an opening at the upper end, the coiled plate type simulation structure 2 is arranged in the model box body 1 and divides the model box body 1 into a left part and a right part, soil bodies are placed at the left part of the model box body 1, the coiled plate type simulation structure 2 comprises a coiled plate supporting plate 201 and a gate supporting plate 202 which are arranged in parallel, a movable gate 203 is arranged between the two, a plurality of rotatable coiled plate structures 204 are arranged on the coiled plate supporting plate 201, the movable gate 203 can ascend and descend under the driving of a steel wire rope guiding mechanism 3, the coiled plate structures 204 positioned at the left side of the movable gate 203 sequentially rotate rightwards along with the downward movement of the movable gate 203, and gaps generated after the soil bodies rotate through the coiled plate structures 204 fall into the right side of the model box body 1.
The steel wire rope guiding mechanism 3 is arranged in the right side of the model box body 1, the steel wire rope guiding mechanism 3 comprises a steel wire rope 301 and a pulley block, the pulley block comprises an upper pulley block 302 and a lower pulley block 303, the upper pulley block 302 is arranged at the upper end of the model box body 1 through a pulley block supporting plate 304, the lower pulley block 303 is arranged at the bottom of the model box body 1, one end of the steel wire rope 301 is connected with the upper end of the movable gate 203, then the steel wire rope penetrates out of the model box body 1 after passing through the upper pulley block 302 and the lower pulley block 303, the steel wire rope is connected with the gate moving device 4, and the gate moving device 4 pulls the steel wire rope 301 to realize up-down movement of the movable gate 203.
The model box 1 comprises a front plate 101, a left side plate 102, a right side plate 103, a back plate 104 and a bottom plate 105, wherein the front plate 101 is provided with an opening, an organic glass window 106 is arranged at the opening, the periphery of the organic glass window 106 is fixed on the front plate 101 through an organic glass cover plate 107, a sand outlet 108 and a steel wire rope outlet 109 are formed in the front plate 101 positioned on the right side of the model box 1, and a displacement sensor is detachably arranged above the left side of the model box 1.
The plate bending support plate 201 is provided with a plate bending mounting opening, the plate bending structure 204 is arranged in the plate bending mounting opening, two ends of the plate bending movable unit rotating shaft 205 penetrating through the plate bending structure 204 are arranged on two sides of the plate bending mounting opening, and the plate bending structure 204 is rotatably connected with the plate bending support plate 201 through the plate bending movable unit rotating shaft 205.
The upper end of the coiled plate structure 204 is provided with a mounting hole through which the coiled plate movable unit rotating shaft 205 can pass, and the coiled plate structure 204 can be rotated after the coiled plate movable unit rotating shaft 205 passes through the mounting hole, and since the left side of the model box body 1 is soil body when the coiled plate structure 204 is tested at the beginning, the left side of the coiled plate structure 204 is supported by the soil body, the right side of the coiled plate structure 204 is a movable gate 203, and the movable gate 203 is positioned on the right side of the coiled plate structure 204 when the test is not started, so that the coiled plate structure 204 is supported. When the test starts, the movable gate 203 moves downward, and the right side of the coiled plate structure 204 is not supported, so that the movable gate rotates to the right, and the soil on the left side after the rotation of the coiled plate structure 204 falls on the right side of the model box 1.
The above-mentioned gate mobile device 4 that still includes, gate mobile device 4 includes braced frame 401, servo motor 402, ball 403, guiding axle 404 and wire rope drags connecting plate 405, servo motor 402 sets up outside braced frame 401, ball 403, guiding axle 404 and wire rope drags connecting plate 405 setting are in braced frame 401, ball 403 and guiding axle 404 are parallel to each other and all pass wire rope drags connecting plate 405, be connected through linear bearing 406 between guiding axle 404 and the wire rope drags connecting plate 405, servo motor 402 links to each other with ball 403, be provided with the wire rope connecting piece of being connected with wire rope 301 on the wire rope drags connecting plate 405.
The sand box forming machine further comprises a sand box 5, the sand box 5 is a box body with an opening at the upper end, the sand box 5 is tightly attached to the model box body 1, a soil body on the right side of the model box body 1 passes through a sand outlet 108 of a front plate 101 of the model box body 1 and then enters the sand box 5 after passing through a connecting port arranged on a rear plate of the sand box 5, and the sizes of the connecting port and the sand outlet 108 are the same.
The lower pulley block 303 is covered with a bottom support plate 305 for the sand box, and the bottom support plate 305 for the sand box prevents the lower pulley block 303 from contacting with the soil body falling on the right side of the model box 1.
A wire rope sleeve 306 is arranged between the pulley block support plate 304 and the sand box bottom support plate 305, and the wire rope 301 passes through the pulley block support plate 304 after passing through the upper pulley block 302, enters the wire rope sleeve 306, then passes through the sand box bottom support plate 305, and is connected with the gate moving device 4 after passing through the lower pulley block 303.
The heights of the sand outlet 108 and the connecting port are h, the sum of the thickness of the front plate 101 where the sand outlet 108 is positioned and the thickness of the rear plate of the sand storage box where the connecting port is positioned is D, and the requirement that h/D is larger than the tangent value of the soil repose angle is met.
The upper pulley block 302 and the lower pulley block 303 are respectively provided with two groups, and the end parts of the steel wire ropes 301 are connected with the two ends of the movable gate 203.
The two sides of the upper end opening of the model box body 1 are provided with T-shaped guide rails, a displacement sensor above the left side of the model box body 1 is fixed through a displacement sensor mounting bracket, and the displacement sensor mounting bracket is fixedly arranged on the T-shaped guide rails through bolts.
The servo motor 402 is provided with a right-angle reducer, and the right-angle reducer is connected with the ball screw 403 through a coupling.
The pulley block comprises 7 pulleys, of which 4 are mounted on pulley block support plates 304 and 3 are mounted on the bottom plate 105 of the model housing 1.
The steel wire ropes 301 comprise 2 steel wire rope 301 connecting pieces, two ends of the steel wire rope 301 connecting pieces are respectively connected, one end of each steel wire rope is arranged on the movable gate 203, and the other end of each steel wire rope is arranged on the steel wire rope dragging connecting plate and supported and conducted through the pulley block;
one end of the coupler is connected with the ball screw 403 transmission structure, and the other end is connected with the right-angle reducer.
The rolled plate structure 204 is comprised of 9 pieces.
The working principle of the invention is as follows:
the device is placed on a geotechnical centrifuge work hanging basket platform, a model foundation soil body is filled in a cavity at the left side of a model box body 1, in order to ensure that a coiled plate structure 204 of the model box body 1 is smoothly turned over, a first layer of coiled plate structure 204 is turned over to the right before a test starts, the top of a movable gate 203 supports the first layer of the folded coiled plate structure 204, and the first layer of coiled plate structure 204 is kept vertical to the movable gate 203 (coiled plate supporting plate); the servo motor 402 drives the steel wire rope to drag the connecting plate to move towards the front plate direction of the model box body 1, the steel wire rope 301 drives the movable gate 203 to move downwards to the position of the second coiled plate structure 204 through the steel wire rope guide mechanism, the second coiled plate structure 204 is folded smoothly under the action of centrifugal force, and the first excavation is carried out on the model foundation by matching with the scraping plate of the centrifugal machine manipulator; the displacement sensor erected on the T-shaped guide rail can monitor the foundation soil settlement outside the foundation pit when the foundation pit is excavated for the first time; repeating the above actions, and excavating deeper soil layers.
A part of the mold soil excavated in the foundation pit is accommodated in a cavity formed by the flask bottom support plate 305, the left side plate 102 of the mold box 1, the front plate 101 of the mold box 1, the back plate 104 of the mold box and the gate support plate 202, and the other part of the mold soil flows into the sand storage box 5 from the sand outlet.
In the super-gravity geotechnical centrifuge, the working space is limited, the length direction of the dragging device of the movable gate 203 is required to be arranged in the width direction of the model box 1, one end of a steel wire rope 301 of the device is connected with the movable gate 203, the other end of the device is connected with a steel wire rope dragging connecting plate of a gate moving device, and the dragging force is reversed through a pulley arranged on a pulley block supporting plate 304 and a pulley arranged on a sand box bottom supporting plate 305.
The gate dragging device is driven by a servo motor 402, the servo motor 402 drives a ball screw 403 to drive a structure to rotate after being decelerated and reduced at right angles, the ball screw 403 converts the rotation into linear motion, and drives a steel wire rope to drag a connecting plate to horizontally move along a guide shaft 404.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. Plate bending type foundation pit excavation simulation device under supergravity environment, its characterized in that: comprises a model box body (1) and a coiled plate type simulation structure (2), wherein the model box body (1) is a rectangular box body with an opening at the upper end, the coiled plate type simulation structure (2) is arranged in the model box body (1) and divides the model box body (1) into a left part and a right part, soil bodies are placed at the left part of the model box body (1), the coiled plate type simulation structure (2) comprises a coiled plate supporting plate (201) and a gate supporting plate (202) which are arranged in parallel and a movable gate (203) arranged between the two, a plurality of rotatable coiled plate structures (204) are arranged on the coiled plate supporting plate (201), the movable gate (203) can be lifted and lowered under the driving of a steel wire rope guiding mechanism (3), the coiled plate structures (204) positioned at the left side of the movable gate are sequentially rotated to the right, the soil bodies drop into the right side of the model box body (1) through gaps generated after the coiled plate structures (204) are rotated,
the steel wire rope guiding mechanism (3) is arranged in the right side of the model box body (1), the steel wire rope guiding mechanism (3) comprises a steel wire rope (301) and a pulley block, the pulley block comprises an upper pulley block (302) and a lower pulley block (303), the upper pulley block (302) is arranged at the upper end of the model box body (1) through a pulley block supporting plate (304), the lower pulley block (303) is arranged at the bottom of the model box body (1), one end of the steel wire rope (301) is connected with the upper end of a movable gate (203), then the steel wire rope (301) penetrates out of the model box body (1) after passing through the upper pulley block (302) and the lower pulley block (303) and is connected with a gate moving device (4), the gate moving device (4) pulls the steel wire rope (301) to realize up-down movement of the movable gate (203),
a coil mounting opening is formed in the coil supporting plate (201), a coil structure (204) is arranged in the coil mounting opening, two ends of a coil movable unit rotating shaft (205) passing through the coil structure (204) are arranged at two sides of the coil mounting opening, the coil structure (204) is rotationally connected with the coil supporting plate (201) through the coil movable unit rotating shaft (205),
the device also comprises a gate moving device (4), the gate moving device (4) comprises a supporting frame (401), a servo motor (402), a ball screw (403), a guide shaft (404) and a steel wire rope dragging connecting plate (405), the servo motor (402) is arranged outside the supporting frame (401), the ball screw (403), the guide shaft (404) and the steel wire rope dragging connecting plate (405) are arranged in the supporting frame (401), the ball screw (403) and the guide shaft (404) are parallel to each other and all penetrate the steel wire rope dragging connecting plate (405), the guide shaft (404) is connected with the steel wire rope dragging connecting plate (405) through a linear bearing (406), the servo motor (402) is connected with the ball screw (403), a steel wire rope connecting piece connected with the steel wire rope (301) is arranged on the steel wire rope dragging connecting plate (405),
the two sides of the upper end opening of the model box body (1) are provided with T-shaped guide rails, a displacement sensor above the left side of the model box body (1) is fixed through a displacement sensor mounting bracket, and the displacement sensor mounting bracket is fixedly arranged on the T-shaped guide rails through bolts.
2. The coiled plate type foundation pit excavation simulation device under a hypergravity environment according to claim 1, wherein: the model box body (1) comprises a front plate (101), a left side plate (102), a right side plate (103), a back plate (104) and a bottom plate (105), wherein the front plate (101) is provided with an opening, an organic glass window (106) is arranged at the opening, the periphery of the organic glass window (106) is fixed on the front plate (101) through an organic glass cover plate (107), a sand outlet (108) and a steel wire rope outlet (109) are formed in the front plate (101) positioned on the right side of the model box body (1), and a displacement sensor is detachably arranged above the left side of the model box body (1).
3. The coiled plate type foundation pit excavation simulation device under the hypergravity environment according to claim 2, wherein: still including storing up sand box (5), store up sand box (5) and be upper end open-ended box, store up sand box (5) and hug closely model box (1) setting, and the soil body on model box (1) right side is through the play sand mouth (108) of front bezel (101) of model box (1) again through setting up in storing up sand box (5) after the connector on the back plate, in connector and play sand mouth (108) the size the same.
4. The coiled plate type foundation pit excavation simulation device under a hypergravity environment according to claim 1, wherein: the lower pulley block (303) is covered with a sand-filling box bottom supporting plate (305), and the sand-filling box bottom supporting plate (305) enables the lower pulley block (303) to avoid contact with soil dropping on the right side of the model box body (1).
5. The coiled plate type foundation pit excavation simulation device under the hypergravity environment of claim 4, wherein the simulation device is characterized in that: a steel wire rope sleeve (306) is arranged between the pulley block supporting plate (304) and the sand box bottom supporting plate (305), a steel wire rope (301) passes through the pulley block supporting plate (304) after passing through the upper pulley block (302), enters the steel wire rope sleeve (306), then passes through the sand box bottom supporting plate (305), and is connected with the gate moving device (4) after passing through the lower pulley block (303).
6. The coiled plate type foundation pit excavation simulation device under a hypergravity environment according to claim 3, wherein: the heights of the sand outlet (108) and the connecting port are h, the sum of the thickness of the front plate (101) where the sand outlet (108) is positioned and the thickness of the rear plate of the sand storage box where the connecting port is positioned is D, and the requirement that h/D is larger than the tangent value of the soil repose angle is met.
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