CN205720219U - Phreatic table and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting - Google Patents

Phreatic table and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting Download PDF

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Publication number
CN205720219U
CN205720219U CN201620274192.XU CN201620274192U CN205720219U CN 205720219 U CN205720219 U CN 205720219U CN 201620274192 U CN201620274192 U CN 201620274192U CN 205720219 U CN205720219 U CN 205720219U
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China
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model casing
model
support
foundation pit
excavation
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CN201620274192.XU
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应宏伟
章丽莎
魏骁
王小刚
朱成伟
沈华伟
张金红
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a kind of phreatic table and artesian head works in coordination with the excavation of foundation pit model test apparatus of lifting.Including model casing, water tank, plane of symmetry gear soil unit, foundation pit supporting construction, pressure-bearing Stilt layer, artesian head regulation system and measurement system;Model casing includes model casing framework, reaction plate etc.;Water tank is arranged on the upper right side in model casing;Plane of symmetry gear soil unit is bolted on model casing framework;Pressure-bearing Stilt layer is arranged on bottom model casing, is connected with artesian head regulation system;Artesian head regulation system is made up of hydraulic pressure gauge, mariotte flask and support;This utility model can phreatic table and the lifting of artesian head in Simulation of Excavation Process;Measure Water And Earth Pressures and the deformation of foundation ditch under different phreatic table and artesian head, lift, for phreatic table and artesian head, the foundation ditch Study on Problems caused and effective test data support is provided, and provide foundation for theoretical analysis model afterwards.

Description

Phreatic table and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting
Technical field
This utility model relates to a kind of excavation models assay device, particularly relates to the base under phreatic table and artesian head jacking conditions Hole excavation model test apparatus, can be used for bearing course and overlying weak water penetration soil mass of foundation pit when simulated diving position and artesian head lifting Between interaction, the Water And Earth Pressures response of foundation ditch and problem on deformation under the different phreatic table of research and artesian head.
Background technology
In strand, riparian area rich groundwater, engineering often faces below aquiclude at the bottom of Deep Foundation Pit and remains at bearing course Situation, owing to the seasonal variety etc. of large-scale precipitation, seasonal drought, river or Lake Water bit line will cause phreatic table and pressure-bearing Head lifts, thus affects foundation ditch Water And Earth Pressures, deformation and stability further, and phreatic table and artesian head lifting cause Foundation pit deformation and destabilization problems be one of the material risk source of such area deep-foundation pit engineering.
Set soil constitutive model is used compared to the research of economics analysis method and finite element numerical method, calculated latent Calculating parameter is chosen and is had the biggest dependency by soil mass water soil pressure and deformation size that water level and artesian head lifting cause; In Practical Project, the more difficult Water And Earth Pressures carried out (being positioned at excavation of foundation pit region) at the bottom of Foundation Pit is monitored in real time, carries out a large amount of phase As engineering monitoring data statistic analysis to obtain phreatic table and the deformation rule of hole end aquiclude that artesian head lifting causes Method also is difficult to realize;In view of geotechnical model test under Chang Chongli, do not affect Soil Microstructure, soil particle size and soil particle Interphase interaction relation is consistent with practical situation, can objectively respond the interaction between subsoil water and the soil particle of soil mass of foundation pit, It is widely used in considering the microexamination of resistance to shear of soil strain stress relation.
At present, the relevant geotechnical model test research of traditional groundwater effect, do not consider that in water, the gas entrance test soil body may The unsaturated soil problem caused;Consider constant phreatic table effect excavation models test, have research (Peng Shuquan. sand barricade break Grand thin sight of bad mechanism studies [D]. Tongji University, and 2007.) use thin film to connect retaining wall by the method smearing epoxy resin after corona And model casing, the method can obtain tests excess pore water pressure, soil pressure and foundation pit deformation data in the soil body, but film corona Technique is complex, and when lateral diaphragm wall displacement is bigger, thin film may occur tear or owing to soil particle friction causes breakage in moving process, Test cannot be smoothly completed or carry out repeating test.Consider the excavation models test of groundwater level change impact, have research (grandson Prestige. the test of coastal region deep basal pit character and theoretical research [D]. Zhejiang University, 2015.) method that uses fixed retaining wall, should Method can only obtain the situation of change of excess pore water pressure in the soil body, it is impossible to obtains soil pressure change accurately and foundation pit deformation number According to, still suffer from larger difference with actual base pit engineering response condition under phreatic table and artesian head lift action.
In excavation models is tested, great majority research completes the foundation ditch stress under operating mode and deformation feelings for every one-level excavation and propping Condition is launched, and does not considers stress and the deformation of foundation ditch foundation ditch during excavation or propping.At the mould considering Excavation Process In type test, research is had to use earth bag (the Azevedo RF.Centrifuge and Analytical of the weight such as unloading equal-volume Modelling of Excavation in Sand.PhD thesis,University of Colorado,Boulder,CO,USA,1983.) Or discharge generation soil liquid (Bolton MD and Powrie W.The collapse of diaphragm walls retaining clay.G é Otechnique, 1987,37 (3): 335-353.) the method simulation soil excavation unloading such as, this type of method can not be opened by accurate simulation foundation ditch Digging the change of stress field in the soil body caused, the foundation ditch stress and the deformation that cause with actual excavation of foundation pit still suffer from certain difference Different.The model test employing pre-plugged of a large amount of simulating excavation installs the method for the retaining wall of support, direct excavation pit The soil body, it is not necessary to carrying out propping operation again, the method is relatively simple, but preset all inner supports all will be at whole digging process Middle stress, it is clear that inconsistent with the foundation ditch stressing conditions of Practical Project, also cannot non-propping in accurate simulation Excavation Process In the case of the stress of foundation ditch and deformation.Research is had to use hydraulic jack to apply the method simulation of power to retaining wall support at present The installation supported, the method uses hydraulic means more complicated, the method inapplicable when excavation of foundation pit width is bigger.The most exhausted The excavation plane of symmetry of most of excavation of foundation pit models is vertical fixing baffle plate, realizes excavation of foundation pit by grabbing downwards soil or soil digging, The method can not excavate soil layer, the soil body that meeting disturbance is not excavated by clear definition;The method is loaded down with trivial details, is difficult to operation, particularly foundation ditch When the size of excavation model is more compared with big or needs excavation the soil body, the workload of test operation is the biggest.Therefore, how to realize The Important Problems being to need in excavation of foundation pit model test to solve is installed in soil excavation and support exactly.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, this utility model provides phreatic table and artesian head is worked in coordination with the foundation ditch of lifting and opened Dig model test apparatus, solve phreatic table and artesian head in test and work in coordination with the problem of modelling of lifting, can simulated diving position and holding Interaction between subsoil water and soil mass of foundation pit when pressure head works in coordination with lifting, measures foundation ditch under different phreatic table and artesian head Water And Earth Pressures and deformation, arrange correlation test data and determine stress and the deformation of foundation ditch when phreatic table and artesian head work in coordination with lifting The problems such as law of development, lift, for phreatic table and artesian head, the foundation ditch Study on Problems caused and provide effective test data support, And provide foundation for theoretical analysis model afterwards.
This utility model solves its technical problem and be the technical scheme is that a kind of phreatic table and artesian head work in coordination with the base of lifting Hole excavation model test apparatus, makes somebody a mere figurehead including model casing, water tank, some planes of symmetry gear soil unit, foundation pit supporting construction, pressure-bearing Layer, artesian head regulation system and seven parts of measurement system;Described model casing is by model casing framework, safety glass, model casing Base plate, top frame, reaction plate and model casing base composition;The bottom fixed model box plate of described model casing framework, former and later two Safety glass is fixed in side;Described model casing framework and reaction plate are each attached on model casing base, and top is connected by top frame; The bottom right side of described model casing installs the second water flowing valve of connection pressure-bearing Stilt layer, adjusts for connection mode molding box and artesian head Joint system;
Described water tank is by the aluminium sheet of band limbers, bar shaped aluminium sheet, tank bracket, tank bracket fixed screw, rule and first Water flowing valve forms, the upper right side being erected in model casing by tank bracket, for the fluctuation in stage controlling and observing in the soil body; The surface of aluminum plate of described band limbers pastes anti-filter geotextile, tests the loss of the soil body during preventing groundwater change;Described Rule is pasted onto on safety glass, can be used for directly observing and record phreatic table situation of change;Described first water flowing valve is arranged On the right side of model casing in order to joining water box;
Described plane of symmetry gear soil unit is U-shaped stainless steel strip, is bolted on model casing framework;Described U-shaped rustless steel Being connected by H type watertight rubber bar between bar, U-shaped stainless steel strip is connected by S type watertight rubber bar with model casing framework;
Described foundation pit supporting construction includes retaining wall, retaining wall support and some support units;Support is passed through on described retaining wall top Fixing bolt fixed retaining wall support, middle part has screwed hole, by the support needed for screwed hole threaded installation support unit Fixing bolt, the fixing watertight rubber bar of both sides fluting;Described watertight rubber bar ensures to contact with model casing in retaining wall moving process Face does not leaks;One end of described support unit has inner thread mouth, and inner thread mouth is connected with supporting fixing bolt thread, real The installation of existing support unit;
Described pressure-bearing Stilt layer is made up of the corrosion resistant plate of band limbers, rustless steel short column and anti-filter geotextile;Described band water flowing Fix rustless steel short column bottom the corrosion resistant plate in hole, on the model casing base plate being positioned in model casing, and with four sides of model casing Face seal connects;The corrosion resistant plate surface mount anti-filter geotextile of described band limbers;
Described artesian head regulation system is made up of hydraulic pressure gauge, mariotte flask and support;Described hydraulic pressure gauge is connected by tee T Model casing and mariotte flask;Being provided with fixed pulley on described support, steel wire rope is walked around fixed pulley and is connected mariotte flask and hand Device, controls the size of the lift adjustment artesian head of mariotte flask by hand-operated device;Described mariotte flask is justified by lucite Cylinder, air intake valve, T-way water valve door, the gentle capsule of valve of giving vent to anger form;Bottom described plexiglass cylinder, air intake valve is set With T-way water valve door, top arranges valve of giving vent to anger;Described air intake valve is connected with air bag;
Described measurement system includes that miniature pore water pressure sensor, miniature soil pressure cell, displacement transducer, multi-channel data are adopted Collection instrument and digital camera;Described miniature pore water pressure sensor, miniature soil pressure cell, displacement transducer are transmitted by signal Line connecting multi-channel data collecting instrument;Described digital camera is positioned over model casing dead ahead.
Further, described support unit includes solid aluminum bar, expansion link and support connecting bolt;Have on described solid aluminum bar Some grooves, one end has inner thread mouth;Described expansion link is hollow aluminum pipe, and expansion link has some screwed holes;Described Support connecting bolt props up the groove of solid aluminum bar through the screwed hole on expansion link.
Further, described support unit includes the first support bar, the second support bar and sleeve;One end of described first support bar There is external screw thread;One end of described second support bar has inner thread mouth, and the other end has external screw thread;Described sleeve has interior spiral shell Stricture of vagina passage, threaded one end connects the first support bar, threaded second support bar of the other end.
Further, described digital camera answers exclusive PCR in process of the test, and its position can not be moved;Can be according to bat Take the photograph and need to set up light source.
Further, described model casing framework is welded by rustless steel steel bar thick for 10mm and stainless-steel sheet;Described tempering Glass is arranged on inside model casing framework by building glue;Described model casing base plate and reaction plate are the rustless steel steel that 10mm is thick Plate;Described top frame is welded by the rustless steel steel bar that 20mm is thick;Described model casing main body and reaction plate are by surrounding point solid welding Due to model casing base;Described retaining wall is aluminium sheet, and its thickness is obtained by the retaining wall Rigidity Calculation of test simulation;Described gear soil Wall bracket is the strip aluminium sheet that 20mm is thick;Described retaining wall keeps vertical with safety glass in moving process all the time;Described One water flowing valve, the second water flowing valve, air intake valve, T-way water valve door, valve of giving vent to anger are copper core valve.
Further, the diameter of described solid aluminum bar, the wall thickness of expansion link, the diameter of the first support bar, the second support bar straight The wall thickness of footpath and sleeve is obtained by the Rigidity Calculation of the inner support of test simulation.
Further, described air bag is built with the nitrogen of 1atm.
Further, described water tank and plexiglass cylinder are built with air free water.
Further, the test of the bottom in the model casing soil body is gravelly sand;The overlying test soil body is the weak water penetration soil body.
Further, the described weak water penetration soil body is clay silt;Described gravelly sand and the weak water penetration soil body use air free water saturated.
Compared with prior art, the beneficial effects of the utility model are:
1, this utility model uses the air free water saturation testing soil body before the test, provides depletion of QI artesian water environment, make in process of the test The hole that must test the soil body is full of air free water, has operated as above 2 benefits: one is to avoid underwater bubble to enter weak water penetration soil layer Cause the unsaturation problem (compared with saturated soil, the mechanical characteristic of unsaturated soil exists larger difference and uncertainty) of the soil body; Two is to avoid underwater bubble to disturb miniature pore water pressure sensor to affect its certainty of measurement.
2, this utility model water tank is erected in model casing, uses the gap between glass cement sealing radiator and model casing, band water flowing The aluminium sheet in hole makes the water level in water tank connect with test soil body water level, can be by the water level in regulating tank with simulation test soil The lifting of body phreatic table;Rule on water tank is pasted onto on safety glass, it is simple to directly observation and record phreatic table situation of change. Use the mariotte flask improved, by the air pressure inside and outside the nitrogen balance mariotte flask in air bag, utilize nitrogen to be insoluble in water Characteristic, for test the soil body build depletion of QI artesian water environment, be prevented effectively from routine mariotte flask supply water time gas soluble in water The soil body unsaturated soil problem that bubble causes;The auto-lock function utilizing hand-operated device is fixed the height of mariotte flask and is ensured to provide stable Artesian head pressure;Hydraulic pressure gauge connection mode molding box regulates system with artesian head, can accurately read the artesian head pressure of applying Size.
3, the test soil body in the pressure-bearing Stilt layer in this utility model on the one hand can realize from bottom to top abundant saturated model case, has It is beneficial to the discharge of gas in the test soil body;On the other hand connection artesian head regulation system is to provide pressure-bearing gravel layer different pressure-bearing Head is close with the mode of occurence of natural artesian water;Pressure-bearing gravel layer water penetration weak with overlying soil layer directly contacts objective simulation Interaction between bearing course and overlying weak water penetration soil layer in artesian head lifting process, is conducive to disclosing artesian water further The response of soil mass of foundation pit Water And Earth Pressures and the soil mass of foundation pit deformation rule that head lifting causes.Aluminium sheet in water tank belt limbers and pressure-bearing frame The surface mount anti-filter geotextile of the corrosion resistant plate of dead level band limbers, tests the loss of the soil body during preventing groundwater change. Often research experiment under gravity condition, does not affect the microstructure of soil mass of foundation pit so that between soil particle size and soil particle mutually Interactively is consistent with practical situation, is conducive to carrying out the microexamination relating to soil particle interphase interaction.
4, this utility model uses water tank and pressure-bearing Stilt layer to control the collaborative lifting of phreatic table and artesian head, it is possible to achieve as The experimental implementation of lower three types:
(1) close the first water flowing valve (phreatic table is constant) of water tank, regulate the big of mariotte flask Level Change artesian head Little, research artesian head lifting is on the response of soil mass of foundation pit Water And Earth Pressures, the impact of deformation, the water level shown by water tank graduation mark Line situation, knows that foundation ditch is dived the impact of phreatic table change by artesian water lifting;
(2) mariotte flask is fixed on specified altitude assignment (artesian head is constant), opens the water of the first water flowing valve regulating tank Bit line is with the phreatic table of the Control experiment soil body, and research phreatic table lifting is on the response of soil mass of foundation pit Water And Earth Pressures, the impact of deformation, logical Cross the artesian head pressure size that hydraulic pressure gauge shows, know the foundation ditch phreatic table lifting impact on the change of artesian head pressure;
(3) regulation phreatic table and the common lifting of artesian head, research phreatic table and the collaborative lifting of pressure water head are to soil mass of foundation pit Water And Earth Pressures response, the impact of deformation.
5, this utility model uses dismountable plane of symmetry gear soil unit, the soil body that interim gear passive zone of pit does not excavates, can be Remove plane of symmetry gear soil unit before excavating every layer soil body in advance, carry out excavation of foundation pit by the method unloading soil to the excavation of foundation pit plane of symmetry, Comparing the method that soil digging downward with tradition is fetched earth, this utility model can specify each layer of excavation soil layer not to be affected and does not excavates, operation Convenient, greatly reduce excavation of foundation pit and unload the workload of soil.
6, this utility model can simultaneously simulating excavation and propping operation, obtain excavation of foundation pit and supporting in installation process and drawn The change of the foundation ditch stress field risen, compares and only considers what excavation of foundation pit to a certain degree of depth or propping completed with tradition excavation models test Particular state conducts a research, more comprehensively, reflection excavation of foundation pit and support foundation ditch stress and foundation pit deformation in installation process exactly Response condition;The soil body that foundation ditch will not excavated in inner support installation process by this utility model has disturbing influence;Inner support with It is threadably secured connection between retaining wall, than traditional excavation models test, inner support frame is located on retaining wall or direct Prop up the method that retaining wall realizes propping, more can reflect propping situation when actual base pit engineering excavates objectively;Real by controlling The wall thickness of heart aluminum shank diameter, expansion link wall thickness, the first support bar diameter, the second support bar diameter and sleeve realizes internal support of foundation pit The simulation of rigidity, more objectively reflects the inner support Effects on Engineering to excavation of foundation pit;Can according to the demand of geotechnical model test, Adjust the quantity of inner support element, and the inner support on retaining wall fixes position and the quantity of bolt, opening of the different foundation ditch of simulation Dig situation.
7, this utility model uses retractable supports element, can simulate the excavation of foundation pit test of different in width, compare with traditional Excavation of foundation pit model test uses the support of regular length or retractable supports to be only used for realizing supporting the experimental considerations installed, can Use same set of assay device to carry out the excavation of foundation pit test of many group different in width, decrease the repacking to assay device, save Experimentation cost and modelling time, operation principle is simple, easy to operate, has the biggest practicality.
Accompanying drawing explanation
Fig. 1 (a) works in coordination with the excavation of foundation pit model test apparatus side-looking of lifting for the phreatic table and artesian head using first kind support Figure.
Fig. 1 (b) works in coordination with the excavation of foundation pit model test apparatus side-looking of lifting for the phreatic table and artesian head using Equations of The Second Kind support Figure.
The model casing top view that Fig. 2 (a) supports for using the first kind.
The model casing top view that Fig. 2 (b) supports for using Equations of The Second Kind.
Fig. 3 is excavation of foundation pit plane of symmetry schematic diagram;
Fig. 4 is water tank side view;
Fig. 5 (a) is the plane graph of pressure-bearing Stilt layer structure.
Fig. 5 (b) is the side view of pressure-bearing Stilt layer structure.
Fig. 6 is retaining wall schematic diagram.
Fig. 7 (a) is the foundation pit supporting construction schematic diagram that the first kind supports.
Fig. 7 (b) is the foundation pit supporting construction schematic diagram that Equations of The Second Kind supports.
In figure: model casing 1;Model casing framework 1-1;Safety glass 1-2;Model casing base plate 1-3;Top frame 1-4;Reaction plate 1-5; Model casing base 1-6;Water tank 2;Aluminium sheet 2-1 with limbers;Bar shaped aluminium sheet 2-2;Tank bracket 2-3;Tank bracket fixes spiral shell Silk 2-4;Rule 2-5;First water flowing valve 2-6;Plane of symmetry gear soil unit 3;The bolt 4 of fixed symmetrical face gear soil unit;Gear Cob wall 5;Watertight rubber bar 5-1;Retaining wall support 6;Bracket fixing bolt 7;Support unit 8;Solid aluminum bar 8-1;Hollow aluminum Bar 8-2;Support connecting bolt 8-3;First support bar 8-4;Second support bar 8-5;Sleeve 8-6;Support fixing bolt 8-7; Pressure-bearing Stilt layer 9;Corrosion resistant plate 9-1 with limbers;Rustless steel short column 9-2;Anti-filter geotextile 9-3;Second water flowing valve 10;Hydraulic pressure gauge 11;Mariotte flask 12;Plexiglass cylinder 12-1;Air intake valve 12-2;T-way water valve door 12-3;Go out Air valve 12-4;Air bag 12-5;Support 13;Fixed pulley 13-1;Steel wire rope 13-2;Hand-operated device 13-3;Gravelly sand 14-1;Cement Silt 14-2;Air free water 15.
Detailed description of the invention
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1 and Figure 2, this utility model phreatic table and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, Adjust including model casing 1, water tank 2, some planes of symmetry gear soil unit 3, foundation pit supporting construction, pressure-bearing Stilt layer 9, artesian head Joint system and seven parts of measurement system.
Described model casing 1 is by model casing framework 1-1, safety glass 1-2, model casing base plate 1-3, top frame 1-4, reaction plate 1-5 Form with model casing base 1-6;The bottom fixed model box plate 1-3 of described model casing framework 1-1, former and later two sides are fixed Safety glass 1-2;Described model casing framework 1-1 and reaction plate 1-5 is fixed on, by surrounding spot welding, the model that I-steel is welded On bottom seat 1-6, top is connected by surrounding spot welding by stainless steel top frame 1-4;Described model casing framework 1-1 is by 10mm thickness Rustless steel steel bar and stainless-steel sheet are welded;Described safety glass 1-2 is arranged on model casing framework 1-1 by building glue Inner side;Described model casing base plate 1-3 and reaction plate 1-5 is the stainless-steel sheet that 10mm is thick;Described top frame 1-4 is thick by 20mm Rustless steel steel bar be welded;
Described water tank 2 is by the aluminium sheet 2-1 of the band limbers vertically placed, the steel of laterally disposed bar shaped aluminium sheet 2-2, front and back both sides The inwall changing glass 1-2 and model casing framework 1-1 connects formation by glass cement, is erected at model casing 1 by tank bracket 2-3 Interior upper right side, for the fluctuation in stage controlling and observing in the soil body;The aluminium sheet 2-1 and tank bracket 2-3 of described band limbers Connection is tightened by tank bracket fixed screw 2-4;The aluminium sheet 2-1 surface mount anti-filter geotextile of described band limbers, prevents The loss of the soil body is tested during groundwater change;Described rule 2-5 is arranged on safety glass 1-2 and can be used for directly observing With record phreatic table situation of change;The first water flowing valve 2-6 of joining water box 2 is installed on the right side of described model casing 1, is used for controlling The lifting of water level in water tank 2.
Described plane of symmetry gear soil unit 3 is U-shaped stainless steel strip, is fixed on model casing framework 1-1 by bolt 4;Described U Being connected by H type watertight rubber bar between type stainless steel strip, U-shaped stainless steel strip and model casing framework 1-1 are by S type sealing rubber Adhesive tape connects;
Described foundation pit supporting construction includes retaining wall 5, retaining wall support 6 and some support units 8;Described retaining wall 3 is moving During all the time with safety glass 1-2 keep vertical;One end of described support unit 8 has an inner thread mouth, inner thread mouth with Fixing bolt 8-7 is threaded in support, it is achieved the installation of support unit 8;
Described pressure-bearing Stilt layer 9 is made up of the corrosion resistant plate 9-1 of band limbers, rustless steel short column 9-2 and anti-filter geotextile 9-3; Rustless steel short column 9-2 is fixed, the model casing base plate 1-3 being positioned in model casing 1 bottom the corrosion resistant plate 9-1 of described band limbers On, and be tightly connected by glass cement with four sides of model casing 1;The corrosion resistant plate 9-1 surface mount of described band limbers Anti-filter geotextile 9-3, prevents from testing in artesian head change procedure the loss of the soil body;
The bottom right side of described model casing 1 installs the second water flowing valve 10 of connection pressure-bearing Stilt layer 9, for connection mode molding box 1 System is regulated with artesian head;The bottom test soil body in model casing 1 is gravelly sand 14-1, to simulate pressure-bearing soil layer;Overlying is tested The soil body is the weak water penetration soil body, can use clay silt 14-2, uses air free water saturated;
Described artesian head regulation system is made up of hydraulic pressure gauge 11, mariotte flask 12 and support 13;Described hydraulic pressure gauge 11 leads to Cross tee T connection mode molding box 1 and mariotte flask 12;Described mariotte flask 12 is by plexiglass cylinder 12-1, intake valve Door 12-2, T-way water valve door 12-3, valve 12-4 and air bag 12-5 composition of giving vent to anger;In described plexiglass cylinder 12-1 Liquid is air free water 15;Described air bag 12-5 is built with the nitrogen of 1atm;On described support 13, fixed pulley 13-1 is installed, Steel wire rope 13-2 walks around fixed pulley 13-1 and connects mariotte flask 12 and hand-operated device 13-3, controls Mario by hand-operated device 13-3 The size of the lift adjustment artesian head of special bottle 12;Described first water flowing valve 2-6, the second water flowing valve 10, air intake valve 12-2, T-way water valve door 12-3, the valve 12-4 that gives vent to anger are copper core valve;
Described measurement system includes that miniature pore water pressure sensor, miniature soil pressure cell, displacement transducer, multi-channel data are adopted Collection instrument and digital camera;Described miniature pore water pressure sensor, miniature soil pressure cell, displacement transducer are transmitted by signal Line connecting multi-channel data collecting instrument;Described digital camera is positioned over model casing dead ahead, can need to set up light source according to shooting; Described digital camera answers exclusive PCR in process of the test, and its position can not be moved;
As it is shown on figure 3, the thickness of described plane of symmetry gear soil unit 3 is 10mm, the spoil that its width can be simulated as required Layer thickness is adjusted;The size of the bolt 4 of described fixed symmetrical face gear soil unit 3 is M8, is fixedly welded on model casing framework On 1-1.
As shown in Figure 4, described water tank 2 is propped up by the aluminium sheet 2-1 of band limbers, bar shaped aluminium sheet 2-2, tank bracket 2-3, water tank Frame fixed screw 2-4, rule 2-5 and the first water flowing valve 2-6 composition;The aluminium sheet 2-1 surface of described band limbers is placed with Substantial amounts of water flowing circular hole, it is ensured that in process of the test, the water level in water tank connects and consistent with test soil body water level, to realize by adjusting Water level in water-saving box carrys out the phreatic table lifting of the Control experiment soil body.
As shown in Fig. 5 (a), Fig. 5 (b), the corrosion resistant plate 9-1 of described band limbers makes the depletion of QI in pressure-bearing Stilt layer 9 Water and gravelly sand 14-1 bearing course hydraulic communication, it is provided that the artesian head pressure of gravelly sand 14-1 bearing course;Described band limbers is not The arrangement of the rust thickness of steel plate 9-1, the arrangement of limbers and rustless steel short column 9-2 should meet Force Calculation requirement so that pressure-bearing Stilt layer 9 be enough to bear the weight of the test soil body.
As shown in Figure 6, described retaining wall 5 is aluminium sheet, and its thickness is obtained by the retaining wall Rigidity Calculation of test simulation;Described gear Cob wall support 6 is the strip aluminium sheet that 20mm is thick;Bracket fixing bolt 7 fixed retaining wall support is passed through on described retaining wall 5 top 6, middle part has screwed hole, fixes bolt 8-7 by the support needed for screwed hole threaded installation support unit 8, and both sides are opened Groove fixes watertight rubber bar 5-1;Described watertight rubber bar 5-1 ensures not send out with model casing 1 contact surface in retaining wall 5 moving process Life is leaked;Described bracket fixing bolt 7 and the size supporting fixing bolt 8-7 are M8.
As shown in Fig. 7 (a), Fig. 7 (b), described support is fixed bolt 8-7 and is passed through the screwed hole on retaining wall 5, tightens solid On retaining wall 5.Described support unit 8 can use following two form:
One, described support unit 8 includes solid aluminum bar 8-1, expansion link 8-2 and supports connecting bolt 8-3;Described solid aluminum bar Having some grooves on 8-1, one end has inner thread mouth;Described expansion link 8-2 is hollow aluminum pipe, if having on expansion link 8-2 Dry screwed hole;Described support connecting bolt 8-3 props up the groove of solid aluminum bar 8-1 through the screwed hole on expansion link 8-2 so that Solid aluminum bar 8-1 and expansion link 8-2 compact siro spinning technology, do not slide in process of the test.The diameter of described solid aluminum bar 8-1 and The thickness of hollow aluminum bar 8-2 is calculated by the support stiffness of test simulation;The size of described support connecting bolt 8-3 may select M6。
Two, described support unit 8 includes the first support bar 8-4, the second support bar 8-5 and sleeve 8-6;Described first support bar One end of 8-4 has external screw thread;One end of described second support bar 8-5 has inner thread mouth, and the other end has external screw thread;Described Sleeve 8-6 has female thread passage, and threaded one end connects the first support bar 8-4, the threaded second support bar 8-5 of the other end. The wall thickness of the diameter of described first support bar 8-4, the diameter of the second support bar 8-5 and sleeve 8-6 is by the inner support of test simulation Rigidity Calculation obtains.
Work process of the present utility model is as follows: first retaining wall 5 and retaining wall support 6 are connected by bracket fixing bolt 7 Assemble;Then installing soil pressure cell on retaining wall 5, both sides notch embeds watertight rubber bar 5-1, and at notch and sealing Epoxy resin is smeared in the gap of rubber strip 5-1;The retaining wall 5 assembled is erected in model casing 1 by retaining wall support 6, Ensure that retaining wall 5 is vertical with the safety glass 1-2 of model casing 1 both sides;The plane of symmetry is installed at the plane of symmetry of excavation of foundation pit model Gear soil unit 3, is fixed on model casing framework 1-1 by the bolt 4 of fixed symmetrical face gear soil unit;It is layered in model casing 1 Filling gravelly sand 14-1 compacting, fills to specified altitude assignment;Layering filling clay silt 14-2 compacting, until having banketed, by leading to Water the second water flowing valve 10 leads to air free water saturation testing soil body gravelly sand 14-1 and clay silt with the speed of 50L/ days to model casing 1 14-2, treats that the soil body closes water flowing the second water flowing valve 10 after fully saturated;Pore water pressure sensor is buried in boring underground, and backfill is bored The hole soil body;Soil body surface installation position displacement sensor inside and outside retaining wall 5 and foundation ditch, monitors displacement and the foundation ditch of retaining wall 5 respectively Soil deformation situation;
Open T-way water valve door 12-3 and the valve 12-4 that gives vent to anger, by T-way water valve door 12-3 having to mariotte flask 12 Injecting air free water 15 in machine glass cylinder 12-1, by giving vent to anger, valve 12-4 discharges the gas in plexiglass cylinder 12-1;Treat Fill air free water in machine glass cylinder 12-1, close T-way water valve door 12-3 and the valve 12-4 that gives vent to anger;By air intake valve 12-2 Connect the air bag 12-5 equipped with 1atm nitrogen;Then adjusted by water flowing the second water flowing valve 10 connection mode molding box 1 and artesian head Joint system.
Digital camera is placed in model casing dead ahead (cannot move in process of the test), regulates camera parameter, number is set The automatic shooting time interval of photographing unit is 20s;If laboratory insufficient light, Led light source can be set up in digital camera both sides; Utilize miniature pore water pressure sensor, miniature soil pressure cell and displacement sensing under data collecting instrument acquisition and recording test original state The reading of device, utilizes the test soil body photo under digital camera shooting test original state;
After treating that above-mentioned test preparation completes, the water level opened in the first water flowing valve 2-6 regulating tank 2 carrys out analogue model The phreatic table lifting of the test soil body in case 1;Open water flowing the second water flowing valve 10, T-way water valve door 12-3 and air intake valve 12-2, and it is held open state in whole soil mass of foundation pit excavation and support installation process, it is achieved artesian head regulation system is to holding Artesian head needed for the test of pressure rack dead level 9 sustainable supply;By the height of hand-operated device 13-3 regulation mariotte flask 12, profit The height of mariotte flask 12 is fixed, to control the size of artesian head, by hydraulic pressure gauge 11 with the auto-lock function of hand-operated device 13-3 Read artesian head size;Remove first segment plane of symmetry gear soil unit, slowly opened by the method unloading soil to the excavation of foundation pit plane of symmetry Dig the soil body on the left of retaining wall 5;When being excavated to below first supported design position, first is installed and supports, by supporting 8 The female thread of one end is fixed bolt 8-7 with the support on retaining wall 5 and is connected, and is allowed to hold out against counter-force by adjusting the length supporting 8 Frame 1-5, completes to support the installation of 8.Complete to continue the excavation soil body after first supports installation, use identical method installation Support, until excavation of foundation pit completes.
In whole excavation of foundation pit process of the test, apply, by water tank 2, the phreatic table that each operating mode of excavation of foundation pit is corresponding, pass through Artesian head regulation system applies the artesian head that each operating mode of excavation of foundation pit is corresponding;By data collecting instrument continuous acquisition record Miniature pore water pressure sensor, miniature soil pressure cell and the reading of displacement transducer in process of the test, by triggering digital photographing Machine shoots the photo testing soil deformation in whole process of the test.
By miniature pore water pressure sensor and the reading of miniature soil pressure cell of analytical data Acquisition Instrument acquisition and recording, draw base Cheat phreatic table and artesian head in whole digging process and work in coordination with the Water And Earth Pressures response pattern that lifting causes;Gathered by analytical data The reading of the displacement transducer of instrument record, and the photo captured by logarithmic code photographing unit carries out PIV graphical analysis, draws the soil body Displacement field, thus learn that soil mass of foundation pit works in coordination with the deformation rule of lifting with phreatic table and artesian head.
Above-described embodiment is a preferred implementation of the present utility model, is further to this utility model content and application thereof Illustrate, should not be construed as this utility model and be only applicable to above-described embodiment.All based on this utility model principle with utility model content The technology realized belongs to scope of the present utility model.

Claims (8)

1. a phreatic table and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterized in that, including model casing (1), water tank (2), some planes of symmetry gear soil unit (3), foundation pit supporting construction, pressure-bearing Stilt layer (9), artesian head regulation system and seven parts of measurement system;Described model casing (1) is made up of model casing framework (1-1), safety glass (1-2), model casing base plate (1-3), top frame (1-4), reaction plate (1-5) and model casing base (1-6);Bottom fixed model box plate (1-3) of described model casing framework (1-1), safety glass (1-2) is fixed in former and later two sides;Described model casing framework (1-1) and reaction plate (1-5) are each attached on model casing base (1-6), and top is connected by top frame (1-4);The bottom right side of described model casing (1) installs connection pressure-bearing Stilt layer (9) and the second water flowing valve (10) of artesian head regulation system;
Described water tank (2) is made up of the aluminium sheet (2-1) of band limbers, bar shaped aluminium sheet (2-2), tank bracket (2-3), tank bracket fixed screw (2-4), rule (2-5) and the first water flowing valve (2-6), is erected at the upper right side in model casing (1) by tank bracket (2-3);Aluminium sheet (2-1) the surface mount anti-filter geotextile of described band limbers;Described rule (2-5) is pasted onto on safety glass (1-2);Described first water flowing valve (2-6) is arranged on the right side of model casing (1) in order to joining water box (2);
Described plane of symmetry gear soil unit (3) is U-shaped stainless steel strip, is fixed on model casing framework (1-1) by bolt (4);Being connected by H type watertight rubber bar between described U-shaped stainless steel strip, U-shaped stainless steel strip is connected by S type watertight rubber bar with model casing framework (1-1);
Described foundation pit supporting construction includes retaining wall (5), retaining wall support (6) and some support units (8);Bracket fixing bolt (7) fixed retaining wall support (6) is passed through on described retaining wall (5) top, middle part has screwed hole, bolt (8-7), the fixing watertight rubber bar (5-1) of both sides fluting is fixed by the support needed for screwed hole threaded installation support unit (8);One end of described support unit (8) has inner thread mouth, and inner thread mouth is threadeded with supporting fixing bolt (8-7);
Described pressure-bearing Stilt layer (9) is made up of the corrosion resistant plate (9-1) of band limbers, rustless steel short column (9-2) and anti-filter geotextile (9-3);The fixing rustless steel short column (9-2) in corrosion resistant plate (9-1) bottom of described band limbers, it is positioned on the model casing base plate (1-3) in model casing (1), and is tightly connected with four sides of model casing (1);Corrosion resistant plate (9-1) surface mount anti-filter geotextile (9-3) of described band limbers;
Described artesian head regulation system is made up of hydraulic pressure gauge (11), mariotte flask (12) and support (13);Described hydraulic pressure gauge (11) passes through tee T connection mode molding box (1) and mariotte flask (12);Being provided with fixed pulley (13-1) on described support (13), steel wire rope (13-2) is walked around fixed pulley (13-1) and is connected mariotte flask (12) and hand-operated device (13-3);Described mariotte flask (12) is made up of plexiglass cylinder (12-1), air intake valve (12-2), T-way water valve door (12-3), valve of giving vent to anger (12-4) and air bag (12-5);Described plexiglass cylinder (12-1) bottom arranges air intake valve (12-2) and T-way water valve door (12-3), and top arranges valve (12-4) of giving vent to anger;Described air intake valve (12-2) is connected with air bag (12-5);
Described measurement system includes miniature pore water pressure sensor, miniature soil pressure cell, displacement transducer, multi-Channels Data Acquisition and digital camera;Described miniature pore water pressure sensor, miniature soil pressure cell, displacement transducer pass through signal transmssion line connecting multi-channel data collecting instrument;Described digital camera is positioned over model casing dead ahead.
A kind of phreatic table the most according to claim 1 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterized in that, described support unit (8) includes solid aluminum bar (8-1), expansion link (8-2) and supports connecting bolt (8-3);Having some grooves on described solid aluminum bar (8-1), one end has inner thread mouth;Described expansion link (8-2) is hollow aluminum pipe, and expansion link (8-2) has some screwed holes;Described support connecting bolt (8-3) props up the groove of solid aluminum bar (8-1) through the screwed hole on expansion link (8-2).
A kind of phreatic table the most according to claim 1 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterized in that, described support unit (8) includes the first support bar (8-4), the second support bar (8-5) and sleeve (8-6);One end of described first support bar (8-4) has external screw thread;One end of described second support bar (8-5) has inner thread mouth, and the other end has external screw thread;Described sleeve (8-6) has female thread passage, and threaded one end connects the first support bar (8-4), threaded second support bar of the other end (8-5).
A kind of phreatic table the most according to claim 1 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterised in that described model casing framework (1-1) is welded by rustless steel steel bar thick for 10mm and stainless-steel sheet;Described safety glass (1-2) is arranged on model casing framework (1-1) inner side by building glue;Described model casing base plate (1-3) and reaction plate (1-5) are the stainless-steel sheet that 10mm is thick;Described top frame (1-4) is welded by the rustless steel steel bar that 20mm is thick;Described model casing main body and reaction plate (1-5) are fixed on model casing base (1-6) by surrounding spot welding;Described retaining wall (5) is aluminium sheet;Described retaining wall support (6) is the strip aluminium sheet that 20mm is thick;Described retaining wall (5) keeps vertical with safety glass (1-2) in moving process all the time;Described first water flowing valve (2-6), the second water flowing valve (10), air intake valve (12-2), T-way water valve door (12-3), valve of giving vent to anger (12-4) are copper core valve.
A kind of phreatic table the most according to claim 1 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterised in that described air bag (12-5) is built with the nitrogen of 1atm.
A kind of phreatic table the most according to claim 1 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterised in that described water tank (2) and plexiglass cylinder (12-1) are built with air free water (15).
A kind of phreatic table the most according to claim 1 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterised in that the bottom test soil body in model casing (1) is gravelly sand (14-1);The overlying test soil body is the weak water penetration soil body.
A kind of phreatic table the most according to claim 7 and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting, it is characterised in that the described weak water penetration soil body is clay silt (14-2).
CN201620274192.XU 2016-04-01 2016-04-01 Phreatic table and artesian head work in coordination with the excavation of foundation pit model test apparatus of lifting Withdrawn - After Issue CN205720219U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105675846A (en) * 2016-04-01 2016-06-15 浙江大学 Foundation pit excavation model testing device capable of cooperatively hoisting phreatic water level and pressure-bearing water head
CN106978826A (en) * 2017-04-28 2017-07-25 浙江科技学院 A kind of Foundation Pit bottom stability test method containing artesian water stratum
CN108447380A (en) * 2018-03-11 2018-08-24 北京工业大学 A kind of multifunctional tunnel excavates the model case apparatus of model test

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105675846A (en) * 2016-04-01 2016-06-15 浙江大学 Foundation pit excavation model testing device capable of cooperatively hoisting phreatic water level and pressure-bearing water head
CN105675846B (en) * 2016-04-01 2017-07-28 浙江大学 Phreatic table and the excavation of foundation pit model test apparatus of artesian head collaboration lifting
CN106978826A (en) * 2017-04-28 2017-07-25 浙江科技学院 A kind of Foundation Pit bottom stability test method containing artesian water stratum
CN108447380A (en) * 2018-03-11 2018-08-24 北京工业大学 A kind of multifunctional tunnel excavates the model case apparatus of model test

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