CN104849429A - Stratum adaptability test method of shield with soil chamber simulation - Google Patents
Stratum adaptability test method of shield with soil chamber simulation Download PDFInfo
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- CN104849429A CN104849429A CN201510233995.0A CN201510233995A CN104849429A CN 104849429 A CN104849429 A CN 104849429A CN 201510233995 A CN201510233995 A CN 201510233995A CN 104849429 A CN104849429 A CN 104849429A
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Abstract
The invention provides a stratum adaptability test method of shield with a soil chamber simulation. The test method comprises the following steps that the soil chamber is connected with the front end of a barrel-type soil box, and a baffle plate is packaged at the rear end of the barrel-type soil box, moreover, a cutter and a counter-force ejector plate, which can advance and retreat along the axial direction, are respectively arranged at the front end and the rear end inside the soil box, and the cutter and the ejector plate jointly form a stratum cutting test space; prepared remoulded soil is added into the soil box through a soil inlet on the soil box; a counter-force oil cylinder is started to drive the counter-force ejector plate to push soil body, so as to set the soil pressure to a required value; the cutter is driven to rotate, advance and cut the soil body through a transmission shaft; the soil body cut by the cutter enters into the soil chamber, and the soil pressure and the pore water pressure in the soil chamber are measured, and additives are added into the soil box to improve the soil body during the cutting process; after the cutting, a soil outlet of the soil box is opened, and the flowability of the improved soil body is measured. The method provided by the invention has the advantage that parameters obtained by real-time monitoring are comprehensive and high in accuracy, and can be used for evaluating stratum adaptability of shield.
Description
Technical field
The invention belongs to shield structure formation testing technical field, be specifically related to a kind of ground adaptability method of testing with the simulation of native cabin.
Background technology
Shield method has been widely used in building of the city underground of China or river-crossing tunnel as a kind of comparatively ripe subway work means.Along with the complexity day by day of excavation ground layer soil body, soil mass property is also increasing for the impact of shield driving, such as, when tunneling in hard plastic clay stratum, because plasticity and fluidity of soil is poor, the soil body cannot be discharged in time in native cabin, often there will be shield structure thrust, the abnormal increase of cutter head torque, the phenomenons such as fltting speed is slow; When tunneling in the higher sandy soil stratum of quartz content or the larger sand-pebble layer of particle diameter, cutter and cutterhead serious wear, fltting speed slows down even to need to shut down and changes cutter.Therefore need to treat excavation soil layer in advance and carry out adaptive testing, detect every operational factor of cutterhead and cutter in shield structure working angles and be adjusted accordingly, normally tunneling in the earth formation to enable shield structure.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of shield structure ground adaptability method of testing with the simulation of native cabin is provided, this method of testing is by arranging cutterhead and counter-force top board formation soil layer cutting test space at native case two ends, and by being arranged at the every operational factor in each sensor Real-Time Monitoring tester working angles on tester, thus provide good reference for shield model selection, shield driving and soil improvement method.
The object of the invention realizes being completed by following technical scheme:
A kind of shield structure ground adaptability method of testing with the simulation of native cabin, it is characterized in that described method of testing comprises the steps: to connect native cabin, rear end encapsulation dividing plate in the front end of a tubular soil case, and the cutterhead and counter-force top board that can retreat vertically are set respectively at the forward and backward two ends of described native case inside, space between described cutterhead and described counter-force top board forms soil layer cutting test space jointly, described cutterhead is driven by the transmission shaft running through native cabin end face described in this end and rotates, and described counter-force top board is by the counter-force oil cylinder pushing tow running through dividing plate described in this end; The manipulated soil prepared adds in described soil layer cutting test space by the Tu Kou that enters on described native case; Start counter-force Roof soil-shifting body described in described counter-force hydraulic oil cylinder driving so that soil pressure in described native case is set to desirable value; Start adjustable frequency motor and jacking oil cylinder and drive described cutterhead to rotate through described transmission shaft and advance and cut the soil body, the soil body after described knife cutting to enter in described native cabin and the soil pressure measured in described native cabin and pore water pressure, adds adjuvant to improve the soil body in working angles in described native case; After cutting completes, open the soil outlet of described native case, record the weight that in the set time, the improvement soil body flows out, to measure the mobility of the rear soil body of improvement.
Described cutterhead back is provided with soil pressure sensor and pore water pressure sensor, and described soil pressure sensor and pore water pressure sensor detect soil pressure in described native cabin and pore water pressure and uploading data in real time.
Described counter-force top board is provided with soil pressure sensor and pore water pressure sensor, and described soil pressure sensor and pore water pressure sensor detect soil pressure in described native case and pore water pressure and uploading data in real time.
Described adjustable frequency motor is provided with torque speed sensor to detect the moment of torsion of described adjustable frequency motor and rotating speed in real time and uploading data, described jacking oil cylinder is provided with top force-stroke sensor to detect the top power of described jacking oil cylinder, stroke and speed in real time and uploading data.
Described cutterhead is spoke wheel, is provided with strain rosette to detect cutterhead strain in real time and uploading data.
The described step measuring the rear soil body flow method of improvement is: arrange fluidity proving installation at the soil outlet of described native case, described fluidity testing device comprises LOAD CELLS and is positioned at the measuring cup in described LOAD CELLS, after cutting completes, open the soil outlet of described native case, in the described LOAD CELLS record set time, flow into the conditioned soil weight in described measuring cup.
Be provided with adjuvant ascending pipe in described transmission shaft, one end of described adjuvant ascending pipe is connected with the center pit of described cutterhead, and the other end is connected with outside soil improvement agent pumping installations.
Advantage of the present invention is, current existing proving installation mostly is model test, the device used in this method of testing is then testing tool, its soil layer condition that can test and buried depth in extensive range, the parameter that Real-Time Monitoring obtains is comprehensive and accuracy is high, can be used for the ground adaptability evaluating shield structure, thus provide good reference for shield model selection, shield driving and soil improvement method, be applicable to test EPB shield tunneling or slurry shield.
Accompanying drawing explanation
Fig. 1 is tester structural representation in the present invention;
Fig. 2 is native cabin schematic perspective view in the present invention;
Fig. 3 is native cabin schematic cross-section in the present invention;
Fig. 4 is native cabin front end face schematic diagram in the present invention;
Native cabin rear end face schematic diagram in the present invention of Fig. 5 position.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
As Fig. 1-5, mark 1-30 in figure to be respectively: counter-force oil cylinder 1, dividing plate 2, counter-force top board 3, soil case 4, cutterhead 5, soil cabin 6, transmission shaft 7, jacking oil cylinder 8, torque speed sensor 9, adjustable frequency motor 10, jacking support 11, adjuvant ascending pipe 12, universal wheel 13, base 14, jacking guiding trestle 15, measuring cup 16, LOAD CELLS 17, enter native mouth 18, soil outlet 19, pore water pressure sensor 20, soil pressure case 21, adjuvant filling orifice 22, cutter 23, center pit 24, spoke 25, panel 26, preformed hole 27, strain rosette 28, inner support 29, support arm 30.
Embodiment: the present embodiment is specifically related to a kind of shield structure ground adaptability method of testing with the simulation of native cabin, this method of testing by every operational factor of Real-Time Monitoring tester, thus provides good reference for shield model selection, shield driving and soil improvement method.
As Figure 1-5, the shield structure ground adaptability method of testing with the simulation of native cabin in the present embodiment specifically comprises the steps:
(1) shield structure ground adaptability tester is first built:
The main body of this tester is a native case 4 in tubular, its front end face is connected with native cabin 6, thereafter end face is then packaged with dividing plate 2, front end in native case 4 is provided with the cutterhead 5 that can retreat vertically, cutterhead 5 specifically drives rotation by the transmission shaft 7 that runs through center, native cabin 6, and the rear end in native case 4 is provided with the counter-force top board 3 that can retreat vertically, counter-force top board 3 is specifically driven by the counter-force oil cylinder 1 running through rear end face dividing plate 2 center; Aforesaid cutterhead 5 forms soil layer cutting test space jointly with counter-force top board 3 in native case 4;
The top of soil case 4 is provided with into native mouth 18, and bottom is provided with soil outlet 19, side wall surface then offers tempered glass view window for observation (attached not shown); Soil cabin 6 is the cylindrical cavities be connected with native case 4, the initial position of cutterhead 5 is in both intersections, soil pressure case 21 and pore water pressure sensor 20 is provided with at the back side of cutterhead 5, the end face in native cabin 6 is also provided with adjuvant filling orifice 22 and preformed hole 27, wherein preformed hole 27 can connect mud system for evaluating the ground adaptability problem of slurry shield, also can connect soil output and be unearthed situation for the soil output of testing under different additive condition; This external counter-force top board 3 is provided with soil pressure case 21 and pore water pressure sensor 20 equally; It should be noted that, outside native case 4, native cabin 6 is also added in the present embodiment, make like this device and actual shield machine more close, meanwhile can also simulate the soil body enter native cabin 6 after situation, in native cabin 6, measure its soil pressure in cabin and pore water pressure;
Transmission shaft 7 top is run through the center of native cabin 6 end face and is coaxially fixed with the center pit 24 of cutterhead 5, the end of transmission shaft 7 is connected the advance and retreat of power section and rotary power to be delivered on the cutterhead 5 that is attached thereto to drive cutterhead 5 with power section, be provided with along its axial arranged adjuvant ascending pipe 12 in transmission shaft 7, the top of adjuvant ascending pipe 12 is connected with the center pit 24 of cutterhead 5, end is connected with outside soil improvement agent pumping installations, to inject adjuvant to the soil body in pressurized capsule; Power section mainly comprises adjustable frequency motor 10, torque speed sensor 9 and jacking oil cylinder 8, adjustable frequency motor 10 provides rotary power through transmission shaft 7 to cutterhead 5, and the rotating speed by regulating different frequencies to regulate adjustable frequency motor 10, measured moment of torsion and the rotating speed of motor by torque speed sensor 14 simultaneously, the power that jacking oil cylinder 8 provides cutterhead 5 to tunnel and retreat, and by thrust bearing to front transfer, wherein, transmission shaft 7 supports through jacking guiding trestle 15, and adjustable frequency motor 10 supports through jacking support 11;
Cutterhead 5 forms primarily of spoke 25, cutter 23, panel 26, inner support 29, support arm 30 and strain rosette 28, the aperture opening ratio of cutterhead 5 can be adjusted by the size changing six pieces of panels 26 during work, by pasting the strain that strain rosette 28 measures cutterhead 5 at the back of spoke 25, simultaneously by measuring the change of cutter 23 quality to measure its abrasion condition;
Counter-force oil cylinder 1 runs through the center pit of rear end face dividing plate 2 and coaxially fixes with counter-force top board 3, and counter-force top board 3 drives its jacking or retrogressing by counter-force oil cylinder 1;
Fluidity testing device is provided with below the soil outlet 19 of native case 4, this fluidity testing device comprises measuring cup 16 and LOAD CELLS 17, measuring cup 16 is arranged in LOAD CELLS 17, after cutterhead 5 cuts a segment distance, open soil outlet 19, record the weight that in the set time, the improvement soil body flows out, measure the mobility of the rear soil body of improvement with this;
Above-mentioned all parts are all mounted on base 14, and have universal wheel 13 bottom base 14, and tester carries out free traveling by universal wheel 13;
(2) manipulated soil prepared adds in aforesaid soil layer cutting test space by the native mouth 18 that enters on native case 4;
(3) counter-force oil cylinder 1 is started to drive the counter-force top board 3 pushing tow soil body, soil pressure in native case 4 is made to be adjusted to desirable value by pushing tow, while pushing tow, by the soil pressure in the soil pressure case 21 on counter-force top board 3 and the native case 4 of the real-time detection of pore water pressure sensor 20 and pore water pressure and by these two kinds of data upload;
(4) adjustable frequency motor 10 and jacking oil cylinder 8 is started, advance so that rotation and jacking power to be passed on cutterhead 5 by transmission shaft 7 and to be driven it to rotate to cut the soil body, in the process of cutting, by torque speed sensor 9 that adjustable frequency motor 10 is arranged to detect the moment of torsion of adjustable frequency motor 10 and rotating speed in real time and uploading data; Simultaneously by top force-stroke sensor set on jacking oil cylinder 8 to detect the top power of jacking oil cylinder 8, stroke and speed in real time and uploading data; In addition by strain rosette 28 set on cutterhead 5 to detect the strain of cutterhead 5 in real time and uploading data;
(5), in working angles, start adjuvant injected system and inject adjuvant to improve the soil body in the soil body in native case 4, namely realized by adjuvant ascending pipe 12 and adjuvant filling orifice 22; In addition, in working angles, the soil body cuts through cutterhead 5 and laggardly buries in cabin 6, in native cabin 6, detect its cabin pore water pressure and soil pressure by the pore water pressure sensor 20 at cutterhead 5 back side and soil pressure case 21, by make after adding native cabin 6 tester and actual shield machine more close;
(6) open the soil outlet 19 of native case 4 after having cut, LOAD CELLS 17 records in the set time conditioned soil weight flowed in measuring cup 16, to measure the mobility of the rear soil body of improvement;
(7) obtained every data are carried out comprehensive analyzing evaluation, thus provide good reference for shield model selection, shield driving and soil improvement method.
The advantage of the present embodiment is, this method of testing can carry out ground adaptability test for different stratum, different buried depths; More construction parameter can be tested; Meanwhile this method of testing both can before engineering go into operation, first carry out trial test, auxiliary shield model selection, again can in construction process, directly proving installation is placed on shield structure vehicle frame, real-time inspection shield structure is unearthed improvement situation, feeds back shield structure driver adjust current construction parameter with this; Meanwhile, on the end face of native cabin, reserved two holes, can connect mud system for evaluating the ground adaptability problem of slurry shield;
In addition, current existing proving installation mostly is model test, and proving installation used in this method of testing is testing tool, its standardization level and application degree higher; The soil layer condition that can test and buried depth scope more extensive; The parameter that can measure is meticulousr more comprehensively; Not only EPB shield tunneling can be tested but also slurry shield can be tested; Both may be used for shield model selection in early stage, and may be used for again construction in later period and detect feedback in real time; Both may be used for shop experiment, may be used for site test again.
This method of testing can assist us, and shield model selection is more appropriate in earlier stage, shield tunnelling parameters is more suitable, soil improvement method is more effective, assisting us to avoid risk in advance, having outstanding effect to improving shield-tunneling construction.
Claims (7)
1. the shield structure ground adaptability method of testing with the simulation of native cabin, it is characterized in that described method of testing comprises the steps: to connect native cabin, rear end encapsulation dividing plate in the front end of a tubular soil case, and the cutterhead and counter-force top board that can retreat vertically are set respectively at the forward and backward two ends of described native case inside, space between described cutterhead and described counter-force top board forms soil layer cutting test space jointly, described cutterhead is driven by the transmission shaft running through native cabin end face described in this end and rotates, and described counter-force top board is by the counter-force oil cylinder pushing tow running through dividing plate described in this end; The manipulated soil prepared adds in described soil layer cutting test space by the Tu Kou that enters on described native case; Start counter-force Roof soil-shifting body described in described counter-force hydraulic oil cylinder driving so that soil pressure in described native case is set to desirable value; Start adjustable frequency motor and jacking oil cylinder and drive described cutterhead to rotate through described transmission shaft and advance and cut the soil body, the soil body after described knife cutting to enter in described native cabin and the soil pressure measured in described native cabin and pore water pressure, adds adjuvant to improve the soil body in working angles in described native case; After cutting completes, open the soil outlet of described native case, record the weight that in the set time, the improvement soil body flows out, to measure the mobility of the rear soil body of improvement.
2. a kind of shield structure ground adaptability method of testing with the simulation of native cabin according to claim 1, it is characterized in that described cutterhead back is provided with soil pressure sensor and pore water pressure sensor, described soil pressure sensor and pore water pressure sensor detect soil pressure in described native cabin and pore water pressure and uploading data in real time.
3. a kind of shield structure ground adaptability method of testing with the simulation of native cabin according to claim 1, it is characterized in that described counter-force top board is provided with soil pressure sensor and pore water pressure sensor, described soil pressure sensor and pore water pressure sensor detect soil pressure in described native case and pore water pressure and uploading data in real time.
4. a kind of shield structure ground adaptability method of testing with the simulation of native cabin according to claim 1, it is characterized in that described adjustable frequency motor is provided with torque speed sensor to detect the moment of torsion of described adjustable frequency motor and rotating speed in real time and uploading data, described jacking oil cylinder is provided with top force-stroke sensor to detect the top power of described jacking oil cylinder, stroke and speed in real time and uploading data.
5. a kind of shield structure ground adaptability method of testing with the simulation of native cabin according to claim 1, is characterized in that described cutterhead is spoke wheel, is provided with strain rosette to detect cutterhead strain in real time and uploading data.
6. a kind of shield structure ground adaptability method of testing with the simulation of native cabin according to claim 1, it is characterized in that the described step measuring the rear soil body flow method of improvement is: fluidity proving installation is set at the soil outlet of described native case, described fluidity testing device comprises LOAD CELLS and is positioned at the measuring cup in described LOAD CELLS, after cutting completes, open the soil outlet of described native case, in the described LOAD CELLS record set time, flow into the conditioned soil weight in described measuring cup.
7. a kind of shield structure ground adaptability method of testing with the simulation of native cabin according to claim 1, it is characterized in that being provided with adjuvant ascending pipe in described transmission shaft, one end of described adjuvant ascending pipe is connected with the center pit of described cutterhead, and the other end is connected with outside soil improvement agent pumping installations.
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| CN201510233995.0A CN104849429B (en) | 2015-05-08 | 2015-05-08 | With the shield structure ground adaptability method of testing of native cabin simulation |
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| CN201510233995.0A CN104849429B (en) | 2015-05-08 | 2015-05-08 | With the shield structure ground adaptability method of testing of native cabin simulation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442941A (en) * | 2016-11-11 | 2017-02-22 | 浙江科技学院（浙江中德科技促进中心） | Testing apparatus and method for shield crossing liquefiable top and hard bottom stratum |
| CN108168808A (en) * | 2017-12-22 | 2018-06-15 | 武汉大学 | A kind of shield cutter wear test model cutterhead of adjustable structure |
| CN108266199A (en) * | 2018-02-06 | 2018-07-10 | 西南交通大学 | A kind of experimental rig and method for the simulation of earth pressure balanced shield, EPBS cutterhead mud lining |
| CN108417131A (en) * | 2018-03-13 | 2018-08-17 | 中铁隧道局集团有限公司 | A kind of balancing earth-pressure shielding machine identification of formation technical research experimental provision |
| CN111058854A (en) * | 2019-12-10 | 2020-04-24 | 中铁十四局集团隧道工程有限公司 | Shield constructs cutter head and shield and constructs machine |
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