CN204919633U - Limited soil body rigidity barricade soil pressure model test device - Google Patents
Limited soil body rigidity barricade soil pressure model test device Download PDFInfo
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- CN204919633U CN204919633U CN201520593350.3U CN201520593350U CN204919633U CN 204919633 U CN204919633 U CN 204919633U CN 201520593350 U CN201520593350 U CN 201520593350U CN 204919633 U CN204919633 U CN 204919633U
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Abstract
The utility model discloses a limited soil body rigidity barricade soil pressure model test device. The device includes mold box, loading system, retaining wall and the system of measurationing. The mold box side builds in toughened glass, welding rigidity cushion on the mold box bottom plate, and the loading side sets up the reaction frame, eight group's screens steel blooms of welding on the frame, but the loading system of two sets of autonomous workings of installation on the reaction frame is connected with the removal barricade through the fixed hinge support, the fixed boundary is installed on the appointed screens steel bloom according to the width needs that banket, miniature soil pressure cell has been buried on the retaining wall underground, remove the barricade rear and install the percentage table, mold box side dead ahead is arranged in to digital camera. Simulation difference banket width, wall soil contact surface, barricade displacement and the mode of shifting, land movement field and slip face are pursue in monitoring initiative or passive earth pressure's change. The utility model discloses can provide effectual experimental data support for the soil pressure problem research under the limited soil body condition to the theoretical analysis model is offered help after to.
Description
Technical field
The utility model relates to soil pressure calculation device in a kind of geotechnical engineering, particularly relate to the Earth Pressure Models experimental rig under the finite soil rigid retaining walls of change width of banketing, to can be used for measuring under different wall movement mode, different lateral diaphragm wall displacement initiatively or passive earth pressure problem.
Background technology
At geotechnological retaining wall, as in the engineering structures such as foundation pit enclosure structure, pier footing and pile foundation support table, initiatively or passive earth pressure problem most important.After classical coulomb or Rankine's earth pressure theory all suppose barricade, the soil body is semi-infinite body; and under actual conditions; often have the barricade or bedrock surface existence that close on; and the ratio of the hierarchy structure of the soil body is often less between barricade; active region or the passive area soil body no longer meet the supposition of semi-infinite body, now should consider the impact of soil body width and adjacent barricade.Therefore under the different widths affect that bankets, the Earth pressures acted on rigid retaining wall is problem in the urgent need to address.
Lot of experiments research shows that soil pressure has much relations along barricade depth profile and wall movement mode and lateral diaphragm wall displacement.In Practical Project, the wall movement mode of rigid retaining walls also has the pattern of rotation and passing-flow resistance at the bottom of wall except the most basic translation mode.Different wall movement mode has a great impact the size of soil pressure and distribution.In addition in Practical Project, often lateral diaphragm wall displacement does not reach capacity displacement, now initiatively the soil pressure of the soil body is larger than ultimate limit state active earth pressure, and the soil pressure of the passive soil body is less than ultimate limit state passive earth pressure, the active therefore under research non-limit state or passive earth pressure particularly important.This just needs the accurate control to barricade wall movement mode and lateral diaphragm wall displacement amount, needs to adopt to want high-precision loading system and measurement system to realize.Traditional way adopts hydraulic jack controlled loading, but hydraulic jack not easily ties up lotus for a long time, and easily in loading, load constantly reduces; And the uninstall process of jack is difficult to fine control, for the more difficult realization of active earth pressure under the different wall movement mode of accurate measurement, different displacement.Meanwhile, in process of the test, need slowly to promote the friction that barricade could reduce between barricade and sidewall, this just need one can the loading system of accurate slow controlled loading speed.
In current engineering, under normal supposition plane strain condition, the slip-crack surface of active and passive soil pressure is the plane horizontal by certain angle of being called in person by wall, but owing to closing on the existence of barricade, the slip-crack surface under the different width that bankets is inevitable different from the coulomb of classics or the slip-crack surface of Rankine's earth pressure theory.Dyed yarn line determination slip-crack surface position is adopted in traditional soil pressure calculation, but cannot learn for the distribution of the displacement field of the whole soil body, and slip-crack surface needs larger lateral diaphragm wall displacement just may with the naked eye identify, in real work, unconfinedly can not carry out barricade and move.This just needs a kind of non-meat outlook not and accurately carries out the technology of whole land movement field analysis.
Theory analysis is all based upon on certain analytical model basis simultaneously, if real slip-crack surface cannot be learnt, correct theory analysis cannot be carried out, and field measurement is difficult to obtain slip-crack surface and active and passive soil pressure, therefore needs model testing to carry out clear and definite difference and to banket the relation of the slip-crack surface of the active and passive soil pressure under width and active and passive soil pressure and banket width, barricade wall movement mode and lateral diaphragm wall displacement.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the utility model provides finite soil rigid retaining walls Earth Pressure Models experimental rig, solve and effectively accurately control lateral diaphragm wall displacement, wall movement mode, and measure active or the passive earth pressure of different depth scope under each state, and determine the problem such as soil deformation and the slip-crack surface rule of development.
The utility model solves the technical scheme that its technical problem adopts: the utility model finite soil rigid retaining walls Earth Pressure Models experimental rig, comprises model casing, loading system, retaining wall and measurement system four parts; Described model casing is made up of model casing base, model casing base plate, model casing framework, tempered glass, screens bloom, loading system reaction frame and stiffness bearer; Described model casing base is welded by i iron; Described model casing base plate is welded on model casing base by corrosion resistant plate surrounding; Described model casing framework is welded by stainless steel strip, and is welded on model casing base and model casing base plate, slots in the stainless steel strip of side; Described tempered glass passes through silica gel build-in in the line of rabbet joint of the stainless steel strip of side; Described screens bloom is welded on model casing base plate and model casing framework; The section of described loading system reaction frame is trapezoidal, is formed, and be welded on model casing base by two pieces of trapezoidal steel plate, three horizontal steel bars and reaction frame Plate Weldings; Described stiffness bearer is grooved cushion block, is welded on model casing base plate, and a round bar is respectively welded in both sides thereon; Described loading system is by totally two overlapping the equipment that can work independently and form up and down, every complete equipment is made up of three-phase frequency-conversion speed-regulation motor, reductor, screw lift and frequency converter, screw lift is fixed on reaction frame steel plate, and reductor is fixedly connected with screw lift, three-phase frequency-conversion speed-regulation motor respectively; Described screw lift comprises main body and screw mandrel; Described retaining wall comprises mobile barricade and fixed boundary two pieces of rigid retaining walls; Described mobile barricade is fixedly connected sequentially to right side on the left of model equipment by mobile Retaining Wall Reinforcement rib, mobile barricade aluminium alloy plate and mobile barricade nylon sheet, mobile barricade is connected to loading system by fixed-hinged support, and two sides each Self-adhesive fur window brush bar of mobile barricade also smears vaseline; Described fixed boundary is fixedly connected sequentially to right side on the left of model equipment by fixed boundary nylon sheet, fixed boundary aluminium alloy plate, fixed boundary reinforcing rib and moving handle, the fixed boundary aluminium alloy plate of fixed boundary just near four screens blooms at corner place, two sides each Self-adhesive fur window brush bar of fixed boundary; Described mobile barricade nylon sheet, fixed boundary nylon sheet according to the size of miniature earth pressure cell pre-borehole hole and with mobile barricade aluminium alloy plate, the grooving of fixed boundary aluminium alloy plate contact surface side; Described fixed-hinged support is made up of hinged-support base, hinged-support rotating hinge, hinged-support latch and steel bushing; Described hinged-support base is welded by one block of bottom level steel plate and two blocks of vertical steel plates, can just place hinged-support rotating hinge between two blocks of vertical steel plates, and forms the hole needed for hinged-support latch by borehole; Described hinged-support rotating hinge top annular, bottom thread shape; Described hinged-support latch is the steel cylinder of inner tapping, outside polishing, is fixed in the reserving hole of hinged-support latch by spring steel screw; Described steel bushing is the round steel cylinder of inner tapping, by screw mandrel and hinged-support rotating hinge assembly and connection; Described measurement system comprises miniature earth pressure cell, dial gage and digital camera; Described miniature earth pressure cell 16 altogether, be divided into two groups, center line respectively along mobile barricade and fixed boundary is embedded in measure the soil pressure force value in each depth bounds in hole reserved on retaining wall, and miniature earth pressure cell signal transmssion line is drawn by the line of rabbet joint in mobile barricade nylon sheet, fixed boundary nylon sheet; Described dial gage utilizes dial gage Magnetic gauge stand to fix, the expansion link of dial gage withstands on mobile barricade, and dial gage is used for the measurement of mobile lateral diaphragm wall displacement, arranges altogether three measuring points, be arranged in the center same level with screw mandrel, wherein two are arranged in the left and right sides of the screw mandrel of downside; Described dial gage Magnetic gauge stand is the formula magnetic stand that is coupling, and by the magnetic of magnetization and demagnetization switch control rule gauge stand, on gauge stand, each axle can be locked at an arbitrary position; Described digital camera is positioned over dead ahead, model casing side and carries out BR to the soil body, utilizes the photo of shooting to carry out particle image velocimetry technology (PIV) analysis to the soil body, thus draws the displacement field of the soil body.
Further, described screens bloom arranges eight groups altogether, and barricade spacing is divided into eight roads, is respectively 0.2,0.4,0.6,0.8,1.0,1.5,2.0 and 2.5 times of depth of fill.
Further, described loading system adopts the rotating speed of Frequency Converter Control three-phase frequency-conversion speed-regulation motor, and reduces rotating speed by reductor, and the rising or falling speed of controlled throwing bar is 0.026-0.125mm/s.
Further, described three-phase frequency-conversion speed-regulation motor regulates its rotating speed and forward/reverse by frequency converter; The speed ratio of described reductor is 1:100; The effective travel 200mm of the screw mandrel of described screw lift, screw mandrel can only translation and can not rotating in horizontal plane, the termination of screw mandrel is processed into thread-shaped simultaneously, is connected with fixed-hinged support.
Further, along the smooth and easy movement of the little steel bar energy of thin circle of two on stiffness bearer, and can there is not vertical displacement and only can rotate in perpendicular in described mobile barricade.
Further, the surface of described mobile barricade nylon sheet and fixed boundary nylon sheet can realize the simulation of different wall soil contact face degree of roughness by different disposal, by uniformly smear vaseline and covered with plastic film to simulate smooth surface of wall, by surface mount adhesive tape to simulate half coarse surface of wall, by surface mount coarse sandpaper to simulate coarse surface of wall.
Further, the thickness of described miniature earth pressure cell is equal with the thickness of mobile barricade nylon sheet, fixed boundary nylon sheet, and its signal transmssion line is drawn by the wire casing in retaining wall, is connected on data collecting instrument and miniature earth pressure cell electric supply installation.
Compared with prior art, the beneficial effects of the utility model are:
1, outside mobile barricade, arrange in the utility model that two overlap be made up of three-phase frequency-conversion speed-regulation motor, reductor and screw lift charger to realize horizontal addload, and respectively by the speed of two Frequency Converter Control bunchers to realize different loading velocities, its scope is 0.026-0.125mm/s, thus effectively can control loading velocity and the wall movement mode of barricade.And this charger regulates the rotation direction of buncher by frequency converter and then controls the lifting of leading screw, controls retrogressing or the advance of barricade, thus realizes main passive earth pressure problem.Which solves when utilizing jack to load, not easily tie up lotus for a long time, easily load constantly reduces in loading, uninstall process is difficult to control very well and the problem such as precision of displacement.
2, in the utility model, earth pressure cell is embedded in nylon sheet (thickness of slab and earth pressure cell consistency of thickness), earth pressure cell signal transmssion line is also embedded in the line of rabbet joint at the nylon sheet back side simultaneously, then nylon plastic(s) plate is screwed on aluminium alloy plate.Such process one is the surfacing that can ensure barricade, avoids surface irregularity and the stress concentration phenomenon occurred; Two is the absolute rigidities that can ensure the earth pressure cell back side; Three is concrete walls of more traditional use, and under same rigidity, thickness can reduce, and is beneficial to reducing of test model, and wall surface is nylon sheet is convenient to paste sand paper, adhesive tape etc. to be processed into different roughness.
3, the utility model buries earth pressure cell underground too on fixed boundary (closing on barricade), under measuring different wall movement mode, different lateral diaphragm wall displacement, close on the soil pressure size on barricade and distribution, thus theoretical analysis model is afterwards offered help.
Accompanying drawing explanation
Fig. 1 is finite soil rigid retaining walls Earth Pressure Models experimental rig lateral view;
Fig. 2 is finite soil rigid retaining walls Earth Pressure Models experimental rig top view;
In Fig. 3, (a) is mobile barricade top retaining wall structure chart, and (b) is that mobile barricade back reinforces figure, and (c) buries figure underground for mobile Earth Pressure of Retaining Wall box;
In Fig. 4, (a) is fixed boundary top retaining wall structure chart, and (b) is that fixed boundary back reinforces figure, and (c) buries figure underground for fixed boundary earth pressure cell;
Fig. 5 is that charger assembles and arrangement diagram;
Fig. 6 is that fixed-hinged support is linked and packed figure, and (a) is A-A sectional view, and (b) is B-B sectional view;
In figure: model casing base 1; Model casing base plate 2; Model casing framework 3; Tempered glass 4; Screens bloom 5; Loading system reaction frame 6; Reaction frame steel plate 6-1; Three-phase frequency-conversion speed-regulation motor 7; Reductor 8; Screw lift 9; Screw mandrel 9-1; Frequency converter 10; Mobile barricade 11; Mobile barricade aluminium alloy plate 11-1; Mobile barricade nylon sheet 11-2; Mobile Retaining Wall Reinforcement rib 11-3; Fixed boundary 12; Fixed boundary aluminium alloy plate 12-1; Fixed boundary nylon sheet 12-2; Fixed boundary reinforcing rib 12-3; Stiffness bearer 13; Miniature earth pressure cell 14; Test soil 15; Moving handle 16; Fixed-hinged support 17; Hinged-support base 17-1; Hinged-support rotating hinge 17-2; Hinged-support latch 17-3; Steel bushing 17-4; Dial gage 18; Dial gage Magnetic gauge stand 19; Fur window brush bar 20.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As shown in Figure 1 and Figure 2, the utility model finite soil rigid retaining walls Earth Pressure Models experimental rig, comprises model casing, loading system, retaining wall and measurement system four parts.
Described model casing, is made up of model casing base 1, model casing base plate 2, model casing framework 3, tempered glass 4, screens bloom 5, loading system reaction frame 6 and stiffness bearer 13; Described model casing base 1 is welded by 10# i iron, and one is bear upper load as the base of model casing and pass to the ground at model casing place, and two is locate and fix upper component; Described model casing base plate 2 is welded on model casing base 1 by the thick corrosion resistant plate surrounding of 3mm, bear the load of retaining wall and test soil 15, another surface is done as far as possible coarse, between guarantee test soil 15 and model casing base plate 2, there is enough frictions, avoid sliding between the soil body and model casing base plate 2; Described model casing framework 3 is welded by high-strength stainless steel bar, and is welded on model casing base 1 and model casing base plate 2, slots in the stainless steel strip of side; Described tempered glass 4 is that 20mm is thick, by silica gel build-in in the line of rabbet joint of the stainless steel strip of side; Described screens bloom 5 is the stainless steel bloom of 5mm (length) × 4mm (wide) × 3mm (height), be welded on model casing base plate 2 and model casing framework 3, it act as the position limiting fixed boundary, make the width banketed between barricade be setting value (0.2,0.4,0.6,0.8,1.0,1.5,2.0 and 2.5 times of depth of fill), what should ensure to weld is firm in prevent when measuring passive earth pressure because stressed excessive and screens bloom 5 is fixing loosely; The section of described loading system reaction frame 6 is trapezoidal, and be welded by two pieces of trapezoidal steel plate, three horizontal steel bars and reaction frame steel plate 6-1, and be welded on model casing base 1, it provides reliable counter-force as loading system; Described reaction frame steel plate 6-1 adopts 5mm steel plate to make, and it effectively can be fixed each device of loading system; Described stiffness bearer 13 adopts corrosion resistant plate to be folded into grooved cushion block, height is 10cm, and it is welded on model casing base plate 2, and a carefully little steel bar of circle is respectively welded in both sides thereon, and lubricated is carried out to it, thus reduce frictional force suffered when barricade moves above as far as possible.
Described loading system, by totally two overlapping the equipment that can work independently and form up and down, every complete equipment is made up of three-phase frequency-conversion speed-regulation motor 7, reductor 8, screw lift 9 and frequency converter 10, screw lift 9 is fixed on reaction frame steel plate 6-1 by four high-strength screws, screw lift 9 is fixedly connected with by four high-strength screws with reductor 8, reductor 8 is fixedly connected with by four high-strength screws with three-phase frequency-conversion speed-regulation motor 7, two cover chargers assemble and arrangement diagram as shown in Figure 5; The rated power of described three-phase frequency-conversion speed-regulation motor 7 is 3KW, rotating speed 2000r/min, and regulates its rotating speed and forward/reverse by frequency converter 10; The speed ratio of described reductor 8 is 1:100; Described screw lift 9 comprises main body and screw mandrel 9-1, the diameter 58mm of screw mandrel 9-1, effective travel 200mm, can meet needed for mobile barricade 11 displacement, screw mandrel 9-1 need be processed into can only translation and can not rotating in horizontal plane, the termination of screw mandrel 9-1 is processed into the screw thread of M18mm (diameter) × 1.5mm (flight pitch), so that be connected with fixed-hinged support 17 simultaneously; Described loading system can respectively by arranging the different value of frequency converter 10 thus the different translational speeds to left/right of change screw mandrel 9-1, thus realize the different translational speed of barricade and different wall movement mode, also rotation/the stopping of motor is controlled by the shift knob on frequency converter, and then the movement of screw mandrel 9-1 and mobile barricade 11/static.Described loading system adopts frequency converter 10 to control the lower rotating speed of three-phase frequency-conversion speed-regulation motor 7, and pass through the larger speed ratio of reductor 8, make native system can have slower loading velocity and larger loading force, the rising or falling speed of controlled throwing bar 9-1 is 0.026-0.125mm/s, control if show after deliberation can effectively reduce frictional force between mobile barricade 11 and model casing sidewall when the translational speed of mobile barricade 11 is lower, also can accurately control the displacement of mobile barricade 11 and wall movement mode simultaneously.
As shown in Figure 3, Figure 4, described retaining wall, comprises mobile barricade 11 and fixed boundary 12 two pieces of rigid retaining walls, described mobile barricade 11, by mobile barricade aluminium alloy plate 11-1, mobile barricade nylon sheet 11-2 and mobile Retaining Wall Reinforcement rib 11-3 forms, it is screwed connection, its back side is screwed hinged-support base 17-1, mobile barricade 11 is connected to loading system by fixed-hinged support 17, two sides each Self-adhesive fur window brush bar 20 of mobile barricade 11 also smears vaseline, with the sealing gap between the tempered glass of the front and back to itself and model casing and lubrication, mobile barricade 11 is along the smooth and easy movement of the little steel bar energy of thin circle of two on stiffness bearer 13, described fixed boundary 12, be made up of fixed boundary aluminium alloy plate 12-1, fixed boundary nylon sheet 12-2, fixed boundary reinforcing rib 12-3 and moving handle 16, be screwed connection, fixed boundary aluminium alloy plate 12-1 on fixed boundary 12 is just near four screens blooms 5 at corner place, two sides each Self-adhesive fur window brush bar 20 of fixed boundary 12, with the sealing gap between the tempered glass of the front and back to itself and model casing.Described mobile barricade nylon sheet 11-2, fixed boundary nylon sheet 12-2 according to miniature earth pressure cell 14 size pre-borehole hole and reserving the position of miniature earth pressure cell 14 signal transmssion line with mobile barricade aluminium alloy plate 11-1, the grooving of fixed boundary aluminium alloy plate 12-1 contact surface side, each retaining wall all arranges eight miniature earth pressure cells 14 to measure the soil pressure force value in each depth bounds banketing in depth bounds along retaining wall center line both sides, the layout of miniature earth pressure cell 14 as shown in Figure 3,4; The surface of described mobile barricade nylon sheet 11-2, fixed boundary nylon sheet 12-2 can realize the simulation of different wall soil contact face degree of roughness by different disposal, by uniformly smear the certain thickness vaseline of one deck and covered with plastic film to simulate smooth surface of wall, by surface mount adhesive tape to simulate half coarse surface of wall, by surface mount coarse sandpaper to simulate coarse surface of wall.The arrangement form of described mobile Retaining Wall Reinforcement rib 11-3 and fixed boundary reinforcing rib 12-3 as shown in Figure 3,4; Described fixed-hinged support 17, be made up of hinged-support base 17-1, hinged-support rotating hinge 17-2, hinged-support latch 17-3 and steel bushing 17-4, it act as the screw mandrel 9-1 and mobile barricade 11 that connect loading system, and make mobile barricade 11 vertical displacement not occur and only can rotate in perpendicular, it is linked and packed figure as shown in Figure 6; Described hinged-support base 17-1 adopts and is welded by one block of bottom level steel plate and two blocks of vertical steel plates, just can place hinged-support rotating hinge 17-2 between two blocks of vertical steel plates, and borehole forms the hole needed for hinged-support latch 17-3; Described hinged-support rotating hinge 17-2 is top annular, bottom is M18mm (diameter) × screw thread of 1.5mm (flight pitch); Described hinged-support latch 17-3 is the stainless steel steel cylinder of inner tapping, outside polishing, is fixed in the reserving hole of hinged-support latch 17-3 by spring steel screw; Described steel bushing 17-4 is the round steel cylinder that inner tapping forms the screw thread of M18mm (diameter) × 1.5mm (flight pitch), and it act as connection wire rod 9-1 and hinged-support rotating hinge 17-2.
Described measurement system comprises miniature earth pressure cell 14, dial gage 18 and digital camera, described miniature earth pressure cell 14 is (for passive earth pressure problem, active earth pressure problem range should reduce), range is 200kPa, be of a size of Ф 30mm (diameter) × 16mm (thickness), precision is 0.25%, 16 altogether, be divided into two groups, center line respectively along mobile barricade 11 and fixed boundary 12 is embedded in hole reserved on retaining wall to measure the soil pressure force value in each depth bounds, the thickness of miniature earth pressure cell 14 just moves barricade nylon sheet 11-2, the thickness of fixed boundary 12-2 nylon sheet is equal, miniature earth pressure cell 14 signal transmssion line is by mobile barricade nylon sheet 11-2, the line of rabbet joint on fixed boundary nylon sheet 12-2 is drawn, be connected on data collecting instrument and miniature earth pressure cell 14 electric supply installation, such process also ensure that earth pressure cell surface flushes with retaining wall surface, thus avoid stress to concentrate, described dial gage 18, range is 50mm, precision is 0.01mm, for the measurement of mobile barricade 11 displacement, dial gage Magnetic gauge stand 19 is utilized to fix, the expansion link of dial gage 18 withstands on mobile barricade 11, along with the loading of loading system, retaining wall conjugates, dial gage just can synchronously measure retaining wall displacement, for accurately controlling displacement and the wall movement mode of mobile barricade 11, three measuring points are set altogether, be arranged in the center same level with screw mandrel 9-1, wherein 2 are arranged in the left and right sides of the screw mandrel 9-1 of downside, check when mobile barricade 11 moves and whether off normal occurs, described dial gage Magnetic gauge stand 19 is the formula magnetic stand that is coupling, by magnetization and demagnetization switch control rule gauge stand magnetic thus be adsorbed on reaction frame steel plate 6-1, on gauge stand, each axle can be locked at an arbitrary position, thus is convenient to the location of dial gage and fixing, described digital camera, is positioned over dead ahead, model casing side and carries out BR to the soil body, utilizes the photo of shooting to carry out particle image velocimetry technology (PIV) analysis to the soil body, thus draws the displacement field of the soil body.
The course of work of the present utility model is as follows: first certain process is carried out to realize different wall soil contact face in the surface of fixed boundary nylon sheet 12-2 on barricade nylon sheet 11-2 mobile on mobile barricade 11 and fixed boundary 12, miniature earth pressure cell 14 is embedded in mobile barricade nylon sheet 11-2 as requested, in fixed boundary nylon sheet 12-2 reserving hole, its signal transmssion line is by mobile barricade nylon sheet 11-2, the line of rabbet joint in fixed boundary nylon sheet 12-2 is drawn and is connected on data collecting instrument and miniature earth pressure cell 14 electric supply installation, then mobile barricade 11 and fixed boundary 12 are installed by screw Connecting groups, fur window brush bar 20 is pasted in the side of mobile barricade 11 and fixed boundary 12, mobile barricade 11 to be positioned in model casing on stiffness bearer 13, utilize hinged-support latch 17-3 that the screw mandrel 9-1 of mobile barricade 11 and loading system is connected into entirety, mobile barricade 11 side fur window brush bar 20 smears vaseline and covers last layer plastic sheeting, fixed boundary 12 is positioned over blend compounds band on the screens bloom 5 of specifying temporary fixed, thus the width that bankets between barricade is met draft requirement, utilize dial gage Magnetic gauge stand 19 to install three dial gages 18 by the position shown in Fig. 1,2, dial gage 18 gauge outfit withstands on mobile barricade 11 specified location, and adjustment makes dial gage 18 level and reading resets, the initial reading of miniature earth pressure cell 14 under utilizing data collecting instrument acquisition and recording atmospheric pressure, filling test soil 15, makes it highly reach test requirements document height and surface is floating, the reading of miniature earth pressure cell 14 under utilizing data collecting instrument acquisition and recording inactive state, leave standstill and start to carry out soil pressure calculation after 24 hours, digital camera is placed in model casing dead ahead, regulates camera parameter, digital camera interval 20s is set and automatically snaps a photo, connect the power supply of charger, the parameter of setting frequency converter 10 is to meet the barricade moving direction of test requirements document and speed and barricade displacement, start-up loading device makes the slowly movement of mobile barricade 11, and triggers digital camera simultaneously, mobile barricade 11 displacement is divided into the displacement that some levels are very little, the reading of observation dial gage 18, when mobile barricade 11 reaches each grade of displacement, stop charger, the reading of miniature earth pressure cell 14 under utilizing this grade of displacement of data collecting instrument acquisition and recording, after digital independent completes, the displacement of continuation next stage is moved, till the displacement reaching test requirements document, the reading of miniature earth pressure cell 14 and the photo of digital camera shooting under the displacements at different levels of ultimate analysis data collecting instrument acquisition and recording.
Test soil should adopt sand rain method to cast test soil sample according to sand, is carried out the compactness of Controlling model ground by the distance controlling sand shake-out device sieve aperture mesh sheet and surface, model place.
Frequency converter 10 is set to change the movement to left/right of screw mandrel 9-1 and mobile barricade 11, and then realizes the object measuring active/passive soil pressure; Control the position of fixed boundary 12 and then control the width that bankets of finite soil; Record the reading of miniature earth pressure cell 14 thus the soil pressure under drawing non-limit state; Control to arrange the different frequency of two frequency converters 10 respectively thus the different wall movement mode controlling mobile barricade 11.
By the reading of miniature earth pressure cell 14 under the displacements at different levels of analysis data collecting instrument acquisition and recording, and adopt earth pressure cell calibration curve to carry out pressure conversion, thus draw the distribution of the soil pressure under displacement at different levels along the degree of depth; Photo captured by being taken by logarithmic code camera carries out PIV graphical analysis, draws the displacement field of the soil body, thus learns real slip-crack surface place and can carry out rational theory analysis.
Claims (6)
1. a finite soil rigid retaining walls Earth Pressure Models experimental rig, is characterized in that, comprises model casing, loading system, retaining wall and measurement system four parts; Described model casing is made up of model casing base (1), model casing base plate (2), model casing framework (3), tempered glass (4), screens bloom (5), loading system reaction frame (6) and stiffness bearer (13); Described model casing base (1) is welded by i iron; Described model casing base plate (2) is welded on model casing base (1) by corrosion resistant plate surrounding; Described model casing framework (3) is welded by stainless steel strip, and is welded on model casing base (1) and model casing base plate (2), slots in the stainless steel strip of side; Described tempered glass (4) by silica gel build-in in the line of rabbet joint of the stainless steel strip of side; Described screens bloom (5) is welded on model casing base plate (2) and model casing framework (3); The section of described loading system reaction frame (6) is trapezoidal, is welded, and is welded on model casing base (1) by two blocks of trapezoidal steel plate, three horizontal steel bars and reaction frame steel plates (6-1); Described stiffness bearer (13) is grooved cushion block, is welded on model casing base plate (2), and a round bar is respectively welded in both sides thereon; Described loading system is by totally two overlapping the equipment that can work independently and form up and down, every complete equipment is made up of three-phase frequency-conversion speed-regulation motor (7), reductor (8), screw lift (9) and frequency converter (10), screw lift (9) is fixed on reaction frame steel plate (6-1), and reductor (8) is fixedly connected with screw lift (9), three-phase frequency-conversion speed-regulation motor (7) respectively; Described screw lift (9) comprises main body and screw mandrel (9-1); Described retaining wall comprises mobile barricade (11) and fixed boundary (12) two pieces of rigid retaining walls; Described mobile barricade (11) is fixedly connected sequentially to right side on the left of model equipment by mobile Retaining Wall Reinforcement rib (11-3), mobile barricade aluminium alloy plate (11-1) and mobile barricade nylon sheet (11-2), mobile barricade (11) is connected to loading system by fixed-hinged support (17), and vaseline is also smeared in the two sides each Self-adhesive fur window brush bar (20) of mobile barricade (11); Described fixed boundary (12) is fixedly connected sequentially to right side on the left of model equipment by fixed boundary nylon sheet (12-2), fixed boundary aluminium alloy plate (12-1), fixed boundary reinforcing rib (12-3) and moving handle (16), the fixed boundary aluminium alloy plate (12-1) of fixed boundary (12) just near four screens blooms (5) at corner place, the two sides each Self-adhesive fur window brush bar (20) of fixed boundary (12); Described mobile barricade nylon sheet (11-2), fixed boundary nylon sheet (12-2) according to miniature earth pressure cell (14) size pre-borehole hole and with mobile barricade aluminium alloy plate (11-1), the grooving of fixed boundary aluminium alloy plate (12-1) contact surface side; Described fixed-hinged support (17) is made up of hinged-support base (17-1), hinged-support rotating hinge (17-2), hinged-support latch (17-3) and steel bushing (17-4); Described hinged-support base (17-1) is welded by one block of bottom level steel plate and two blocks of vertical steel plates, just can place hinged-support rotating hinge (17-2) between two blocks of vertical steel plates, and form the hole needed for hinged-support latch (17-3) by borehole; Described hinged-support rotating hinge (17-2) top annular, bottom thread shape; Described hinged-support latch (17-3) is inner tapping, the steel cylinder of outside polishing, is fixed in the reserving hole of hinged-support latch (17-3) by spring steel screw; The round steel cylinder that described steel bushing (17-4) is inner tapping, by screw mandrel (9-1) and hinged-support rotating hinge (17-2) assembly and connection; Described measurement system comprises miniature earth pressure cell (14), dial gage (18) and digital camera; Described miniature earth pressure cell (14) 16 altogether, be divided into two groups, center line respectively along mobile barricade (11) and fixed boundary (12) is embedded in measure the soil pressure force value in each depth bounds in hole reserved on retaining wall, and miniature earth pressure cell (14) signal transmssion line is drawn by the line of rabbet joint in mobile barricade nylon sheet (11-2), fixed boundary nylon sheet (12-2); Described dial gage (18) utilizes dial gage Magnetic gauge stand (19) to fix, the expansion link of dial gage (18) withstands on mobile barricade (11), dial gage (18) is for the measurement of mobile barricade (11) displacement, three measuring points are set altogether, be arranged in in the center same level of screw mandrel (9-1), wherein two are arranged in the left and right sides of the screw mandrel (9-1) of downside; Described dial gage Magnetic gauge stand (19) is the formula magnetic stand that is coupling; Described digital camera is positioned over dead ahead, model casing side.
2. a kind of finite soil rigid retaining walls Earth Pressure Models experimental rig according to claim 1, it is characterized in that, described screens bloom (5) arranges eight groups altogether, barricade spacing is divided into eight roads, is respectively 0.2,0.4,0.6,0.8,1.0,1.5,2.0 and 2.5 times of depth of fill.
3. a kind of finite soil rigid retaining walls Earth Pressure Models experimental rig according to claim 1, it is characterized in that, described loading system adopts frequency converter (10) to control the rotating speed of three-phase frequency-conversion speed-regulation motor (7), and reducing rotating speed by reductor (8), the rising or falling speed of controlled throwing bar (9-1) is 0.026-0.125mm/s.
4. a kind of finite soil rigid retaining walls Earth Pressure Models experimental rig according to claim 3, it is characterized in that, described three-phase frequency-conversion speed-regulation motor (7) regulates its rotating speed and forward/reverse by frequency converter (10); The speed ratio of described reductor (8) is 1:100; The effective travel 200mm of the screw mandrel (9-1) of described screw lift (9), screw mandrel (9-1) can only translation and can not rotating in horizontal plane, the termination of screw mandrel (9-1) is processed into thread-shaped simultaneously, is connected with fixed-hinged support (17).
5. a kind of finite soil rigid retaining walls Earth Pressure Models experimental rig according to claim 1, it is characterized in that, the surface of described mobile barricade nylon sheet (11-2) and fixed boundary nylon sheet (12-2) can realize the simulation of different wall soil contact face degree of roughness by different disposal, by uniformly smear vaseline and covered with plastic film to simulate smooth surface of wall, by surface mount adhesive tape to simulate half coarse surface of wall, by surface mount coarse sandpaper to simulate coarse surface of wall.
6. a kind of finite soil rigid retaining walls Earth Pressure Models experimental rig according to claim 1, it is characterized in that, the thickness of described miniature earth pressure cell (14) is equal with the thickness of mobile barricade nylon sheet (11-2), fixed boundary nylon sheet (12-2), its signal transmssion line is drawn by the wire casing in retaining wall, is connected on data collecting instrument and miniature earth pressure cell (14) electric supply installation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105926685A (en) * | 2016-04-28 | 2016-09-07 | 中国科学院武汉岩土力学研究所 | Built-in retaining wall type earth pressure displacement effect test method |
| CN109060474A (en) * | 2018-08-08 | 2018-12-21 | 湖南理工学院 | The method of the vertical dynamic lower finite soil dynamic soil pressure research that overloads |
| CN110512660A (en) * | 2019-07-12 | 2019-11-29 | 同济大学 | A kind of simulation retaining wall in foundation pits displacement induces the experimental rig of soil deformation after wall |
| CN117949639A (en) * | 2024-03-27 | 2024-04-30 | 中铁二十三局集团第一工程有限公司 | Movable multipurpose retaining wall simulation test device and test method thereof |
-
2015
- 2015-08-03 CN CN201520593350.3U patent/CN204919633U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105926685A (en) * | 2016-04-28 | 2016-09-07 | 中国科学院武汉岩土力学研究所 | Built-in retaining wall type earth pressure displacement effect test method |
| CN105926685B (en) * | 2016-04-28 | 2017-12-22 | 中国科学院武汉岩土力学研究所 | Built-in retaining wall type soil pressure displacement effect test method |
| CN109060474A (en) * | 2018-08-08 | 2018-12-21 | 湖南理工学院 | The method of the vertical dynamic lower finite soil dynamic soil pressure research that overloads |
| CN110512660A (en) * | 2019-07-12 | 2019-11-29 | 同济大学 | A kind of simulation retaining wall in foundation pits displacement induces the experimental rig of soil deformation after wall |
| CN117949639A (en) * | 2024-03-27 | 2024-04-30 | 中铁二十三局集团第一工程有限公司 | Movable multipurpose retaining wall simulation test device and test method thereof |
| CN117949639B (en) * | 2024-03-27 | 2024-06-07 | 中铁二十三局集团第一工程有限公司 | Movable multipurpose retaining wall simulation test device and test method thereof |
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