CN211553993U - Simulation device for regulating shield floating of mudstone stratum - Google Patents
Simulation device for regulating shield floating of mudstone stratum Download PDFInfo
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- CN211553993U CN211553993U CN202020229196.2U CN202020229196U CN211553993U CN 211553993 U CN211553993 U CN 211553993U CN 202020229196 U CN202020229196 U CN 202020229196U CN 211553993 U CN211553993 U CN 211553993U
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Abstract
The utility model discloses a analogue means for regulating and control mudstone stratum shield upward floating, include the analog system, shield structure come-up regulation and control system, sensing system and processing system, the model system includes the mold box, tunnel model, section of jurisdiction model and preceding, back shroud, preceding, back shroud are used for fixed section of jurisdiction model, shield structure come-up regulation and control system is the drain bar of mold box bottom and the drinking-water pipe and the pump that links to each other with it, sensing system is for installing the measuring equipment on section of jurisdiction model, is connected with processing system. The working condition of mudstone tunnel shield construction is simulated, morphological parameter measurement is carried out after the shield floats, automatic regulation and control of shield floating are achieved after analysis and treatment of a treatment system, a shield floating mechanism in a mudstone stratum is disclosed, a reference suggestion is provided for engineering construction, and the purposes of avoiding tunnel invasion limit and segment dislocation, breakage and water seepage are achieved.
Description
Technical Field
The utility model relates to a tunnel construction model test field, concretely relates to analogue means for regulating and controlling shale stratum shield come-up.
Background
Mudstone is extremely widely distributed in China, and as urban subway career in China develops continuously, shield construction is inevitably required to be carried out in mudstone areas, as the mudstone contains more hydrophilic clay minerals, larger volume change can be caused when the moisture content changes, water absorption expansion and water loss shrinkage are easy, the mudstone has larger plasticity, deformation is easy to generate after stress, volume expansion and instability can be generated particularly after water contact, the engineering stability is poor, and the serious segment floating problem is brought to shield construction. Therefore, if the water absorption expansion rule and the shield floating mechanism of different mudstone strata can be mastered, corresponding measures can be correspondingly taken to avoid the shield tunnel from being invaded to limit, and the accidents of dislocation, breakage and water seepage of the segments occur, so that the water absorption expansion rule and the shield floating mechanism of the mudstone strata can be obtained, reliable technical proposal and data support can be provided for the shield construction of the mudstone strata, and the important task to be solved urgently in the construction process of the mudstone strata can be realized.
In the prior art, when shield construction is carried out on a mudstone stratum, most projects are made according to local conditions, corresponding countermeasures are taken according to actual conditions encountered by the projects, and a set of effective methods and countermeasures are not formed. Chinese patent publication No. CN108872297A discloses that the simulation test system of "a shield tail grouting slurry coagulation and segment floating process model test device" has the following problems: the problem of upward floating of the pipe piece caused by buoyancy generated by water absorption and expansion of the mudstone in the mudstone stratum cannot be truly simulated, and the shield can not be automatically prevented from upward floating and eliminated from upward floating. In addition, some projects adopt finite element modeling for analysis, but the finite element analysis method is too strong in theory and cannot replace the actual shield floating condition of a mudstone stratum, technical parameters are often artificially introduced, and the reference significance and the application value are not large, so that laboratory system equipment is urgently needed, the system equipment can be simply operated, and meanwhile, the floating process of the segment in the actual project when slurry is not condensed can be simulated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of overcoming the defects in the prior art, and aims to provide a simulation device for regulating and controlling the upward floating of a mudstone stratum shield, aiming at solving the problems that the mudstone water absorption expansion rule and the shield upward floating mechanism can not be obtained in advance in the construction process of the mudstone stratum shield, and the upward floating of the mudstone stratum shield can not be regulated and controlled by engineering construction during the construction process, so that accidents such as wrong table of segments, breakage, water seepage and the like can not be prevented in advance, the simulation device and the experimental method for regulating and controlling the upward floating of the mudstone stratum shield are provided, the simulation system comprises a model system, a shield upward floating simulation system, a shield upward floating regulation and control system and a sensing system, the construction condition of the mudstone stratum shield is simulated by the model system, the shield upward floating condition is simulated by the shield upward floating simulation system, the shield upward floating, the shield floating morphological parameters are measured by a sensing system, and the processing system is utilized for analysis, processing and regulation, so that the dynamic evolution rule of mudstone water absorption and expansion and the shield floating mechanism are disclosed, the shield floating is automatically regulated and controlled, the shield floating phenomenon is eliminated, reference and effective suggestion are provided for regulating and controlling the floating of the duct piece in engineering construction, and the problems of duct piece dislocation, breakage, water seepage and the like are effectively avoided.
The utility model discloses a following technical scheme realizes:
the simulation device for regulating and controlling the shield floating of the mudstone stratum comprises a model system, a shield floating simulation system, a shield floating regulation and control system, a sensing system and an external processing system, wherein the model system comprises a model box for containing mudstone, a tunnel model, a duct piece model, a front cover plate and a rear cover plate, tunnel holes for installing the tunnel model are respectively formed in the front and the rear of the model box, so that the tunnel model can be erected on the tunnel holes and pushed out of the tunnel holes, and a simulation shield excavation mudstone tunnel is formed;
the shield floating simulation system comprises a water injection pipe, a water delivery pipe and a micro water pump, wherein the water injection pipe is horizontally laid at the lower part of the tunnel model for a certain distance, is connected with the water delivery pipe and the micro water pump and is used for pressure water injection to force mudstone to generate buoyancy;
the shield floating regulation and control system comprises a drainage plate, a water pumping pipe and a pump, wherein the drainage plate is flatly paved at the bottom of the model box and connected with the water pumping pipe and the pump, and is used for eliminating mudstone buoyancy and preventing the shield from floating;
the sensing system is a displacement meter and an inclinometer, and the displacement meter and the inclinometer are installed in the segment model and connected with the processing system and are used for measuring morphological parameters of the shield after floating and automatically regulating and controlling the shield to float;
the processing system is prior art, can purchase the income on the market, and processing system is connected with this device, and processing system is including being used for gathering sensing system records the shield and floats the data acquisition device of back morphological parameter, data acquisition device connects the intelligent processing device who is used for storing, analysis shield to float morphological parameter and confirm target control instruction, intelligent processing device connects the transmission device who is used for transmitting target control instruction, transmission device transmits target control instruction to target control main part, through shield upward floating regulation and control system automatic regulation shield upward floating eliminates shield upward floating phenomenon.
After the shield is excavated, water is injected into mudstone under pressure through a shield floating simulation system, and the mudstone absorbs water and expands to generate buoyancy, so that the shield floats upwards. In this scheme, tunnel model is after pushing out from the mudstone in, expose simulation shield and excavate the mudstone tunnel, put into the section of jurisdiction model, before installing, the back shroud, pressure water injection in to the mudstone, thereby produce the shield in the simulation mudstone stratum shield construction process and come up, and carry out the measurement of section of jurisdiction flotation volume and section of jurisdiction intermediate angle through the sensing system who installs in the section of jurisdiction model, rely on processing system analysis to obtain mudstone water absorption expansion law and shield floating mechanism and oneself and judge current come-up condition and obtain the target control instruction, through transmission device transmits target control instruction to the pump, regulates and control the shield through shield floating regulation and control system automatic regulation and control shield floating, eliminates the shield and constructs the floating phenomenon, provides reference and effective suggestion for engineering construction regulation and control mudstone stratum shield floating.
According to the scheme, mudstone stratum shield floating is simulated through a model system and a shield floating simulation system, the floating of the shield is measured by relying on a sensing system installed in a segment model, the parameters are collected and transmitted to an intelligent processing device by a collecting device of the processing system, the mudstone water absorption expansion rule and a shield floating mechanism are obtained by analysis and calculation of the intelligent processing device, a target control instruction is obtained by self-judging the current floating condition, the shield floating is automatically regulated and controlled by a shield floating regulation and control system to float upwards, the shield floating phenomenon is eliminated, and the segment dislocation in the actual construction process of the tunnel is avoided, the tunnel is broken, and water seepage and other accidents are avoided.
The model system comprises a model box for containing mudstone, a tunnel model for simulating shield excavation, a segment model, a front cover plate and a rear cover plate, the shield upward floating simulation system comprises a water injection pipe, a water delivery pipe and a micro water pump, the shield upward floating regulation system comprises a water discharge plate, a water suction pipe and a suction pump, tunnel holes are respectively formed in the front and the rear of the model box, the tunnel model can be erected on the tunnel holes and can be pushed out along the holes, the condition that the shield excavates a mudstone tunnel is simulated, the segment model is placed in the segment model, the segment model is fixed by the front cover plate and the rear cover plate, the micro water pump is opened to inject water into the mudstone through the water injection pipe, the segments in the model box generate an upward floating phenomenon under the buoyancy effect generated by mudstone water absorption and expansion, the condition that the segments in the construction of the mudstone tunnel shield are floated is simulated, the vacuum negative pressure intensity of the water suction pipe, the mudstone of splendid attire can select according to actual conditions in this scheme model case to the tunnel construction operating mode of different mudstone stratums is realized simulating, and the flexibility is stronger, and application scope is very extensive.
The simulation system is simple in composition and convenient to operate, can simulate the mudstone water absorption expansion process and the floating process of the pipe piece under the buoyancy effect generated by mudstone water absorption expansion in actual engineering, and can regulate and control the floating of the shield, so that the mudstone water absorption expansion rule and the shield floating mechanism are revealed.
Preferably, the length of the tunnel model is greater than the distance between the front end face tunnel hole and the rear end face tunnel hole of the model box, the tunnel model can be erected on the tunnel holes of the model box, and after mudstone is filled into the model box, the tunnel model is pushed out from one end along the holes, so that the simulated shield is formed to dig the tunnel in the mudstone stratum.
The tunnel model is a cylindrical thin-wall aluminum barrel without an upper bottom surface and a lower bottom surface.
Preferably, the segments of the segment model are connected through flexible springs, and waterproof rubber films are laid on the inner wall of the segment model.
The duct piece model, the front end duct piece and the rear end duct piece are matched with the inner wall fixing grooves of the front cover plate and the rear cover plate, so that the duct piece model can be fixed with the cover plates.
The lower part of the segment model is provided with a metal frame, and the two ends of the metal frame are respectively fixed on the segments at the front end and the rear end and are used for supporting the segment model, so that the segment model is not deviated or misdirected in the installation process.
The segment model is made of gypsum.
Preferably, the front cover plate is provided with a wire passing hole for a sensing system to pass through.
Because the sensing system for measuring the shield floating morphological parameters is arranged in the segment model, the sensing system is a displacement meter and an inclinometer, the measuring equipment is required to be connected with the processing system, and the wiring hole is formed in the front cover plate for the wiring of the measuring equipment to pass through.
The wire passing hole is matched with the wiring.
Preferably, the water injection pipe is double-deck water injection pipe, including inner tube and outer tube, the water injection hole is all seted up on inner tube and outer tube upper portion and can coincide, during the water injection, makes the coincidence of interior outer tube water injection hole can go out water, when stopping the water injection, makes the inner tube around the rotatory certain angle of axis, and interior outer tube water injection hole dislocation can seal the water injection hole, double-deck water injection pipe is used for preventing that water from carrying the silt particle backward flow, blocks up the pipeline.
Preferably, the drainage plate is provided with geotextile and sealed at the periphery for preventing mudstone from being pumped out.
The method comprises the steps of forming a shield excavation mudstone tunnel, loading a segment model, injecting water through a micro water pump under pressure, simulating the real state of shield floating under the mudstone environment by adopting the mode, ensuring that the simulation system of the scheme is closer to the real environment of construction in the mudstone area, obtaining a relatively accurate and reliable mudstone water absorption expansion rule and shield floating form parameters, and making sufficient preparation for later analysis of a shield floating mechanism.
The floating force generated by water absorption expansion of the mudstone is the main reason for upward floating of the shield, and the vacuum pumping negative pressure strength of the drainage plate is changed through the pump, so that the mudstone excess pore water pressure is eliminated, the upward floating of the shield is regulated and controlled, the influence degree of the pore water pressure on the mudstone expansion is analyzed more thoroughly, and the effect of the mudstone water absorption expansion on the upward floating of the regulating and controlling pipe piece is analyzed.
Preferably, the model box is a rectangular box body with a back pressure plate mounted at the top end, the back pressure plate is detachably connected with the model box, the model box is opened and closed through the back pressure plate, and the model box and the back pressure plate are fixed through bolts.
The model box is opened and/or closed through the back pressure plate, so that the simulation system is arranged and installed in the experimental process, mudstones with different attributes are filled as required, and the shield segment floating analysis under various different mudstone environments is carried out.
And the four directions of the periphery of the tunnel hole on the front end surface and the rear end surface of the model box, namely the upper direction, the lower direction, the left direction and the right direction, are respectively provided with a lock catch for fixing the front cover plate and the rear cover plate.
And the front end surface of the model box is positioned below the tunnel hole at a certain distance and is provided with water delivery holes which are uniformly distributed horizontally.
Because the water injection pipe needs to be connected with the micro water pump through a water pipe, the water injection pipe is connected with the water injection pipe through the water delivery hole formed in the model box.
The water delivery hole is matched with the water delivery pipe.
And the front end surface of the model box is positioned below the water delivery hole and is provided with a water pumping hole.
Because the drain bar needs to pass through the drinking-water pipe with the suction pump and is connected, through seting up the pumping hole on the mold box for the connection of drinking-water pipe and drain bar.
The pumping hole is matched with the pumping pipe.
The displacement meter and the inclinometer are arranged on each section of pipe piece of the pipe piece model, and the displacement meter and the inclinometer are respectively arranged on the lower part of the inner surface of each section of pipe piece.
The displacement meter is used for measuring the floating amount of each segment of pipe piece at each measuring time point, and the inclinometer is used for measuring the field angle between the pipe pieces at each measuring time point, so that the shield floating morphological parameters are obtained, and basic data are provided for analyzing a shield floating mechanism.
Preferably, the displacement meter is a linear displacement sensor.
Preferably, the inclinometer is a dual axis inclination sensor.
The processing system is the prior art and can be purchased on the market, and comprises a data acquisition device for acquiring the morphological parameters of the shield after the shield floats upwards, which are measured by the sensing system, the data acquisition device is connected with an intelligent processing device for storing and analyzing the morphological parameters of the shield floats upwards and determining a target control instruction, the intelligent processing device is connected with a transmission device for transmitting the target control instruction, and the transmission device transmits the target control instruction to a target control main body.
Preferably, the data acquisition device is a data acquisition instrument, the data acquisition instrument is used for acquiring the segment floating amount measured by the displacement meter and the segment field angle measured by the inclinometer, the data acquisition instrument is connected to the artificial intelligence processing device, the artificial intelligence processing device is a computer system, the computer system can also store data monitored by the sensing system, and an analysis module is arranged in the computer system for data analysis.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model discloses a analogue means for regulating and control mud rock stratum shield upward floating, simulate out mud rock stratum shield upward floating phenomenon through model system and shield structure upward floating analogue system, rely on the sensing system who installs in section of jurisdiction model to measure the shield structure morphological parameter that floats, and rely on processing system's collection system to gather and transmit these morphological parameters to intelligent processing apparatus, thereby through processing apparatus's analytical calculation, obtain mud rock water absorption expansion law and shield structure upward floating mechanism, and then rely on shield structure upward floating regulation and control system to regulate and control the shield upward floating, avoid the tunnel to take place the section of jurisdiction mistake in the actual work progress, breakage, calamity accidents such as infiltration;
2. the utility model discloses a analogue means for regulating and control mud rock stratum shield structure come-up packs the section of jurisdiction model into the mud rock tunnel, covers preceding, back shroud fixed section of jurisdiction model, adopts this kind of mode, can simulate out the section of jurisdiction true state under the mud rock environment, guarantees that the analogue system of this scheme more pastes the true environment that the mud rock stratum shield constructs the construction, obtains comparatively accurate mud rock water absorption expansion law and shield structure come-up form parameter, makes sufficient preparation for the later stage carries out the analysis of shield structure come-up mechanism;
3. the utility model discloses a analogue means for regulating and control mudstone stratum shield and construct come-up, a displacement meter and an inclinometer are evenly arranged to the internal surface lower part at every section of jurisdiction, and this kind of mode makes the arrangement of displacement meter and inclinometer more comprehensive, can measure all section of jurisdiction come-up circumstances, makes data analysis, processing more accurate, also more presses close to at the actual construction situation of mudstone stratum, makes the mudstone stratum shield that the analogue system of this scheme obtained go-up the mechanism analysis more accurate;
4. the utility model is used for regulation and control mudstone stratum shield structure analogue means of come-up, when splendid attire mudstone in the mold box, the type of mudstone is similar with the mudstone in the actual work progress, when the different mudstone stratum tunnel excavation in-process of analysis shield the come-up problem, corresponds and takes corresponding mudstone type to the shield that obtains this mudstone stratum constructs the come-up mechanism, and provides the scheme that corresponds. The simulation system and the experimental method of the utility model can be used for the simulation analysis of various mudstone types and provide suggestions and reference suggestions for the construction of actual engineering;
5. after installing section of jurisdiction model and preceding, back shroud, through water injection pipe pressure water injection in to the mudstone, can simulate the mudstone and produce different buoyancy, obtain the shield and construct the come-up condition under different mudstone buoyancy, through to the drain bar evacuation drainage, eliminate the condition that the shield floated under the different evacuation negative pressure intensity, carry out many-sided analysis from the multiple condition that obtains, obtain more comprehensive and wide range data reference.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of a tunnel model and a model box of a model system of the simulation system of the present invention;
FIG. 2 is a schematic diagram of a model system structure of the simulation system of the present invention;
FIG. 3 is a schematic view of the simulation system of the present invention showing a state after the rotation of the inner water pipe of the water injection pipe is stopped;
fig. 4 is a schematic layout of a sensing system of the simulation system of the present invention;
fig. 5 is a schematic layout view of another viewing angle of the simulation system of the present invention;
fig. 6 is a schematic diagram of the field layout of the simulation system of the present invention;
reference numbers and corresponding part names in the drawings:
1-mold box, 2-tunnel mold, 3-tunnel hole, 4-segment mold, 41-segment, 42-flexible spring, 43-metal frame, 44-rubber film, 5-displacement meter, 6-inclinometer, 7-water injection pipe, 71-water injection hole, 72-inner pipe, 73-outer pipe, 8-water injection pipe, 9-water injection hole, 10-micro water pump, 11-drainage plate, 12-geotextile, 13-water pumping hole, 14-water pumping pipe, 15-water pumping, 16-back pressure plate, 17-cover plate, 171-line passing hole, 172-fixed groove.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
As shown in fig. 1 to 6, the simulation device for regulating shield floating of mudstone strata comprises a model system, a shield floating simulation system, a shield floating regulation system, a sensing system and a processing system, wherein the model system comprises a model box 1 for containing mudstone, a tunnel model 2 for simulating shield excavation, a segment model 4, a front cover plate 17 and a rear cover plate 17, the front end surface and the rear end surface of the model box 1 are provided with tunnel holes 3 for installing the tunnel model 2, so that the tunnel model 2 can be erected on the tunnel holes 3 and pushed out of the holes, and a mudstone tunnel for simulating shield excavation is formed;
the shield floating simulation system comprises a water injection pipe 7, a water delivery pipe 8 and a micro water pump 10, wherein the water injection pipe 7 is horizontally laid at the lower part of the tunnel model 2 for a certain distance, is connected with the water delivery pipe 8 and the micro water pump 10, and is used for pressure water injection to force mudstone to generate buoyancy;
the shield floating regulation and control system comprises a drainage plate 11, a water pumping pipe 14 and a pump 15, wherein the drainage plate 11 is laid at the bottom of the model box 1 and connected with the water pumping pipe 14 and the pump 15, and is used for eliminating mudstone buoyancy and preventing the shield from floating;
the sensing system comprises a displacement meter 5 and an inclinometer 6, wherein the displacement meter 5 and the inclinometer 6 are installed in the segment model 4, connected with the processing system and used for measuring the shield floating morphological parameters and automatically regulating shield floating;
the processing system is prior art, including being used for gathering the sensing system records the shield and floats the data acquisition device of back morphological parameter, data acquisition device connects the intelligent processing device who is used for storing, analysis shield to float morphological parameter and confirm target control instruction, intelligent processing device connects the transmission device who is used for transmitting target control instruction, transmission device transmits target control instruction to the target control main part, through shield upward floating regulation and control system automatic regulation shield upward floating eliminates shield upward floating phenomenon.
After the shield is excavated, water is injected into the mudstone through the shield floating simulation system, and the mudstone absorbs water and expands to generate buoyancy, so that the shield floats upwards. In the scheme, after the tunnel model 2 is pushed out from mudstone, the simulation shield is exposed to excavate the mudstone tunnel, the segment model 4 is placed, the two cover plates 17 before and after installation inject water into the mudstone under pressure, thereby simulating the floating of the shield in the construction process of the mudstone stratum shield, measuring the segment floating amount and the opening angle between the segments 41 is carried out through the sensing system installed in the segment model 4, analyzing by the processing system to obtain the mudstone water absorption expansion rule and the shield floating mechanism and judging the current floating condition by self to obtain the target control instruction, transmitting the target control instruction to the target control main body through the transmission device, automatically regulating and controlling the shield floating through the shield floating regulation and control system, eliminating the shield floating phenomenon and providing reference and effective suggestion for regulating the floating of the mudstone stratum shield in engineering construction.
This embodiment simulates out the mud rock stratum shield through model system and shield structure come-up analog system and floats upward, rely on the sensing system who installs in section of jurisdiction model 4 to measure the shield structure morphological parameter that floats upward, and rely on processing system's collection system to gather and transmit these parameters to intelligent processing apparatus, thereby through intelligent processing apparatus's analytical calculation, obtain mud rock water absorption expansion law and shield structure come-up mechanism, obtain target control instruction from judging current come-up condition, regulate and control the shield through shield structure come-up regulation and control system automatic regulation and control shield structure come-up, eliminate the shield structure phenomenon of floating upward, avoid the tunnel to take place the section of jurisdiction slab staggering in actual work progress, it is broken, accidents such as infiltration.
In the concrete implementation, the front and the back of the model box 1 are respectively provided with a tunnel hole 3, so that the tunnel model 2 can be erected on the tunnel hole 3 and can be pushed out along the hole, the condition that a shield is used for excavating a mudstone tunnel is simulated, a segment model 4 is put into the tunnel, a front cover plate 17 and a back cover plate 17 are installed and fixed on the segment model 4, a micro water pump 10 is opened to inject water into the mudstone through a water conveying pipe 8 and a water injection pipe 7, the segment 41 in the model box 1 generates a floating phenomenon under the buoyancy effect generated by water absorption and expansion of the mudstone, thereby simulating the condition that the shield construction segment of the mudstone tunnel floats upwards, changing the vacuum pumping negative pressure intensity of the drainage plate by the pump, thereby eliminating the pressure of mudstone over-pore water, regulating and controlling the floating of the shield, selecting the mudstone contained in the model box according to the actual situation, therefore, the tunnel construction working conditions of different mudstone strata can be simulated, the flexibility is high, and the application range is wide.
The simulation system is simple in composition and convenient to operate, can simulate the mudstone water absorption expansion process and the floating process of the pipe piece under the buoyancy effect generated by mudstone water absorption expansion in actual engineering, and can regulate and control the floating of the shield, so that the mudstone water absorption expansion rule and the shield floating mechanism are revealed.
As a preferred embodiment, the length of the tunnel model 2 is greater than the distance between the front and rear end face tunnel holes 3 of the model box 1, the tunnel model 2 can be erected on the tunnel holes 3 of the model box, and after mudstone is filled into the model box 1, the tunnel model 2 is pushed out along the holes from one end, so that a simulated shield is formed to dig a tunnel in the mudstone stratum.
Further, the tunnel model 2 is a cylindrical thin-wall aluminum barrel without an upper bottom surface and a lower bottom surface.
In a preferred embodiment, the segments 41 of the segment model 4 are connected by flexible springs 42, and a waterproof rubber film 44 is laid on the inner wall of the segment model 4.
Further, the duct pieces 41 on the front and rear ends of the duct piece model 4 are adapted to the fixing grooves 172 on the cover plate 17, so that the duct piece model 4 can be fixed to the cover plate 17.
Further, the lower part of the segment model 4 is provided with a metal frame 43, and the two ends of the metal frame 43 are respectively fixed on the front and rear end segments 41 for supporting the segment model 4, so that the segment model 4 is not deviated or misoriented in the installation process.
Further, the segment model 4 is made of gypsum, and the metal frame 43 is made of stainless steel, so that the service life of the model system can be greatly prolonged.
As one of the preferable embodiments, the front cover plate 17 is provided with a wire passing hole 171 for passing a wiring of a sensing system, since the sensing system for measuring the shield floating morphological parameter is arranged in the segment model 4, the sensing system is a displacement meter 5 and an inclinometer 6, the measuring equipment needs to be connected with a processing system, the front cover plate 17 is provided with the wire passing hole 171 for passing the wiring of the measuring equipment, and the size of the wire passing hole 171 is matched with the wiring.
As one of the preferable embodiments, the water injection pipe 7 is a double-layer water injection pipe, and includes an inner pipe 72 and an outer pipe 73, the upper parts of the inner pipe 72 and the outer pipe 73 are both provided with water injection holes 71 and can be overlapped, when water is injected, the inner pipe 71 and the outer pipe 71 are overlapped to discharge water, when the water injection is stopped, the inner pipe 72 is rotated by a certain angle around the axis, the inner pipe 71 and the outer pipe 71 are dislocated to seal the water injection holes, and the double-layer water injection pipe 7 is used for preventing water from carrying with sand to flow back to block the pipeline.
In a preferred embodiment, the drainage plate 11 is laid with geotextile 12 and sealed at the periphery for preventing mudstone from being pumped out by the pump 15.
And forming a shield excavation mudstone tunnel, loading the mud rock tunnel into the segment model 4, and injecting water under pressure through the miniature water pump 10. By adopting the mode, the real state of the shield floating under the mudstone environment can be simulated, the simulation system of the scheme is ensured to be more close to the real environment of construction in the mudstone area, the accurate and reliable mudstone water absorption expansion rule and the shield floating morphological parameters are obtained, and sufficient preparation is made for analyzing the shield floating mechanism in the later period.
The floating force generated by water absorption and expansion of the mudstone is the main reason for upward floating of the shield, the vacuum pumping negative pressure strength of the drainage plate 11 is changed through the pump 15, so that the mudstone excess pore water pressure is eliminated, the upward floating of the shield is regulated and controlled, the influence degree of the pore water pressure on the mudstone expansion is analyzed more thoroughly, and the effect of the mudstone water absorption and expansion on the upward floating of the regulating and controlling pipe piece is analyzed.
In a preferred embodiment, the mold box 1 is a rectangular box body with a back pressure plate 16 mounted on the top end, the back pressure plate 16 is detachably connected to the mold box 1, the mold box 1 is opened and closed by the back pressure plate 16, and the mold box 1 and the back pressure plate 16 are fixed by bolts.
Further, back pressure plate 16's material is iron, opens and/or closes the mold box through back pressure plate 16 to arrange and install the analog system in the experimentation, and fill the mudstone of different attributes as required, carry out the shield under the multiple different mudstone environment and construct section of jurisdiction come-up analysis.
Further, four lock catches are arranged on the two tunnel holes 2 on the front end face and the rear end face of the model box 1, the lock catches are uniformly distributed on the circumference of the tunnel holes 2, and the arranged lock catches are used for fixing the front cover plate 17 and the rear cover plate 17.
Further, the water delivery hole 9 that has horizontal evenly distributed is seted up to the certain distance below tunnel hole 3 to mold box 1 front end face, because water injection pipe 7 need pass through raceway 8 with miniature pump 10 and be connected, through seting up water delivery hole 9 on mold box 1 for water injection pipe 7 and 8 connections of raceway, the size and the raceway 8 adaptation of water delivery hole 9.
Furthermore, a water pumping hole 13 is formed in the front end face of the model box 1 and located below the water delivery hole 9, the water pumping hole 13 is formed in the model box 1 and used for connecting the water pumping pipe 14 with the water discharging plate 11, and the water discharging plate 11 needs to be connected with a water pumping pump 15 through the water pumping pipe 14, and the water pumping hole 13 is matched with the water pumping pipe 14 in size.
As one embodiment, the displacement meter 5 and the inclinometer 6 are installed on each segment of the segment model, one displacement meter 5 and one inclinometer 6 are respectively arranged on the lower part of the inner surface of each segment of the segment model, the displacement meter 5 is used for measuring the floating amount of each segment of the segment 41 at each measuring time point, the inclinometer 6 is used for measuring the opening angle between the segments 41 at each measuring time point, so that the shield floating morphological parameters are obtained, and basic data are provided for analyzing a shield floating mechanism.
Further, the displacement meter 5 is a linear displacement sensor.
Further, the inclinometer 6 is a biaxial inclination sensor.
The processing system comprises a data acquisition device for acquiring the morphological parameters of the shield after the shield floats upwards, the data acquisition device is connected with an intelligent processing device for storing and analyzing the morphological parameters of the shield floats upwards and determining a target control instruction, the intelligent processing device is connected with a transmission device for transmitting the target control instruction, and the transmission device transmits the target control instruction to a target control main body.
As a preferred embodiment, the data acquisition device is a data acquisition instrument, the data acquisition instrument is used for acquiring the floating amount of the segment 41 measured by the displacement meter 5 and the field angle of the segment 41 measured by the inclinometer 6, the data acquisition instrument is connected to an artificial intelligence processing device, the artificial intelligence processing device is a computer system, and the computer system can also store data monitored by the sensing system and is internally provided with an analysis module for data analysis.
Example 2
As shown in fig. 1 and 6, the experimental method for regulating shield floating of a mudstone formation, which regulates shield floating by using the simulation system in embodiment 1, includes the following steps:
a. assembling a model system, predetermining the size of a tunnel model 2, arranging tunnel holes 3 corresponding to the tunnel model 2 on the front end surface and the rear end surface of a model box 1, arranging water delivery holes 9 and water pumping holes 13 at the same time, fixing the model box 1 after the model box is prepared, arranging a wire passing hole 171 on a front cover plate 17, and arranging a shield floating simulation system and a shield floating regulation and control system at the bottom of the model box;
b. moving the tunnel model 2 into the model box 1, erecting the tunnel model on a tunnel hole 3 of the model box 1, and laying mudstone to be analyzed in the model box 1;
c. pushing out the tunnel model 2 to form a simulation shield for excavating the mudstone tunnel;
d. arranging the sensing system in the segment model 4;
e. installing the segment model 4 in a mudstone tunnel, and installing a front cover plate 17 and a rear cover plate 17 to fix the segment model 4;
f. starting a micro water pump 10 to inject water into the mudstone under pressure;
g. the mudstone water absorption expansion rule and the shield floating mechanism are obtained through the processing system, and the automatic control of the vacuum pumping negative pressure intensity of the shield floating regulation system to eliminate the shield floating is realized.
When mudstone is contained in the model box, the type of the mudstone is similar to that of the mudstone in the actual construction process, and when the shield is floated in the shield excavation process of analyzing different mudstone strata, the corresponding mudstone type is correspondingly adopted, so that a shield floating mechanism of the mudstone stratum is obtained, and a corresponding scheme is provided. The utility model discloses a simulation system and experimental method can be used for the simulation analysis of various mudstone types to construction to actual engineering provides suggestion and reference suggestion.
After installing section of jurisdiction model 4 and preceding, two back apron 17, through water injection pipe 7 to pressure water injection in the mudstone, can simulate the mudstone and produce different buoyancy, obtain the shield and construct the come-up condition under different mudstone buoyancy, through to the drainage of 11 evacuation of drain bar, eliminate the condition that the shield floated under obtaining different evacuation negative pressure intensity, carry out many-sided analysis from the multiple condition that obtains, obtain more comprehensive and wide range data reference.
According to the experimental method, after the mudstone stratum shield floating mechanism is obtained through the experiment of the simulation system, corresponding measures can be taken in the actual construction process to adjust the grouting mode, so that the occurrence of disaster accidents such as duct piece dislocation, breakage, water seepage and the like can be effectively avoided.
As one of the preferred embodiments, as shown in fig. 1 and 2, in the step a, the size of the tunnel model 2 is determined according to the actual engineering, and the size of the tunnel model 2 is to meet the actual tunnel prototype.
As a preferred embodiment, as shown in fig. 4 and 5, in step d, one displacement gauge 5 and one inclinometer 6 are arranged on the lower part of the inner surface of each segment of tube sheet 41, so that the arrangement of the displacement gauge 5 and the inclinometer 6 is more comprehensive.
As one preferred embodiment, as shown in fig. 3, in the step f, after the pressure injection is stopped, the water injection pipe inner pipe 72 is rotated to displace the water injection holes 71, thereby sealing the water injection holes to prevent the water and the sand from flowing back to block the water injection pipe 7.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The simulation device for regulating and controlling the shield floating of the mudstone stratum is characterized by comprising a model system, a shield floating simulation system, a shield floating regulation and control system and a sensing system, wherein the model system comprises a model box (1), tunnel models (2), a segment model (4) and two cover plates (17), two sides of the model box (1) are respectively provided with a tunnel hole (3) for mounting the tunnel model (2), the tunnel model (2) is positioned in one tunnel hole (3) and can be pushed out from the other tunnel hole (3), a mudstone tunnel is formed in the model box (1), the segment model (4) is sequentially mounted in the mudstone tunnel, and the cover plates (17) are respectively fixed at two ends of the segment model (4);
the shield floating simulation system comprises a water injection pipe (7), a water delivery pipe (8) and a micro water pump (10), wherein the water injection pipe (7) is horizontally laid in the model box (1) and is positioned below the tunnel model (2), and the water injection pipe (7) is connected with the water delivery pipe (8) and the micro water pump (10);
the shield floating regulation and control system comprises a drainage plate (11), a water pumping pipe (14) and a pump (15), wherein the drainage plate (11) is tiled at the bottom of the model box (1) and is connected with the water pumping pipe (14) and the pump (15);
the sensing system comprises a displacement meter (5) and an inclinometer (6), wherein the displacement meter (5) and the inclinometer (6) are both positioned on the inner bottom of the segment model (4).
2. The simulation device for regulating shield uplift of a mudstone formation according to claim 1, wherein the segments (41) of the segment model (4) are connected through a flexible spring (42), and a waterproof rubber film (44) is laid on the inner wall of the segment model (4).
3. The simulation device for regulating shield floating of a mudstone formation according to claim 1, wherein the segment model (4) further comprises a metal frame (43) for supporting the segment model (4), the metal frame (43) is located at the bottom of the segment model (4), and two ends of the metal frame (43) are respectively fixed at two ends of the segment model (4).
4. The simulation device for regulating and controlling the shield floating of the mudstone stratum as claimed in claim 1, wherein the model box (1) is a rectangular box body, a top plate of the rectangular box body is an openable back pressure plate, and the back pressure plate is fixed with the model box (1) through bolts.
5. The simulation device for regulating shield uplift of a mudstone formation according to claim 1, wherein a fixing groove (172) is formed in the inner side of the cover plate (17), and the fixing groove (172) is used for fixing the segment (41) at two ends of the segment model (4).
6. The simulation device for regulating and controlling the shield floating of the mudstone formation according to claim 1, wherein the water injection pipe (7) comprises an inner pipe (72) and an outer pipe (73), the upper surfaces of the inner pipe (72) and the outer pipe (73) are respectively provided with a plurality of water injection holes (71) in one-to-one correspondence, six water delivery holes (9) are formed below the tunnel hole (3) on the front end surface of the model box (1), and the water injection holes (71) are connected with a water delivery pipe (8) and a micro water pump (10) through the water delivery holes (9) and used for pressure water injection.
7. The simulation device for regulating shield uplift of a mudstone formation according to claim 1, wherein the drainage plate (11) is horizontally arranged at the bottom of the model box (1), and a geotextile (12) is laid on the upper part of the drainage plate (11).
8. The simulation device for regulating and controlling the shield floating of the mudstone stratum as claimed in claim 6, wherein six water pumping holes (13) are formed below the water delivery hole (9), and the drainage plate (11) is connected with a water pumping pipe (14) and a pump (15) through the water pumping holes (13) and is used for eliminating excess pore water pressure and preventing the shield from floating.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272980A (en) * | 2020-02-29 | 2020-06-12 | 西南石油大学 | Simulation system and experimental method for regulating shield floating of mudstone stratum |
| CN112730083A (en) * | 2020-12-28 | 2021-04-30 | 西南石油大学 | Simulation system and experimental method for regulating duct piece dislocation by using tenon and mortise |
| CN114019134A (en) * | 2021-08-23 | 2022-02-08 | 长安大学 | Combined type shield tunnel wall back grouting simulation device and test method |
| CN114720641A (en) * | 2022-04-18 | 2022-07-08 | 西南交通大学 | Device and method for testing buoyancy dissipation characteristic of subway shield synchronous grouting material |
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2020
- 2020-02-29 CN CN202020229196.2U patent/CN211553993U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272980A (en) * | 2020-02-29 | 2020-06-12 | 西南石油大学 | Simulation system and experimental method for regulating shield floating of mudstone stratum |
| CN111272980B (en) * | 2020-02-29 | 2024-04-19 | 西南石油大学 | Simulation system and experimental method for regulating shield floating of mudstone stratum |
| CN112730083A (en) * | 2020-12-28 | 2021-04-30 | 西南石油大学 | Simulation system and experimental method for regulating duct piece dislocation by using tenon and mortise |
| CN112730083B (en) * | 2020-12-28 | 2024-05-28 | 西南石油大学 | Simulation system and experimental method for regulating and controlling segment staggering by using rebate |
| CN114019134A (en) * | 2021-08-23 | 2022-02-08 | 长安大学 | Combined type shield tunnel wall back grouting simulation device and test method |
| CN114720641A (en) * | 2022-04-18 | 2022-07-08 | 西南交通大学 | Device and method for testing buoyancy dissipation characteristic of subway shield synchronous grouting material |
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