CN105651570A - Preparation method of columnar jointed rock mass sample containing unfilled blind joints - Google Patents
Preparation method of columnar jointed rock mass sample containing unfilled blind joints Download PDFInfo
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- CN105651570A CN105651570A CN201511016772.5A CN201511016772A CN105651570A CN 105651570 A CN105651570 A CN 105651570A CN 201511016772 A CN201511016772 A CN 201511016772A CN 105651570 A CN105651570 A CN 105651570A
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- rock mass
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- blind joint
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
Abstract
The invention relates to a preparation method of a columnar jointed rock mass sample containing unfilled blind joints. The preparation method comprises the following steps: simulating the structure and the form of blind joints in an actual columnar jointed rock mass, and determining 3D (Three-Dimensional) digital space models of various blind joints in the columnar jointed rock mass sample; three-dimensionally printing the SD space models of the different types of blind joints by adopting a water-soluble material, thus obtaining different types of blind joint simulation components, and coating the surfaces of the obtained blind joint simulation components with hot melt glue; preparing cement mortar to simulate the actual columnar jointed rock mass, mixing and stirring the blind joint simulation components with the cement mortar, pouring a mixture into a mold, and curing until forming a sample component; demoulding; carrying out baking, water saturation, drying, curing and machining treatment on the demoulded sample component, thus obtaining the columnar jointed rock mass sample. According to the preparation method disclosed by the invention, a 3D printing technology is used for preparing the blind joint simulation components, so that the form and the structure of the blind joints are accurately controlled; the water-soluble material is adopted for preparing the blind joint simulation components, so that the problem that a component for simulating the blind joints cannot be taken out is solved during sample preparation.
Description
Technical field
The present invention relates to the preparation method of a kind rock mass sample, it is specifically related to a kind of preparation method containing the prismatic jointing rock mass sample without filling blind joint, belongs to rock mechanics field.
Background technology
Prismatic jointing is owing to what cooling meat was formed constructs in primary tension fracture that is irregular or conformation of rules in slag eruption overflow process, prismatic jointing occurs in basalt more, in the extensively distribution of Southwestern China area, southwest is many built or be positioned on the basalt of prismatic jointing building large sized hydropower station. Prismatic jointing rock mass is as a kind of rock mass with special construction, joint plane between its post not only with exposure, implicit joint plane is also had in post, it is called blind joint, due to the existence of joint and blind joint between the rock mass post of prismatic jointing, prismatic jointing rock mass is caused to have the anisotropy of significant mechanics and penetration property, on engineering safety impact significantly, therefore study the mechanics of prismatic jointing rock mass and the anisotropy of penetration property, there is higher reality and construction value.
Test is a kind of research method that rock mechanics field often adopts, more than prismatic jointing rock mass includes, group joint and columnar volume are bigger, by the restriction of shop experiment specimen size size, the natural rock sample got at engineering site, only containing one group or do not comprise joint, can not fully reflect the anisotropy of prismatic jointing rock mass, and the polytropy due to prismatic jointing rock mass geometric properties, different ROCK MASS JOINT differs greatly, the test-results of the natural rock sample taking from part rock mass does not have abundant representativeness, therefore the method for artificial sample preparation is usually selected to prepare prismatic jointing rock sample, but the method preparing column jointed rock mass artificial rock at present is also incomplete, only can prepare the prismatic jointing rock mass sample at joint between the post only containing exposure, also there is no the preparation of effective method containing the prismatic jointing rock mass sample without filling blind joint, but the mechanics of column jointed rock mass and Penetration Signature and anisotropy are had significant impact by blind joint, ignore the character that blind joint just can not fully simulate actual engineering site prismatic jointing rock mass, therefore how to prepare and become rock mechanics experiment field urgent problem containing the prismatic jointing rock mass sample without filling blind joint.
Summary of the invention
Goal of the invention: it is an object of the invention to provide a kind of preparation method containing the prismatic jointing rock mass sample without filling blind joint, the sample that the method obtains can intactly reflect the Structure and form of the inner blind joint of prismatic jointing rock mass.
Technical scheme: the present invention relates to a kind of preparation method containing the prismatic jointing rock mass sample without filling blind joint, comprise the steps:
(1) structure, the form of blind joint in the rock mass of actual prismatic jointing is simulated, it is determined that the 3-dimensional digital space model of all kinds blind joint in sample to be prepared;
(2) adopt water-soluble material to carry out 3D printing the 3-dimensional digital space model of dissimilar blind joint, obtain dissimilar blind joint simulation component, simulate component surface at gained blind joint and smear hot melt adhesive;
(3) simulate the mechanical property preparation sand-cement slurry of actual prismatic jointing rock mass, pour in mould after blind joint is simulated component and sand-cement slurry mix and blend, maintenance, make that cement mortar solidification is shaping, formation sample component;
(4) by the sample component demoulding;
(5) toasting sample component to melt completely to hot melt adhesive, then carry out full water, dissolve completely to blind joint simulation component, oven dry, maintenance, processing treatment, obtains containing the prismatic jointing rock mass sample without filling blind joint.
3D printing technique is simulated component for the preparation of blind joint by the present invention, it is possible to the accurately roughness of the size of control blind joint, spatial shape, joint plane; Adopt water-soluble material to prepare blind joint and simulate component, by the component of completely full for sample component water and solubilized simulation blind joint, solve preparation containing the problem cannot taken out without the component of simulation blind joint during filling blind joint sample.
Preferably, water-soluble material is PVA material.
Concrete, in step (5), the sample component after baking is put into water and carries out vacuumizing full water. Vacuumizing full water can allow sample component reach water-saturated state fast, and moisture fully enters into sample component inside.
Preferably, the part that the mould in step (3) contacts with sand-cement slurry is made up of cochrome material, and smears hot melt adhesive at this part surface. The cohesive force of hot melt adhesive and cochrome is more weak, the cohesive force of sand-cement slurry is relatively strong, hot melt adhesive is evenly spread upon the surface of cochrome mould, before cement mortar solidification forms sample component, block the bonding of sand-cement slurry and mould, avoid the structure destroying sample component during the follow-up demoulding.
Further, in step (3), described mold bottom establishes Packed pore, during the demoulding, this pore is released sealing, blasts air from pore, sample component is deviate from from mould in mould. It is convenient in demoulding quick, and the structure of sample component can not be destroyed.
Preferably, in step (2), the thickness of the hot melt adhesive smeared is 0.5��0.6mm. Now, simulation blind joint face that extremely thin hot melt adhesive can be complete or the roughness on actual rock mass surface.
Concrete, in step (5), the sample component after maintenance is obtained containing the prismatic jointing rock mass sample without filling blind joint through bonding, cutting, polishing.
Useful effect: compared with prior art, it is an advantage of the current invention that:
(1) 3D printing technique is applied to the making containing the prismatic jointing rock mass sample without filling blind joint by the present invention first, adopt the 3-dimensional digital space model can the type of blind joint, size, spatial shape and roughness in prismatic jointing rock mass sample prepared by complete performance, the component of simulation blind joint is made by 3D printing technique, 3-dimensional digital space model accurately can be printed as physical model, can accurately control the size of blind joint, spatial shape, the roughness of joint plane;Meanwhile, the present invention adopts water-soluble material to prepare blind joint simulation component, and completely full water gets final product the component simulating blind joint in dissolved samples parts, solves preparation and contains without the problem that blind joint in filling blind joint sample is simulated component and cannot be taken out; And, smear hot melt adhesive in component surface, prevent component with sand-cement slurry contact process in dissolve;
(2) by adopting cochrome to prepare in mould the part contacted with sand-cement slurry, and smear hot melt adhesive in this part, the bonding of sand-cement slurry and mould can be avoided, make the shaping sample can not the effectively demoulding;
(3) by the reserved aperture of mold bottom, when the demoulding, by blasting air from aperture in mould, sample component being ejected mould, fast demoulding, it is convenient in demoulding quick, the structure of sample component or wherein blind joint can not be destroyed;
(4) method of the present invention is simple to operate, efficiently, fast, applied range, can prepare according to actual needs dissimilar containing complex construction without filling blind joint prismatic jointing rock mass sample, for making containing opening new approaches without filling blind joint rock mass sample.
Accompanying drawing explanation
Fig. 1 is the schema of the preparation method containing the prismatic jointing rock mass sample without filling blind joint of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme of the present invention is described further.
As shown in Figure 1, a kind of preparation method containing the prismatic jointing rock mass sample without filling blind joint of the present invention, comprises the steps:
(1) structure, the form of blind joint in actual prismatic jointing rock mass is simulated, such as the number of types of blind joint, size, spatial shape, roughness etc., it is determined that the 3-dimensional digital space model of all kinds blind joint in sample to be prepared;
(2) adopt water-soluble material, such as PVA material, by 3D printing technique, the 3-dimensional digital space model of dissimilar blind joint is printed as dissimilar blind joint and simulates component, and simulate component surface at gained blind joint and smear hot melt adhesive;
Blind joint simulate component surface smear hot melt adhesive, can prevent component with sand-cement slurry contact process in meet water dissolution; In order to the roughness in simulation blind joint face that can be complete, can by smear hot melt adhesive gauge control at 0.5��0.6mm; The thermosol gelgun of high precision can be adopted to smear hot melt adhesive, and high precision thermosol gelgun can control the volume of hot melt adhesive ejection accurately, and the precision of the hot melt adhesive smeared can control at about 0.1mm.
(3) simulate the mechanical property preparation sand-cement slurry of prismatic jointing rock mass, pour mould into after various types of blind joint is simulated component and sand-cement slurry mix and blend, then carry out maintenance, make that cement mortar solidification is shaping, formation sample component;
The part that mould contacts with sand-cement slurry can adopt cochrome material to make, and smear hot melt adhesive at this part surface, owing to the cohesive force of hot melt adhesive and cochrome is more weak, the cohesive force of sand-cement slurry is stronger, hot melt adhesive is evenly spread upon the surface of cochrome mould, before cement mortar solidification forms sample component, block the bonding of sand-cement slurry and mould, avoid the structure destroying sample component during the follow-up demoulding.
Same, in order to the roughness on simulation rock mass surface that can be complete, can by smear hot melt adhesive gauge control at 0.5��0.6mm; The thermosol gelgun of high precision can be adopted to smear hot melt adhesive, and high precision thermosol gelgun can control the volume of hot melt adhesive ejection accurately, and the precision of the hot melt adhesive smeared can control at about 0.1mm.
(4) by the sample component demoulding;
Can establishing Packed pore at mold bottom in advance, during the demoulding, this pore be released sealing, blasts air from pore in mould, sample component can be deviate from from mould; The method is convenient in demoulding fast, and can not destroy sample component and the structure of inner blind joint.
(5) toast sample component to melt completely to hot melt adhesive, then full water is carried out, until blind joint simulation component dissolves completely, sample component after baking can be put into water to carry out vacuumizing full water, vacuumizing full water can allow sample component reach water-saturated state fast, and moisture fully enters into sample component inside; Then take out the sample component after oven dry, maintenance, maintenance through processing treatment, such as bonding, cutting, polishing, obtain containing the prismatic jointing rock mass sample without filling blind joint.
3D printing technique is applied to the making containing the prismatic jointing rock mass sample without filling blind joint by the present invention, concrete, 3D printing technique is simulated component for the preparation of blind joint, can accurately control the roughness of the size of blind joint, spatial shape, joint plane, intactly reflect the Structure and form of the inner blind joint of prismatic jointing rock mass; And adopt water-soluble material to prepare blind joint simulation component, by completely full for sample component water, blind joint simulation component can dissolve completely, solves preparation and contains without the problem that blind joint during filling blind joint sample is simulated component and cannot be taken out.
Embodiment
To prepare dam foundation place, some hydropower station riverbed containing the prismatic jointing rock mass rock sample without filling blind joint, the preparation method containing the prismatic jointing rock mass sample without filling blind joint of the present invention is as follows:
(1) according to the geologic information of this dam foundation place, riverbed, power station prismatic jointing rock mass, the type of blind joint in the rock mass sample of prepared prismatic jointing is determined according to similar relation, quantity, size, spatial shape, roughness, make the 3-dimensional digital space model of dissimilar blind joint in sample.
(2) by the 3-dimensional digital space model input 3D printer of blind joint, water-soluble PVA material is adopted to print out dissimilar blind joint simulation component respectively, printed the size of blind joint simulation component, spatial shape, surfaceness, fully simulate the form of blind joint in engineering site rock mass, and evenly smear one layer of extremely thin hot melt adhesive at this component surface thermosol gelgun, thickness is 0.5��0.6mm, hot melt adhesive can closely be bonded at blind joint simulation component surface, can not come off in the process stirring sand-cement slurry, avoid simultaneously blind joint simulation component with sand-cement slurry contact process in dissolve.
(3) mechanical property of prismatic jointing sillar is simulated, it is that sample prepared by raw material taking sand-cement slurry, the proportioning of sand-cement slurry is determined according to similar relation, finally determine that sample is by ordinary Portland cement, natural river sand and water in mass ratio example 1:0.5:0.4 mix, wherein sand grains footpath in river is less than 1mm, add permeability-reducing admixture and the water reducer of total mass 0.5%, the barrier performance of reinforcement material and the mobility of cement, reduction holes porosity, add a little defoamer, reduce the bubble in cement hydration process and produce. According to determined prismatic jointing rock mass sample contains the type of blind joint and the quantity of every type blind joint, blind joint simulation component and the sand-cement slurry of putting into respective type and quantity fully stir, and blind joint simulation component is uniformly distributed in sand-cement slurry. The mould adopting cochrome material to make makes sand-cement slurry shaping, mold bottom establishes Packed pore, and the part contacted with sand-cement slurry at mould inside evenly smears hot melt adhesive, pour uniform for stirring sand-cement slurry and blind joint simulation component into mould, it it is 22 DEG C in temperature, humidity be 90% climatic chamber in maintenance shaping to cement mortar solidification, formed sample component.
(4) the sealing pore of mold bottom is opened, in mould, blast air from pore, sample component is deviate from from mould.
(5) sample component after the demoulding is put into baking oven toast with the temperature of 80 DEG C, ensure spread upon blind joint simulation component surface hot melt adhesive melt completely after, sample component is put into normal-temperature water and vacuumizes full water 2-4 hour, after guaranteeing that blind joint simulation component dissolves completely, take out and dry. Then temperature 22 DEG C, in the climatic chamber of humidity 90%, maintenance is after 33 days, through bonding, cutting, polishing, obtains containing the prismatic jointing rock mass sample without filling blind joint.
Claims (7)
1. the preparation method containing the prismatic jointing rock mass sample without filling blind joint, it is characterised in that, comprise the steps:
(1) structure, the form of blind joint in the rock mass of actual prismatic jointing is simulated, it is determined that the 3-dimensional digital space model of all kinds blind joint in sample to be prepared;
(2) adopt water-soluble material to carry out 3D printing the 3-dimensional digital space model of dissimilar blind joint, obtain dissimilar blind joint simulation component, simulate component surface at gained blind joint and smear hot melt adhesive;
(3) simulate the mechanical property preparation sand-cement slurry of actual prismatic jointing rock mass, pour in mould after blind joint is simulated component and sand-cement slurry mix and blend, maintenance, make that cement mortar solidification is shaping, formation sample component;
(4) by the sample component demoulding;
(5) toasting sample component to melt completely to hot melt adhesive, then carry out full water, dissolve completely to blind joint simulation component, oven dry, maintenance, processing treatment, obtains containing the prismatic jointing rock mass sample without filling blind joint.
2. the preparation method containing the prismatic jointing rock mass sample without filling blind joint according to claim 1, it is characterised in that, in step (5), the sample component after baking is put into water and carries out vacuumizing full water.
3. the preparation method containing the prismatic jointing rock mass sample without filling blind joint according to claim 1, it is characterized in that, the part that mould in step (3) contacts with sand-cement slurry is made up of cochrome material, and smears hot melt adhesive at this part surface.
4. according to any one of claim 1-3 containing the preparation method of prismatic jointing rock mass sample without filling blind joint, it is characterized in that, in step (3), described mold bottom establishes Packed pore, during the demoulding, this pore is released sealing, in mould, blasts air from pore, sample component is deviate from from mould.
5. the preparation method containing the prismatic jointing rock mass sample without filling blind joint according to claim 1, it is characterised in that, described water-soluble material is PVA material.
6. according to any one of claim 1-3 containing the preparation method of prismatic jointing rock mass sample without filling blind joint, it is characterised in that, the thickness of the hot melt adhesive smeared is 0.5��0.6mm.
7. the preparation method containing the prismatic jointing rock mass sample without filling blind joint according to claim 1, it is characterized in that, in step (5), the sample component after maintenance is obtained containing the prismatic jointing rock mass sample without filling blind joint through bonding, cutting, polishing.
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| CN106769341A (en) * | 2017-03-09 | 2017-05-31 | 河海大学 | A kind of rocks sample preparation device and preparation method containing blind joint |
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