CN103234724A - Shaping method for experimental grotto of earthquake simulated vibration platform model - Google Patents

Shaping method for experimental grotto of earthquake simulated vibration platform model Download PDF

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CN103234724A
CN103234724A CN2013101549083A CN201310154908A CN103234724A CN 103234724 A CN103234724 A CN 103234724A CN 2013101549083 A CN2013101549083 A CN 2013101549083A CN 201310154908 A CN201310154908 A CN 201310154908A CN 103234724 A CN103234724 A CN 103234724A
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China
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cavern
grotto
test
solid
forming
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CN2013101549083A
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CN103234724B (en
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盛谦
陈健
刘晓敏
冷先伦
朱泽奇
张勇慧
陈国良
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中国科学院武汉岩土力学研究所
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Abstract

The invention relates to a shaping method for an experimental grotto of an earthquake simulated vibration platform model. The method comprises the following steps of 1), manufacturing a wood mould with a grotto size consistent to an experimental request of a model, molding, additionally hardening and weighing a polystyrene foaming grotto model according to a model size, and wrapping a layer of polyvinyl chloride plastics on the surface of the grotto model; 2), drawing a grotto profile on a side wall in a model box according to a designed position for positioning, and fixing the borders of the grotto and the model box by the adoption of square wooden strips; 3), stuffing and symmetrically ramming around the grotto, and enabling the grotto model not to generate deviation; and 4), firstly digging the middle part of a grotto cross section, and then digging the edge and corner parts by utilizing the protection of plastic cloth on the outer layer of the model. By the adoption of the method, grottos with different shapes and sizes can be high-efficiently, simply and conveniently manufactured in model experiments, the accurate positioning of a grotto space is realized, the digging method is simple and convenient, and interference with model materials surrounding the grotto during the digging process is effectively reduced.

Description

A kind of earthquake simulation shaking table model test cavern forming method
Technical field
The present invention relates to a kind of earthquake simulation shaking table model test cavern forming method, relate generally to a kind of cavern's forming method of the earthquake simulation shaking table model test for engineering fields such as water power, traffic and the energy.
Background technology
Along with the fast development of water power, traffic and subterranean resource project construction, the underground chamber structure is used widely in these fields.Simultaneously, the stability of underground chamber structure under geological process also receives increasing the concern and attention.Because underground works has characteristics such as the big and geologic condition complexity of project scale more, and underground cavern structure is carried out stability analysis and estimated except using theoretical research and numerical computation method, also needs how to rely on model experiment.Model test be a kind of development early, be widely used, visual in image rock mass medium physics Research on Mechanical Properties method, be the important means that solves the complex engineering problem.In these large underground hole structural model tests, the moulding that successfully realizes the cavern is the key factor that model test can be carried out smoothly.
New through looking into, both at home and abroad not about the document record of shaking table model cavern forming method, the document of limited cavern's forming method all is to be applied in the static(al) model test at present, and the document situation is as follows:
1. Chinese patent publication number CN102691511A, open day 2012.9.26, denomination of invention is " burying the cavitation device of cavern in the underground works test model ", this application case has been introduced the cavitation device that buries the cavern in a kind of underground works test model, this device is mainly used in the moulding of spheroid cavity structure, can't be used for the cavern's model formings of growing up such as underground workshop, traffic tunnel.
2. Chinese patent publication number CN102444410A, open day 2012.5.9, denomination of invention is " location of the buried cavern of geomechanical model test and forming method ", this application case has been introduced location and the forming method of the buried cavern of a kind of geomechanical model test, this method is mainly used in location and the moulding of spheroid cavity structure, can't be used for the cavern's model formings of growing up such as underground workshop, traffic tunnel equally.
3. Chinese patent publication number CN1401861A, open day 2003.3.12, denomination of invention is " method and the specialized equipment of hidden cavern excavation in a kind of solid model test ", and this application case has been introduced method and the specialized equipment of hidden cavern excavation in a kind of solid model test.This method needs special complicated testing equipment, also needs pre-buried rope rope location, is used in the homogeneity model by the given step excavation.And in shaking table model, mainly study the response of cavern's model under earthquake load after cavern's moulding, the detailed process that does not need analogy model progressively to excavate.
Summary of the invention
At above-mentioned existing problems, the objective of the invention is for a kind of forming method that is applicable to earthquake simulation shaking table model test cavern is provided.
For achieving the above object, technical solution of the present invention is:
A kind of earthquake simulation shaking table model test cavern forming method may further comprise the steps:
1 makes cavern's solid model: the size by cavern's model in the model test is made the wood mold coupled of shape unanimity, increase the weight of polystyrene foam cavern solid model by the molded stiffened of wood mold coupled size, and at cavern's solid model surface parcel one deck igelite;
Cavern, 2 location solid model: according to model residing position in cavern's in the test design scheme, madial wall preposition at model casing draws cavern's profile for the location, lumps of wood bar by the distance making predetermined length between cavern and the model casing inwall adopts lumps of wood bar to fix between cavern and the model casing border;
3 tamping in layers: the country rock analog material that stirs is carried out tamping in layers, when arriving bottom, cavern absolute altitude Deng compacting, put into cavern's solid model of making, continuation is dosed the country rock analog material around cavern's solid model and is tamped, and ends when exceeding the top, cavern and reach the testing requirements absolute altitude;
4 excavation caverns: behind model compacting moulding and the bone dry, carry out cavern excavation, excavate middle part, transversal section, cavern earlier, the protective effect excavation position, corner of the outer field igelite cloth of recycling model.
To increase the weight of the density of polystyrene foam be 22Kg/m to stiffened in the described step 1 3, and general cystosepiment density is less than 15Kg/m 3So the polystyrene foam among the present invention has the high density feature.
Model surface parcel one deck igelite in the described step 1, its thickness is 1mm.The igelite that 1mm is thick has enough thickness to protect can not be corrupted to country rock around the cavern when excavation, guarantee that the hole wall behind the cavern excavation is smooth; Simultaneously, use too thick igelite can make the position, corner of cavern, parcel back model be difficult to keep original shape, thereby influence the shape after cavern's moulding.
In the described step 2 cavern location with fixedly comprise two concrete measures, at first at the preposition of the sidewall cavern's profile that draws, whether the position, cavern is offset when judging cavern's moulding; Another measure is the lumps of wood bar of making predetermined length by the distance of cavern and model casing, and the supporting role of usefulness lumps of wood bar is cavern's model fixedly.
Tamping in layers in the described step 3, in cavern's absolute altitude scope during compacting country rock analog material, should be in the cavern around the symmetry compacting, be not offset to guarantee cavern's model.
Owing to adopted above technical scheme, the present invention has following technical advantage:
1 adopts stiffened to increase the weight of polystyrene foam makes cavern's solid model, in model compacting manufacturing process cavern's solid model distortion very little, satisfy cavern's compact dimensions accuracy requirement.
2 wood mold coupled manufacture crafts are simple, and cavern's shape and size can require to adjust fully according to reality.
3 take full advantage of the characteristics that polystyrene foamed material is granule mold moulding, do not need specially to make underground boring tool, can excavate with general scoop.
During 4 excavation middle parts, transversal section, cavern, position, corner, transversal section, cavern plays a very good protection; When the excavation limit
During the angular position, because the protective effect that the igelite of model surface parcel plays can avoid excavating the destruction to surrounding rock of chamber fully, it is evenly closely knit to guarantee to excavate cavern's inner wall smooth, the hole week material finished.
Description of drawings
Fig. 1 is underground chamber model horizontal section synoptic diagram;
Fig. 2 is underground chamber model vertical profile synoptic diagram;
Fig. 3 is the wood mold coupled synoptic diagram of cavern's model;
Fig. 4 is cavern's model excavation subregion synoptic diagram.
In the accompanying drawing: 1-model casing and border; 2-country rock analog material; 3-polystyrene foam cavern model; Middle part, transversal section, 4-cavern; Position, corner, transversal section, 5-cavern.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
A kind of earthquake simulation shaking table model test cavern forming method may further comprise the steps:
1 makes cavern's solid model: according to the size of true cavern and the size that the geometric similarity guide calculates cavern's model in the model test in the actual engineering, size by the cavern's model that calculates is made the wood mold coupled of shape unanimity, as shown in Figure 3, be 22Kg/m by the molded density of die size 3Stiffened increase the weight of polystyrene foam cavern model, remove wood mold coupledly after the moulding, and to wrap up a layer thickness at model surface be the 1mm igelite;
Cavern, 2 location solid model: according to model residing position in cavern's in the test design scheme, determine the reserved location of cavern with ruler at model casing 1 madial wall, retouch out cavern's profile with red oiliness signature pen, whether the position, cavern is offset when being used for judging cavern's moulding, adopts lumps of wood bar to fix between cavern and the model casing border;
3 tamping in layers: the country rock analog material 2 that stirs is carried out tamping in layers, put into cavern's solid model 3 of making bottom the cavern during absolute altitude Deng compacting, country rock analog material 2 is filled out in continuation around cavern's solid model 3, during compacting, want the symmetry compacting, guaranteeing that cavern's model 3 is not offset, end when exceeding the top, cavern and reach the testing requirements absolute altitude;
4 excavation caverns: behind model compacting moulding and the bone dry; carry out cavern excavation; excavate the middle part, transversal section 4 of cavern 3 earlier; position, corner, transversal section 5 can play a protective role; after middle part 4 excavation finishes; position, corner 5 just can simple division, be easy to take out, and the outer field igelite of model also plays a protective role simultaneously.

Claims (3)

1. earthquake simulation shaking table model test cavern forming method, it is characterized in that: described model test cavern forming method carries out according to the following steps:
A makes cavern's solid model: the size by cavern's model in the model test is made the wood mold coupled of shape unanimity, increase the weight of polystyrene foam cavern solid model by the molded stiffened of wood mold coupled size, and at cavern's solid model surface parcel one deck igelite;
Cavern, b location solid model: according to model residing position in cavern's in the test design scheme, madial wall preposition at model casing draws cavern's profile for the location, lumps of wood bar by the distance making predetermined length between cavern and the model casing inwall adopts lumps of wood bar to fix between cavern and the model casing border;
C tamping in layers: the country rock analog material that stirs is carried out tamping in layers, when arriving bottom, cavern absolute altitude Deng compacting, put into cavern's solid model of making, continuation is dosed the country rock analog material around cavern's solid model and is tamped, and ends when exceeding the top, cavern and reach the testing requirements absolute altitude;
D excavates the cavern: behind model compacting moulding and the bone dry, carry out cavern excavation, excavate middle part, transversal section, cavern earlier, the protective effect excavation position, corner of the outer field igelite cloth of recycling model.
2. earthquake simulation shaking table model test as claimed in claim 1 cavern forming method is characterized in that: to increase the weight of the density of polystyrene foam be 22Kg/m to stiffened among the described step a 3
3. earthquake simulation shaking table model test as claimed in claim 1 cavern forming method, it is characterized in that: model surface parcel one deck igelite among the described step a, its thickness is 1mm.
CN201310154908.3A 2013-04-28 2013-04-28 Shaping method for experimental grotto of earthquake simulated vibration platform model Active CN103234724B (en)

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CN103854545A (en) * 2014-02-20 2014-06-11 中国人民解放军总参谋部工程兵科研三所 Method for protecting geological mechanical model hole fracture morphology preservation block
CN104297011A (en) * 2014-11-06 2015-01-21 山东大学 Forming and spatial positioning method for caverns in high-brittleness transparent rock-like material test piece

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CN103854545A (en) * 2014-02-20 2014-06-11 中国人民解放军总参谋部工程兵科研三所 Method for protecting geological mechanical model hole fracture morphology preservation block
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CN104297011B (en) * 2014-11-06 2016-08-24 山东大学 The shaping of cavern and space-location method in high brittle transparent rock-like materials test specimen

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