CN103234724B - 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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Publication number
CN103234724B
CN103234724B CN201310154908.3A CN201310154908A CN103234724B CN 103234724 B CN103234724 B CN 103234724B CN 201310154908 A CN201310154908 A CN 201310154908A CN 103234724 B CN103234724 B CN 103234724B
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cavern
grotto
test
solid
forming
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CN103234724A (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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Wuhan Institute of Rock and Soil Mechanics of CAS
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Wuhan Institute of Rock and Soil Mechanics of CAS
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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, underground chamber structure is used widely in these fields.Meanwhile, the stability of underground chamber structure under geological process also receives increasing concern and attention.Have the features such as the large and complex geologic conditions of project scale more due to underground works, stability analysis and evaluation is carried out except with except theoretical research and numerical computation method to underground chamber structure, also needs how to rely on model experiment.Model test be a kind of development comparatively early, be widely used, visual in image rock mass physico mechanical characteristic research method, be the important means solving complex engineering problem.In these large underground hole structural model tests, successfully realize the shaping key factor being model test and can carrying out smoothly of cavern.
New through looking into, do not record about the document of shaking table model cavern forming method both at home and abroad at present, the document of limited cavern's forming method is all be applied in Static Model test, and document situation is as follows:
1. China Patent Publication No. CN102691511A, publication date 2012.9.26, denomination of invention is " cavitation device of underground works test model Nei Mai cavern ", this application case describes a kind of cavitation device of underground works test model Nei Mai cavern, it is shaping that this device is mainly used in spheroid cavity structure, cannot be used for underground workshop, traffic tunnel etc. and to grow up cavern's model forming.
2. China Patent Publication No. CN102444410A, publication date 2012.5.9, denomination of invention is " location of the buried cavern of geomechanical model test and forming method ", this application case describes location and the forming method of the buried cavern of a kind of geomechanical model test, the method is mainly used in the location of spheroid cavity structure and shaping, cannot be used for underground workshop, traffic tunnel etc. equally and to grow up cavern's model forming.
3. China Patent Publication No. CN1401861A, publication date 2003.3.12, denomination of invention is " in the test of a kind of solid model the method for hidden cavern excavation and specialized equipment ", and this application case describes method and the specialized equipment of hidden cavern excavation in the test of a kind of solid model.The method needs special complicated testing equipment, also needs pre-buried rope rope to locate, for excavating by given step in homogeneous model.And in shaking table model, the response of main research shaping rear cavern of cavern model under earthquake load, does not need the detailed process that analogy model progressively excavates.
Summary of the invention
For above-mentioned existing problems, the object of the invention is to provide a kind of forming method being applicable to earthquake simulation shaking table model test cavern.
For achieving the above object, technical solution of the present invention is:
A kind of earthquake simulation shaking table model test cavern forming method, comprises the following steps:
1 makes cavern solid model: make consistent wood mold coupled of shape by the size of cavern's model in model test, polystyrene foam cavern solid model is increased the weight of by the molded stiffened of wood mold coupled size, and at cavern's solid model surface parcel one deck igelite;
2 location cavern solid models: according to the position in test design scheme residing for cavern's model, the madial wall preposition of model casing draws cavern's profile for location, make the square wood strip of predetermined length by the distance between cavern and model casing inwall, between cavern and model casing border, adopt square wood strip to fix;
3 tamping in layers: the country rock analog material be stirred is carried out tamping in layers, during Deng compacting to cavern's elevation of bottom, put into the cavern's solid model made, continue around cavern's solid model, dose country rock analog material and tamp, stop to when exceeding Mass Near The Top of Underground Cavity and reach testing requirements absolute altitude;
4 excavation caverns: model is tamped shaping and after bone dry, carried out cavern excavation, first excavates middle part, transversal section, cavern, the protective effect excavation position, corner of the outer field igelite of recycling model.
In described step 1, stiffened increases the weight of the density of polystyrene foam is 22Kg/m 3, and general cystosepiment density is less than 15Kg/m 3, therefore the polystyrene foam in the present invention has high density feature.
In described step 1, model surface wraps up one deck igelite, and its thickness is 1mm.The igelite that 1mm is thick has enough thickness to protect can not be corrupted to country rock around cavern when excavating, and ensures that the hole wall after cavern excavation is smooth; Meanwhile, use too thick igelite that the position, corner of cavern's model after parcel can be made to be difficult to keep original shape, thus affect cavern shaping after shape.
In described step 2, cavern locates and fixedly comprises two concrete measures, and first on the preposition of sidewall, draw cavern's profile, during for judging that cavern is shaping, whether position, cavern offsets; Another measure is the square wood strip making predetermined length by the distance of cavern and model casing, fixes cavern's model with the supporting role of square wood strip.
Tamping in layers in described step 3, when tamping country rock analog material in cavern's elevation range, should symmetrically around cavern tamp, to guarantee that cavern's model does not offset.
Owing to have employed 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, and in model compacting manufacturing process, cavern's solid model distortion is very little, meets cavern's compact dimensions accuracy requirement.
2 wood mold coupled manufacture crafts are simple, and tunnel shape and size can adjust according to actual requirement completely.
3 to make full use of polystyrene foamed material be the shaping feature of granule mold, do not need specially to make underground boring tool, can excavate with general scoop.
During 4 excavation middle part, transversal section, cavern, position, corner, transversal section, cavern plays a very good protection; When excavation limit
During angular position, due to the protective effect played of igelite of model surface parcel, can avoid completely excavating the destruction to surrounding rock of chamber, the cavern's inner wall smooth ensureing excavate, all homogenize material in hole are closely knit.
Accompanying drawing explanation
Fig. 1 is underground chamber model horizontal section schematic diagram;
Fig. 2 is underground chamber model vertical profile schematic diagram;
Fig. 3 is the wood mold coupled schematic diagram of cavern's model;
Fig. 4 is cavern's model excavation in zones schematic diagram.
In 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, comprises the following steps:
1 makes cavern solid model: the size calculating cavern's model in model test according to the size of cavern true in Practical Project and geometric similarity guide, consistent wood mold coupled of shape is made by the size of the cavern's model calculated, as shown in Figure 3, be 22Kg/m by the molded density of die size 3stiffened increase the weight of polystyrene foam cavern model, shaping rear removal is wood mold coupled, and to wrap up a layer thickness at model surface be 1mm igelite;
2 location cavern solid models: according to the position in test design scheme residing for cavern's model, the reserved location of cavern is determined at model casing 1 madial wall ruler, cavern's profile is described with red oiliness signature pen, during for judging that cavern is shaping, whether position, cavern offsets, and adopts square wood strip to fix between cavern and model casing border;
3 tamping in layers: the country rock analog material 2 be stirred is carried out tamping in layers, Deng compacting to putting into the cavern's solid model 3 made during cavern's elevation of bottom, continue to fill out country rock analog material 2 around cavern's solid model 3, during compacting, want symmetrical compacting, to guarantee that cavern's model 3 does not offset, stop to when exceeding Mass Near The Top of Underground Cavity and reach testing requirements absolute altitude;
4 excavation caverns: model compacting is shaping and after bone dry; carry out cavern excavation; first excavate the middle part, transversal section 4 of cavern 3; position, corner, transversal section 5 can play a protective role; after having excavated Deng middle part 4; position, corner 5 just can simple division, be easy to take out, simultaneously the outer field igelite of model also plays a protective role.

Claims (3)

1. an earthquake simulation shaking table model test cavern forming method, is characterized in that: described model test cavern forming method carries out according to the following steps:
A makes cavern solid model: make consistent wood mold coupled of shape by the size of cavern's model in model test, polystyrene foam cavern solid model is increased the weight of by the molded stiffened of wood mold coupled size, and at cavern's solid model surface parcel one deck igelite;
B locates cavern's solid model: according to the position in test design scheme residing for cavern's model, the madial wall preposition of model casing draws cavern's profile for location, make the square wood strip of predetermined length by the distance between cavern and model casing inwall, between cavern and model casing border, adopt square wood strip to fix;
C tamping in layers: the country rock analog material be stirred is carried out tamping in layers, during Deng compacting to cavern's elevation of bottom, put into the cavern's solid model made, continue around cavern's solid model, dose country rock analog material and tamp, stop to when exceeding Mass Near The Top of Underground Cavity and reach testing requirements absolute altitude;
D excavates cavern: model is tamped shaping and after bone dry, carried out cavern excavation, first excavates middle part, transversal section, cavern, the protective effect excavation position, corner of the outer field igelite of recycling model.
2. earthquake simulation shaking table model test cavern as claimed in claim 1 forming method, is characterized in that: in described step a, stiffened increases the weight of the density of polystyrene foam is 22Kg/m 3.
3. earthquake simulation shaking table model test cavern as claimed in claim 1 forming method, it is characterized in that: in described step a, model surface wraps up one deck igelite, its thickness is 1mm.
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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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