CN105388047A - Preparation method of columnar joint fissure network model rock core samples - Google Patents
Preparation method of columnar joint fissure network model rock core samples Download PDFInfo
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- CN105388047A CN105388047A CN201510523431.0A CN201510523431A CN105388047A CN 105388047 A CN105388047 A CN 105388047A CN 201510523431 A CN201510523431 A CN 201510523431A CN 105388047 A CN105388047 A CN 105388047A
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Abstract
The invention relates to a preparation method of a columnar joint fissure network model rock core samples. The preparation method comprises the following steps that 1, organic glass blocks are glued into a three-dimensional joint fissure network with the regular hexagon-shaped cross section and the inclination angle of 30-75 degrees; 2, a mold material is poured into a mold; 3, the organic glass joint fissure network is inserted into the mold material; 4, curing is carried out in a constant temperature and humidity chamber for 7-10 h; 5, the organic glass joint fissure network is pulled out to form a regular columnar joint fissure network gap, and constant temperature curing continues to be carried out for 24-36 h; 6, the mixture of network gap filler and water is poured into the network gap, and natural curing is carried out for 10-15 days; a mold panel is disassembled, and the rock core samples with the different inclination angles, joint thicknesses and joint strengths are obtained. The seepage characteristics of different columnar joint rock bodies can be accurately simulated.
Description
Technical field
The invention belongs to rock engineering field, relate to the preparation method of prismatic jointing Fracture Networks model core sample.
Background technology
Columnar joint structure is common in a kind of in slag in rule or the primary tension fracture structure of principle combinations columnar shape, be more common in Irish touchstone, usually there is following characteristics: (1) profile is four limit bodies, five limit bodies, hexahedron, octagon, normally mutually be entrenched togather, and be tilt in the rock mass of reality, and there is certain inclination angle; (2) joint of prismatic jointing rock mass all tool have the dimensions, the size of size directly affects joint intensity; (3) be not complete crack between joint in actual rock mass, be filled by some loose fragmental productss, have certain intensity between joint, joint intensity changes due to the change of the consolidation strength of the stuff between joint.
Because These characteristics, therefore under acquisition ad-hoc location, core sample also exists the difficulty of financial resources, material resources and technological layer.And comparative study has conveniently, controllability is strong, cost is low and the advantage such as with strong points to utilize the model experiment of analog material to carry out, the method is widely used in the research of study of rocks engineering problem.Little strata model pillar first prepared by existing core sample, then by cementing for its each pillar acquisition, and the uncontrollable and heterogeneity of the thickness of the binder in the middle of existing in core sample, and quite take the problem of man power and material.Application number is the Chinese invention patent of 2013101245872, disclosed in be a kind of cutting method of joint plane, the method just analyzes the mechanical characteristic in shear joint face, does not carry out the mechanical characteristic analysing in depth prismatic jointing rock mass.Application number is the Chinese patent of 2014102608609, disclosed in be a kind of preparation method of shale artificial cores, just a kind ofly generate the core specimen method considering to have the mechanical characteristic of the shale body at longitudinal joint of large scale, can not be used for analyzing the mechanical characteristic of vertical prismatic jointing core.Application number is the Chinese patent of 2014105643869, disclosed in be the preparation method of a kind of irregular prismatic jointing Fracture Networks model core sample, the method just prepares the preparation of the prismatic jointing strata model of the 3D random prismatic jointing Fracture Networks of class voronoi, the column rock mass test that inclination angle is 0 degree can only be prepared, do not further investigate the difformity of column rock mass to the intensity of rock mass and infiltrative impact, different angle is on the impact of the intensity of cylinder.The model test of prismatic jointing Similar Material of Rockmass is just analyzed in the paper " under Uniaxial Compression the distortion of column jointed rock mass and intensity anisotropy model investigation " of Xiao Weimin, but adopt large-sized cylinder in this model investigation, only has a small amount of prismatic jointing grid, size effect could not be overcome, the mechanical characteristic of prismatic jointing rock mass can not be reflected so truly, itself and the compressive strength of column jointed rock mass can only be analyzed at single shaft instrument, because the specimen size done can not utilize more greatly rock tri-axial to analyze the mechanical characteristic of column jointed rock mass, the seepage characteristic of the prismatic jointing rock mass of different joints thickness and joint intensity can not be analyzed simultaneously.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide the preparation method of a kind of prismatic jointing Fracture Networks model core sample, the method can obtain the core sample of different angle, different joints thickness, different joints intensity, the seepage characteristic simulating different prismatic jointing rock mass that can be relatively accurate.
In order to realize above technical goal, adopt following technical scheme:
(1) the joint fissure network that the transverse shape utilizing plexiglass block to be cemented to three-dimensional is regular hexagon, inclination angle is 30 °-75 °; At joint fissure network and detachable U-type groove coating release agent simultaneously;
(2) thickness of organic glass is 1-2mm, and the thickness of organic glass and joint fissure network extract the width in the network space of rear formation;
(3) two relative panels of the U-type groove described in are detachable;
(4) there is 5mm-15mm bottom the distance from bottom U-type groove of organic glass joint fissure network, be convenient to cast material cemented together in bottom, be conducive to follow-uply pouring packing material into.
(5) top of organic glass joint fissure network is higher than U-type groove top, is convenient to extract from U-type groove;
(6) in U-type groove, cast material is poured into; Cast material is the potpourri obtained by the weight ratio of 2-3:1-1.5:1 by cement, sand and water, and the particle diameter of its medium sand is for being less than 1mm;
(7) to the organic glass joint fissure network that inserting step (1) in the U-type groove filling cast material obtains;
(8) be that in the climatic chamber of 95%, maintenance to organic glass joint fissure network is easy to extract and the degree that damage model material is not cementing in temperature 24 °, humidity, standing time 7-10 hour;
(9) after maintenance terminates, two of U-type groove detachable panels are removed, extracts organic glass joint fissure network, Fracture Networks space, formation rule prismatic jointing, then detachable symmetrical panel is installed onto in U-type groove, continue thermostatic curing 24-36 hour;
(10) potpourri of network void filler and water is poured in network space, then U-type groove is placed into natural curing 10-15 days in ventilation; Dismounting U-type groove panel, obtains the prismatic jointing test block of prismatic jointing Fracture Networks.Network void filler can be gypsum, white cement or E44 epoxy resin.
The present invention prepares the artificial prismatic jointing model test sample of different joints thickness, different joints intensity, different angle, is applicable to analyze column jointed rock mass mechanical characteristic and Penetration Signature, and material used is simple, with low cost, simple to operate.Wherein, utilize plexiglass block to make three-dimensional prismatic jointing Fracture Networks, the thickness of organic glass is the joint thickness of simulation; The intensity between different joint is simulated at the joint of different packing material filling cylinder; The consolidation strength of different materials simulates different prismatic jointings intensity.
Accompanying drawing explanation
Fig. 1 for the shape that embodiment 1 is spliced be regular hexagon, inclination angle is the prismatic jointing Fracture Networks figure of 75 °;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is the dismountable U-type groove structural representation of the plane of symmetry; A is the U-type groove not arranging detachable symmetrical panel; B is the U-type groove with detachable symmetrical panel; Wherein, the length × wide × height of U-type groove is 100mm × 100mm × 200mm, and sidewall thickness is 20mm;
Fig. 4 is the side view of the core of the well cutting that embodiment 1 obtains;
Fig. 5 is the inclination angle that embodiment 1 obtains is the pictorial diagram of the Φ 50mm* Φ 100mm cylinder sample of 75 °;
Fig. 6 be the embodiment of the present invention 1 obtain sample at confined pressure 4MPa, osmotic pressure is the stress-strain diagram of 1MPa.Can find out: intensity behind peak does not appear in sample, along with the increase of confined pressure, there is peak value in stress-strain diagram, and residual strength also increases thereupon;
Fig. 7 be in the embodiment of the present invention 1 obtain sample at confined pressure 4mpa, osmotic pressure is the osmotic pressure-strain curve figure under 1mpa.Can as seen from Figure 7: when sample is in the initial densification stage, initial infiltration coefficient reduces with the increase of confined pressure, increases along with the increase of osmotic pressure; When sample enters the linear elasticity stage, infiltration coefficient remains unchanged substantially; After sample enters yielding stage, joint plane is out of shape through gradually, and permeability increasing degree increased than the linear elasticity stage, and when sample enters failure stage, permeability reaches maximal value;
Fig. 8 be the sample that obtains in the embodiment of the present invention 1 confined pressure be 6mpa, osmotic pressure is the permeability-strain and stress-strain curve of 1mpa;
Fig. 9 be the sample that obtains in the embodiment of the present invention 1 confined pressure be 8mpa, osmotic pressure is the permeability-strain and stress-strain curve of 1mpa;
Figure 10 be the permeability of sample that obtains in the embodiment of the present invention 1 under different confined pressure with the variation tendency of axial strain; Can as seen from Figure 10: when seepage pressure is 1MPa, along with the increase (4MPa, 6MPa, 8MPa) of confined pressure, permeability is advanced the speed and reduced gradually.Permeability curve during confined pressure 4MPa is comparatively steep, and principal permeability is 31.08 × 10
-16m
2, permeability maximal value during confined pressure 6MPa is 22.46 × 10
-16m
2, when confined pressure 8MPa, permeability evolution curve is than mild in low confined pressure (4MPa) situation, and the principal permeability reached after sample destroys is 6.67 × 10
-16m
2.
Embodiment
In order to understand the present invention further, be described in more detail the present invention below in conjunction with concrete drawings and Examples, embodiment only to the concrete exemplifications effect of the present invention, and does not have any restrictive effect; The insubstantial modifications that any those skilled in the art make on basis of the present invention, all should belong to the scope of protection of the invention.
Grow abundant difform prismatic jointing shape rock mass in Irish touchstone part rock stratum, Dam Site district, white crane beach, and there is certain inclination angle.Whether the deformation performance of these prismatic jointing Irish touchstone rock mass meets the strict deformation requirements of the induced joint dam foundation, be white crane beach, Jinsha jiang River Hydropower Project faced by one of Main Engineering Geological Problems, therefore the mechanical characteristic of column jointed rock mass under difformity, different angle, different joints thickness, different joints intensity to be analyzed.Following examples will simulate Irish touchstone rock stratum, Dam Site district, white crane beach.
embodiment 1
The preparation method of prismatic jointing Fracture Networks model core sample, comprises the following steps:
(1) the joint fissure network that plexiglass block (thickness 1mm) is cemented to regular hexagon, inclination angle is 75 ° is utilized, as shown in Figure 2; By the organic glass joint fissure network of step (1) and detachable U-type groove (shown in Fig. 3) coating release agent simultaneously;
(2) in U-type groove, cast material is poured into; The cast material adopted in the present embodiment is cement: sand: water=2:1.5:1, and the particle diameter of its medium sand is for being less than 1mm;
(3) to the organic glass joint fissure network that inserting step (1) in the U-type groove filling cast material obtains;
(4) be that in the climatic chamber of 95%, maintenance to organic glass joint fissure network is easy to extract and the degree that damage model material is not cementing (about 7 hours standing times of the present embodiment) in temperature 24 °, humidity;
(5) the detachable symmetrical panel of U-type groove is removed, extract Fracture Networks space, organic glass joint fissure network formation rule prismatic jointing, then detachable symmetrical panel is installed onto in U-type groove, continue thermostatic curing 25 hours;
(6) be, after the gypsum liquid of 2:1 mixes, pour in network space by water cement ratio, then U-type groove be placed in ventilation natural curing 12 days; Dismounting U-type groove panel, obtains the prismatic jointing test block of the regular hexagon prismatic jointing Fracture Networks at 75 °, inclination angle, as Fig. 4; By prismatic jointing test block through cutting and be polished into the regular hexagon prismatic jointing Fracture Networks column core sample that the inclination angle of standard is the standard of 75 °, be of a size of Φ 50mm × Φ 100mm, as Fig. 6 and Fig. 7.
On-the-spot prismatic jointing, the white crane beach rock mass that the model sample obtained can be used for simulating regular hexagon cylinder, joint thickness is 1mm, filling material is gypsum, cylinder inclination angle is 75 °, thus mechanical characteristic, the seepage characteristic of rock mass is measured by rock tri-axial TRIAXIALCELLV3.。
embodiment 2
Difference from Example 1 content is as follows:
In step (1), organic glass thickness 1mm, joint fissure network inclination angle is 30 °;
Cast material in step (3) is cement: sand: water=2:1:1;
Maintenance standing time of step (5) is 8h;
In step (6), after extracting joint fissure network, cast material continues maintenance 23 hours in thermostatic curing room;
In step (7), the white cement of the packing material in network space to be water cement ratio be 2:1, and to natural curing in ventilation 10 days; Obtain the regular hexagon prismatic jointing Fracture Networks model criteria sample that joint thickness is 1.5mm, inclination angle is 30 °, the filling material at joint is white cement.
Embodiment 3
Difference from Example 1 content is as follows:
In step (1), organic glass thickness 2mm, joint fissure network inclination angle is 45 °;
Cast material in step (3) is cement: sand: water=3:1:1;
Maintenance standing time of step (5) is 10h;
In step (6), after extracting joint fissure network, cast material continues maintenance 24 hours in thermostatic curing room;
In step (7), the packing material in network space is by E44 epoxy resin: the mass ratio of curing agent ethylene diamine is the potpourri of 1:0.1, and to natural curing in ventilation 11 days; Obtain the regular hexagon prismatic jointing Fracture Networks model criteria sample that joint thickness is 2mm, inclination angle is 45 °, the filling material at joint is E44 epoxy resin.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. the preparation method of prismatic jointing Fracture Networks model core sample, is characterized in that comprising the following steps:
(1) the joint fissure network that the transverse shape utilizing plexiglass block to be cemented to three-dimensional is regular hexagon, inclination angle is 30 °-75 °; The coating release agent while of in joint fissure network and mould;
(2) in mould, cast material is poured into;
(3) to the organic glass joint fissure network that inserting step (1) in the mould filling cast material obtains;
(4) in climatic chamber, maintenance to organic glass joint fissure network is easy to extract and the degree that damage model material is not cementing, and standing time is 7-10 hour;
(5) after maintenance terminates, remove mould both sides panel, extract organic glass joint fissure network, Fracture Networks space, formation rule prismatic jointing, then by the panel of installation mold both sides, continue thermostatic curing 24-36 hour;
(6) potpourri of network void filler and water is poured in network space, then mould is placed into natural curing 10-15 days in ventilation; Dismounting mold panel, obtains the prismatic jointing test block of prismatic jointing Fracture Networks.
2. the preparation method of prismatic jointing according to claim 1 Fracture Networks model core sample, it is characterized in that the thickness of organic glass is 1-2mm in step (1), end 5mm-15mm in the distance from bottom mould of organic glass joint fissure network, top is higher than die top.
3. the preparation method of prismatic jointing according to claim 1 Fracture Networks model core sample, it is characterized in that the mould described in step (1) is U-type groove, two relative panels are detachable.
4. the preparation method of prismatic jointing according to claim 1 Fracture Networks model core sample, it is characterized in that the cast material in step (2) is the potpourri obtained by the weight ratio of 2-3:1-1.5:1 by cement, sand and water, the particle diameter of its medium sand is for being less than 1mm.
5. the preparation method of prismatic jointing according to claim 1 Fracture Networks model core sample, is characterized in that the temperature of the climatic chamber of step (4) is 24 DEG C, humidity is 95%.
6. the preparation method of prismatic jointing according to claim 1 Fracture Networks model core sample, is characterized in that step (6) network void filler is gypsum, white cement or E44 epoxy resin.
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| CN106840880A (en) * | 2017-02-08 | 2017-06-13 | 河海大学 | The method that prismatical joint rockmass anisotropy characteristic is determined based on Brazilian diametral compression test |
| CN106840800A (en) * | 2017-03-01 | 2017-06-13 | 河海大学 | A kind of rocks preparation method of sample containing polygonal Joint network simulation |
| CN107655739A (en) * | 2017-10-31 | 2018-02-02 | 河海大学 | A kind of tackling prepared for cuboid prismatical joint rock mass sample |
| CN108414304A (en) * | 2017-10-11 | 2018-08-17 | 同济大学 | A kind of mold and method made for coupled shear-flow test joint samples |
| CN110261225A (en) * | 2019-07-01 | 2019-09-20 | 重庆大学 | Multi- scenarios method drop-down-shear fracture experiment the production method of core containing joint fissure |
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| CN106840800B (en) * | 2017-03-01 | 2019-09-24 | 河海大学 | A kind of rocks preparation method of sample of the Joint network simulation containing polygonal |
| CN108414304A (en) * | 2017-10-11 | 2018-08-17 | 同济大学 | A kind of mold and method made for coupled shear-flow test joint samples |
| CN107655739A (en) * | 2017-10-31 | 2018-02-02 | 河海大学 | A kind of tackling prepared for cuboid prismatical joint rock mass sample |
| CN107655739B (en) * | 2017-10-31 | 2020-03-17 | 河海大学 | A tackling that is used for preparation of cuboid columnar joint rock mass sample |
| CN110261225A (en) * | 2019-07-01 | 2019-09-20 | 重庆大学 | Multi- scenarios method drop-down-shear fracture experiment the production method of core containing joint fissure |
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