CN106759552A - One kind simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and its test method - Google Patents
One kind simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and its test method Download PDFInfo
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- CN106759552A CN106759552A CN201710052465.5A CN201710052465A CN106759552A CN 106759552 A CN106759552 A CN 106759552A CN 201710052465 A CN201710052465 A CN 201710052465A CN 106759552 A CN106759552 A CN 106759552A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
Invention provides a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and its test method.The device includes freeze thawing model casing, kind of refrigeration cycle instrument, pile sinking loading device and reaction frame.Freeze thawing model casing includes refrigerating chamber and soil sample chamber.Soil sample chamber is bolted on inside refrigerating chamber.Using the test method of the device steps such as sample, pile sinking loading, soil sample freezing, sampling defrosting and Parameter analysis are filled including model casing.The present invention can simulate calcareous sand ground in soil compaction during pile driving or the Particle Breakage process of piling process stake bottom and pile peripheral earth, and soil around pile sample is obtained well, can be studied malm and be restrained with evolution isotactic by the Particle Breakage after soil compaction effect, variable density, level.
Description
Technical field
The present invention relates to civil engineering experimental technique field, more particularly to a kind of simulation calcareous sand ground piling process particle
Crushing test model equipment and its test method.
Background technology
China just builds at the Efforts To Develop South Sea, actively realizes the strategic objective of " building ocean power ", and calcareous sand is
A kind of subsoil soil for being distributed widely in China South Sea region, it is by a kind of marine organisms origin cause of formation, internal porous gap, shape
Irregular Special Rock medium, therefore, the research to calcareous sand helps speed up the process of South Sea construction, with very great
Strategic importance.Pile foundation is the method for processing foundation commonly used in engineering construction, and it has high capacity, convenient, cost of constructing
Low series of advantages.There is the characteristic that Particle Breakage easily occurs in itself yet with calcareous sand, enter in South Sea calcareous sand area
Row pile foundation engineering is built, particularly during prefabricated pile piling, because Impact Load or soil compaction effect cause stake week
There is Particle Breakage in the soil body, the Particle Breakage of the soil body matches somebody with somebody the level for changing the soil body, the packing of the soil body, so as to further influence stake
The bearing capacity of base, therefore, the Particle Breakage situation of prefabricated pile pile peripheral earth during piling in calcareous sand ground is determined to grinding
The bearing capacity of pile foundation for studying carefully calcareous sand ground has very important significance, and to the stress test of stake Soil Interface in existing research
Research is less, and the Particle Breakage that pile-soil interaction causes more is studied without special experimental rig.Therefore, it is empty to fill up this
In vain, a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and test method are developed as not allowing at a quarter
Slow work.
The content of the invention
Present invention aim to address prefabricated pile cannot be determined in piling process in the pile foundation process of construction of calcareous sand ground
The problem of pile peripheral earth Particle Breakage situation, there is provided one kind simulation calcareous sand ground piling process Particle Breakage pilot model apparatus
And test method.
The technical scheme used to realize the object of the invention is such, one kind simulation calcareous sand ground piling process
Grain crushing test model equipment, including it is fixed on reaction frame and freeze thawing model casing on experimental bench.
The lower surface of the reaction frame top cross-bar is provided with pile sinking loading device.The pile sinking loading device lower end can be with
Model Pile is connected, and drives Model Pile along lengthwise movement.Temperature sensor is provided with the Model Pile.
The freeze thawing model casing is arranged in area of reaction frame test center.The freeze thawing model casing includes refrigerating chamber and soil sample
Room.
The soil sample chamber is the open rectangular box in upper end.The soil sample chamber is made up of metal heat-conducting material.The soil sample
Temperature sensor is equipped with room bottom and inwall.The refrigerating chamber is the rectangular box with top cover.The refrigerating chamber by every
Hot material is made.
The soil sample chamber is arranged in the inner chamber of refrigerating chamber.The soil sample chamber bottom is fixedly connected with refrigerating chamber bottom.Institute
State and space S is formed between refrigerating chamber and soil sample chamber.Freezing liquid is marked with the space S.The refrigerating chamber passes through metal cooling-pipe
Connected with kind of refrigeration cycle instrument.During experiment, freezing liquid is circulated between space S and kind of refrigeration cycle instrument.
One kind simulation calcareous sand ground piling process Particle Breakage pilot model apparatus, it is characterised in that including being fixed on
Reaction frame and freeze thawing model casing on experimental bench.
The lower surface of the reaction frame top cross-bar is provided with pile sinking loading device.The pile sinking loading device lower end can be with
Model Pile is connected, and drives Model Pile along lengthwise movement.Temperature sensor is provided with the Model Pile.
The freeze thawing model casing is arranged in area of reaction frame test center.The freeze thawing model casing includes refrigerating chamber and soil sample
Room.
The soil sample chamber is that upper end is open and interior hollow staving.The soil sample chamber is made up of metal heat-conducting material.It is described
Temperature sensor is equipped with soil sample chamber bottom and inwall.The refrigerating chamber is the hollow staving with top cover.The refrigerating chamber
It is made up of heat-barrier material.
The soil sample chamber is arranged in the inner chamber of refrigerating chamber.The soil sample chamber bottom is fixedly connected with refrigerating chamber bottom.Institute
State and space S is formed between refrigerating chamber and soil sample chamber.Freezing liquid is marked with the space S.The refrigerating chamber passes through metal cooling-pipe
Connected with kind of refrigeration cycle instrument.During experiment, freezing liquid is circulated between space S and kind of refrigeration cycle instrument.
Further, the pile sinking loading device includes electric loading system device, drive link and Model Pile erecting bed.Wherein, institute
State drive link and be arranged on electric loading system device lower section, Model Pile erecting bed is arranged on drive link lower end.The Model Pile erecting bed
It is upper that there is air level.The Model Pile erecting bed lower surface has fixed screw-cap.During experiment, the fixed screw-cap of Model Pile insertion
In reserved model stake holes, and it is bolted on Model Pile erecting bed by tightening.Electric loading system device drives drive link edge
Lengthwise movement, then drives Model Pile motion.
Further, the stake footpath of the Model Pile is 10mm~30mm, and length is 100~300mm；The kind of refrigeration cycle instrument
Temperature-control range is between -20 DEG C~80 DEG C.
Further, the length of the soil sample chamber is a, and width is b, is highly c, and wall thickness is d.Wherein, a=400~
600mm, b=400~600mm, c=500~700mm, d=5~10mm.The refrigerating chamber length is 900mm, and width is
900mmmm, is highly 800mm, and wall thickness is 10mm.
Further, the soil sample chamber and the reserved screw of refrigerating chamber bottom correspondence position.The soil sample chamber and refrigerating chamber pass through
Bolt is fixedly connected.
Invention additionally discloses a kind of on above-mentioned simulation calcareous sand ground piling process Particle Breakage pilot model apparatus
Test method, comprises the following steps：
1) according to predetermined level is with preparation calcareous sand and is well mixed.
2) calcareous sand soil sample is loaded in soil sample chamber using sand rain method, and appropriate water is poured into according to required saturation degree and formed
Calcareous sand soil layer.Wherein, the packed height of calcareous sand soil sample is 300~500mm.
3) model pile verticality is adjusted, Model Pile is fixed on pile sinking loading device lower end.
4) start-up loading device, is pressed into calcareous sand soil layer set depth by Model Pile as requested.
5) cover plate of refrigerating chamber is covered, it is -10 DEG C to set kind of refrigeration cycle instrument temperature, starts kind of refrigeration cycle instrument until soil sample chamber
With the temperature sensor temperature stabilization in Model Pile to setting value.
6) kind of refrigeration cycle instrument is closed, the cover plate of refrigerating chamber is opened, the calcium of piles with different footpath and stake bottom scope is taken out with soil sampler
Matter sand sample, measures the volume and quality of soil sample, soil sample then is put into baking oven and is toasted 24 hours at 60 DEG C.
7) after soil sample drying, a separating tests is carried out by oscillating sieving machine, can obtain calcareous sand at piles with different footpath point
Curve.
Further, the soil sampler is square soil sampler.The square soil sampler is the hollow rectangular of upper and lower side opening
Body.This cuboid 20~150mm long, 20~150mm wide, 100~600mm high.The hollow cuboid upper and lower side open-mouth
It is respectively provided with sharp metal cutter.
Further, the soil sampler is circular soil sampler.The circular soil sampler is the open hollow circuit cylinder of upper and lower side
Body.The internal diameter of this hollow circular cylinder is 39.1~50.1mm, is highly 80~100mm.The hollow circular cylinder upper and lower side is opened
Sharp metal cutter is respectively provided with mouthful.
The solution have the advantages that unquestionable：
A. this model equipment can be very good to simulate the piling process of prefabricated pile in calcareous Flooding in Borehole pile foundation engineering, by system
SAPMAC method instrument freezes soil sample so as to obtain complete calcareous sand soil sample, and the particle undergone after pile foundation treatment with studying calcareous Flooding in Borehole breaks
Broken situation, level effectively solve calcareous sand ground piling pile week and the stake ground soil body with evolution and variable density
Experimental study on particle breakage problem；
B. this model equipment can use cooperatively different soil samplers, can be very good to obtain the calcareous sand at piles with different footpath
Sample, so as to preferably study the Particle Breakage of calcareous Flooding in Borehole with the situation of change in stake footpath；
C. this model equipment simulates different packings, different saturation calcareous sand ground, different-diameter, difference as needed
Pile-type and different pile sinking loading speeds can be provided, applicability is wide.
Brief description of the drawings
Fig. 1 is model equipment structural representation；
Fig. 2 is freeze thawing model casing operating diagram；
Fig. 3 is freeze thawing mold box configuration schematic diagram；
Fig. 4 is heavy dress loading device structural representation；
Fig. 5 is square sampler structure schematic diagram；
Fig. 6 is circular sampler structure schematic diagram.
In figure：Space S, refrigerating chamber 1, top cover 101, soil sample chamber 2, calcareous sand soil layer 3, soil sampler 4, Model Pile 5, freezing liquid
7th, pile sinking loading device 8, electric loading system device 801, drive link 802, Model Pile erecting bed 803, air level 8031, fixed spiral
Cap 8032, reaction frame 9, kind of refrigeration cycle instrument 10, experimental bench 11, metal cooling-pipe 12.
Specific embodiment
With reference to embodiment, the invention will be further described, but should not be construed above-mentioned subject area of the invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, all should included within the scope of the present invention.
Embodiment 1：
The present embodiment provides a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus, including is fixed on
Reaction frame 9 and freeze thawing model casing on experimental bench 11.
Referring to Fig. 1, the lower surface of the top cross-bar of the reaction frame 9 is provided with pile sinking loading device 8.The pile sinking loading dress
Putting 8 lower ends can be connected with Model Pile 5, drive Model Pile 5 along lengthwise movement.The pile sinking loading device 8 can provide constant adding
Speed and constant pressure are carried, to simulate knocking pile sinking and static pressure pile-sinking.Temperature sensor is provided with the Model Pile 5.
The freeze thawing model casing is arranged in the area of test center of reaction frame 9, i.e. freeze thawing model casing is placed on pile sinking loading device 8
Lower section, and freeze thawing model casing is aligned with the center of pile sinking loading device 8.The freeze thawing model casing includes refrigerating chamber 1 and soil sample chamber
2。
Referring to Fig. 2 and Fig. 3, the soil sample chamber 2 is that upper end is open and interior hollow rectangular box.The soil sample chamber 2 is by gold
Category Heat Conduction Material is made.Temperature sensor is equipped with the bottom of the soil sample chamber 2 and inwall.The refrigerating chamber 1 is with top cover
101 hollow, rectangular casing.The refrigerating chamber 1 is made up of heat-barrier material.
The soil sample chamber 2 is arranged in the inner chamber of refrigerating chamber 1.The soil sample chamber 2 and the bottom correspondence position of refrigerating chamber 1 are reserved
Screw.The soil sample chamber 2 and refrigerating chamber 1 are bolted to connection.Space S is formed between the refrigerating chamber 1 and soil sample chamber 2.
Freezing liquid 7 is marked with the space S.The refrigerating chamber 1 is connected by metal cooling-pipe 12 with kind of refrigeration cycle instrument 10.During experiment,
Freezing liquid 7 is circulated between space S and kind of refrigeration cycle instrument 10, and cold is freezed to provide in space S.
Embodiment 2：
The present embodiment provides a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus, including is fixed on
Reaction frame 9 and freeze thawing model casing on experimental bench 11.
The lower surface of the top cross-bar of the reaction frame 9 is provided with pile sinking loading device 8.The lower end of pile sinking loading device 8
Can be connected with Model Pile 5, drive Model Pile 5 along lengthwise movement.The pile sinking loading device 8 can provide constant loading speed and
Constant pressure, to simulate knocking pile sinking and static pressure pile-sinking.Temperature sensor is provided with the Model Pile 5.
The freeze thawing model casing is arranged in the area of test center of reaction frame 9, i.e. freeze thawing model casing is placed on pile sinking loading device 8
Lower section, and freeze thawing model casing is aligned with the center of pile sinking loading device 8.The freeze thawing model casing includes refrigerating chamber 1 and soil sample chamber
2。
The soil sample chamber 2 is that upper end is open and interior hollow staving.The soil sample chamber 2 is made up of metal heat-conducting material.Institute
State and be equipped with temperature sensor on the bottom of soil sample chamber 2 and inwall.The refrigerating chamber 1 is the hollow staving with top cover 101.It is described
Refrigerating chamber 1 is made up of heat-barrier material.
The soil sample chamber 2 is arranged in the inner chamber of refrigerating chamber 1.The soil sample chamber 2 and the bottom correspondence position of refrigerating chamber 1 are reserved
Screw.The soil sample chamber 2 and refrigerating chamber 1 are bolted to connection.Space S is formed between the refrigerating chamber 1 and soil sample chamber 2.
Freezing liquid 7 is marked with the space S.The refrigerating chamber 1 is connected by metal cooling-pipe 12 with kind of refrigeration cycle instrument 10.During experiment,
Freezing liquid 7 is circulated between space S and kind of refrigeration cycle instrument 10, and cold is freezed to provide in space S.
Embodiment 3：
The present embodiment provides a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus, including is fixed on
Reaction frame 9 and freeze thawing model casing on experimental bench 11.
Referring to Fig. 1, the lower surface of the top cross-bar of the reaction frame 9 is provided with pile sinking loading device 8.
Referring to Fig. 4, the pile sinking loading device 8 includes electric loading system device 801, drive link 802 and Model Pile erecting bed
803.Wherein, the drive link 802 is arranged on the lower section of electric loading system device 801, and Model Pile erecting bed 803 is arranged on drive link
802 lower ends.The electric loading system device is that stress-strain controls formula, it is possible to provide constant loading speed and constant pressure, with
Simulation knocking pile sinking and static pressure pile-sinking.The lower surface of Model Pile erecting bed 803 has fixed screw-cap 8032.Model Pile 5 is inserted
In entering the reserved model stake holes of fixed screw-cap 8032, and it is bolted on Model Pile erecting bed 803 by tightening.The mould
Also there is air level 8031 on type stake erecting bed 803, to ensure the perpendicularity of model sunk pile.The stake footpath of the Model Pile 5 is
10mm, length is 100mm.Temperature sensor is provided with the Model Pile 5.During experiment, electric loading system device 801 drives transmission
Bar 802 then drives Model Pile 5 along lengthwise movement along lengthwise movement.
The freeze thawing model casing is arranged in the area of test center of reaction frame 9, i.e. freeze thawing model casing is placed on pile sinking loading device 8
Lower section, and freeze thawing model casing is aligned with the center of pile sinking loading device 8.The freeze thawing model casing includes refrigerating chamber 1 and soil sample chamber
2。
Referring to Fig. 2 and Fig. 3, the soil sample chamber 2 is the open rectangular box in upper end.The soil sample chamber 2 is by metal heat-conducting material
Material is made.Temperature sensor is equipped with the bottom of the soil sample chamber 2 and inwall.The refrigerating chamber 1 is the rectangle with top cover 101
Casing.The refrigerating chamber 1 is made up of heat-barrier material.
The soil sample chamber 2 is arranged in the inner chamber of refrigerating chamber 1.The bottom of the soil sample chamber 2 is fixed with the bottom of refrigerating chamber 1 and is connected
Connect.Space S is formed between the refrigerating chamber 1 and soil sample chamber 2.Freezing liquid 7 is marked with the space S.The refrigerating chamber 1 is by gold
Category cooling tube 12 is connected with kind of refrigeration cycle instrument 10.During experiment, freezing liquid 7 is circulated between space S and kind of refrigeration cycle instrument 10,
Freeze cold to provide in space S.
What deserves to be explained is, in the present embodiment, the length of soil sample chamber 2 is 500mm, and width is 400mm, is highly 600mm,
Wall thickness is 10mm.The length of refrigerating chamber 1 is 900mm, and width is 900mmmm, is highly 800mm, and wall thickness is 10mm.Kind of refrigeration cycle instrument
10 temperature-control range is between -20 DEG C~80 DEG C.
Embodiment 4：
The present embodiment discloses a kind of on simulating the piling process Particle Breakage experiment of calcareous sand ground described in embodiment 1 or 2
The test method of model equipment, comprises the following steps：
1) according to predetermined level is with preparation calcareous sand and is well mixed.
2) calcareous sand soil sample is loaded in soil sample chamber 2 using sand rain method, and appropriate water shape is poured into according to required saturation degree
Into calcareous sand soil layer 3.Wherein, the packed height of calcareous sand soil sample 3 is 300~500mm.
3) perpendicularity of Model Pile 5 is adjusted, Model Pile 5 is fixed on the lower end of pile sinking loading device 8.
4) start-up loading device, is pressed into the set depth of calcareous sand soil layer 3 by Model Pile 5 as requested.
5) cover plate 101 of refrigerating chamber 1 is covered, it is -10 DEG C to set kind of refrigeration cycle instrument temperature, starts kind of refrigeration cycle instrument until soil
Temperature sensor temperature stabilization in specimen chamber 2 and Model Pile 5 is to setting value.
6) kind of refrigeration cycle instrument is closed, the cover plate of refrigerating chamber 1 is opened, piles with different footpath and stake bottom scope is taken out with soil sampler 4
Calcareous sand soil sample, measures the volume and quality of soil sample, soil sample then is put into baking oven and is toasted 24 hours at 60 DEG C.Wherein, institute
Soil sampler 4 is stated for square soil sampler.Referring to Fig. 6, the square soil sampler is the open hollow cuboid of upper and lower side.This length
Cube 100mm long, 70mm wide, 200mm high.The hollow cuboid upper and lower side open-mouth is respectively provided with sharp metal cutter.
7) after soil sample drying, a separating tests is carried out by oscillating sieving machine, can obtain calcareous sand at piles with different footpath point
Curve.
Embodiment 5：
The present embodiment discloses a kind of on simulating the piling process Particle Breakage experiment of calcareous sand ground described in embodiment 1 or 2
The test method of model equipment, comprises the following steps：
1) according to predetermined level is with preparation calcareous sand and is well mixed.
2) calcareous sand soil sample is loaded in soil sample chamber 2 using sand rain method, and appropriate water shape is poured into according to required saturation degree
Into calcareous sand soil layer 3.Wherein, the packed height of calcareous sand soil sample 3 is 300~500mm.
3) perpendicularity of Model Pile 5 is adjusted, Model Pile 5 is fixed on the lower end of pile sinking loading device 8.
4) start-up loading device, is pressed into the set depth of calcareous sand soil layer 3 by Model Pile 5 as requested.
5) cover plate 101 of refrigerating chamber 1 is covered, it is -10 DEG C to set kind of refrigeration cycle instrument temperature, starts kind of refrigeration cycle instrument until soil
Temperature sensor temperature stabilization in specimen chamber 2 and Model Pile 5 is to setting value.
6) kind of refrigeration cycle instrument is closed, the cover plate of refrigerating chamber 1 is opened, piles with different footpath and stake bottom scope is taken out with soil sampler 4
Calcareous sand soil sample, measures the volume and quality of soil sample, soil sample then is put into baking oven and is toasted 24 hours at 60 DEG C.Wherein, institute
It is circular soil sampler to state soil sampler.Referring to Fig. 5, the circular soil sampler is the open hollow circular cylinder of upper and lower side.In this
The internal diameter of hollow cylinder is 39.1mm, is highly 80mm.The hollow circular cylinder upper and lower side open-mouth is respectively provided with sharp metal
Cutting knife.
7) after soil sample drying, a separating tests is carried out by oscillating sieving machine, can obtain calcareous sand at piles with different footpath point
Curve.
Embodiment 6：
The present embodiment discloses a kind of on simulating calcareous sand ground piling process Particle Breakage test model described in embodiment 3
The test method of device, comprises the following steps：
1) according to predetermined level is with preparation calcareous sand and is well mixed.
2) calcareous sand soil sample is loaded in soil sample chamber 2 using sand rain method, and appropriate water shape is poured into according to required saturation degree
Into calcareous sand soil layer 3.Wherein, the packed height of calcareous sand soil sample 3 is 300~500mm.
3) during Model Pile 5 to be inserted the preformed hole of the lower end screw-cap 6 of pile sinking loading device 8, after the adjustment perpendicularity of Model Pile 5
Model Pile 5 is fixed by bolt.
4) start-up loading device, is pressed into the set depth of calcareous sand soil layer 3 by Model Pile 5 as requested.
5) cover plate 101 of refrigerating chamber 1 is covered, it is -10 DEG C to set kind of refrigeration cycle instrument temperature, starts kind of refrigeration cycle instrument until soil
Temperature sensor temperature stabilization in specimen chamber 2 and Model Pile 5 is to setting value.
6) kind of refrigeration cycle instrument is closed, the cover plate of refrigerating chamber 1 is opened, piles with different footpath and stake bottom scope is taken out with soil sampler 4
Calcareous sand soil sample, measures the volume and quality of soil sample, soil sample then is put into baking oven and is toasted 24 hours at 60 DEG C.
7) after soil sample drying, a separating tests is carried out by oscillating sieving machine, can obtain calcareous sand at piles with different footpath point
Curve.
Claims (9)
1. it is a kind of to simulate calcareous sand ground piling process Particle Breakage pilot model apparatus, it is characterised in that including being fixed on reality
The reaction frame (9) and freeze thawing model casing tested on platform (11)；
The lower surface of reaction frame (9) top cross-bar is provided with pile sinking loading device (8)；Under the pile sinking loading device (8)
End can be connected with Model Pile (5), drive Model Pile (5) along lengthwise movement；Temperature sensor is provided with the Model Pile (5)；
The freeze thawing model casing is arranged in area of reaction frame (9) test center；The freeze thawing model casing includes refrigerating chamber (1) and soil sample
Room (2)；
The soil sample chamber (2) is the open rectangular box in upper end；The soil sample chamber (2) is made up of metal heat-conducting material；The soil
Temperature sensor is equipped with specimen chamber (2) bottom and inwall；The refrigerating chamber (1) is the rectangular box with top cover (101)；Institute
Refrigerating chamber (1) is stated to be made up of heat-barrier material；
The soil sample chamber (2) is arranged in the inner chamber of refrigerating chamber (1)；Soil sample chamber (2) bottom is fixed with refrigerating chamber (1) bottom
Connection；Space (S) is formed between the refrigerating chamber (1) and soil sample chamber (2)；Freezing liquid (7) is marked with the space (S)；It is described
Refrigerating chamber (1) is connected by metal cooling-pipe (12) with kind of refrigeration cycle instrument (10)；During experiment, freezing liquid (7) is in space (S) and system
SAPMAC method instrument is circulated between (10).
2. it is a kind of to simulate calcareous sand ground piling process Particle Breakage pilot model apparatus, it is characterised in that including being fixed on reality
The reaction frame (9) and freeze thawing model casing tested on platform (11)；
The lower surface of reaction frame (9) top cross-bar is provided with pile sinking loading device (8)；Under the pile sinking loading device (8)
End can be connected with Model Pile (5), drive Model Pile (5) along lengthwise movement；Temperature sensor is provided with the Model Pile (5)；
The freeze thawing model casing is arranged in area of reaction frame (9) test center；The freeze thawing model casing include the refrigerating chamber (1) and
The soil sample chamber (2)；
The soil sample chamber (2) is for upper end is open and interior hollow staving；The soil sample chamber (2) is made up of metal heat-conducting material；Institute
State and be equipped with temperature sensor on soil sample chamber (2) bottom and inwall；The refrigerating chamber (1) is the Hollow barrel with top cover (101)
Body；The refrigerating chamber (1) is made up of heat-barrier material；
The soil sample chamber (2) is arranged in the inner chamber of refrigerating chamber (1)；Soil sample chamber (2) bottom is fixed with refrigerating chamber (1) bottom
Connection.Space (S) is formed between the refrigerating chamber (1) and soil sample chamber (2)；Freezing liquid (7) is marked with the space (S)；It is described
Refrigerating chamber (1) is connected by metal cooling-pipe (12) with kind of refrigeration cycle instrument (10)；During experiment, freezing liquid (7) is in space (S) and system
SAPMAC method instrument is circulated between (10).
3. one kind according to claim 1 and 2 simulates calcareous sand ground piling process Particle Breakage pilot model apparatus, its
It is characterised by：The pile sinking loading device (8) includes electric loading system device (801), drive link (802) and Model Pile erecting bed
(803)；Wherein, the drive link (802) is arranged on electric loading system device (801) lower section, and Model Pile erecting bed (803) is arranged on
Drive link (802) lower end；There is air level (8031) on the Model Pile erecting bed (803)；The Model Pile erecting bed (803)
Lower surface is fixed with fixed screw-cap (8032)；In the reserved model stake holes of the fixed screw-cap (8032) of Model Pile (5) insertion, and
It is bolted on Model Pile erecting bed (803) by tightening；During experiment, electric loading system device (801) drives drive link (802)
Along lengthwise movement, Model Pile (5) motion is then driven.
4. the one kind according to claim 1,2 or 3 simulates calcareous sand ground piling process Particle Breakage pilot model apparatus,
It is characterized in that：The stake footpath of the Model Pile (5) is 10mm~30mm, and length is 100~300mm；The kind of refrigeration cycle instrument
(10) temperature-control range is between -20 DEG C~80 DEG C.
5. one kind according to claim 1 simulates calcareous sand ground piling process Particle Breakage pilot model apparatus, and it is special
Levy and be：The length of the soil sample chamber (2) is a, and width is b, is highly c, and wall thickness is d；Wherein, a=400~600mm, b=
400~600mm, c=500~700mm, d=5~10mm；Refrigerating chamber (1) length is 900mm, and width is 900mmmm, high
It is 800mm to spend, and wall thickness is 10mm.
6. one kind according to claim 1 and 2 simulates calcareous sand ground piling process Particle Breakage pilot model apparatus, its
It is characterised by：The soil sample chamber (2) and the reserved screw of refrigerating chamber (1) bottom correspondence position；The soil sample chamber (2) and refrigerating chamber
(1) it is bolted to connection.
7. a kind of examination on simulating calcareous sand ground piling process Particle Breakage pilot model apparatus described in claim 1 or 2
Proved recipe method, it is characterised in that：Comprise the following steps：
1) according to predetermined level is with preparation calcareous sand and is well mixed；
2) calcareous sand soil sample is loaded in soil sample chamber (2) using sand rain method, and appropriate water is poured into according to required saturation degree and formed
Calcareous sand soil layer (3)；Wherein, the packed height of calcareous sand soil sample (3) is 300~500mm；
3) perpendicularity of adjustment Model Pile (5), Model Pile (5) is fixed on the lower end of pile sinking loading device (8)；
4) start-up loading device, is pressed into calcareous sand soil layer (3) set depth by Model Pile (5) as requested；
5) cover plate (101) of refrigerating chamber (1) is covered, it is -10 DEG C to set kind of refrigeration cycle instrument temperature, starts kind of refrigeration cycle instrument until soil
Temperature sensor temperature stabilization in specimen chamber (2) and Model Pile (5) is to setting value；
6) kind of refrigeration cycle instrument is closed, the cover plate of refrigerating chamber (1) is opened, piles with different footpath and stake bottom scope is taken out with soil sampler (4)
Calcareous sand soil sample, measures the volume and quality of soil sample, soil sample then is put into baking oven and is toasted 24 hours at 60 DEG C；
7) after soil sample drying, a separating tests is carried out by oscillating sieving machine, can obtain a component curve of calcareous sand at piles with different footpath.
8. a kind of test method according to claim 7, it is characterised in that：The soil sampler (4) is square soil sampler；Institute
It is the open hollow cuboid of upper and lower side to state square soil sampler；This cuboid 20~150mm long, 20~150mm wide are high
100~600mm；The hollow cuboid upper and lower side open-mouth is respectively provided with sharp metal cutter.
9. a kind of test method according to claim 7, it is characterised in that：The soil sampler is circular soil sampler；It is described
Circular soil sampler is the open hollow circular cylinder of upper and lower side；The internal diameter of this hollow circular cylinder is 39.1~50.1mm, height
It is 80~100mm；The hollow circular cylinder upper and lower side open-mouth is respectively provided with sharp metal cutter.
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