CN105178366A - Model test device for vertical long-time settling character test of pile foundation and application of model test device - Google Patents
Model test device for vertical long-time settling character test of pile foundation and application of model test device Download PDFInfo
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- CN105178366A CN105178366A CN201510324680.7A CN201510324680A CN105178366A CN 105178366 A CN105178366 A CN 105178366A CN 201510324680 A CN201510324680 A CN 201510324680A CN 105178366 A CN105178366 A CN 105178366A
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Abstract
The invention provides a model test device for a vertical long-time settling character test of a pile foundation. The model test device comprises a test model box, a loading system and a test system. The test model box is a body of the model text device and used for simulating a tested object. The loading system is arranged on the test model box and used for conducting simulating loading on the tested object. An original test object of the test system is arranged on an original tested object of the model box and used for testing the response of the tested object under the dynamic loading action. The test model box, the loading system and the test system are connected to achieve model test of the long-time settling character test of the pile foundation. The invention further discloses an application of for simulating and testing the vertical long-time settling character in different soil bodies under different train loading actions. By means of the model test device and the application, vertical power loading of a model pile can be achieved, stress strain of a pile body under the dynamic loading action can be tested, and the contact condition of the pile soil interface in a model accords with the actual situation.
Description
Technical field
The invention belongs to High Speed Rail Projects field, relate to analogue experiment installation, the simulation test device of the especially vertical long-term settlement characteristic test of bridge pile foundation.
Background technology
In order to reduce circuit entirety and differential settlement, improve train traffic safety, pile foundation is widely applied in High Speed Rail Projects.Compared with Other Engineering, the pile foundation in this type of engineering not only will bear the structural load on top, also will bear the dynamic loading that train operation produces, under long-term dynamic load function, the sedimentation and deformation characteristic of pile foundation gradually pay close attention to by expert.
For the research of this kind of pile foundation vertical long-term settlement characteristic issues, because field trial is difficult to realize usually, lacks field measurement data, constrain the progress of problem, so indoor model test becomes particularly important.
At present, be generally made up of Model Pile, model clay, model groove, data collecting system, plate test loading system for the model test apparatus of pile foundation settlement characteristic research both at home and abroad.Wherein, Model Pile many employings steel pipe or aluminum pipe are simulated, and can consider the scaling law of the strength of materials and physical dimension, and because the external surface of steel pipe and aluminum pipe is comparatively smooth, the contact situation of stake Soil Interface differs far away with reality, model clay can select sand, silt or cohesive soil according to actual conditions, model groove is generally hollow cuboid or cylindrical structure, is formed by steel frame and steel plate splicing, data collecting system is generally made up of displacement meter, strain meter and signal sampler, experiment loading unit, be main mainly with simple vertical or level to static loading, the load distribution characteristics being difficult to simulate bullet train carries out power loading, the experimental rig that minority realizes the loading of pile foundation power is also that simple displacement controllable back and forth loads, as China Hydropower Advisory Group East China Survey Design Academe's patent (Authorization Notice No. CN203432852U) " the horizontal static load of pile foundation indoor model test and cyclic loading bringing device ", this device comprises swing arm, be fixedly connected on the RC roller bearing of swing arm soffit, be positioned at the rolling bearing immediately below roller bearing, and be wound in load transfering strip roller bearing and rolling bearing realizing be in transmission connection, be connected with translation dowel bar below rolling bearing simultaneously, translation dowel bar one end connects strain gauge and test model stake successively, by dowel bar, Model Pile is back and forth loaded, this mechanical loading system complex structure, loading frequency is little, the CYCLIC LOADING number of times of single test is little, loading accuracy is also difficult to ensure.
In sum, still lack a kind of model test apparatus for studying pile foundation vertical long-term settlement characteristic under High-speed Train Loads at present, a kind of model test apparatus that can react the contact of real stake soil, stake top load and train load and be close.
Summary of the invention
The object of the present invention is to provide and a kind ofly test model test apparatus of pile foundation vertical long-term settlement characteristic and uses thereof, can realize the vertical long-term settlement characteristic test of pile foundation in various soil mass, under different High-speed Train Loads, the project of testing comprises pile head settlement and pile body stress.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A model test apparatus for pile foundation long-term settlement characteristic test, comprises test model case, loading system and test macro, and three possesses different functions respectively, and test model case is the main body of model test apparatus, for simulating measurand; Loading system is arranged on test model case, for carrying out simulation loading to measurand; The test original paper of test macro is arranged on the tested original paper of model casing, for testing the response of measurand under dynamic load function.
Described model casing comprises model groove, Model Pile, model clay; Described loading system comprises reaction frame for loading, air compressor, function signal generator, electric Proportion valve, cylinder; Described test macro comprises dynamo-electric dial gage, electronics foil gauge, dynamic strain Acquisition Instrument.
Described Model Pile adopts concrete prefabricated forming, Model Pile by model clay placement in layers in model groove.Described Model Pile diameter 4cm, the long 50cm ~ 60cm of stake, concrete grade C30, the poly (methyl methacrylate) plate of the thick 0.8cm of the wide 4cm of a long 6cm is posted as pile cover in Model Pile stake top, a plain bar is furnished with in the middle of described Model Pile, described plain bar posts an electronics foil gauge at interval of 15cm, described electronics foil gauge is connected with plain conductor and draws from plain bar one end, and the collection port of described plain conductor and dynamic strain Acquisition Instrument links together.
Described model groove is positioned over the base plate middle of reaction frame for loading, model groove by steel frame and poly (methyl methacrylate) plate assembled, it is characterized in that: model groove is of a size of 800 × 800 × 800 (cm), described steel frame adopts ∠ 30 × 30 × 3 angle steel to be welded, described poly (methyl methacrylate) plate thickness of slab 1cm.
Described reaction frame for loading comprises base plate, reaction beam and connecting rod, it is characterized in that reaction beam is connected by connecting rod with base plate, described connecting rod is the threaded rod of 4 long 1.5m of diameter 3.2cm, and counter-force depth of beam regulates by the nut on connecting rod.
Described reaction beam is bolted by girder and secondary beam and forms, described girder is welded into "mouth" shape by four i iron, be of a size of 840 × 840 (cm), described secondary beam is the i iron of two long 840cm, be bolted on girder, described girder is arranged organizes bolt hole more, and the position of secondary beam on girder can regulate.
Described loading system comprises air compressor, air compressor is connected with the air inlet port of electric Proportion valve by high-pressure air pipe, the adjustable pressure scope of described electric Proportion valve is 0 ~ 1MPa, maximum stream flow is 5000L/min, input voltage range is 0 ~ 10VDC, the gas outlet of described electric Proportion valve is connected with cylinder by high-pressure air pipe, the minimum use air pressure >=2MPa of described high-pressure air pipe, electric Proportion valve is connected by plain conductor and function signal generator, the output signal frequency scope of described function signal generator is 0.1 ~ 100Hz, described cylinder is secured by bolts on the secondary beam of reaction frame for loading, the piston rod of cylinder is contacted with Model Pile pile cover, secondary beam is arranged and organizes bolt hole more, the position of cylinder on secondary beam can regulate, the feature of described cylinder is: cylinder diameter 5cm, use air pressure range is 0 ~ 5MPa, piston rod stroke 8cm.
Described dynamo-electric dial gage is fixed on by gauge stand on the secondary beam of described reaction beam, the described indicator of dynamo-electric dial gage contacts with the pile cover of Model Pile, described dynamo-electric dial gage is connected with the collection port of dynamic strain Acquisition Instrument, the measurement range of described dynamo-electric dial gage is 0 ~ 5cm, and certainty of measurement is 0.01mm.
The purposes of above-mentioned model test apparatus, uses it for the vertical long-term settlement characteristic of simulation pile foundation in various soil mass, under different High-speed Train Loads and is also tested.
The project tested comprises pile head settlement (such as 0 ~ 5cm) and pile body stress.
Loading frequency scope reaches 0.1 ~ 100Hz, and the loading number of times in single test reaches 20,000 times.
Owing to adopting such scheme, the invention has the beneficial effects as follows: can the vertical power of implementation model stake load, the vertical long-term settlement characteristic of pile foundation under the train load condition of test different characteristics; Model Pile adopts concrete reinforcement prefabricated, arrangement of reinforcement is pasted with foil gauge, can test the ess-strain of pile body under Under Dynamic Load, and the contact situation of model king-pile Soil Interface conforms to actual, can simulate the Vertical Settlement characteristic of pile foundation under long-term High-speed Train Loads really.
Accompanying drawing explanation
Fig. 1 is total scheme of installation of apparatus of the present invention embodiment.
Fig. 2 is the structural representation of reaction frame for loading in the embodiment of the present invention.
Fig. 3 is the organigram of reaction beam in the embodiment of the present invention.
Fig. 4 is the organigram of Model Pile in the embodiment of the present invention.
Fig. 5 is the structural representation one (plan view) of base plate in the embodiment of the present invention.
Fig. 6 is the structural representation two (side elevational view) of base plate in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
As shown in Figure 1, a model test apparatus for pile foundation vertical long-term settlement characteristic test, comprising: model groove 1, Model Pile 2, model clay 3, reaction frame for loading 4, air compressor 5, electric Proportion valve 6, dc source 7, function signal generator 8, dynamic strain Acquisition Instrument 9, cylinder 10, dynamo-electric dial gage 11, gauge stand 12, high-pressure air pipe 13, plain conductor 14; Model groove 1 is positioned over the lower shoe centre position of reaction frame for loading 4, uses model clay 3 placement in layers in model groove 1 Model Pile 2; Air compressor 5, electric Proportion valve 6 and cylinder 10 is connected successively with high-pressure air pipe 13, and cylinder 10 is connected to bolt on the secondary beam of reaction frame for loading 4, the piston rod of cylinder 10 is contacted with Model Pile 2 pile cover, is reconciled making piston rod carry out power loading to Model Pile 2 by air pressure; Connect successively with the terminals of plain conductor 14 by dc source 7, function signal generator 8, electric Proportion valve 6; Controlled by function signal generator 8 pairs of Loaded contact analysis, the wire that electronics foil gauge in the wire of dynamo-electric dial gage 11 and Model Pile 2 is drawn is connected on the data acquisition port of dynamic strain Acquisition Instrument 9.
As shown in Figure 2, described Model Pile 2, pile body adopts concrete prefabricated forming, and centre is furnished with the reinforcing bar 201 of diameter 0.6cm, reinforcing bar posts electronics foil gauge 202, and electronics foil gauge is for testing pile body stress.
As shown in Figure 3, comprising: load reaction beam 401, base plate 402, connecting rod 403, nut 404, load reaction beam 401 to be connected by four connecting rods 403 with between base plate 402, load reaction beam 401 and be fixed by nut 404 with base plate 402, the height loading reaction beam 401 can be regulated by nut 404.
As shown in Figure 4, comprising: girder 401a, secondary beam 401b, small size bolt hole 401c, oversize reamer bolt hole 401d, girder 401a is welded by i iron, square shape, described small size bolt hole 401c totally eight groups 32, eight groups on girder 401a small size bolt hole 401c are used for fixing secondary beam 401b, three groups on secondary beam 401b small size bolt hole 401c are used for fixing cylinder 10, and described oversize reamer bolt hole 401d loads reaction beam 401 and connecting rod 403 for connecting.
Fig. 5 is the structure chart one (plan view) of the base plate 402 of reaction frame for loading 4, as shown in Figure 5, described base plate 402 is lattice plate form, surface is steel plate 402a, the lattice that centre is welded for steel plate 402a, four edges are provided with oversize reamer bolt hole 402b, and oversize reamer bolt hole 402b is used for connecting bottom board 402 and connecting rod 403.
Fig. 6 is the structure chart two (side elevational view) of the base plate 402 of reaction frame for loading 4, and as shown in Figure 6, base plate 402 is welded by steel plate 402a, and the edge of base plate is provided with oversize reamer bolt hole 402b.
The connection of experimental rig of the present invention and test procedure are:
Model groove 1 is fixed on the base plate 402 of reaction frame for loading 4, Model Pile 2 is set in model groove 1 and fills model clay 3, after having filled, dynamo-electric dial gage 11 is fixed on loading reaction beam 401 by gauge stand 12 and makes it to contact with the pile cover 203 of Model Pile 2;
High-pressure air pipe 13 is adopted to connect air compressor 5, electric Proportion valve 6, cylinder 10 successively, and cylinder 10 is fixed on the secondary beam 401b of loading reaction beam 401 as power take-off, and make it to contact with Model Pile 2 pile cover 203, connect the electronic original parts such as dc source 7, function signal generator 8, electric Proportion valve 6 with plain conductor 14 successively subsequently;
Electronics foil gauge 202 is drawn with the wire of dynamo-electric dial gage 11 and is connected with dynamic strain Acquisition Instrument 9;
Open the power switch of air compressor 5, dynamic strain Acquisition Instrument 9 and function signal generator 8;
Signal output waveform is arranged to function signal generator 8, starts to load and measure displacement at pile top and pile strain.
Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (10)
1. a model test apparatus for pile foundation long-term settlement characteristic test, is characterized in that: comprise test model case, loading system and test macro, and wherein, test model case is the main body of model test apparatus, for simulating measurand; Loading system is arranged on test model case, for carrying out simulation loading to measurand; The test original paper of test macro is arranged on the tested original paper of model casing, for testing the response of measurand under dynamic load function; Described test model case, loading system and test macro are interconnected the model testing realizing the characteristic test of pile foundation long-term settlement.
2. model test apparatus according to claim 1, is characterized in that: described test model case comprises model groove, Model Pile, model clay; Described loading system comprises reaction frame for loading, air compressor, high-pressure air pipe, function signal generator, electric Proportion valve, cylinder; Described test macro comprises dynamo-electric dial gage, electronics foil gauge, dynamic strain Acquisition Instrument; Wherein, described model groove is arranged at the lower shoe centre position of reaction frame for loading, described Model Pile with model clay placement in layers in model groove; Air compressor, electric Proportion valve and cylinder is connected successively by high-pressure air pipe; Cylinder is bolted on the secondary beam of reaction frame for loading, and the piston rod of cylinder is contacted with the pile cover of Model Pile, makes piston rod carry out power loading to Model Pile by air pressure adjustment; Connected successively by the terminals of wire by dc source, function signal generator, electric Proportion valve; The wire of being drawn by electronics foil gauge in the wire of dynamo-electric dial gage and Model Pile is connected on the data acquisition port of dynamic strain Acquisition Instrument.
3. model test apparatus according to claim 2, is characterized in that: described Model Pile is concrete precast pile; Preferably, Model Pile diameter 4cm, the long 50 ~ 60cm of being of stake, pile concrete label are C30; Or preferably, 6 × 4 × 0.8cm poly (methyl methacrylate) plate pile cover is posted on described Model Pile stake top; Or preferably, described Model Pile is furnished with a plain bar, described reinforcing bar posts an electronics foil gauge for testing pile body stress every 15cm.
4. model test apparatus according to claim 2, is characterized in that: described model groove by steel frame and poly (methyl methacrylate) plate assembled; Preferably, model groove is of a size of 800 × 800 × 800cm, poly (methyl methacrylate) plate thickness of slab 1cm; Preferably, the measurement range of described dynamo-electric dial gage is 0 ~ 5cm, and certainty of measurement is 0.01mm.
5. model test apparatus according to claim 2, it is characterized in that: described reaction frame for loading comprises base plate, reaction beam and connecting rod, reaction beam is connected by connecting rod with base plate, counter-force depth of beam can regulate, described connecting rod diameter 3.2cm, long 1.5m, threaded rod quantity is 4.
6. model test apparatus according to claim 1, is characterized in that: the air pressure adjustment scope of described electric Proportion valve is 0 ~ 1MPa, and maximum stream flow is 5000L/min, and signal input range is 0 ~ 10VDC; Or preferably, the output signal frequency scope of described function signal generator is 0.1 ~ 100Hz; Or, preferably, the cylinder diameter 5cm of described cylinder, the air pressure scope of application 0 ~ 5MPa; Or, preferably, piston rod stroke 8cm, the position on secondary beam can regulate; Or, preferably, the minimum use air pressure >=2MPa of described high-pressure air pipe.
7. model test apparatus according to claim 5, is characterized in that: described dynamo-electric dial gage is fixed on described reaction beam, and the described indicator of dynamo-electric dial gage contacts to test pile head settlement with the pile cover of Model Pile.
8. the purposes of arbitrary described model test apparatus in claim 1 to 7, is characterized in that: use it for the vertical long-term settlement characteristic of simulation pile foundation in various soil mass, under different High-speed Train Loads and tested.
9. purposes according to claim 8, is characterized in that: the project of testing comprises pile head settlement and pile body stress.
10. purposes according to claim 8, is characterized in that: loading frequency scope reaches 0.1 ~ 100Hz, and the loading number of times in single test reaches 20,000 times.
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| CN201510324680.7A CN105178366A (en) | 2015-06-12 | 2015-06-12 | Model test device for vertical long-time settling character test of pile foundation and application of model test device |
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| CN201510324680.7A CN105178366A (en) | 2015-06-12 | 2015-06-12 | Model test device for vertical long-time settling character test of pile foundation and application of model test device |
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