CN106978824B - A kind of soil body preparation device and preparation method thereof of simulated sea bottom complex slope - Google Patents

A kind of soil body preparation device and preparation method thereof of simulated sea bottom complex slope Download PDF

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Publication number
CN106978824B
CN106978824B CN201710135862.9A CN201710135862A CN106978824B CN 106978824 B CN106978824 B CN 106978824B CN 201710135862 A CN201710135862 A CN 201710135862A CN 106978824 B CN106978824 B CN 106978824B
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side slope
slope
model
soil body
model case
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CN106978824A (en
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赵维
宋晓龙
王忠涛
年廷凯
宋怀博
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Dalian University of Technology
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Dalian University of Technology
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines

Abstract

The present invention provides a kind of soil body preparation devices and preparation method thereof of simulated sea bottom complex slope, belong to construction project technical field.Soil body preparation device includes consolidation model case, experimental model case and model casing lifting apparatus.The present invention can be achieved preparation have layered structure, fault tectonic, meet it is true seabed side slope intensity gradient, the side slope that is formed by Landslide deposit body;Using PIV imaging observation, it can be achieved that real-time monitoring to experimentation;Using model casing lifting apparatus, it can be achieved that grade of side slope is arbitrarily adjusted in a certain range;The lower part soil body consolidates under the conditions of 1G, greatly reduces and accounts for the machine time, has saved cost.

Description

A kind of soil body preparation device and preparation method thereof of simulated sea bottom complex slope
Technical field
Side slope preparation facilities and method, especially a kind of soil body in centrifuge internal simulation sea bottom complex side slope prepare dress It sets and method.
Background technique
With China deep-sea sea area engineering development, seabed potential geological disaster especially seabed slope instability has become prestige An important factor for coercing deep-sea engineering structure.It is had been carried out largely for the domestic many scholars of submarine slope destabilization problems and mechanism Research.In the physical model experiment research for being related to seabed slope instability, common physical simulating method has 1G small than ruler mould The big proportional model test method of type test method, 1G, calibration cylinder test, 1G shaketalle test method, geomechanics test method, Centrifugal model test etc..Wherein centrifugal model test method can preferably reproduce soil body prototype stress field and character, all In physical model test method, centrifuge model test technique is most effective technological means.The preparation of seabed side slope is to true The indoor simulation of seabed side slope is the basis of such model investigation, has a great impact to the result of experiment.Currently, often The seabed side slope preparation method of rule is to cut slope method, both prepares a homogeneous soil by the way of self weight consolidation or load consolidation first Body, the side slope of the gradient needed for then being gone out using tools manual cuttings such as scraper plates.This method is primarily present following deficiency: 1, Homogeneous slope can only be prepared, without structural, also without layering and fault tectonic;2, slope surface intensity distribution is from top of the slope to slope foot It is sequentially increased, is not inconsistent that (slope surface intensity is consistent, is 0) with true seabed side slope intensity distribution;It 3, can not the true side of simulated sea bottom The intensity gradient on slope, the intensity gradient of the true soil body in seabed are 1.2-1.5, but are self-possessed to consolidate and load to consolidate and are extremely difficult to this Gradient.
Summary of the invention
It can be in the true sea bottom complex side slope of centrifuge internal simulation in view of the above-mentioned problems, the object of the present invention is to provide one kind Soil body preparation device and method, can be realized the seabed side slope prepared under Various Complex operating condition, comprising: have it is structural, point The side slope of layer construction, fault tectonic;The side slope formed by Landslide deposit body;Meet the side slope of true seabed side slope intensity distribution; Meet the side slope of true seabed side slope intensity gradient.Above-mentioned difference operating condition can be prepared respectively, can also be prepared simultaneously.
Technical solution of the present invention:
A kind of soil body preparation device of simulated sea bottom complex slope, including consolidation model case, experimental model case and model casing Lifting apparatus;
Consolidation model case is used for soil solidifying, the cube being spliced by consolidation bottom plate and three block baffles by bolt Hatch frame, there are sliding slot, T-type plate slides on the chute for the two sidewalls of cube hatch frame, cuts consolidated earth mass convenient for T-type plate It is segmented into native item;
Experimental model case is by two central angles for placing the side slope model being made of native item and installation observation device 61 °, arc length 750mm, with a thickness of 290mm, depth is that the circular die molding box of 250mm is spliced;The inside of circular die molding box Space is divide into upper part and lower part by PIV plate, wherein upper space is observed for camera shooting trough for installing with a thickness of 100mm Equipment, so as to the real-time monitoring to experimentation;Lower space with a thickness of 190mm, be model slot, for placing side slope model And provide the space that experiment occurs;
Model casing lifting apparatus adjusts the gradient of side slope model, by connecting plate and cushion block group for being lifted experimental model case At the height-adjustable of, cushion block, pass through the height for adjusting cushion block, realizes side slope model multi-angle regulation;Model casing lifting dress It sets and is connected by connecting plate with one end of experimental model case.
A method of sea bottom complex side slope being prepared in centrifuge using soil body preparation device, steps are as follows:
1) under the conditions of 1G, using load consolidation style, n soil sample is consolidated at various pressures respectively, formation meets true The soil body of real seabed side slope intensity gradient;
2) soil body is cut into native item with T-type plate, forms fixed boundary, prevents disturbance of the subsequent operation to the lower part soil body, Then the baffle of consolidation model case is removed;
3) native item is removed into consolidation model case with supporting plate, is successively placed in the mould of experimental model case from high in the end according to intensity In type groove, the underclad portion of side slope model is constituted;
4) under the conditions of nG, the top section of side slope model is prepared by the way of self weight consolidation: experimental model case is set Inside centrifuge, revolving speed is improved to nG, using drum centrifuge provisions for grouting by slurry prime to the model of experimental model case In slot, revolving speed is kept until mud intensity reaches requirement, the soil body at this time has point for meeting true submarine soil intensity gradient Layer structure;
5) stop centrifuge, the connecting plate of model casing lifting apparatus is fixed to experimental model case one end, raises experiment mould One end of molding box, the side slope of the gradient needed for being formed, and the thickness by changing cushion block adjust grade of side slope, and side slope at this time is referred to as Initial side slope;
6) start to prepare complex slope on the basis of initial side slope, including the side slope with fault tectonic and by landslide heap The side slope that product body is formed;For the side slope with fault tectonic, sheet plastic is inserted perpendicularly into side in initial side slope design position The slope soil body forms the side slope with fault tectonic after extraction;For the side slope formed by Landslide deposit body, first with tool The slope of a great slope is cut in initial side slope, then mentioning high G-value makes it come down under Gravitative Loads, after landslide Consolidation certain time forms the side slope formed by Landslide deposit body.
The invention has the advantages that: preparation, which can be achieved, to be had layered structure, fault tectonic, meets true seabed side slope Intensity gradient, the side slope formed by Landslide deposit body;Using PIV imaging observation, it can be achieved that real-time monitoring to experimentation;Benefit With model casing lifting apparatus, it can be achieved that grade of side slope is arbitrarily adjusted in a certain range;The lower part soil body consolidates under the conditions of 1G, greatly Reduce greatly and account for the machine time, has saved cost.
Detailed description of the invention
Fig. 1 (a) is the main view of consolidation model case.
Fig. 1 (b) is the sectional view of consolidation model case.
Fig. 2 (a) is the side view of experimental model case.
Fig. 2 (b) is the main view of experimental model case.
Fig. 3 (a) is the main view of model casing lifting apparatus.
Fig. 3 (b) is the right view of model casing lifting apparatus.
In figure: 1 consolidation model case;2 consolidation bottom seats;3 baffles;4 bolts;5 sliding slots;6T template;7 experimental model casees; 8PIV plate;9 camera shooting troughs;10 model slots;11 model casing lifting apparatus;12 connecting plates;13 cushion blocks.
Specific embodiment
A specific embodiment of the invention is described in detail below in conjunction with technical solution (and attached drawing).
The present invention provides a kind of preparation facilities of sea bottom complex side slope, comprising: consolidation model case 1, experimental model case 7, Model casing lifting apparatus 11;
The consolidation model case 1, the consolidation for the soil body.It is spliced by pedestal 2 and three section baffles 3 by bolt 4, side There are sliding slots 5 for wall, are convenient for 6 cutting soil of T-type plate.
The experimental model case 7, for providing the placement space of model and observation device.It is 61 ° by two central angles, arc A length of 750mm, with a thickness of 290mm, depth is that the circular die molding box of 250mm is spliced.It is upper that inner space is divided by PIV plate 8 Lower two parts, wherein upper space 100mm, to image trough 9, for placing observation device, so as to the real-time of experimentation Monitoring;Lower space 190mm is model slot 10, for placing the model of preparation and providing the space of experiment generation.
The model casing lifting apparatus 11 adjusts the gradient of preparation side slope for being lifted one end of experimental model case.By even Fishplate bar 12, cushion block 13 form, and model casing lifting apparatus 11 is connected by connecting plate 12 with one end of experimental model case 7.
A method of sea bottom complex side slope is prepared in centrifuge using above-mentioned apparatus, comprising the following steps:
1) under the conditions of 1G, by the way of load consolidation, n soil sample is consolidated at various pressures respectively, formation meets The soil body of true seabed side slope intensity gradient;
2) it is inserted into the soil body along model casing side wall sliding slot 5 with T-type plate 6, into strips by soil body cutting, forms fixed boundary, prevents Then only disturbance of the subsequent operation to the lower part soil body removes the baffle 3 of consolidation model case 1;
3) native item is removed into consolidation model case with supporting plate, is successively placed in the mould of experimental model case from high in the end according to intensity In type groove, the underclad portion of side slope model is constituted
4) under the conditions of nG, the top section of side slope model is prepared by the way of self weight consolidation;Experimental model case 7 is put Enter inside centrifuge, improve revolving speed to nG, using drum centrifuge provisions for grouting by slurry prime to the model of experimental model case 7 In slot 10, revolving speed is kept until mud intensity reaches requirement, and the soil body at this time, which has, meets true submarine soil intensity gradient Layered structure;
5) stop centrifuge, the connecting plate 12 of model casing lifting apparatus 11 is fixed to experimental model case one end, raises mould One end of molding box, the side slope of the gradient needed for being formed, and the thickness by changing cushion block adjust grade of side slope, and side slope at this time is referred to as Initial side slope;
6) start on the basis of initial side slope prepare complex slope: including with fault tectonic side slope, by landslide heap The side slope that product body is formed.For the side slope with fault tectonic, sheet plastic is inserted perpendicularly into side in initial side slope design position The slope soil body forms the side slope with fault tectonic after extraction;For the side slope formed by Landslide deposit body, first with tool The slope for cutting out a great slope is cut in initial side slope, then mentioning high G-value makes it come down under Gravitative Loads, after landslide Consolidation certain time forms the side slope formed by Landslide deposit body.

Claims (2)

1. a kind of soil body preparation device of simulated sea bottom complex slope, which is characterized in that the soil body preparation device includes consolidation mould Molding box, experimental model case and model casing lifting apparatus;
Consolidation model case is used for soil solidifying, is open by consolidation bottom plate and three block baffles by the cube that bolt is spliced Structure, there are sliding slot, T-type plate slides on the chute for the two sidewalls of cube hatch frame, is cut into consolidated earth mass convenient for T-type plate Native item;
Experimental model case is 61 ° by two central angles for placing the side slope model and installation observation device that are made of native item, Arc length is 750mm, and with a thickness of 290mm, depth is that the circular die molding box of 250mm is spliced;The inner space of circular die molding box Be divide into upper part and lower part by PIV plate, wherein upper space with a thickness of 100mm, to image trough, for installing observation device, So as to the real-time monitoring to experimentation;Lower space with a thickness of 190mm, be model slot, for place side slope model and The space that experiment occurs is provided;
Model casing lifting apparatus, for being lifted experimental model case, the gradient of adjusting side slope model is made of connecting plate and cushion block, Cushion block it is height-adjustable, pass through adjust cushion block height, realize side slope model multi-angle regulation;Model casing lifting apparatus is logical Connecting plate is crossed to be connected with one end of experimental model case.
2. a kind of method that the soil body preparation device using simulated sea bottom complex slope prepares sea bottom complex side slope in centrifuge, It is characterized in that, steps are as follows:
1) under the conditions of 1G, using load consolidation style, n soil sample is consolidated at various pressures respectively, formation meets true sea The soil body of bottom edge slope intensity gradient;
2) soil body is cut into native item with T-type plate, forms fixed boundary, prevents disturbance of the subsequent operation to the lower part soil body, then Remove the baffle of consolidation model case;
3) native item is removed into consolidation model case with supporting plate, is successively placed in the model slot of experimental model case from high in the end according to intensity It is interior, constitute the underclad portion of side slope model;
4) under the conditions of nG, prepare the top section of side slope model by the way of self weight consolidation: by experimental model case be placed in from Inside scheming, revolving speed is improved to nG, using drum centrifuge provisions for grouting by the model slot of slurry prime to experimental model case, Revolving speed is kept until mud intensity reaches requirement, the soil body at this time has the layering knot for meeting true submarine soil intensity gradient Structure;
5) stop centrifuge, the connecting plate of model casing lifting apparatus is fixed to experimental model case one end, raises experimental model case One end, formed needed for the gradient side slope, and by change cushion block thickness adjust grade of side slope, side slope at this time is referred to as initial Side slope;
6) start to prepare complex slope on the basis of initial side slope, including the side slope with fault tectonic and by Landslide deposit body The side slope of formation;For the side slope with fault tectonic, sheet plastic is inserted perpendicularly into side slope soil in initial side slope design position Body forms the side slope with fault tectonic after extraction;For the side slope formed by Landslide deposit body, first with tool first The slope slope that a great slope is cut on initial line slope, then mentioning high G-value makes it come down under Gravitative Loads, solid after landslide Knot certain time forms the side slope formed by Landslide deposit body.
CN201710135862.9A 2017-03-09 2017-03-09 A kind of soil body preparation device and preparation method thereof of simulated sea bottom complex slope Active CN106978824B (en)

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CN109668783A (en) * 2018-12-26 2019-04-23 长安大学 Unstability centrifugal model test test macro in Shield Tunneling face under the conditions of seepage flow
CN110296881B (en) * 2019-04-16 2022-07-12 上海大学 Soil body model test system and method suitable for rock-soil side slope and roadbed embankment

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Publication number Priority date Publication date Assignee Title
JP2010266347A (en) * 2009-05-15 2010-11-25 Japan Atomic Energy Agency Geological structure survey system and method therefor
CN104751725A (en) * 2015-04-21 2015-07-01 河海大学 Side slope landslide teaching demonstration device and experiment method
CN205426884U (en) * 2015-04-29 2016-08-03 长沙理工大学 Overburden slope stability test model of multi -angle basement rock can simulate

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JP2010266347A (en) * 2009-05-15 2010-11-25 Japan Atomic Energy Agency Geological structure survey system and method therefor
CN104751725A (en) * 2015-04-21 2015-07-01 河海大学 Side slope landslide teaching demonstration device and experiment method
CN205426884U (en) * 2015-04-29 2016-08-03 长沙理工大学 Overburden slope stability test model of multi -angle basement rock can simulate

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