CN106759552B - A kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and its test method - Google Patents

A kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and its test method Download PDF

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CN106759552B
CN106759552B CN201710052465.5A CN201710052465A CN106759552B CN 106759552 B CN106759552 B CN 106759552B CN 201710052465 A CN201710052465 A CN 201710052465A CN 106759552 B CN106759552 B CN 106759552B
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soil sample
pile
model
soil
chamber
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CN106759552A (en
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肖鹏
肖杨
向佳
冉进瑜
何想
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Chongqing University
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Chongqing University
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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 and drives piles process Particle Breakage pilot model apparatus and its test method.The device includes freeze thawing model casing, refrigeration cycle instrument, pile sinking loading device and reaction frame.Freeze thawing model casing includes freezing chamber and soil sample chamber.Soil sample chamber is bolted on inside freezing chamber.Test method using the device includes model casing dress sample, pile sinking load, soil sample freezing, sampling is thawed and Parameter analysis.The present invention can simulate calcareous sand ground in the Particle Breakage process at soil compaction during pile driving or drive piles process stake bottom and pile peripheral earth, and well obtain soil around pile sample, can study malm by after soil compaction effect Particle Breakage, variable density, gradation develop etc. rules.

Description

A kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and its examination Proved recipe method
Technical field
The present invention relates to civil engineering experimental technique field more particularly to a kind of simulation calcareous sand ground piling process particles Crushing test model equipment and its test method.
Background technique
China is just built at the Efforts To Develop South Sea, actively realizes the strategic objective of " construction ocean power ", and calcareous sand is A kind of subsoil soil being distributed widely in China South Sea region, it is by a kind of marine organisms origin cause of formation, internal porous gap, shape Therefore irregular Special Rock medium helps speed up the process of South Sea construction to the research of calcareous sand, have very great Strategic importance.Pile foundation is common method for processing foundation in engineering construction, with bearing capacity height, convenient, cost of constructing Low series of advantages.However due to calcareous sand itself have easily occur Particle Breakage characteristic, South Sea calcareous sand area into Row pile foundation engineering construction, especially during prefabricated pile is driven piles, since Impact Load or soil compaction effect make stake all Particle Breakage occurs for the soil body, and the Particle Breakage of the soil body will change the gradation of the soil body, the compactness of the soil body, to further influence stake Therefore the bearing capacity of base measures the Particle Breakage situation of prefabricated pile pile peripheral earth during piling in calcareous sand ground 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 It studies less, Particle Breakage caused by pile-soil interaction is more studied without special experimental rig.Therefore, empty to fill up this It is white, it develops a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus and test method becomes and do not allow at a quarter Slow work.
Summary of the invention
Present invention aim to address can not measure prefabricated pile in piling process in the pile foundation process of construction of calcareous sand ground The problem of pile peripheral earth Particle Breakage situation, provides a kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus And test method.
To realize the present invention purpose and the technical solution adopted is that such, a kind of simulation calcareous sand ground is driven piles process Grain crushing test model equipment, including the reaction frame and freeze thawing model casing being fixed on experimental bench.
The lower surface of the reaction frame top cross-bar is provided with pile sinking loading device.Pile sinking loading device lower end can be with Model Pile is connected, and Model Pile is driven to move along longitudinal direction.Temperature sensor is provided in the Model Pile.
The freeze thawing model casing is arranged in area of reaction frame test center.The freeze thawing model casing includes freezing chamber and soil sample Room.
The soil sample chamber is the rectangular box of upper end opening.The soil sample chamber is made of metal thermal conductive material.The soil sample Temperature sensor is equipped on room bottom and inner wall.The freezing chamber is the rectangular box with top cover.The freezing chamber by every Hot material is made.
The soil sample chamber is arranged in the inner cavity of freezing chamber.The soil sample chamber bottom is fixedly connected with freezing chamber bottom.Institute It states and forms space S between freezing chamber and soil sample chamber.Freezing liquid is marked in the space S.The freezing chamber passes through metal cooling-pipe It is connected to refrigeration cycle instrument.When test, freezing liquid circulates between space S and refrigeration cycle instrument.
A kind of simulation calcareous sand ground piling process Particle Breakage pilot model apparatus, which is characterized 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.Pile sinking loading device lower end can be with Model Pile is connected, and Model Pile is driven to move along longitudinal direction.Temperature sensor is provided in the Model Pile.
The freeze thawing model casing is arranged in area of reaction frame test center.The freeze thawing model casing includes freezing chamber and soil sample Room.
The soil sample chamber is upper end opening and interior hollow staving.The soil sample chamber is made of metal thermal conductive material.It is described Temperature sensor is equipped on soil sample chamber bottom and inner wall.The freezing chamber is the hollow staving with top cover.The freezing chamber It is made of heat-barrier material.
The soil sample chamber is arranged in the inner cavity of freezing chamber.The soil sample chamber bottom is fixedly connected with freezing chamber bottom.Institute It states and forms space S between freezing chamber and soil sample chamber.Freezing liquid is marked in the space S.The freezing chamber passes through metal cooling-pipe It is connected to refrigeration cycle instrument.When test, freezing liquid circulates between space S and refrigeration cycle instrument.
Further, the pile sinking loading device includes electric loading system device, drive rod and Model Pile erecting bed.Wherein, institute It states drive rod to be arranged below electric loading system device, Model Pile erecting bed is arranged in drive rod lower end.The Model Pile erecting bed It is upper that there is air level.Model Pile erecting bed lower surface has fixed screw-cap.When test, Model Pile is inserted into fixed screw-cap In reserved model stake holes, and it is fixed on Model Pile erecting bed by tightening bolt.Electric loading system device drives drive rod edge Longitudinal movement then drives Model Pile movement.
Further, the stake diameter of the Model Pile is 10mm~30mm, and length is 100~300mm；The refrigeration cycle instrument Temperature-control range is between -20 DEG C~80 DEG C.
Further, the length of the soil sample chamber is a, width b, is highly c, wall thickness d.Wherein, a=400~ 600mm, b=400~600mm, c=500~700mm, d=5~10mm.The freezing chamber length is 900mm, and width is 900mmmm is highly 800mm, wall thickness 10mm.
Further, the soil sample chamber and freezing chamber bottom corresponding position reserve screw hole.The soil sample chamber and freezing chamber pass through Bolt is fixedly connected.
Invention additionally discloses a kind of about above-mentioned simulation calcareous sand ground piling process Particle Breakage pilot model apparatus Test method, comprising the following steps:
1) it with preparation calcareous sand and is uniformly mixed according to predetermined level.
2) calcareous sand soil sample is packed into soil sample chamber using sand rain method, and suitable water is poured into according to required saturation degree and is 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) Model Pile is pressed into calcareous sand soil layer set depth as requested by start-up loading device.
5) cover board for covering freezing chamber sets refrigeration cycle instrument temperature as -10 DEG C, and starting refrigeration cycle instrument is until soil sample chamber Setting value is stabilized to the temperature sensor temperature in Model Pile.
6) refrigeration cycle instrument is closed, the cover board of freezing chamber is opened, the calcium of piles with different diameter and stake bottom range is taken out with soil sampler Matter sand sample measures the volume and quality of soil sample, and soil sample is then put into baking oven at 60 DEG C and is toasted 24 hours.
7) after soil sample drying, separating tests are carried out by oscillating sieving machine, can be obtained calcareous sand at piles with different diameter point Curve.
Further, the soil sampler is rectangular soil sampler.The rectangular soil sampler is the hollow rectangular of upper and lower side opening Body.This cuboid grows 20~150mm, wide 20~150mm, high 100~600mm.The hollow cuboid upper and lower side open-mouth All have sharp metal cutter.
Further, the soil sampler is round soil sampler.The circle soil sampler is the open hollow circuit cylinder of upper and lower side Body.The internal diameter of this hollow cylinder is 39.1~50.1mm, is highly 80~100mm.The hollow cylinder upper and lower side is spacious Sharp metal cutter is all had at 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, pass through system SAPMAC method instrument freezes soil sample to obtaining complete calcareous sand soil sample, is subjected to pile foundation treated that particle is broken to study calcareous Flooding in Borehole Broken situation, gradation develops and variable density, effective solution calcareous sand ground piling pile week and stake the ground soil body Experimental study on particle breakage problem；
B. this model equipment can be used cooperatively different soil samplers, can be very good to obtain the calcareous sand at piles with different diameter Sample, to preferably study the Particle Breakage of calcareous Flooding in Borehole with the situation of change of stake diameter；
C. this model equipment simulates different compactness, different saturation calcareous sand ground, different-diameter, difference as needed Pile-type and different pile sinking loading speeds can be provided, applicability is wide.
Detailed description of the invention
Fig. 1 is model equipment structural schematic diagram；
Fig. 2 is freeze thawing model casing operation schematic diagram；
Fig. 3 is freeze thawing mold box configuration schematic diagram；
Fig. 4 is heavy dress loading device structural schematic diagram；
Fig. 5 is rectangular sampler structure schematic diagram；
Fig. 6 is round sampler structure schematic diagram.
In figure: space S, freezing chamber 1, top cover 101, soil sample chamber 2, calcareous sand soil layer 3, soil sampler 4, Model Pile 5, freezing liquid 7, pile sinking loading device 8, electric loading system device 801, drive rod 802, Model Pile erecting bed 803, air level 8031, fixed spiral Cap 8032, reaction frame 9, refrigeration cycle instrument 10, experimental bench 11, metal cooling-pipe 12.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present 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, should all include 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 are fixed on Reaction frame 9 and freeze thawing model casing on experimental bench 11.
Referring to Fig. 1, the lower surface of 9 top cross-bar of reaction frame is provided with pile sinking loading device 8.The pile sinking load dress Setting 8 lower ends can be connected with Model Pile 5, and Model Pile 5 is driven to move along longitudinal direction.The pile sinking loading device 8 can provide constant add Rate and constant pressure are carried, with simulation knocking pile sinking and static pressure pile-sinking.Temperature sensor is provided in the Model Pile 5.
The freeze thawing model casing is arranged in 9 area of test center of reaction frame, i.e. freeze thawing model casing is placed on pile sinking loading device 8 Lower section, and freeze thawing model casing is aligned with 8 center of pile sinking loading device.The freeze thawing model casing includes freezing chamber 1 and soil sample chamber 2。
Referring to figs. 2 and 3, the soil sample chamber 2 is upper end opening and interior hollow rectangular box.The soil sample chamber 2 is by gold Belong to Heat Conduction Material to be made.Temperature sensor is equipped on 2 bottom of soil sample chamber and inner wall.The freezing chamber 1 is with top cover 101 hollow, rectangular cabinet.The freezing chamber 1 is made of heat-barrier material.
The soil sample chamber 2 is arranged in the inner cavity of freezing chamber 1.The soil sample chamber 2 and 1 bottom corresponding position of freezing chamber are reserved Screw hole.The soil sample chamber 2 and freezing chamber 1 are bolted to connection.Space S is formed between the freezing chamber 1 and soil sample chamber 2. Freezing liquid 7 is marked in the space S.The freezing chamber 1 is connected to by metal cooling-pipe 12 with refrigeration cycle instrument 10.When test, Freezing liquid 7 circulates between space S and refrigeration cycle instrument 10, freezes cooling capacity 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 are fixed on Reaction frame 9 and freeze thawing model casing on experimental bench 11.
The lower surface of 9 top cross-bar of reaction frame is provided with pile sinking loading device 8.8 lower end of pile sinking loading device It can be connected with Model Pile 5, Model Pile 5 is driven to move along longitudinal direction.The pile sinking loading device 8 can provide constant loading speed and Constant pressure, with simulation knocking pile sinking and static pressure pile-sinking.Temperature sensor is provided in the Model Pile 5.
The freeze thawing model casing is arranged in 9 area of test center of reaction frame, i.e. freeze thawing model casing is placed on pile sinking loading device 8 Lower section, and freeze thawing model casing is aligned with 8 center of pile sinking loading device.The freeze thawing model casing includes freezing chamber 1 and soil sample chamber 2。
The soil sample chamber 2 is upper end opening and interior hollow staving.The soil sample chamber 2 is made of metal thermal conductive material.Institute It states and is equipped with temperature sensor on 2 bottom of soil sample chamber and inner wall.The freezing chamber 1 is the hollow staving with top cover 101.It is described Freezing chamber 1 is made of heat-barrier material.
The soil sample chamber 2 is arranged in the inner cavity of freezing chamber 1.The soil sample chamber 2 and 1 bottom corresponding position of freezing chamber are reserved Screw hole.The soil sample chamber 2 and freezing chamber 1 are bolted to connection.Space S is formed between the freezing chamber 1 and soil sample chamber 2. Freezing liquid 7 is marked in the space S.The freezing chamber 1 is connected to by metal cooling-pipe 12 with refrigeration cycle instrument 10.When test, Freezing liquid 7 circulates between space S and refrigeration cycle instrument 10, freezes cooling capacity 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 are fixed on Reaction frame 9 and freeze thawing model casing on experimental bench 11.
Referring to Fig. 1, the lower surface of 9 top cross-bar of reaction frame 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 rod 802 and Model Pile erecting bed 803.Wherein, the drive rod 802 is arranged below electric loading system device 801, and Model Pile erecting bed 803 is arranged in drive rod 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.803 lower surface of Model Pile erecting bed has fixed screw-cap 8032.Model Pile 5 is inserted Enter in the reserved model stake holes of fixed screw-cap 8032, and is fixed on Model Pile erecting bed 803 by tightening bolt.The mould Also there is air level 8031, to guarantee the verticality of Model Pile pile sinking on type stake erecting bed 803.The stake diameter of the Model Pile 5 is 10mm, length 100mm.Temperature sensor is provided in the Model Pile 5.When test, the driving transmission of electric loading system device 801 Bar 802 moves along longitudinal direction, then Model Pile 5 is driven to move along longitudinal direction.
The freeze thawing model casing is arranged in 9 area of test center of reaction frame, i.e. freeze thawing model casing is placed on pile sinking loading device 8 Lower section, and freeze thawing model casing is aligned with 8 center of pile sinking loading device.The freeze thawing model casing includes freezing chamber 1 and soil sample chamber 2。
Referring to figs. 2 and 3, the soil sample chamber 2 is the rectangular box of upper end opening.The soil sample chamber 2 is by metal heat-conducting material Material is made.Temperature sensor is equipped on 2 bottom of soil sample chamber and inner wall.The freezing chamber 1 is the rectangle with top cover 101 Cabinet.The freezing chamber 1 is made of heat-barrier material.
The soil sample chamber 2 is arranged in the inner cavity of freezing chamber 1.The fixed company in 2 bottom of soil sample chamber and 1 bottom of freezing chamber It connects.Space S is formed between the freezing chamber 1 and soil sample chamber 2.Freezing liquid 7 is marked in the space S.The freezing chamber 1 passes through gold Belong to cooling tube 12 to be connected to refrigeration cycle instrument 10.When test, freezing liquid 7 circulates between space S and refrigeration cycle instrument 10, Freeze cooling capacity to provide in space S.
It is worth noting that it is highly 600mm that the length of soil sample chamber 2, which is 500mm, width 400mm, in the present embodiment, Wall thickness is 10mm.1 length of freezing chamber is 900mm, width 900mmmm, is highly 800mm, wall thickness 10mm.Refrigeration cycle instrument 10 temperature-control range is between -20 DEG C~80 DEG C.
Embodiment 4:
The present embodiment discloses a kind of about the simulation calcareous sand ground piling process Particle Breakage test of embodiment 1 or 2 The test method of model equipment, comprising the following steps:
1) it with preparation calcareous sand and is uniformly mixed according to predetermined level.
2) calcareous sand soil sample is packed into soil sample chamber 2 using sand rain method, and suitable water shape is poured into according to required saturation degree At calcareous sand soil layer 3.Wherein, the packed height of calcareous sand soil sample 3 is 300~500mm.
3) Model Pile 5, is fixed on the lower end of pile sinking loading device 8 by the verticality for adjusting Model Pile 5.
4) Model Pile 5 is pressed into 3 set depth of calcareous sand soil layer as requested by start-up loading device.
5) cover board 101 for covering freezing chamber 1 sets refrigeration cycle instrument temperature as -10 DEG C, and starting refrigeration cycle instrument is until soil Temperature sensor temperature in specimen chamber 2 and Model Pile 5 is stabilized to setting value.
6) refrigeration cycle instrument is closed, the cover board of freezing chamber 1 is opened, takes out piles with different diameter and stake bottom range with soil sampler 4 Calcareous sand soil sample measures the volume and quality of soil sample, and soil sample is then put into baking oven at 60 DEG C and is toasted 24 hours.Wherein, institute Stating soil sampler 4 is rectangular soil sampler.Referring to Fig. 6, the rectangular soil sampler is the open hollow cuboid of upper and lower side.This length Cube long 100mm, wide 70mm, high 200mm.The hollow cuboid upper and lower side open-mouth all has sharp metal cutter.
7) after soil sample drying, separating tests are carried out by oscillating sieving machine, can be obtained calcareous sand at piles with different diameter point Curve.
Embodiment 5:
The present embodiment discloses a kind of about the simulation calcareous sand ground piling process Particle Breakage test of embodiment 1 or 2 The test method of model equipment, comprising the following steps:
1) it with preparation calcareous sand and is uniformly mixed according to predetermined level.
2) calcareous sand soil sample is packed into soil sample chamber 2 using sand rain method, and suitable water shape is poured into according to required saturation degree At calcareous sand soil layer 3.Wherein, the packed height of calcareous sand soil sample 3 is 300~500mm.
3) Model Pile 5, is fixed on the lower end of pile sinking loading device 8 by the verticality for adjusting Model Pile 5.
4) Model Pile 5 is pressed into 3 set depth of calcareous sand soil layer as requested by start-up loading device.
5) cover board 101 for covering freezing chamber 1 sets refrigeration cycle instrument temperature as -10 DEG C, and starting refrigeration cycle instrument is until soil Temperature sensor temperature in specimen chamber 2 and Model Pile 5 is stabilized to setting value.
6) refrigeration cycle instrument is closed, the cover board of freezing chamber 1 is opened, takes out piles with different diameter and stake bottom range with soil sampler 4 Calcareous sand soil sample measures the volume and quality of soil sample, and soil sample is then put into baking oven at 60 DEG C and is toasted 24 hours.Wherein, institute Soil sampler is stated as round soil sampler.Referring to Fig. 5, the circle soil sampler is the open hollow cylinder of upper and lower side.In this The internal diameter of hollow cylinder is 39.1mm, is highly 80mm.The hollow cylinder upper and lower side open-mouth all has sharp metal Cutter.
7) after soil sample drying, separating tests are carried out by oscillating sieving machine, can be obtained calcareous sand at piles with different diameter point Curve.
Embodiment 6:
The present embodiment discloses one kind simulation calcareous sand ground piling process Particle Breakage test model described in embodiment 3 The test method of device, comprising the following steps:
1) it with preparation calcareous sand and is uniformly mixed according to predetermined level.
2) calcareous sand soil sample is packed into soil sample chamber 2 using sand rain method, and suitable water shape is poured into according to required saturation degree At calcareous sand soil layer 3.Wherein, the packed height of calcareous sand soil sample 3 is 300~500mm.
3) Model Pile 5 is inserted into the preformed hole of 8 lower end screw-cap 6 of pile sinking loading device, after adjusting 5 verticality of Model Pile It is by bolt that Model Pile 5 is fixed.
4) Model Pile 5 is pressed into 3 set depth of calcareous sand soil layer as requested by start-up loading device.
5) cover board 101 for covering freezing chamber 1 sets refrigeration cycle instrument temperature as -10 DEG C, and starting refrigeration cycle instrument is until soil Temperature sensor temperature in specimen chamber 2 and Model Pile 5 is stabilized to setting value.
6) refrigeration cycle instrument is closed, the cover board of freezing chamber 1 is opened, takes out piles with different diameter and stake bottom range with soil sampler 4 Calcareous sand soil sample measures the volume and quality of soil sample, and soil sample is then put into baking oven at 60 DEG C and is toasted 24 hours.
7) after soil sample drying, separating tests are carried out by oscillating sieving machine, can be obtained calcareous sand at piles with different diameter point Curve.

Claims (9)

  1. The process Particle Breakage pilot model apparatus 1. a kind of simulation calcareous sand ground is driven piles, which is characterized in that including being fixed on reality Test reaction frame (9) and the freeze thawing model casing 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), and Model Pile (5) is driven to move along longitudinal direction；Temperature sensor is provided in 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 freezing chamber (1) and soil sample Room (2)；
    The soil sample chamber (2) is the rectangular box of upper end opening；The soil sample chamber (2) is made of metal thermal conductive material；The soil Temperature sensor is equipped on specimen chamber (2) bottom and inner wall；The freezing chamber (1) is the rectangular box with top cover (101)；Institute Freezing chamber (1) is stated to be made of heat-barrier material；
    The soil sample chamber (2) is arranged in the inner cavity of freezing chamber (1)；Soil sample chamber (2) bottom is fixed with freezing chamber (1) bottom Connection；Space (S) is formed between the freezing chamber (1) and soil sample chamber (2)；Freezing liquid (7) are marked in the space (S)；It is described Freezing chamber (1) is connected to by metal cooling-pipe (12) with refrigeration cycle instrument (10)；When test, freezing liquid (7) is in space (S) and system SAPMAC method instrument circulates between (10).
  2. The process Particle Breakage pilot model apparatus 2. a kind of simulation calcareous sand ground is driven piles, which is characterized in that including being fixed on reality Test reaction frame (9) and the freeze thawing model casing 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), and Model Pile (5) is driven to move along longitudinal direction；Temperature sensor is provided in 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 freezing chamber (1) and soil sample Room (2)；
    The soil sample chamber (2) is upper end opening and interior hollow staving；The soil sample chamber (2) is made of metal thermal conductive material；Institute It states and is equipped with temperature sensor on soil sample chamber (2) bottom and inner wall；The freezing chamber (1) is the Hollow barrel with top cover (101) Body；The freezing chamber (1) is made of heat-barrier material；
    The soil sample chamber (2) is arranged in the inner cavity of freezing chamber (1)；Soil sample chamber (2) bottom is fixed with freezing chamber (1) bottom Connection；Space (S) is formed between the freezing chamber (1) and soil sample chamber (2)；Freezing liquid (7) are marked in the space (S)；It is described Freezing chamber (1) is connected to by metal cooling-pipe (12) with refrigeration cycle instrument (10)；When test, freezing liquid (7) is in space (S) and system SAPMAC method instrument circulates between (10).
  3. The process Particle Breakage pilot model apparatus 3. a kind of simulation calcareous sand ground according to claim 1 or 2 is driven piles, Be characterized in that: the pile sinking loading device (8) includes electric loading system device (801), drive rod (802) and Model Pile erecting bed (803)；Wherein, below electric loading system device (801), Model Pile erecting bed (803) setting exists for drive rod (802) setting Drive rod (802) lower end；There are 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)；Model Pile (5) is inserted into fixed screw-cap (8032) reserved model stake holes, and It is fixed on Model Pile erecting bed (803) by tightening bolt；When test, electric loading system device (801) drives drive rod (802) It moves along longitudinal direction, then drives Model Pile (5) movement.
  4. The process Particle Breakage pilot model apparatus 4. a kind of simulation calcareous sand ground according to claim 1 is driven piles, it is special Sign is: the stake diameter of the Model Pile (5) is 10mm~30mm, and length is 100~300mm；The refrigeration cycle instrument (10) Temperature-control range is between -20 DEG C~80 DEG C.
  5. The process Particle Breakage pilot model apparatus 5. a kind of simulation calcareous sand ground according to claim 1 is driven piles, it is special Sign is: the length of the soil sample chamber (2) is a, width b, is highly c, wall thickness d；Wherein, a=400~600mm, b= 400~600mm, c=500~700mm, d=5~10mm；Freezing chamber (1) length is 900mm, width 900mmmm, height Degree is 800mm, wall thickness 10mm.
  6. The process Particle Breakage pilot model apparatus 6. a kind of simulation calcareous sand ground according to claim 1 or 2 is driven piles, Be characterized in that: the soil sample chamber (2) and freezing chamber (1) bottom corresponding position reserve screw hole；The soil sample chamber (2) and freezing chamber (1) it is bolted to connection.
  7. 7. a kind of examination about simulation calcareous sand ground piling process Particle Breakage pilot model apparatus as claimed in claim 1 or 2 Proved recipe method, it is characterised in that: the following steps are included:
    1) it with preparation calcareous sand and is uniformly mixed according to predetermined level；
    2) calcareous sand soil sample is packed into soil sample chamber (2) using sand rain method, and suitable water is poured into according to required saturation degree and is formed Calcareous sand soil layer (3)；Wherein, the packed height of calcareous sand soil sample (3) is 300~500mm；
    3) Model Pile (5), is fixed on the lower end of pile sinking loading device (8) by the verticality for adjusting Model Pile (5)；
    4) Model Pile (5) are pressed into calcareous sand soil layer (3) set depth as requested by start-up loading device；
    5) cover board (101) for covering freezing chamber (1) sets refrigeration cycle instrument temperature as -10 DEG C, and starting refrigeration cycle instrument is until soil Temperature sensor temperature in specimen chamber (2) and Model Pile (5) is stabilized to setting value；
    6) refrigeration cycle instrument is closed, the cover board of freezing chamber (1) is opened, takes out piles with different diameter and stake bottom range with soil sampler (4) Calcareous sand soil sample measures the volume and quality of soil sample, and soil sample is then put into baking oven at 60 DEG C and is toasted 24 hours；
    7) after soil sample drying, separating tests is carried out by oscillating sieving machine, the component curve of calcareous sand at piles with different diameter can be obtained.
  8. 8. a kind of test method according to claim 7, it is characterised in that: the soil sampler (4) is rectangular soil sampler；Institute Stating rectangular soil sampler is the open hollow cuboid of upper and lower side；This cuboid grows 20~150mm, wide 20~150mm, high 100~600mm；The hollow cuboid upper and lower side open-mouth all has sharp metal cutter.
  9. 9. a kind of test method according to claim 7, it is characterised in that: the soil sampler is round soil sampler；It is described Round soil sampler is the open hollow cylinder of upper and lower side；The internal diameter of this hollow cylinder is 39.1~50.1mm, height For 80~100mm；The hollow cylinder upper and lower side open-mouth all has sharp metal cutter.
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CN104515734A (en) * 2014-12-16 2015-04-15 广西科技大学 Visualization simulator and simulation method for tubular pile vertical static test
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