CN207650031U - Concrete sample Hydraulic fracturing test sealing device under axial force - Google Patents

Concrete sample Hydraulic fracturing test sealing device under axial force Download PDF

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Publication number
CN207650031U
CN207650031U CN201721590051.XU CN201721590051U CN207650031U CN 207650031 U CN207650031 U CN 207650031U CN 201721590051 U CN201721590051 U CN 201721590051U CN 207650031 U CN207650031 U CN 207650031U
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China
Prior art keywords
concrete sample
cover board
square
axial force
sealing device
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Expired - Fee Related
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CN201721590051.XU
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Chinese (zh)
Inventor
王学志
方俊
张晓飞
王春霞
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Liaoning University of Technology
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Liaoning University of Technology
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Abstract

Concrete sample Hydraulic fracturing test sealing device under a kind of axial force of the utility model offer, including surface cover A on concrete sample, cover board B below, offered on cover board A and B it is several up and down and with along the corresponding screw hole of the pre-buried screw position in specimen thickness direction, the centre positions cover board A cut out the big square steel billet of side ratio incipient crack size and form step slot, placing toughened glass in step slot, cover board A and B are square corner steel tank there are one centre position is fixed, corresponding with the square indentations on concrete sample.Sealing device structure provided by the utility model is simple, it is easy to operate, sealing effect is good, applies the water pressure test by carrying out water filling to the crack set, can obtain the data of hydraulic pressure and axial force that the crack in concrete sample is split under the conditions of axial force and water pressure.

Description

Concrete sample Hydraulic fracturing test sealing device under axial force
Technical field
Concrete sample Hydraulic fracturing test sealing device under a kind of axial force of the utility model offer, it is mixed to be suitable for research The mechanism and rule of hydraulic fracture occur for Xtah Crude Clay structure.
Background technology
Hydraulic fracture is that flow moves and the process of surrounding solid Coupling Deformation, table in the gap of rock mass or concrete It is now that existing crack in rock mass and concrete and gap driving are expanded, extended, be mutually communicated by high pressure water flow.Hydraulic fracture It is that a kind of physical phenomenon for causing crack to occur with extension in rock mass or concrete is raised due to water pressure.
Hydraulic fracture in petroleum gas field most early in occurring, consequently as a technology in industrial gas oil Measure and be widely used.Later, this hydraulic fracture was also gradually applied in geotechnical engineering and waterwork, but same with this When also bring accident to many engineerings, for example the anti-of dykes and dams blends damage, and pressurized water transmission tunnel ruptures leak etc..
In recent years, with the high speed development of hydropower, large reservoir, the construction of high dam are more and more, build with it is proposed Concrete gravity dam have evolved to 300 meter levels, however some cracks all can inevitably occur in these dams, this is just High-pressure hydraulic splitting provides condition.
The mechanism that concrete hydraulic fracture occurs is more complicated, can be embodied in Practical Project, for example, coagulation Influence of the earth dam due to factors such as temperature, construction and concrete shrinkages.Dam body surface is inevitably present crack, the shape in crack Formula is various, such as:Horizontal joint, vertical seam etc..Operating mode residing for crack is also very complicated, such as:It is unstressed to stitch, by tooled joint, tension seam etc.. Due to the limitation of testing equipment and experimental rig, previous scholars are only for the concrete sample incipient crack under the conditions of axially loaded It is studied in the case of not extending through specimen thickness direction, and can not see incipient crack tip position under axle power effect The extension form in crack.
Utility model content
In order to further preferably study concrete sample hydraulic fracture problem, need to design a kind of new hydraulic fracture examination The sealing device tested.
The purpose of this utility model is achieved through the following technical solutions:
Concrete sample Hydraulic fracturing test sealing device under axial force, including concrete sample(1), cover board A, cover board B With the rectangular mould of one side opening(15), the rectangular mould(15)Interior concrete perfusion obtains concrete sample(1);It is mixed Solidifying soil test specimen(1)Top among be tightly connected with cover board A, concrete sample(1)Lower part among at corresponding cover board A and cover board B is tightly connected;Concrete sample(1)It is embedded with several up and down along its thickness direction and threaded screw rod(5), coagulation Native test specimen(1)Several pre-buried bolts of both ends of the surface along its length(6);Concrete sample(1)Upper and lower part among it is corresponding Square indentations are equipped at position(7), it is located at concrete sample(1)The square indentations on top(7)Intermediate position be equipped with just Beginning crack(2), incipient crack(2)Both ends at be equipped with foil gauge(3), incipient crack(2)Middle part and both ends be equipped with folder Formula extensometer(4);The cover board A and concrete sample(1)On screw rod(5)Junction is provided with threaded hole(11), cover board A's There are one square corner steel tanks for centre position setting(12), square corner steel tank(12)With square indentations(7)It cooperates close Envelope connection, square corner steel tank(12)Centre position cut out size be less than square corner steel tank(12)Square steel billet shape At step slot, placing toughened glass in step slot(8), tempered glass(8)It is fixed by screw and step slot, tempering glass Glass(8)Upper corresponding concrete sample(1)Interior incipient crack(2)Position is provided with water inlet tube interface(9)With water outlet interface tube (10);The cover board B and concrete sample(1)On screw rod(5)Junction is provided with threaded hole(11), the interposition of cover board B Square corner steel tank there are one installing(12), square corner steel tank(12)With square indentations(7)It cooperates and is tightly connected.
Further, the concrete sample(1)For rectangular parallelepiped structure, concrete sample(1)It is pre- along its thickness direction It is embedded with the six roots of sensation up and down and threaded screw rod(5), screw rod(5)It is arranged in square indentations(7)Both sides, square indentations (7)Interior smearing epoxide-resin glue.
Further, close to the incipient crack(2)One end in V-shape symmetrically paste 8 10mm long foil gauge (3), close to incipient crack(2)The other end perpendicular to incipient crack(2)Paste the foil gauge of 4 50mm long(3).
Further, the threaded hole reserved on the cover board A, cover board B(11)For rectangle, and four angles of rectangle are It is arc-shaped, apply the direction of axial force along rectangular long side, threaded hole(11)Sectional dimension compare screw rod(5)Sectional dimension It is twice, for when axial deformation is very big, axially force direction to slide.
Further, the square corner steel tank(12)Interior insertion silica gel plate, with concrete sample(1)On square Groove(7)It cooperates, is tightly connected.
The utility model uses above technical scheme, there is following features compared with prior art:
Concrete sample described in the utility model, test specimen use fully graded concrete, and sample dimensions are long 900mm, wide 600mm, thick 200mm, test specimen is along the pre-buried 6 threaded screw rods of thickness direction, and region on test specimen near crack mouthful is with beating Grinding machine polishes flat, for arranging foil gauge, Clip Gauge, test specimen through-thickness and the pre-buried band of the axial force direction of application The screw rod of screw thread is several.
Cover board A and B described in the utility model is steel plate, and plate size is the square of 450mm, thick 10mm.Steel plate A Be respectively drilled with 6 threaded holes on B, and corresponded with the threaded screw position of concrete sample through-thickness is embedded in, It is in close contact by nut and cover board.The position that tempered glass on cover board A corresponds to preset slot is provided with 2 threaded holes, is respectively Water inlet tube interface and water outlet interface tube.
Various test data measuring instrument described in the utility model includes 12 foil gauges, is arranged in preset slot both ends. The both ends and middle part of preset slot arrange that three Clip Gauges are used for measuring the sealing and the sharp shift value of seam of preset slot altogether.One Load transducer and a displacement sensor are respectively used for measuring the shift value of the load and generation that apply axial force.It tested Measurement data in journey can be acquired and be preserved in real time on host.
Compared with prior art, the utility model has the advantages of for:
(1)Improving previous device cannot observe that incipient crack is made in axial force and water pressure joint by seal cover board The deficiency of expansion process under.And use the device can be by the expansion of the observation of the tempered glass on seal cover board incipient crack Open up situation.
(2)Incipient crack on test specimen is through its thickness direction, is prefabricated straight joint, this is different from existing axis and draws examination Part form, existing axis draw test specimen to be all made of single-side prefabrication crackle, and crackle does not penetrate through, although this can to avoid the infiltration of water, But but also interface where entire crackle, which cannot achieve real total cross-section, bears water pressure, and what the utility model used penetrates Crack sample type makes entire crack surface that can be acted on by uniform water pressure, realize real crack surface all by To effect of water pressure.Meanwhile sample type used in the utility model can reduce the thickness of concrete sample to a certain extent It spends and then reduces its volume, so that test specimen makes and studies more convenient.
(3)The threaded hole on seal cover board on test specimen is twice than screw sections size, in this way can be in axial deformation Axially the direction of power can be slided when prodigious, can reduce cover board to a certain extent to screw rod on axle power direction Influence of the friction of generation to test result.
(4)The mode that previous device applies axial force in the horizontal direction is improved, since test specimen weight is significantly less than in the past Similar test specimen, therefore the present apparatus, other than the mode for applying axial force in the horizontal direction may be used, it is vertical to realize Direction applies axial force mode.Since experimental provision and test specimen sheet are as axial symmetry device, use vertical direction experiment can be with Eliminate wobbler action caused by the gravity of test specimen.
(5)Axis pressure, the Water hydraulic static pressure loading system of experiment are mutual indepedent, can according to the specific requirement of experiment, freely adjust and Control, and test the data such as strain, displacement, load in the process and automatic collection and preservation can be achieved.
Description of the drawings
Fig. 1 is the overall structure diagram of the utility model.
Fig. 2 is the vertical view of the concrete sample of the utility model.
Fig. 3 is the vertical view of the utility model cover plate A.
Fig. 4 is the vertical view of the utility model cover plate B.
Fig. 5 is the structural schematic diagram of the utility model test piece mould.
Fig. 6 is the inlet and outlet schematic diagram on the utility model tempered glass.
Wherein:1, concrete sample, 2, incipient crack, 3, foil gauge, 4, Clip Gauge, 5, screw rod, 6, bolt, 7, just Square groove, 8, tempered glass, 9, water inlet tube interface, 10, water outlet interface tube, 11, threaded hole, 12, square corner steel tank, 13, Preset slot steel disc, 14, square punch-pin, 15, rectangular mould.
Specific implementation mode
The technical solution of the utility model is described in detail with reference to relevant drawings and specific embodiment.
Embodiment
As shown in Fig. 1 to Fig. 6, concrete sample Hydraulic fracturing test sealing device under a kind of axial force, including open on one side Mouthful rectangular mould 15, centre position is inlaid with square punch-pin 14 on maximum two faces of 15 inner area of rectangular mould, in Heart position is embedded with preset slot steel disc 13, cover board A and B.Concrete perfusion obtains concrete sample 1 and just in rectangular mould 15 Square groove 7.Concrete sample 1 is embedded with the six roots of sensation up and down and threaded screw rod 5 along its thickness direction, concrete sample Last pre-buried four bolts 6 of 1 both ends of the surface, the upper same position cover board A, B are respectively opened there are six spiral shell corresponding with 5 position of screw rod There are water inlet tube interface 9 in pit 11,2 position of incipient crack for corresponding to concrete sample 1 on the middle part tempered glass 8 of the cover board A With water outlet interface tube 10, the square corner steel tank 12 longer than 8 length of side of tempered glass is fixed on described cover board A, B, by just It is inserted into silica gel plate in rectangular angle steel slot 12 and smears epoxy resin in square indentations 7 on concrete sample 1 and forms sealing Device.In order to arrange foil gauge 3 and Clip Gauge 4, to polish flat around the incipient crack 2, water proof insulating cement is used in combination Filling polishes.
As shown in Figure 1, the seal cover board A and B of the utility model is fixed with concrete sample 1 by threaded screw rod 5 Connection.The sealing device of the utility model forms square corner steel tank 12 by the way that angle steel is fixed on the centre positions cover board A, B, just It is inserted into silica gel plate in rectangular angle steel slot 12, suitable epoxy resin is smeared in the square indentations 7 on concrete sample 1, then Cover board A, B are covered.Being sealing adhesive between silica gel plate and epoxy resin squeezes work by fixed formed of screw rod 5 and nut With.
As shown in Fig. 2, the foil gauge 3 of the utility model is arranged in the both ends of incipient crack 2, side is perpendicular to initially splitting It stitches 2 directions and arranges 4, the other side is arranged to V-shaped perpendicular to 2 direction of incipient crack and pastes 8, amounts to 12.
As shown in figure 3, steel plate is cut out a tempered glass 8 greatly by the position for putting tempered glass 8 on the utility model cover board A Small bloom makes step slot, and tempered glass 8 is placed in slot, is fixed itself and cover board A by screw.
A kind of implementation of concrete sample Hydraulic fracturing test includes the rectangular mould 15 of one side opening, in length The pre-buried preset slot steel disc 13 for forming incipient crack 2 in the maximum two faces centre position of 15 area of section of cube mold, and in length A square punch-pin 14 is inlayed in the maximum two inner face centre positions of 15 area of section of cube mold, in rectangular mould 15 Concrete perfusion obtains concrete sample 1 and square indentations 7.Concrete sample 1 is surrounded along specimen thickness direction initially to be split 2 equidistant pre-buried 6 threaded screw rods 5 are stitched, 1 both ends of the surface of concrete sample distinguish pre-buried 4 threaded bolts 6.Initially It to polish flat around crack 2, be disposed to measure the Clip Gauge 4 and foil gauge 3 of 2 end displacement value of incipient crack, It is used in combination the filling of water proof insulating cement to polish.
A kind of sealing device of concrete sample Hydraulic fracturing test, including the cover board A above concrete sample 1, below Cover board B, cover board A and cover board B on offer it is several up and down and with along the pre-buried spiral shell of 1 thickness direction of concrete sample The corresponding screw hole 11 in 5 position of bar, the centre positions cover board A cut out the big square steel billet of 2 size of side ratio incipient crack and are formed Step slot, placing toughened glass 8 in step slot, tempered glass 8 can be screwed on step slot;In tempering 2 position of incipient crack on concrete sample 1 is corresponded on glass 8 reserves a water inlet tube interface 9 and a water outlet interface tube 10;Lid Plate A and the centre positions cover board B are respectively and fixedly provided with a square corner steel tank 12, with 14 shape of square punch-pin on concrete sample 1 At square indentations 7 it is corresponding, and square corner steel tank 12 envelope surfaces product is bigger than 8 area of tempered glass;In square indentations 7 Certain epoxide-resin glue is smeared, is inserted into the preferable silica gel plate of ductility in square corner steel tank 12, then be inserted into and be coated with epoxy In the square indentations 7 of resin glue, finally the threaded screw rod 5 of lid surface is fixed by nut and cover board A and cover board B It is good, in order to ensure that cover board A, cover board B are consistent to pressure caused by concrete sample 1, each screw rod 5 on cover board A, cover board B The stubborn number of turns of nut is consistent;1 both ends of the surface of concrete sample can be inserted in the rectangle steel plate of thick 70mm, steel plate and concrete 1 both ends of test specimen are fixed by pre-buried screw rod bolt 6, by applying axial force to steel plate when load.
The development of the utility model mainly includes the following steps that:
(1)Test material preparation:Concrete is manufactured using the rectangular mould 15 that inside dimension is 900mm × 600mm × 200mm Test specimen 1, and two faces centre position of 15 inside 900mm × 600mm of rectangular mould respectively inlay a size be 300mm × The square punch-pin 14 of 300mm.Before concrete sample 1 pours, on the faces 900mm × 600mm first on rectangular mould 15 Fixed preset slot steel disc 13 is used for prefabricated incipient crack 2, and the size of preset slot steel disc 13 is 300mm × 130mm × 4mm, and pre- It is 300mm to stay and stitch steel disc 13 along 1 thickness direction of concrete sample, therefore the length of the incipient crack 2 formed is concrete sample 1 Thickness, as 200mm, the width for forming incipient crack 2 are 130mm, and the thickness of incipient crack 2 is 4mm, according to the need of experiment It wants, it can be with the incipient crack 2 of prefabricated different inclination angle.Trepanning sets up pre- on the face of 900mm × 600mm of rectangular mould 15 Bury screw rod 5.By six roots of sensation diameter 12mm, long 350mm, threaded screw rod 5 inserts in the hole, rectangular mould 15 600mm × Trepanning sets up pre-embedded bolt 6 on the face of 200mm, and by eight diameter 25mm, the threaded bolt of long 300mm 6 is inserted into rectangular respectively In the hole at 15 both ends of mould, it is used for the application of both ends axial force.Last casting concrete test specimen 1.
(2)Measuring instrument is arranged:The application that axial force and water pressure are realized by hydraulic pump, by combining axial force sensor The control of axial force and water pressure is realized with high-precision pressure gauge and direct-acting overflow valve, 2 both ends of incipient crack, which need to paste, answers Become piece 3 and Clip Gauge 4 needs to polish flat around incipient crack 2 in order to which sticking effect is more preferable.In incipient crack 2 Both ends and centre position are arranged with Clip Gauge 4, incipient crack 2 both ends paste foil gauge 3, one end perpendicular to Fracture length direction arranges 4, and the length of the foil gauge 3 is 50mm, width 3mm;Other end is arranged to long about crack Symmetrical V-shaped is spent, 4 foil gauges are respectively arranged on both sides, and it is 3mm that the length of the foil gauge, which is 10mm width,;In addition, connection is answered Become piece 3, the conducting wire of Clip Gauge 4 is drawn, and is smeared and is filled with epoxide-resin glue, make it at the trial and can play water proof with absolutely The effect of edge.Then cover board A, B are fixed by screw rod 5.In order to ensure that cover board A, B are consistent to pressure caused by test specimen, cover The stubborn number of turns of the nut of the upper each screw rod of plate A, B 5 is consistent.1 both ends of the surface of concrete sample can be inserted in the rectangular bar of steel of thick 70mm Plate, steel plate and 1 both ends of concrete sample are fixed by pre-buried screw rod bolt 6, by applying axis to rectangle steel plate when load Xiang Li.When experiment, the water inlet pipe mouth 9 first passed through on cover board A fills water in incipient crack 2, in order to by air in sealing device Discharge, effluent pipe mouth 10 are opened when starting the water filling in incipient crack 2, are full of water rear enclosed when incipient crack 2 is interior.Finally lead to Cross the hydraulic fracture process that concrete sample 1 is completed in hydraulic press pressurization.
(3)In terms of data acquisition:The strain that axial force can be generated axial force by load transducer during experiment Amount is converted into voltage signal and is output to data collecting instrument to obtain axial force;The strain of 3 surveyed fracture tip of foil gauge can With by dynamic strain system acquisition, dynamic strain system is existing dynamic strain indicator;4 surveyed incipient crack of Clip Gauge 2 slit width in expansion process and the sharp shift value of seam can be collected and anti-by the low speed signal acquisition system being connected on computer It reflects on curve in a coordinate system, then result is obtained by analyzing.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and Retouching also should be regarded as the scope of protection of the utility model.

Claims (5)

1. concrete sample Hydraulic fracturing test sealing device under axial force, which is characterized in that including concrete sample(1), lid The rectangular mould of plate A, cover board B and one side opening(15), the rectangular mould(15)Interior concrete perfusion obtains concrete Test specimen(1);Concrete sample(1)Top among be tightly connected with cover board A, concrete sample(1)Lower part among corresponding lid It is tightly connected with cover board B at plate A;Concrete sample(1)It is up and down and threaded it to be embedded with several along its thickness direction Screw rod(5), concrete sample(1)Several pre-buried bolts of both ends of the surface along its length(6);Concrete sample(1)It is upper, Corresponding position is equipped with square indentations among lower part(7), it is located at concrete sample(1)The square indentations on top(7)In Between position be equipped with incipient crack(2), incipient crack(2)Both ends at be equipped with foil gauge(3), incipient crack(2)Middle part and two End is equipped with Clip Gauge(4);The cover board A and concrete sample(1)On screw rod(5)Junction is provided with threaded hole (11), there are one square corner steel tanks for the centre position setting of cover board A(12), square corner steel tank(12)With square indentations (7)It cooperates and is tightly connected, square corner steel tank(12)Centre position cut out size be less than square corner steel tank(12)'s Square steel billet forms step slot, placing toughened glass in step slot(8), tempered glass(8)Pass through screw and step Shape slot is fixed, tempered glass(8)Upper corresponding concrete sample(1)Interior incipient crack(2)Position is provided with water inlet tube interface(9) With water outlet interface tube(10);The cover board B and concrete sample(1)On screw rod(5)Junction is provided with threaded hole(11), lid There are one square corner steel tanks for the centre position setting of plate B(12), square corner steel tank(12)With square indentations(7)Phase interworking It closes and is tightly connected.
2. concrete sample Hydraulic fracturing test sealing device under axial force according to claim 1, which is characterized in that institute The concrete sample stated(1)For rectangular parallelepiped structure, concrete sample(1)It is embedded with the six roots of sensation up and down and band along its thickness direction The screw rod of screw thread(5), screw rod(5)It is arranged in square indentations(7)Both sides, square indentations(7)Interior smearing epoxide-resin glue.
3. concrete sample Hydraulic fracturing test sealing device under axial force according to claim 1, which is characterized in that Close to the incipient crack(2)One end in V-shape symmetrically paste 8 10mm long foil gauge(3), close to incipient crack(2) The other end perpendicular to incipient crack(2)Paste the foil gauge of 4 50mm long(3).
4. concrete sample Hydraulic fracturing test sealing device under axial force according to claim 1, which is characterized in that institute The threaded hole reserved on cover board A, the cover board B stated(11)For rectangle, and four angles of rectangle are arc-shaped, apply axial force Direction is along rectangular long side, threaded hole(11)Sectional dimension compare screw rod(5)Sectional dimension is twice, in axial change Axially force direction slides when shape is very big.
5. concrete sample Hydraulic fracturing test sealing device under axial force according to claim 1, which is characterized in that institute The square corner steel tank stated(12)Interior insertion silica gel plate, with concrete sample(1)On square indentations(7)It cooperates, it is close Envelope connection.
CN201721590051.XU 2017-11-24 2017-11-24 Concrete sample Hydraulic fracturing test sealing device under axial force Expired - Fee Related CN207650031U (en)

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Application Number Priority Date Filing Date Title
CN201721590051.XU CN207650031U (en) 2017-11-24 2017-11-24 Concrete sample Hydraulic fracturing test sealing device under axial force

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Application Number Priority Date Filing Date Title
CN201721590051.XU CN207650031U (en) 2017-11-24 2017-11-24 Concrete sample Hydraulic fracturing test sealing device under axial force

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107796706A (en) * 2017-11-24 2018-03-13 辽宁工业大学 Concrete sample Hydraulic fracturing test sealing device and implementation under axial force
CN109752249A (en) * 2019-01-22 2019-05-14 北京交通大学 The sealing device and encapsulating method of sample and slip casting pedestal in three axis muddy water diametral compression tests
CN114577614A (en) * 2022-01-27 2022-06-03 长安大学 Hydraulic fracture experimental device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107796706A (en) * 2017-11-24 2018-03-13 辽宁工业大学 Concrete sample Hydraulic fracturing test sealing device and implementation under axial force
CN109752249A (en) * 2019-01-22 2019-05-14 北京交通大学 The sealing device and encapsulating method of sample and slip casting pedestal in three axis muddy water diametral compression tests
CN109752249B (en) * 2019-01-22 2024-02-27 北京交通大学 Sealing device and sealing method for sample and grouting base in triaxial mud water splitting test
CN114577614A (en) * 2022-01-27 2022-06-03 长安大学 Hydraulic fracture experimental device
CN114577614B (en) * 2022-01-27 2023-12-08 长安大学 Hydraulic fracturing experimental device

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