CN109655601A - Model test foundation pit enclosure structure deeply mixing cement-soil pile test device and test method - Google Patents
Model test foundation pit enclosure structure deeply mixing cement-soil pile test device and test method Download PDFInfo
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- CN109655601A CN109655601A CN201910034083.9A CN201910034083A CN109655601A CN 109655601 A CN109655601 A CN 109655601A CN 201910034083 A CN201910034083 A CN 201910034083A CN 109655601 A CN109655601 A CN 109655601A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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Abstract
本发明公开了一种模型试验基坑围护结构深层水平位移测试装置，包括顶部敞口的模型箱，模型箱内填入有砂土，砂土内固定有一圈模型桩，模型桩的两相对侧外分别固定连接有沿着深度方向等间隔分布的横向布置的钢棒，各钢棒的外围活动套装有空心玻璃管，空心玻璃管的内端自由置于模型桩附近，空心玻璃管的外端贯穿并伸出模型箱外并且空心玻璃管固定在模型箱的被贯穿位置处，各钢棒的外端沿着空心玻璃管内自由伸出模型箱外并连接至一位移测量装置。本发明公开了一种模型试验基坑围护结构深层水平位移测试装置的测试方法。本发明能够合理、精确地测出维护结构的深层水平位移。
The invention discloses a deep horizontal displacement testing device of a foundation pit enclosure structure for a model test, comprising a model box with an open top, the model box is filled with sand, a circle of model piles is fixed in the sand, and two opposite sides of the model pile are The laterally arranged steel rods distributed at equal intervals along the depth direction are fixedly connected to the sides and the outer sides respectively. The periphery of each steel rod is movably sheathed with a hollow glass tube. The inner end of the hollow glass tube is freely placed near the model pile, and the outer The end penetrates and protrudes out of the model box and the hollow glass tube is fixed at the penetrated position of the model box. The outer end of each steel rod freely extends out of the model box along the hollow glass tube and is connected to a displacement measuring device. The invention discloses a testing method of a deep horizontal displacement testing device for a model test foundation pit envelope structure. The invention can reasonably and accurately measure the deep horizontal displacement of the maintenance structure.
Description
Technical field
The present invention relates to foundation pit enclosure technical field of construction more particularly to a kind of model test foundation pit enclosure structure deep waters
Flat displacement tester and test method.
Background technique
In recent years with the fast development of the infrastructure constructions such as domestic subway, important shape of the campshed as foundation pit enclosure structure
One of formula, carries it and the research of deformation characteristic is always the heat subject in geotechnical engineering field.Due to field test
Less economical, test result nonrepeatability, most scholar is carried out by the methods of theory analysis, model experiment and numerical analysis
Correlative study.But Most scholars during carrying out model test often it is worried in be difficult to it is reasonable, accurately measure building enclosure
Deeply mixing cement-soil pile.Horizontal displacement is to analyze the basic data of building enclosure deformation characteristic, and the accurate related data that obtains is pair
The basis of the deformation characteristic of reasonable analysis building enclosure, and the rationally premise of understanding and design building enclosure.So taking assorted
Measure, rationally measuring building enclosure deeply mixing cement-soil pile is particularly significant and has very important significance.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of model test base
Pit enclosure structure deeply mixing cement-soil pile test device, can rationally, accurately measure the deeply mixing cement-soil pile of enclosed structure.
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, a kind of model test is also provided
The test method of foundation pit enclosure structure deeply mixing cement-soil pile test device can rationally, accurately measure the deep layer of enclosed structure
Horizontal displacement.
In order to solve the above technical problems, the technical solution adopted by the present invention is that, a kind of model test foundation pit enclosure structure is deep
Layer horizontal displacement test device, the model casing including open top are filled with sand in model casing, two rows of phases are fixed in sand
Pair Model Pile, the steel for the lateral arrangement being spacedly distributed along depth direction is respectively fixedly connected on the outside of two rows of Model Piles
Stick, the periphery of each rod iron are movably installed with hollow glass tube, and the inner end of hollow glass tube is freely placed near Model Pile, hollow glass
The outer end of glass pipe run through and stretch out that model casing is outer and hollow glass tube be fixed on model casing by position, each rod iron
Outer end in hollow glass tube along freely stretching out outside model casing and be connected to a displacement measuring device.
As a further improvement of the present invention, at the model casing open top at the sand on the outside of two rows of Model Piles
Equipped with the displacement measuring device protruded into sand.
As a further improvement of the present invention, institute's displacement measurement device is dial gauge, and each dial gauge is commonly connected to
One data acquisition equipment.
As a further improvement of the present invention, rod iron, hollow glass tube and the percentage on the outside of two rows of Model Piles
Table has seven respectively.
As a further improvement of the present invention, the two opposite sides of the model casing are provided with seven round holes, each hollow
The outer end proximal end of glass tube is fixed at respective circular hole.
As a further improvement of the present invention, the inner end of the rod iron is fixed in Model Pile by hot melt adhesive, hollow
The outer end of glass tube is fixed at the round hole of model casing proximally by hot melt adhesive.
As a further improvement of the present invention, the hollow glass tube uses lucite tube.
As a further improvement of the present invention, the data acquisition equipment is deformeter.
In order to solve the above technical problems, the present invention also the technical solution adopted is that, a kind of model test foundation pit enclosure structure
The test method of deeply mixing cement-soil pile test device, this method are by excavating the sand in Model Pile along depth direction point multilayer
Soil, using model casing outside displacement measuring device measure the horizontal displacement of each rod iron, to obtain the deeply mixing cement-soil pile of Model Pile.
As a further improvement of the present invention, this method is fixed on the inside of two rows of Model Piles also after one layer of sand of every excavation
Opposite purlin, and set up the purlin of support system support phase pair.
Compared with prior art, model test foundation pit enclosure structure deeply mixing cement-soil pile test device and test of the invention
Method has the beneficial effect that:
(1) by arranged on Model Pile depth direction can in hollow glass tube free-moving rod iron, and rod iron
One end link model stake, the other end connect displacement measuring device, and Model Pile can occur together with rod iron, so as to reasonable, smart
Really measure the deeply mixing cement-soil pile of Model Pile.
Through the following description and in conjunction with the attached drawings, the present invention will become more fully apparent, these attached drawings are used to explain the present invention
Embodiment.
Detailed description of the invention
Fig. 1 is excavation of foundation pit model test apparatus schematic diagram.
Fig. 2 is excavation of foundation pit model test apparatus connection schematic diagram.
Fig. 3 is that pile lateral displacement arranges front schematic view.
Fig. 4 is pile lateral displacement schematic diagram, and displacement is positive and indicates that stake top is moved into Foundation Pit, and displacement is negative and indicates stake
It pushes up and is moved outside Foundation Pit.
Specific embodiment
The embodiment of the present invention described referring now to the drawings, similar element numbers represent similar element in attached drawing.
Fig. 1-4 is please referred to, the model test foundation pit enclosure structure deeply mixing cement-soil pile test device includes model casing
1, model casing is having a size of 2200mm*1000mm*1500mm body structure, and box frame uses square steel, and top of the box is open, preceding
Two sides are equipped with transparent plastic sheet afterwards, and the left and right sides is equipped with steel plate.Sand 2 is filled in model casing 1.Left and right is fixed in sand 2
Two rows of Model Piles 3, top and the sand 2 of Model Pile 3 are substantially flush, the bottom 200mm of the distance from bottom model casing 1 of Model Pile 3,
The distance between two rows of Model Piles 3 are 530mm, and the distance between the Model Pile 3 in left side and model casing 1 are 1050mm, right side
The distance between Model Pile 3 and model casing 1 are 330mm.Model Pile 3, which is first put into model casing 1, is further filled with sand 2.Two rows of models
The outside of stake 3 is respectively fixedly connected with the rod iron 4 for the lateral arrangement (i.e. left and right directions) being spacedly distributed along depth direction, left
The length for the rod iron 4 being fixedly connected on the outside of the Model Pile 3 of side is longer than the length for the rod iron 4 being fixedly connected on the outside of the Model Pile 3 on right side
Degree, the diameter of rod iron 4 are 3-6mm, preferably 5mm.The periphery of each rod iron 4 is movably installed with hollow glass tube 5, hollow glass tube
5 diameter is 10mm.The inner end of each hollow glass tube 5 is freely placed near Model Pile 3, and the outer end of each hollow glass tube 5 is run through
And stretch out outside 1 corresponding side of model casing, to facilitate experiment to test, and hollow glass tube 5 be fixed on model casing 1 by through position
Place.The outer end of each rod iron 4 is outer and be connected to a displacement along model casing 1 and hollow glass tube 5 is freely stretched out in hollow glass tube 5
Measuring device 6, stretch out hollow glass tube 5 outside be for convenience with 6 connecting test of displacement measuring device, with displacement measuring device 6
Measure 4 free end travel of rod iron.Rod iron 4 can the free movement in hollow glass tube 5, do not influenced by sand body around, and
Model Pile 3 with rod iron 4 again because being fixedly connected, therefore the displacement of Model Pile 3 passes to rod iron 4, by the displacement for measuring rod iron 4
It can be obtained the displacement of Model Pile 3, therefore the horizontal displacement of each point can pass through mould on the outside of 3 depth direction of two rows of Model Piles
The measurement of measuring system 6 of 1 left and right sides depth direction of molding box arrangement obtains.
It is also equipped on the sand 2 of the open top position of the model casing 1 in the outside of two rows of Model Piles 3 and protrudes into sand 2
Interior displacement measuring device 6, there are five the displacement measuring devices 6 in 3 outside sand 2 of left side Model Pile, and five displacements are surveyed
It measures in device 6 by close to Model Pile 3 to the interval the every two adjacent displacement measuring devices 6 in the direction far from Model Pile 3
Distance is successively 100mm, 100mm, 150mm, 150mm.The displacement measuring device 6 being packed into the 3 outside sand 2 of Model Pile of right side has
Three, often the spacing distance between two adjacent displacement measuring devices 6 is 100mm.Institute's displacement measurement device 6 is percentage
Table, each dial gauge are commonly connected to a data acquisition equipment, and the data acquisition equipment is deformeter.The two rows Model Pile 3
Rod iron 4, hollow glass tube 5 and the dial gauge in outside have seven respectively, seven rod irons 4 in 3 outside of left side Model Pile and the right side
Seven rod irons 4 in 3 outside of side Model Pile are spacedly distributed along depth direction, spacing distance 150mm, the rod iron 4 of the top
Apart from 2 top surface 150mm of sand.The periphery of each rod iron 4 is cased with a hollow glass tube 5, therefore per two adjacent hollow glass
Spacing distance between glass pipe 5 is also 150mm, positioned at the 2 top surface 150mm of centre distance sand of the hollow glass tube 5 of the top,
Each hollow glass tube 5 plays the role of isolation and protection to the displacement of corresponding rod iron 4.The left and right two-phase of the model casing 1
Seven round hole 1a, the spacing distance 150mm being spacedly distributed along depth direction are provided on the steel plate of opposite side, with Model Pile
The hollow glass tube 5 of 3 left and right sides corresponds, and the outer end proximal end of each hollow glass tube 5 is fixed at the 1a of respective circular hole.It is described
The inner end of rod iron 4 is fixed in Model Pile 3 by hot melt adhesive, and the outer end of hollow glass tube 5 is fixed on mould proximally by hot melt adhesive
At the round hole 1a of molding box 1.The hollow glass tube 5 uses lucite tube.
The test method of the model test foundation pit enclosure structure deeply mixing cement-soil pile test device, this method is to pass through
Divide multilayer to excavate the sand 2 in Model Pile 3 along depth direction, measures each rod iron using the displacement measuring device 6 outside model casing 1
4 horizontal displacement, to obtain the deeply mixing cement-soil pile of Model Pile 3.Excavating sand 2 to divide is five layers, and first layer cutting depth is
100mm, second layer cutting depth are 200mm, and third layer cutting depth is 200mm, and the 4th layer of cutting depth is 200mm, the 5th
Layer cutting depth is 400mm.This method also it is every excavation one layer of sand after two rows of 3 inside stationary phases pair of Model Pile purlin 7,
And set up the purlin 7 that support system 8 supports left and right opposite.After excavating first layer, first of support system 8 is erected at left and right
Between the top of the Model Pile 3 on both sides, be specifically erected at the Model Pile 3 of the right and left the top connection crown beam 9 it
Between, the spacing between second support system 8 in first of support system 8 and the second layer is 250mm, the third in third layer
The 4th support system 8 and third layer between second support system 8 in road support system 8 and the second layer, in the 4th layer
The 4th support system 8 between interior third road support system 8, in the 5th support system 8 and the 4th layer in layer 5
Between spacing be 250mm.During the experiment, measurement is ideal, is applicable in reliable model by simple economy
Experimental method obtains the deeply mixing cement-soil pile of building enclosure.
Displacement measuring device 6, the hat in left side are also equipped at the top of the crown beam 9 of the top connection of the Model Pile 3 of the right and left
The distance between immediate displacement measuring device 6 in the displacement measuring device 6 and 3 outside sand 2 of left side Model Pile at 9 top of beam
It is 100mm.Immediate displacement measurement in the displacement measuring device 6 and 3 outside sand 2 of right side Model Pile at 9 top of right side crown beam
The distance between device 6 is 100mm.
Combining most preferred embodiment above, invention has been described, but the invention is not limited to implementations disclosed above
Example, and various modifications, equivalent combinations according to the essence of the present invention should be covered.
Claims (10)
1. a kind of model test foundation pit enclosure structure deeply mixing cement-soil pile test device characterized by comprising open top
Model casing is filled with sand in model casing, and two rows of opposite Model Piles are fixed in sand, and the outside of two rows of Model Piles is solid respectively
Surely it is connected with the rod iron for the lateral arrangement being spacedly distributed along depth direction, the periphery of each rod iron is movably installed with hollow glass
Pipe, the inner end of hollow glass tube is freely placed near Model Pile, the outer end of hollow glass tube run through and stretch out model casing it is outer and
Hollow glass tube be fixed on model casing by the position, the outer end of each rod iron is along freely stretching out model in hollow glass tube
Case is outer and is connected to a displacement measuring device.
2. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as described in claim 1, it is characterised in that: institute
It states and is also equipped with the displacement measuring device protruded into sand at the sand on the outside of two rows of Model Piles at model casing open top.
3. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 2, it is characterised in that: institute
Displacement measurement device is dial gauge, and each dial gauge is commonly connected to a data acquisition equipment.
4. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 3, it is characterised in that: institute
Rod iron, hollow glass tube and the dial gauge on the outside of two rows of Model Piles stated have seven respectively.
5. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 4, it is characterised in that: institute
The two opposite sides for stating model casing are provided with seven round holes, and the outer end proximal end of each hollow glass tube is fixed at respective circular hole.
6. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 5, it is characterised in that: institute
The inner end for stating rod iron is fixed in Model Pile by hot melt adhesive, and the outer end of hollow glass tube is fixed on model proximally by hot melt adhesive
At the round hole of case.
7. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 6, it is characterised in that: institute
Hollow glass tube is stated using lucite tube.
8. model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 3, it is characterised in that: institute
Stating data acquisition equipment is deformeter.
9. a kind of test side of model test foundation pit enclosure structure deeply mixing cement-soil pile test device according to claim 1
Method, it is characterised in that: this method be by along depth direction point multilayer excavate Model Pile in sand, using model casing outside
Displacement measuring device measures the horizontal displacement of each rod iron, to obtain the deeply mixing cement-soil pile of Model Pile.
10. the test method of model test foundation pit enclosure structure deeply mixing cement-soil pile test device as claimed in claim 8,
It is characterized in that: the purlin of this method stationary phase pair on the inside of two rows of Model Piles also after one layer of sand of every excavation, and set up branch
The purlin of support body system support phase pair.
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| CN201910034083.9A CN109655601A (en) | 2019-01-15 | 2019-01-15 | Model test foundation pit enclosure structure deeply mixing cement-soil pile test device and test method |
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| CN201910034083.9A CN109655601A (en) | 2019-01-15 | 2019-01-15 | Model test foundation pit enclosure structure deeply mixing cement-soil pile test device and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113668619A (en) * | 2021-07-02 | 2021-11-19 | 浙江工业大学 | A vertical envelope horizontal displacement monitoring devices for foundation ditch model test |
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| CN113668619A (en) * | 2021-07-02 | 2021-11-19 | 浙江工业大学 | A vertical envelope horizontal displacement monitoring devices for foundation ditch model test |
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Application publication date: 20190419 |