CN103954499B - A kind of rock confined pressure loading experimental apparatus and experimental technique - Google Patents

A kind of rock confined pressure loading experimental apparatus and experimental technique Download PDF

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CN103954499B
CN103954499B CN201410080149.5A CN201410080149A CN103954499B CN 103954499 B CN103954499 B CN 103954499B CN 201410080149 A CN201410080149 A CN 201410080149A CN 103954499 B CN103954499 B CN 103954499B
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steel plate
inner panel
side steel
pressurization inner
pressurization
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CN103954499A (en
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夏彬伟
宋晨鹏
卢义玉
杨冲
葛兆龙
汤积仁
刘承伟
赵彬钦
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Chongqing University
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Chongqing University
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Abstract

The present invention relates to a kind of rock confined pressure loading experimental apparatus and experimental technique, described experimental provision includes by front side steel plate, left side steel plate, rear side steel plate, right side steel plate, goes to the bottom steel plate and casing that upper cover steel plate surrounds, described front side steel plate, left side steel plate and upper cover steel plate each run through and has several pilot hole and several screwed hole in array distribution, described pilot hole penetrates pressurization inner panel guide blot, described screwed hole has been provided with pre-stressed bolt;The bottom of described pressurization inner panel guide blot is fixedly connected with pressurization inner panel, and described pressurization inner panel offsets with the bottom of pre-stressed bolt.This programme solves the problem that existing apparatus structure is complicated, cost is high, be not suitable for the loading experiment of less stress.

Description

A kind of rock confined pressure loading experimental apparatus and experimental technique
Technical field
The present invention relates to confined pressure charger, specifically a kind of rock confined pressure loading experimental apparatus and experimental technique.
Background technology
Rock Mechanics Test analogue technique is to simulate part engineering structure in Geotechnical Engineering to study, the subject material of simulation is mainly rock mass, it generally uses the ratio that reduces or in particular cases makes model by the ratio amplified at certain, and then the change by being there is model upper stress, the observation of strain and rock mass structure judges and Changing Pattern and the Changing Pattern of structure recognizing the stress-strain occurred in the prototype (simulation entity) of simulation.Rock Mechanics Test analogue technique is based on the theory of similarity, in the middle of simulation process, simulates, by the ratio etc. reducing simulation entity and suffered stress gravity, the true stress situation that rock mass is suffered at the scene.
Based on the above, want to reach the final purpose of rock simulation experiment, first have to correctly to simulate equipment and the device of true stress condition.Rock confined pressure experiment charger can solve, by the conversion of the theory of similarity, the corresponding stress that model is subject to, and then simulates the rock mass deformation destruction situation under stress truly.Normal triaxial pressure test have studied confined pressure to rock deformation and the impact of destruction, which employs triaxial stress loading experimental apparatus.But current triaxial stress loading experimental apparatus still tends to maximize, and structure is complex, therefore brings inconvenience and the waste of resource greatly to experiment.
As disclosed in CN 203117046 U, a kind of three-dimensional rigidity loads rock true triaxil tester, and this triaxial apparatus includes triaxial pressure box, true triaxial rock sample overcoat and servo rigidity compression system.Under the effect of servo rigidity compression system, the piston rod of pressure cylinder drives increased pressure board to move by pressurization cushion block, and pressure is added on sample equably by cube Stiff Block.The purpose of this triaxial apparatus is by arranging hard and soft mixing pressurization lamellar body, it is ensured that sample and the hard and soft mixing the most corresponding compression of pressurization lamellar body, so that the internal face of increased pressure board remains at grade with the hard and soft lateral surface mixing pressurization lamellar body.The pressure source of this triaxial apparatus is servo rigidity compression system, and servo rigidity compression system is generally made up of pressure cylinder, motor etc., it is known that, the accuracy of motor to be controlled output, difficulty is bigger, this makes this triaxial apparatus when applying less force value, and accuracy is difficult to ensure that, is therefore not suitable for applying small size sample the situation of less force value;It addition, the structure complexity that this servo rigidity compression system also makes this triaxial apparatus increases, cost increase, volume is relatively big, for experimental situation limited in the case of the most inapplicable.Except this, CN Disclosed in 103471914 A, bump true triaxial simulation experiment system there is also similar problem.
Summary of the invention
It is an object of the invention to provide a kind of rock confined pressure loading experimental apparatus, its simple in construction, can be with accurate simulation rock stress state under the conditions of true three-dimensional crustal stress, it is possible to simplify the loading equipemtn of confined pressure;Can solve existing apparatus structure complicated, cost is high, the problem not being suitable for the loading experiment of less stress.
Technical scheme is as follows:
A kind of rock confined pressure loading experimental apparatus, including by front side steel plate, left side steel plate, rear side steel plate, right side steel plate, go to the bottom steel plate and casing that upper cover steel plate surrounds, described front side steel plate, left side steel plate, rear side steel plate and right side Interal fixation are being gone to the bottom on steel plate, described front side steel plate, left side steel plate and upper cover steel plate each run through and has several pilot hole and several screwed hole in array distribution, described pilot hole penetrates pressurization inner panel guide blot, described screwed hole has been provided with pre-stressed bolt;
It is provided with in the inner side of described front side steel plate parallel with front side steel plate rear to pressurization inner panel, fixes with the bottom of pressurization inner panel guide blot on the steel plate of front side described backward pressurization inner panel before and be connected and offset with the bottom of pre-stressed bolt on the steel plate of front side;
Be provided with the dextrad pressurization inner panel parallel with left side steel plate in the inner side of described left side steel plate, the left side of described dextrad pressurization inner panel is fixed with the bottom of the inner panel guide blot that pressurizes on the steel plate of left side and is connected and offsets with the bottom of pre-stressed bolt on the steel plate of left side;
Be provided with parallel with upper cover steel plate lower to pressurization inner panel in the inner side of described upper cover steel plate, described lower on above and the upper cover steel plate of pressurization inner panel the bottom of pressurization inner panel guide blot fix and be connected and offset with the bottom of pre-stressed bolt on upper cover steel plate;
The surrounding of described upper cover steel plate is protruding with cover rim down, and described cover rim covers in front side steel plate, left side steel plate, rear side steel plate and the outside of right side steel plate, and described cover rim is detachable pin with front side steel plate, left side steel plate, rear side steel plate and right side steel plate and is connected.
Rock sample is placed in the steel plate of going to the bottom in this experimental provision casing, by to pre-stressed bolt apply moment, make pre-stressed bolt to the backward pressurization inner panel in casing, dextrad pressurization inner panel and lower to pressurization inner panel three pieces pressurization inner panel pressurization to rock sample produce applied stress.Owing to casing stress loading in three directions is separate and is independent of each other, it is possible to the combined stree under simulation true three-dimension stress condition;Additionally, apply moment to be realized by torque spanner, the moment that torque spanner is applied changes into the bolt vertical stress to pressurization inner panel, then it is applied on rock sample, the moment that the big I of pressurization inner panel applying stress is applied by pre-stressed bolt by torque spanner converts, and thus controls the stress being applied on rock sample.
The corresponding respective pressurization inner panel distribution of several screwed holes in array distribution, to ensure that the extruding force of pressurization inner panel is evenly distributed by pre-stressed bolt, the i.e. pressurization active force that is applied on rock sample of inner panel is uniform, regulate each pre-stressed bolt with ensure the stationarity of applying stress and uniformity.Pressurization inner panel, for the location of the inner panel that pressurizes, is play the guiding role on vertical direction and horizontal direction by pressurization inner panel guide blot.Cover rim pin detachable with box body wall is connected, and facilitates picking and placeing of rock sample.
Further, for ensureing that rock sample can be exerted a force by pressurization inner panel, described backward pressurization inner panel movable distance in described casing is more than the distance of front side steel plate to dextrad pressurization inner panel;Described dextrad pressurization inner panel movable distance in described casing is more than left side steel plate to the rear distance to pressurization inner panel;Described lower to pressurization inner panel movable distance in described casing more than upper cover steel plate to dextrad pressurize inner panel, after to pressurization inner panel in small distance.
Further, intensity for guard box body wall, described front side steel plate, left side steel plate, rear side steel plate, right side steel plate, go to the bottom steel plate, backward pressurization inner panel, dextrad pressurization inner panel and lower to pressurization inner panel be square carbon steel plate, described front side steel plate, left side steel plate, rear side steel plate and the base of right side steel plate are groove seamless welding with the side of steel plate of going to the bottom, the left side of described front side steel plate and the front of left side steel plate, the back of left side steel plate and the left side of rear side steel plate, the right of rear side steel plate and the back of right side steel plate, the front of steel plate, right side is groove seamless welding with the right of front side steel plate.
Meanwhile, the method that present invention also offers rock confined pressure loading experiment that is a kind of simple to operate and that be applicable to less stress, the method comprises the following steps:
The first step, pours the rock sample required for experiment according to requirement of experiment, and sample dimensions is mated with the size of described rock confined pressure loading experimental apparatus;
Second step, is placed on a steady and spacious place by rock confined pressure loading experimental apparatus, and the inner panel that backward pressurization inner panel and dextrad pressurizeed is connected in casing by pressurization inner panel guide blot respectively;
3rd step, what rock sample was placed into casing goes to the bottom on steel plate, rock sample completely attaches to backward pressurization inner panel and dextrad pressurization inner panel, by pre-stressed bolt, backward pressurization inner panel and dextrad pressurization inner panel is applied a small amount of active force, rock sample is slightly compressed to the right side of casing at the rear corners;
4th step, is connected to lower on upper cover steel plate by pressurization inner panel guide blot to pressurization inner panel, and the cover rim of upper cover steel plate is connected anchoring with wall box;
5th step, all installs the pre-stressed bolt on casing, first by common wrench, pre-stressed bolt is carried out pretension until stud base arrives to the inner panel that pressurizes;
6th step, three identical torque spanners are adjusted to the applying moment converted, locking, synchronize to apply moment by amount to the pre-stressed bolt in three directions on front side steel plate, left side steel plate, upper cover steel plate, first four angle loading stresses to each pressurization inner panel, synchronize to load remaining pre-stressed bolt the most in three directions;
7th step, for the first time after confined pressure loaded, repeats rock sample to load until not having creep to produce.
The confined pressure loading experimental apparatus of this programme and experimental technique are particularly suited for indoor small confined pressure rock mechanics simulation experiment, not only can be with accurate simulation stress state under the conditions of true three-dimensional crustal stress, and loading equipemtn and the method operation of confined pressure can be simplified, reduce cost.By the simplification loaded is simulated, obtain the architectural characteristic under rock true three-dimension stress.Therefore it is significant at aspects such as raising simulation experiment precision and the scales reducing simulation experiment.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the cross sectional view of the present invention;
Fig. 3 is the cut-away section structure chart of the present invention;
Fig. 4 is the schematic diagram of upper cover steel plate of the present invention;
Fig. 5 is that the present invention pressurizes the schematic diagram of inner panel.
Description of reference numerals: steel plate on front side of 1-;Steel plate on the left of 2-;Steel plate on rear side of 3-;Steel plate on the right side of 4-;5-goes to the bottom steel plate;6-upper cover steel plate;8-pressurizes inner panel guide blot;9-pilot hole;10-screwed hole;11-connecting pin bores;12-pre-stressed bolt;61-cover rim;To pressurization inner panel after 71-;72-dextrad pressurization inner panel;To pressurization inner panel under 76-.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
See a kind of rock confined pressure loading experimental apparatus shown in Fig. 1 ~ 5, including by front side steel plate 1, left side steel plate 2, rear side steel plate 3, right side steel plate 4, go to the bottom steel plate 5 and casing that upper cover steel plate 6 surrounds, described front side steel plate 1, left side steel plate 2, rear side steel plate 3 and right side steel plate 4 are fixed on goes to the bottom on steel plate 5, described front side steel plate 1, left side steel plate 2 and upper cover steel plate 6 each run through and has several pilot hole 9 and several screwed hole 10 in array distribution, described pilot hole 9 penetrates pressurization inner panel guide blot 8, described screwed hole 10 has been provided with pre-stressed bolt 12;
It is provided with in the inner side of described front side steel plate 1 parallel with front side steel plate 1 rear to pressurization inner panel 71, fixes with the bottom of pressurization inner panel guide blot 8 on front side steel plate 1 described backward pressurization inner panel 71 before and be connected and offset with the bottom of pre-stressed bolt 12 on front side steel plate 1;
Be provided with the dextrad pressurization inner panel 72 parallel with left side steel plate 2 in the inner side of described left side steel plate 2, the left side of described dextrad pressurization inner panel 72 is fixed with the bottom of the inner panel guide blot 8 that pressurizes on left side steel plate 2 and is connected and offsets with the bottom of pre-stressed bolt 12 on left side steel plate 2;
Be provided with parallel with upper cover steel plate 6 lower to pressurization inner panel 76 in the inner side of described upper cover steel plate 6, described lower on above and the upper cover steel plate 6 of pressurization inner panel 76 bottom of pressurization inner panel guide blot 8 fix and be connected and offset with the bottom of pre-stressed bolt 12 on upper cover steel plate 6;
The surrounding of described upper cover steel plate 6 is protruding with cover rim 61 down, described cover rim 61 covers in front side steel plate 1, left side steel plate 2, rear side steel plate 3 and the outside of right side steel plate 4, and described cover rim 61 is detachable pin with front side steel plate 1, left side steel plate 2, rear side steel plate 3 and right side steel plate 4 and is connected.
What rock sample was placed in this experimental provision casing go to the bottom steel plate 5, by pre-stressed bolt 12 is applied moment, make pre-stressed bolt 12 to the backward pressurization inner panel 71 in casing, dextrad pressurization inner panel 72 and lower to pressurization inner panel 76 3 pieces pressurization inner panel pressurization to rock sample produce applied stress.Owing to casing stress loading in three directions is separate and is independent of each other, it is possible to the combined stree under simulation true three-dimension stress condition;Additionally, apply moment to be realized by torque spanner, the moment that torque spanner is applied changes into the bolt vertical stress to pressurization inner panel, then it is applied on rock sample, the moment that the big I of pressurization inner panel applying stress is applied by pre-stressed bolt 12 by torque spanner converts, and thus controls the stress being applied on rock sample.
The corresponding respective pressurization inner panel of several screwed holes 10 in array distribution is distributed, to ensure that the extruding force of pressurization inner panel is evenly distributed by pre-stressed bolt 12, the i.e. pressurization active force that is applied on rock sample of inner panel is uniform, regulate each pre-stressed bolt 12 with ensure the stationarity of applying stress and uniformity.Pressurization inner panel, for the location of the inner panel that pressurizes, is play the guiding role on vertical direction and horizontal direction by pressurization inner panel guide blot 8.Cover rim 61 pin detachable with box body wall is connected, and facilitates picking and placeing of rock sample.
Further, for ensureing that rock sample can be exerted a force by pressurization inner panel, the described backward pressurization inner panel 71 movable distance in described casing is more than the distance of front side steel plate 1 to dextrad pressurization inner panel 72;The described dextrad pressurization inner panel 72 movable distance in described casing is more than left side steel plate 2 to the rear distance to pressurization inner panel 71;Described lower to pressurization the inner panel 76 movable distance in described casing more than upper cover steel plate 6 to dextrad pressurization inner panel 72, after to pressurization inner panel 71 in small distance.
Intensity for guard box body wall, described front side steel plate 1, left side steel plate 2, rear side steel plate 3, right side steel plate 4, go to the bottom steel plate 5, backward pressurization inner panel 71, dextrad pressurization inner panel 72 and lower to pressurization inner panel 76 be square carbon steel plate, described front side steel plate 1, left side steel plate 2, rear side steel plate 3 and the base of right side steel plate 4 are groove seamless welding with the side of steel plate 5 of going to the bottom, the left side of described front side steel plate 1 and the front of left side steel plate 2, the back of left side steel plate 2 and the left side of rear side steel plate 3, the right of rear side steel plate 3 and the back of right side steel plate 4, the front of steel plate 4, right side is groove seamless welding with the right of front side steel plate 1.
When specifically making, first connecting location with screw, use groove seamless welding to be connected together by steel plate the most again, welding can ensure casing accuracy of gauge, and weld firm.Post-weld annealed is to go de-stress, and weld grinding is smooth.
For small indoor confined pressure rock mechanics simulation experiment, a kind of concrete size may is that the length in described casing is 370mm, the wall thickness of described casing, the wall thickness of cover rim 61 are the casing of the thick steel plate seamless welding of 20mm, 20mm and have bigger self-bearing capacity.
A height of 30mm of described cover rim 61, it is provided with three connecting pin bores 11 on described upper cover steel plate 6 every limit cover rim 61, the top margin of corresponding casing is also provided with same three connecting pin bores 11, the connecting pin bores 11 of two correspondences arranges pin, for connecting upper cover steel plate 6 and wall box, to be reached for rock sample offer vertical stress and the effect that casing is sealed.Upper cover steel plate 6 can use the normal carbon steel plate of 430mm × 430mm, and steel plate thickness is 50mm, cuts away 390mm × 390mm highly for the cuboid block of 30mm, formation cover rim 61, in order to seal casing in upper cover steel plate 6 bottom surface central authorities.The cylindrical positioning pins that pin can use specification to be M8 × 20, the head of pin is drilled with the screwed hole of the deep M4 of 20mm, dismantles pin in order to insert bolt.
Described backward pressurization inner panel 71, dextrad pressurization inner panel 72 and lower to pressurization inner panel 76 the length of side be 290mm, thickness is 15mm.Corresponding above-mentioned size, appropriate, screwed hole 10 on described front side steel plate 1, left side steel plate 2 and upper cover steel plate 6 is all 4 × 4 array distribution of 60mm in spacing.Screwed hole 10 array center on described front side steel plate 1 be positioned at front side steel plate 1 right part below and corresponding with the center of backward pressurization inner panel 71, screwed hole 10 array center on described left side steel plate 2 is positioned at the lower rear of left side steel plate 2 and corresponding with the center of dextrad pressurization inner panel 72, and screwed hole 10 array center on described upper cover steel plate 6 is positioned at the right part rear of upper cover steel plate 6 and corresponding with the lower center to the inner panel 76 that pressurizes.The right rear corners that rock sample is urged to when applying stress casing is spacing, it is to avoid displacement;The center of pressurization inner panel is corresponding with the center of screwed hole 10 array, it is to avoid exert a force deflection to rock sample.
Described pre-stressed bolt 12 is outer-hexagonal head full tooth carbon element bolt that specification is M16 × 1.25 × 100mm.Spacing is all had to be 110mm and be positioned at two pilot holes 9 in portion of screwed hole 10 array center on described front side steel plate 1, left side steel plate 2 and upper cover steel plate 6, pilot hole 9 on described front side steel plate 1 and left side steel plate 2 is away from a height of 150mm of casing inner bottom, described pressurization inner panel guide blot 8 is outer-hexagonal head half tooth bolt that specification is M12 × 1.25 × 100mm, and the reach of described pressurization inner panel guide blot 8 is 50mm.
This experimental provision is used specifically to carry out the step of confined pressure experiment as follows:
The first step, pours the rock sample required for experiment according to requirement of experiment, and sample dimensions is mated with the size of described rock confined pressure loading experimental apparatus;
Second step, is placed on a steady and spacious place by rock confined pressure loading experimental apparatus, and the inner panel 72 that backward pressurization inner panel 71 and dextrad pressurizeed is connected in casing by pressurization inner panel guide blot 8 respectively;
3rd step, what rock sample was placed into casing goes to the bottom on steel plate 5, rock sample completely attaches to avoid stress to concentrate with backward pressurization inner panel 71 and dextrad pressurization inner panel 72, by pre-stressed bolt 12, backward pressurization inner panel 71 and dextrad pressurization inner panel 72 are applied a small amount of active force, rock sample is slightly compressed to the right side of casing at the rear corners;
4th step, is connected to lower on upper cover steel plate 6 by pressurization inner panel guide blot 8 to pressurization inner panel 76, and the cover rim 61 of upper cover steel plate 6 is connected anchoring with wall box, notes the direction that cover rim 61 engages with casing;
5th step, all installs the pre-stressed bolt 12 on casing, first by common wrench, pre-stressed bolt 12 is carried out pretension until stud base arrives to the inner panel that pressurizes;
6th step, three identical torque spanners are adjusted to the applying moment converted, locking, synchronize the pre-stressed bolt 12 in three directions on front side steel plate 1, left side steel plate 2, upper cover steel plate 6 to apply moment by amount, first four angle loading stresses to each pressurization inner panel, synchronize the most in three directions to load remaining pre-stressed bolt 12, prevent rock sample unbalance stress, and cause stress to concentrate the situation affecting experimental result;
7th step, owing to general rock sample can produce creep in loading procedure, therefore when after first time confined pressure loaded, generation due to creep, test specimen yet suffers from deformation, the most within a certain period of time, repeats rock sample to load until not having creep to produce.
The center of described upper cover steel plate 6 offers the through hole of an a diameter of 20mm, in order to the layout of pressure break pipe during fracturing, to increase the suitability of this experimental provision so that it is the rock under the conditions of triaxial compression test, simulation true triaxial crustal stress and the gas migration experiment etc. under the conditions of three-dimensional stress of the hydraulic fracturing experiments of coal and rock, coal body can be widely used in.
For preventing casing corrosion, the surface spraying of described casing has rust preventive coating.
The confined pressure loading experimental apparatus of this programme and test method are particularly suited for indoor small confined pressure rock mechanics simulation experiment, not only can be with accurate simulation stress state under the conditions of true three-dimensional crustal stress, and loading equipemtn and the method operation of confined pressure can be simplified, reduce cost.By the simplification loaded is simulated, obtain the architectural characteristic under rock true three-dimension stress.Therefore it is significant at aspects such as raising simulation experiment precision and the scales reducing simulation experiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.

Claims (7)

1. a rock confined pressure loading experimental apparatus, including by front side steel plate (1), left side steel plate (2), rear side steel plate (3), right side steel plate (4), go to the bottom steel plate (5) and casing that upper cover steel plate (6) surrounds, described front side steel plate (1), left side steel plate (2), rear side steel plate (3) and right side steel plate (4) are fixed on steel plate of going to the bottom (5), it is characterized in that: in described front side steel plate (1), each run through on left side steel plate (2) and upper cover steel plate (6) and have several pilot hole (9) and several screwed hole (10) in array distribution, described pilot hole (9) has penetrated pressurization inner panel guide blot (8), described screwed hole (10) is provided with pre-stressed bolt (12);
It is provided with the backward pressurization inner panel (71) parallel with front side steel plate (1) in the inner side of described front side steel plate (1), fixes with the bottom of pressurization inner panel guide blot (8) on front side steel plate (1) before described backward pressurization inner panel (71) and be connected and offset with the bottom of pre-stressed bolt (12) on front side steel plate (1);
Be provided with parallel with left side steel plate (2) dextrad pressurization inner panel (72) in the inner side in described left side steel plate (2), the left side of described dextrad pressurization inner panel (72) is fixing with the bottom of left side steel plate (2) upper pressurization inner panel guide blot (8) to be connected and offsets with the bottom of left side steel plate (2) above pre-stressed bolt (12);
Be provided with parallel with upper cover steel plate (6) lower to pressurization inner panel (76) in the inner side of described upper cover steel plate (6), the bottom of described lower above and the upper cover steel plate (6) to pressurization inner panel (76) upper pressurization inner panel guide blot (8) is fixing to be connected and offsets with the bottom of upper cover steel plate (6) above pre-stressed bolt (12);
The surrounding of described upper cover steel plate (6) is protruding with cover rim (61) down, described cover rim (61) covers in front side steel plate (1), left side steel plate (2), rear side steel plate (3) and the outside of right side steel plate (4), and described cover rim (61) is detachable pin with front side steel plate (1), left side steel plate (2), rear side steel plate (3) and right side steel plate (4) and is connected.
A kind of rock confined pressure loading experimental apparatus the most according to claim 1, it is characterised in that: the described backward pressurization inner panel (71) movable distance in described casing is more than the distance of front side steel plate (1) to dextrad pressurization inner panel (72);Described dextrad pressurization inner panel (72) movable distance in described casing is more than the distance of left side steel plate (2) to backward pressurization inner panel (71);The described lower movable distance to pressurization inner panel (76) in described casing is more than the small distance in upper cover steel plate (6) to dextrad pressurization inner panel (72), backward pressurization inner panel (71).
nullA kind of rock confined pressure loading experimental apparatus the most according to claim 1 and 2,It is characterized in that: described front side steel plate (1)、Left side steel plate (2)、Rear side steel plate (3)、Right side steel plate (4)、Go to the bottom steel plate (5)、Backward pressurization inner panel (71)、Dextrad pressurization inner panel (72) and lower to pressurize inner panel (76) be square carbon steel plate,Described front side steel plate (1)、Left side steel plate (2)、Rear side steel plate (3) and the base of right side steel plate (4) are groove seamless welding with the side of steel plate of going to the bottom (5),The left side of described front side steel plate (1) and the front of left side steel plate (2)、The back in left side steel plate (2) and the left side of rear side steel plate (3)、The right of rear side steel plate (3) and the back of right side steel plate (4)、The front on right side steel plate (4) is groove seamless welding with the right of front side steel plate (1).
A kind of rock confined pressure loading experimental apparatus the most according to claim 3, it is characterized in that: the length in described casing is 370mm, described backward pressurization inner panel (71), dextrad pressurization inner panel (72) and lower to pressurize inner panel (76) the length of side be 290mm, thickness is 15mm, the wall thickness of described casing, the wall thickness of cover rim (61) are 20mm, a height of 30mm of described cover rim (61), described upper cover steel plate (6) is provided with three connecting pin bores (11) on every limit cover rim (61);
Described front side steel plate (1), screwed hole (10) on left side steel plate (2) and upper cover steel plate (6) is all 4 × 4 array distribution of 60mm in spacing, screwed hole (10) array center on described front side steel plate (1) be positioned at front side steel plate (1) right part below and corresponding with the center of backward pressurization inner panel (71), screwed hole (10) array center on described left side steel plate (2) be positioned at left side steel plate (2) lower rear and with dextrad pressurization inner panel (72) center corresponding, screwed hole (10) array center on described upper cover steel plate (6) be positioned at upper cover steel plate (6) right part rear and with lower to pressurization inner panel (76) center corresponding, described pre-stressed bolt (12) be specification be the outer-hexagonal head full tooth carbon element bolt of M16 × 1.25 × 100mm;
Spacing is all had to be 110mm and be positioned at two pilot holes (9) in portion of screwed hole (10) array center on described front side steel plate (1), left side steel plate (2) and upper cover steel plate (6), pilot hole (9) on described front side steel plate (1) and left side steel plate (2) is away from a height of 150mm of casing inner bottom, described pressurization inner panel guide blot (8) be specification be outer-hexagonal head half tooth bolt of M12 × 1.25 × 100mm, the reach of described pressurization inner panel guide blot (8) is 50mm.
5. according to a kind of rock confined pressure loading experimental apparatus according to any one of claim 1 or 2 or 4, it is characterised in that: the center of described upper cover steel plate (6) offers the through hole of an a diameter of 20mm.
6. according to a kind of rock confined pressure loading experimental apparatus according to any one of claim 1 or 2 or 4, it is characterised in that: the surface spraying of described casing has rust preventive coating.
7. the method that the rock confined pressure loading experimental apparatus that a kind utilizes described in any one of claim 1-6 carries out rock confined pressure loading experiment, it is characterised in that the method comprises the steps:
The first step, pours the rock sample required for experiment according to requirement of experiment, and sample dimensions is mated with the size of described rock confined pressure loading experimental apparatus;
Second step, is placed on a steady and spacious place by rock confined pressure loading experimental apparatus, and the inner panel (72) that backward pressurization inner panel (71) and dextrad pressurizeed is connected in casing by pressurization inner panel guide blot (8) respectively;
3rd step, rock sample is placed on the steel plate of going to the bottom (5) of casing, rock sample completely attaches to backward pressurization inner panel (71) and dextrad pressurization inner panel (72), by pre-stressed bolt (12), backward pressurization inner panel (71) and dextrad pressurization inner panel (72) are applied a small amount of active force, rock sample is slightly compressed to the right side of casing at the rear corners;
4th step, is connected to lower on upper cover steel plate (6) by pressurization inner panel guide blot (8) to pressurization inner panel (76), and the cover rim (61) of upper cover steel plate (6) is connected anchoring with wall box;
5th step, all installs the pre-stressed bolt (12) on casing, first by common wrench, pre-stressed bolt (12) is carried out pretension until stud base arrives to the inner panel that pressurizes;
6th step, three identical torque spanners are adjusted to the applying moment converted, locking, synchronize to apply moment by amount to the pre-stressed bolt (12) in front side steel plate (1), left side steel plate (2), upper three directions of upper cover steel plate (6), first four angle loading stresses to each pressurization inner panel, synchronize to load remaining pre-stressed bolt (12) the most in three directions;
7th step, for the first time after confined pressure loaded, repeats rock sample to load until not having creep to produce.
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