CN104165797A - Pile-soil interface three-axis model testing device under condition of seepage - Google Patents
Pile-soil interface three-axis model testing device under condition of seepage Download PDFInfo
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- CN104165797A CN104165797A CN201410438668.4A CN201410438668A CN104165797A CN 104165797 A CN104165797 A CN 104165797A CN 201410438668 A CN201410438668 A CN 201410438668A CN 104165797 A CN104165797 A CN 104165797A
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- pile
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Abstract
The invention discloses a pile-soil interface three-axis model testing device under a condition of seepage. The pile-soil interface three-axis model testing device comprises a three-axis confining pressure chamber, a vertical loading and unloading platform, a confining pressure control system, a seepage control system and a data acquisition system, wherein a pile-soil sample is arranged in the three-axis confining pressure chamber and has an interface between a pile body and a soil body; the vertical loading and unloading platform is used for loading tangential stress to the interface; the confining pressure control system is used for loading normal stress to the interface; the seepage control system is used for controlling seepage parameters in the pile-soil sample; and the data acquisition system is used for acquiring deformation data of the pile-soil sample in the three-axis apparatus confining pressure chamber. The pile-soil interface three-axis model testing device under the condition of seepage is capable of more conveniently studying stress characteristics of the pile-soil interface of the soil body under the action of coupling the seepage and the complex stresses.
Description
Technical field
The present invention relates to the three shaft model test apparatuses in a kind of soil test technique field, specifically a lower soil contact face three shaft model testing equipments of a kind of seepage flow condition.
Background technology
Excavation of foundation pit precipitation can cause the mechanical characteristic of cheating end stake to be affected, research soil body stake soil contact face interaction mechanism under the coupling of seepage flow and complex stress variation contributes to deep understanding and performance and the security situation of assessing hole end stake, and can instruct Practical Project.
In the method that solves problem aspect this, mainly contain modelling, monitoring method and laboratory experiment method at present.Modelling need to be set up seepage through soil mass field and stress field model, and parameter is many, and workload is large, and needs shop experiment to carry out necessary checking to it just can to use.Monitoring method high cost is uneconomical, and shop experiment can relatively accurately be reacted again the impact of seepage flow on stake Soil Interface characteristic intuitively, and simple to operate, cost is low again.To prior art literature search, not yet find a lower soil contact face three shaft model testing equipments of research seepage flow condition.
Summary of the invention
The present invention seeks to: for the problems referred to above, propose a lower soil contact face three shaft model testing equipments of a kind of seepage flow condition, to allow people can study more easily the stake soil contact face mechanical characteristic of the soil body under seepage flow and complex stress coupling.
Technical scheme of the present invention is: a lower soil contact face three shaft model testing equipments of described seepage flow condition comprise:
In it, be furnished with three axle confined pressure chambers of a soil sample, described stake soil sample has the surface of contact of pile body and the soil body,
What described surface of contact shearing stress was loaded vertically adds unloading plat,
The confined pressure control system that described surface of contact normal stress is loaded,
Control the seepage flow control system of the inner seepage parameters of stake soil sample,
And the data acquisition system (DAS) that gathers the deformation data of described triaxial apparatus confined pressure chamber king-pile soil sample.
The present invention, on the basis of technique scheme, also comprises following optimal technical scheme:
Described three axle confined pressure chambers comprise confined pressure chamber base, confined pressure chamber upper cover, organic glass cylinder, confined pressure chamber pull bar, displacement transducer fixed mount, confined pressure air admission hole, upper osculum, lower osculum, vent port and two cover piston, described stake soil sample is arranged on the base of confined pressure chamber, two cover pistons respectively stake top and the Tu Ding of corresponding stake soil sample are settled, and two cover pistons with vertically add unloading plat and be connected, confined pressure air admission hole is connected with confined pressure control system, and upper osculum is connected with seepage flow control system with lower osculum.
Described vertically add that unloading plat comprises two cover piston reaction frames and with the uniaxial tension machine of variator, described two cover piston reaction frames are connected with two cover pistons, uniaxial tension machine is lifted three axle confined pressure chambers more than being arranged in below the base of confined pressure chamber.
Described confined pressure control system comprises air compressor and the tracheae that this air compressor is communicated with confined pressure air admission hole gas phase on described three axle confined pressure chambers, and precise pressure regulating valve and precision pressure gauge are installed on described tracheae.
Described seepage flow control system comprises constant pressure hydraulic opertaing device and the tracheae that this constant pressure hydraulic opertaing device is communicated with upper osculum on described three axle confined pressure chambers and lower osculum liquid phase.
Described data acquisition system (DAS) comprises soil movement sensor, the native relative displacement meter of stake, stake pressure on top surface sensor and native pressure on top surface sensor, wherein soil movement installation of sensors is on the displacement transducer fixed mount of described three axle confined pressure chambers, the native relative displacement meter of stake is located between described two cover piston reaction frame and confined pressure chamber upper cover, and stake pressure on top surface sensor and native pressure on top surface sensor are arranged in respectively on corresponding two cover piston reaction frames.
Described stake soil sample consists of soil sample, Model Pile latex film, upper dankness stone, lower permeable stone, filter paper and upper cap.
Described soil movement sensor comprises displacement transducer body, radio transmitting box, wireless receiver and computing machine, described displacement transducer body has in insertion soil sample, for surveying the contact pin of soil layer deformation, described radio transmitting box is connected to accept the soil layer deformation information that displacement transducer body is surveyed with displacement transducer body signal, described wireless receiver receives the soil layer deformation information in radio transmitting box by the mode of wireless transmission, and the soil layer being received distortion is transferred to computing machine, by the acquisition software on computing machine, this information is shown.
Advantage of the present invention is: (1) this equipment can complete the soil body interactional triaxial test of stake soil contact face under complex stress path, shop experiment favorable repeatability; (2) this equipment can be considered the effect of precipitation seepage flow, more meets engineering reality.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be described further:
Fig. 1 is the structure diagram of the embodiment of the present invention;
Embodiment
Fig. 1 shows a specific embodiment of a lower soil contact face three shaft model testing equipments of this seepage flow condition of the present invention, and this equipment comprises:
In it, be furnished with three axle confined pressure chambers of a soil sample 1, described stake soil sample 1 has the surface of contact of pile body and the soil body,
What described surface of contact shearing stress was loaded vertically adds unloading plat (shearing stress refers to the stress along surface of contact direction),
The confined pressure control system shearing stress (normal stress refers to the stress perpendicular to surface of contact direction) that described surface of contact normal stress is loaded,
Control the seepage flow control system of stake soil sample 1 inner seepage parameters,
And the data acquisition system (DAS) that gathers the deformation data of described triaxial apparatus confined pressure chamber king-pile soil sample 1.
In the present embodiment, the concrete structure of described three axle confined pressure chambers is as follows: it comprises confined pressure chamber base 2, confined pressure chamber upper cover 3, organic glass cylinder 4, confined pressure chamber pull bar 5, displacement transducer fixed mount 6, confined pressure air admission hole 7, upper osculum 8, lower osculum 9, vent port 10 and two cover piston 11.Described stake soil sample 1 is arranged on confined pressure chamber base 2, and two cover pistons 11 respectively stake top and the Tu Ding of corresponding stake soil samples 1 are settled, and two cover piston 11 with vertically add unloading plat and be connected, for suitable surface of contact to stress loading.Confined pressure air admission hole 7 is connected with confined pressure control system, for surface of contact normal stress, loads.Upper osculum 8 is connected with seepage flow control system with lower osculum 9, for controlling the inner seepage parameters of a soil sample 1.
Described vertically add that unloading plat comprises two cover piston reaction frames 12 and with the uniaxial tension machine 13 of variator.Wherein, two cover piston reaction frames 12 are connected with two cover pistons 11, for providing the stake top of a soil sample 1 and the counter-force of Tu Ding to realize the loading to stress along surface of contact.Uniaxial tension machine 13 is arranged in below confined pressure chamber base 2, on lift three axle confined pressure chambers.
Described confined pressure control system comprises air compressor 15 and the tracheae 14 that this air compressor is communicated with confined pressure air admission hole 7 gas phases on described three axle confined pressure chambers, and precise pressure regulating valve 16 and precision pressure gauge 17 are installed on described tracheae 14, with time by adjustment precision pressure regulator valve 16, realize the loading of surface of contact normal stress.In this example, this tracheae 14 is high strength tracheae.
In this example, the air pressure of air compressor 15 adopts 0.6MPa, can tune up as required air pressure maximal value.The measurement range of precision pressure gauge 17 is 0～1MPa, and measuring accuracy is 0.005MPa, needs zeroing before use.
Described seepage flow control system comprises constant pressure hydraulic opertaing device 29 and the tracheae 14 that this constant pressure hydraulic opertaing device is communicated with upper osculum 8 on described three axle confined pressure chambers and the equal liquid phase of lower osculum 9.By conditioning equipment 29, control a soil sample 1 internal holes swaging and become seepage flow.
Described data acquisition system (DAS) comprises soil movement sensor, the native relative displacement meter 18 of stake, stake pressure on top surface sensor and native pressure on top surface sensor 19.Wherein, soil movement sensor is wireless senser, and it is arranged on the displacement transducer fixed mount 6 of described three axle confined pressure chambers.The native relative displacement meter 18 of stake is located between described two cover piston reaction frame 12 and confined pressure chamber upper cover 3.Stake pressure on top surface sensor and native pressure on top surface sensor 19 are arranged in respectively on corresponding two cover piston reaction frames 12.
Described stake soil sample 1 consists of soil layer 20, Model Pile 21, latex film 22, lower permeable stone 23a, upper dankness stone 23b, filter paper 24 and upper cap 25.
Described soil movement sensor comprises displacement transducer body 30, radio transmitting box 27, wireless receiver and computing machine 28.Wherein, displacement transducer body 30 has the contact pin 26 inserting in soil layer 20, for surveying soil layer deformation.Radio transmitting box 27 is connected to accept the soil layer deformation information that displacement transducer body 30 detects with displacement transducer body 30 signals.Wireless receiver receives the soil layer deformation information in radio transmitting box by the mode of wireless transmission, and the soil layer being received distortion is transferred to computing machine 28, by the acquisition software on computing machine, this information is shown.Described displacement transducer body 30 ranges are 10mm, and precision is 0.01mm.
In conjunction with shown in Fig. 1, now the using method of this three shaft model testing equipments of the present embodiment is described below, the method mainly comprises following step again:
(1) make stake soil sample 1, stake soil sample 1 is made in splitting round mould, in the circular hole first Model Pile 21 being inserted in base 2 center disk of confined pressure chamber, latex film 22 is enclosed within the center disk of confined pressure chamber base 2, outside latex film 22, put preparation of soil sample mould, then 22 li of latex films from the bottom to top according to lower permeable stone 23a, filter paper 24, soil sample 20, filter paper 24, upper dankness stone 23b and on the order of cap 25 place, latex film 22 upper and lower sides are tightened with preventing water leakage gas leakage with bungee, and the stake soil sample of making is put on confined pressure chamber base 2.
(2) stake soil sample 1 is bled, when the interior formation negative pressure of stake soil sample 1 guarantees to remove stake soil sample 1 making mould, stake soil sample 1 can not cave in.The mould of then dismantling outside a soil sample 1.
(3) displacement transducer body 30 is demarcated, after completing, be placed on displacement transducer fixed mount 6, and the contact pin on soil movement sensor 26 is inserted in stake soil sample 1, after contact pin 26 inserts in stake soil sample 1, can wear out latex film 22, in the place of wearing out latex film 22, carry out encapsulation process, in case the gas leakage of leak-stopping water.After displacement transducer body 30 installs, the data output end of soil movement sensor is connected on wireless data transmission box 27.
(4) on confined pressure chamber base 2, put organic glass cylinder 4, then put confined pressure chamber upper cover 3, with confined pressure chamber pull bar 5, three axle confined pressure chambers are fixing tight, to prevent three axle confined pressure chamber gas leakage.Then a whole set of three axle confined pressure chambers are placed in vertically and are added on unloading plat.
(5) with tracheae 14, air compressor 15 is communicated with the confined pressure air admission hole 7 of confined pressure chamber, and on this tracheae 14, precise pressure regulating valve 16 and precision pressure gauge 17 is set.Then precision pressure gauge 17 is returned to zero, after open precise pressure regulating valve 16, by suitable confined pressure, to keep a stake soil sample not cave in, now close and remove vacuum pump.
(6) osculum up and down of confined pressure chamber 8,9 is connected to respectively to constant pressure hydraulic opertaing device 29, adopts back-pressure method to carry out saturated to stake soil sample 1.By constant pressure hydraulic opertaing device 29, at upper and lower osculum 8,9 places, load the seepage flow of the native soil sample 1 of the existing stake of different hole compactings.
(7) stake soil sample 1 saturated after, open the data acquisition software in computing machine 28, carry out the collection of primary data and instrument debugged.
(8) according to testing requirements adjustment precision pressure regulator valve 16, load confined pressure to stake soil sample 1.
(9) start 13 pairs of confined pressure chambers of uniaxial tension machine and lift on carrying out, the counter-forces of utilizing two cover piston reaction frames 12 to produce, by two cover pistons 11 give stake top and native jacking row along surface of contact to add off-load.
(10) open a pressure on top surface sensor and native pressure on top surface sensor 19 and stake a native relative displacement meter 18 carry out the collection of data.
Certainly, above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow people can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformation or modification that according to the present invention, the Spirit Essence of main technical schemes is done, within all should being encompassed in protection scope of the present invention.
Claims (8)
1. a lower soil contact face three shaft model testing equipments of seepage flow condition, is characterized in that this equipment comprises:
In it, be furnished with three axle confined pressure chambers of a soil sample (1), described stake soil sample (1) has the surface of contact of pile body and the soil body,
What described surface of contact shearing stress was loaded vertically adds unloading plat,
The confined pressure control system that described surface of contact normal stress is loaded,
Control the seepage flow control system of the inner seepage parameters of stake soil sample (1),
And the data acquisition system (DAS) that gathers the deformation data of described triaxial apparatus confined pressure chamber king-pile soil sample (1).
2. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 1, it is characterized in that: described three axle confined pressure chambers comprise confined pressure chamber base (2), confined pressure chamber upper cover (3), organic glass cylinder (4), confined pressure chamber pull bar (5), displacement transducer fixed mount (6), confined pressure air admission hole (7), upper osculum (8), lower osculum (9), vent port (10) and two cover piston (11), described stake soil sample (1) is arranged on confined pressure chamber base (2), two cover pistons (11) respectively stake top and the Tu Ding of corresponding stake soil sample (1) are settled, and two cover pistons (11) with vertically add unloading plat and be connected, confined pressure air admission hole (7) is connected with confined pressure control system, upper osculum (8) is connected with seepage flow control system with lower osculum (9).
3. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 2, it is characterized in that: described vertically add that unloading plat comprises two cover piston reaction frames (12) and with the uniaxial tension machine (13) of variator, described two cover piston reaction frames (12) are connected with two cover pistons (11), and uniaxial tension machine (13) is arranged in confined pressure chamber base (2) the above three axle confined pressure chambers of lifting below.
4. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 3, it is characterized in that: described confined pressure control system comprises air compressor (15) and the tracheae (14) that this air compressor is communicated with confined pressure air admission hole (7) gas phase on described three axle confined pressure chambers, and precise pressure regulating valve (16) and precision pressure gauge (17) are installed on described tracheae (14).
5. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 4, is characterized in that: described seepage flow control system comprises constant pressure hydraulic opertaing device (29) and the tracheae (14) that this constant pressure hydraulic opertaing device is communicated with upper osculum (8) on described three axle confined pressure chambers and lower osculum (9) liquid phase.
6. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 5, it is characterized in that: described data acquisition system (DAS) comprises soil movement sensor, stake native relative displacement meter (18), stake pressure on top surface sensor and native pressure on top surface sensor (19), wherein soil movement installation of sensors is on the displacement transducer fixed mount (6) of described three axle confined pressure chambers, the native relative displacement meter of stake (18) is located between described two cover piston reaction frame (12) and confined pressure chamber upper cover (3), stake pressure on top surface sensor and native pressure on top surface sensor (19) are arranged in respectively on corresponding two cover piston reaction frames (12).
7. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 1, is characterized in that: described stake soil sample (1) consists of soil sample (20), Model Pile (21), latex film (22), lower permeable stone (23a), upper dankness stone (23b), filter paper (24) and upper cap (25).
8. a lower soil contact face three shaft model testing equipments of seepage flow condition according to claim 1, it is characterized in that: described soil movement sensor comprises displacement transducer body (30), radio transmitting box (27), wireless receiver and computing machine (28), described displacement transducer body (30) has in insertion soil sample (20), for surveying the contact pin (26) of soil layer deformation, described radio transmitting box (27) is connected to accept the soil layer deformation information that displacement transducer body (30) is surveyed with displacement transducer body (30) signal, described wireless receiver receives the soil layer deformation information in radio transmitting box by the mode of wireless transmission, and the soil layer being received distortion is transferred to computing machine (28), by the acquisition software on computing machine, this information is shown.
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| CN201410438668.4A CN104165797B (en) | 2014-08-29 | 2014-08-29 | The shaft model testing equipment of pile-soil interface three under the conditions of seepage flow |
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| CN110426295A (en) * | 2019-07-11 | 2019-11-08 | 水利部交通运输部国家能源局南京水利科学研究院 | Contact surface shears three axis test devices and method |
| CN113933181A (en) * | 2021-09-03 | 2022-01-14 | 中南大学 | Shield foam improved muck triaxial shear test device and method |
| CN114324113A (en) * | 2021-12-30 | 2022-04-12 | 福州大学 | Test device and method for measuring permeability coefficient and permeability path of soil-structure interface |
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| CN109540690A (en) * | 2018-11-13 | 2019-03-29 | 河海大学 | A kind of pile-soil interface mechanical property testing device based on temperature control triaxial apparatus |
| CN110426295A (en) * | 2019-07-11 | 2019-11-08 | 水利部交通运输部国家能源局南京水利科学研究院 | Contact surface shears three axis test devices and method |
| CN113933181A (en) * | 2021-09-03 | 2022-01-14 | 中南大学 | Shield foam improved muck triaxial shear test device and method |
| CN114324113A (en) * | 2021-12-30 | 2022-04-12 | 福州大学 | Test device and method for measuring permeability coefficient and permeability path of soil-structure interface |
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