CN102495194A - Backpressure-applied consolidation test device with constant strain rate and test method of backpressure-applied consolidation test device - Google Patents
Backpressure-applied consolidation test device with constant strain rate and test method of backpressure-applied consolidation test device Download PDFInfo
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- CN102495194A CN102495194A CN2011103591599A CN201110359159A CN102495194A CN 102495194 A CN102495194 A CN 102495194A CN 2011103591599 A CN2011103591599 A CN 2011103591599A CN 201110359159 A CN201110359159 A CN 201110359159A CN 102495194 A CN102495194 A CN 102495194A
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Abstract
The invention discloses a backpressure-applied consolidation test device with a constant strain rate and a test method of the backpressure-applied consolidation test device. The test device comprises an axial load control device for keeping the constant strain rate constant, a backpressure control device for applying a backpressure to a test sample to ensure saturation of a test sample, a consolidation device and a data measurement and collection device, wherein one end of the consolidation device is connected with the axial load control device, the other end of the consolidation device is connected with the backpressure control device, and the consolidation device is used for solidifying the test sample and providing a backpressure environment; and the data measurement and collection device comprises a plurality of sensors and a data collector connected with the sensors, wherein each sensor is connected with the consolidation device, and measured analogue signals of displacement and pressure in each element in the consolidation device are transmitted to the data collector and recorded. In comparison with a common CRS (Constant Rate of strain) consolidation test device, the backpressure-applied consolidation test device with the constant strain rate and the test method of the backpressure-applied consolidation test device, provided by the invention, can achieve the functions of increasing the backpressure of a soil body and automatically collecting the data, and carry out a saturated test sample CRS consolidation test.
Description
Technical field
The invention belongs to earthwork engineering shop experiment technical field, relate to a kind of constant strain rate consolidation test device, relate in particular to a kind of constant strain rate consolidation test device that applies back pressure; Simultaneously, the invention still further relates to the test method of above-mentioned constant strain rate consolidation test device.
Background technology
The compressibility of soil is meant that soil under action of compressive stress compression deformation takes place, and volume is compressed the performance that diminishes.The consolidation test purpose is to measure distortion and pressure, void ratio and pressure, distortion and the time relation of natural soil body sample under lateral confinement and axial drainage condition.Can obtain relevant compressibility indexs such as native compressibility coefficient, modulus in compression, compression index, the coefficient of consolidation, preconsolidation pressure through consolidation test, as the foundation of engineering design calculating.
Constant strain rate (CRS) consolidation test is to carry out continuous consolidation test through controlling strain speed, can accomplish within a short period of time fixedly, is particularly suitable for saturated cohesive soil and makes an experiment.But because non-disturbed sample in sampling and sample preparation stage water evaporates and loss can take place, make soil sample unsaturated, cause general CRS consolidation test result inaccurate.
As, Chinese patent CN200710061958.1 discloses a kind of indoor quick loaded concretion experiment apparatus and method thereof, belongs to the field tests of the deformation characteristic index of geotechnical engineering investigation and all kinds of structure foundations.This equipment by the vertical load bringing device, hold the test soil sample consolidation container, liquid-pressure pick-up and deformation-sensor, static resistance strainmeter, PC computing machine form; Test procedure of the present invention is: 1. sampling, and for use after saturated through bleeding; 2. will test the soil sample consolidation container of packing into, the sample bottom is sealed and is connected with sensor; 3. consolidation container is placed in the vertical load bringing device, and liquid-pressure pick-up and deformation-sensor is installed, carry out pore water pressure and vertical deformation test in the relevant position; 4. utilize static resistance strainmeter and PC computing machine to carry out stationary singnal collection, transmission and record.This patent is transformed on the basis of routine consolidation test instrument, has adopted similar vertical load pressue device and automation data to measure and harvester.Can make sample rapidly solidified, have the advantage that shortens test period and data recording robotization with the constant strain rate.Yet such scheme exists do not mention how solving the saturated problem of sample.
Summary of the invention
Technical matters to be solved by this invention is: a kind of constant strain rate consolidation test device that applies back pressure is provided, increases the function of soil body back pressure and automatic data collection, can carry out saturated sample CRS consolidation test.。
In addition, the present invention also provides the test method of above-mentioned constant strain rate consolidation test device, increases the function of soil body back pressure and automatic data collection, can carry out saturated sample CRS consolidation test.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of constant strain rate consolidation test device that applies back pressure, said test unit comprises:
The xial feed control device is in order to constant fixed rate of strain;
The back pressure control device in order to sample is applied back pressure, guarantees that sample is saturated;
Consolidation device, one of which end connect said xial feed control device, and the other end connects the back pressure control device, in order to fixed sample with the back pressure environment is provided;
DATA REASONING and harvester comprise some sensors, the data collecting instrument that is connected with sensor, and each sensor connects said consolidation device, and displacement, the pressure simulation signal of element in the consolidation device that records is sent to data collecting instrument, and record.
As a kind of preferred version of the present invention, said consolidation device comprises pressure rod, consolidometer lid, base, saturator permeable stone, bottom discharge pipeline and pressure chamber; Said pressure rod top links to each other with the xial feed control device, the bottom is opened screw thread mouth and is connected the consolidometer lid, is used to transmit upper pressure; The said consolidometer portion of covering is connected with pressure rod through screw thread, is used for fixing and is connected sample, and the bottom increases annular draining striped and permeable stone makes things convenient for draining; Said base bottom contacts with the chassis, pressure chamber through three chassis preformed grooves, and top links to each other with the saturator permeable stone through saturator permeable stone preformed groove, and other has the cutting ring preformed groove to be used to place sample; Said bottom discharge pipeline links to each other with saturator permeable stone preformed groove water hole that the bottom begins to rehearse, and is used to measure the sample pore water pressure and changes; Said pressure chamber links to each other with the back pressure control device, is used for sample is applied back pressure.
Further, said DATA REASONING and harvester specifically comprise: meter, data collecting instrument and computing machine are pressed in pressure transducer, displacement meter, hole; Said pressure transducer input end is connected with pressure rod, gaging pressure, and output terminal links to each other with data collecting instrument; Said displacement meter is arranged in the pressure chamber, measures soil body axial deformation, and output terminal links to each other with data collecting instrument; Said hole presses meter to link to each other with the bottom discharge pipeline, measures pore water pressure, and output terminal links to each other with data collecting instrument; Said data collecting instrument end links to each other with computing machine.
Further, said consolidation device further comprises the proving ring that is arranged at the pressure rod place, and this proving ring is connected with said pressure transducer.
As a kind of preferred version of the present invention, said pressure transducer is a strain pressure transducer, and working range is 0～1.0MPa.The strain-type displacement transducer is counted in said displacement, and its working range is: 0mm～30mm.Said hole is pressed and is counted strain pressure transducer, and its working range is: 0MPa～1.0MPa.
A kind of above-mentioned test method that applies the constant strain rate consolidation test device of back pressure, said test method comprises the steps:
Step S1: prepare sample according to size, debugging xial feed control device, back pressure control device;
Step S2: the assembling consolidation device, with the sample consolidation device of packing into,, put into the pressure chamber then at sample outer setting rubber die;
Step S3: meter to suitable original state, tune-up data Acquisition Instrument are pressed in adjustment pressure transducer, displacement meter and hole;
Step S4: open the bottom discharge mouth, apply vertical load and back pressure load through xial feed control device, back pressure control device, the measurement result of meter is pressed in pressure transducer, displacement meter and hole in the record consolidation process;
Step S5: in computing machine, the data of data Acquisition Instrument stored are carried out handled, obtain required result.
Beneficial effect of the present invention is: the constant strain rate consolidation test device and the test method thereof of the applied back pressure that the present invention proposes; Than general CRS consolidation test device; Realize increasing the function of soil body back pressure and automatic data collection, can carry out saturated sample CRS consolidation test.
Description of drawings
Fig. 1 is the structural representation of constant strain rate consolidation test device of the present invention.
Fig. 2 is the structural representation of consolidation device.
Fig. 3 is the sectional view of stainless steel base.
Embodiment
Specify the preferred embodiments of the present invention below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 1, the present invention has disclosed a kind of constant strain rate consolidation test device that applies back pressure, and said test unit comprises: xial feed control device 1, back pressure control device 2, CRS consolidation device 3 and DATA REASONING and harvester 4.
Wherein, xial feed control device 1 is in order to constant fixed rate of strain; Back pressure control device 2 guarantees that in order to sample is applied back pressure sample is saturated.One end of consolidation device 3 connects said xial feed control device 1, and the other end connects back pressure control device 2, in order to fixed sample with the back pressure environment is provided.DATA REASONING comprises some sensors, the data collecting instrument that is connected with sensor with harvester 4, and each sensor connects said consolidation device, and displacement, the pressure simulation signal of element in the consolidation device that records is sent to data collecting instrument, and record.
Said xial feed control device 1 and back pressure control device 2 are continued to use the equipment of former normal triaxial appearance.Xial feed control device 1 guarantees that sample is fixed with the constant strain rate; 2 pairs of samples of back pressure control device apply back pressure, guarantee that sample is saturated.
See also Fig. 2, Fig. 3, described CRS consolidation device 3 comprises stainless steel pressure rod 5, consolidometer lid 6, stainless steel base 7, saturator permeable stone 8, bottom discharge pipeline 9 and pressure chamber 10.Wherein: stainless steel pressure rod 5 tops link to each other with xial feed control device 1, the bottom is opened screw thread mouth and is connected consolidometer lid 6, are used to transmit upper pressure; Consolidometer covers 6 tops and is connected with stainless steel pressure rod 5 through screw thread, is used for fixing and is connected sample, and the bottom increases annular draining striped and permeable stone makes things convenient for draining; Stainless steel base 7 bottoms contact with the chassis, pressure chamber through three chassis preformed grooves 73, and top links to each other with saturator permeable stone 8 through saturator permeable stone preformed groove 72, and other has cutting ring preformed groove 71 to be used to place sample; Bottom discharge pipeline 9 links to each other with saturator permeable stone 8 preformed groove water holes that the bottom begins to rehearse 75, is used to measure the sample pore water pressure and changes; Pressure chamber 10 links to each other with back pressure control device 2, is used for sample is applied back pressure.Stainless steel base 7 external X-overs have screw thread mouth 74 in advance.
Described DATA REASONING and harvester 4 comprise pressure transducer 11, displacement meter 12, hole pressure meter 13, data collecting instrument 14 and computing machine 15.Wherein: pressure transducer 11 inputs link to each other with xial feed control device 1, and output terminal links to each other with data collecting instrument 14; Displacement meter 12 is arranged in the pressure chamber 10, measures soil body axial deformation, and output terminal links to each other with data collecting instrument 14; The hole presses meter 13 to link to each other with bottom discharge pipeline 9, measures soil body hole and presses variation, and output terminal links to each other with data collecting instrument 14; Data collecting instrument 14 output terminals link to each other with computing machine 15.In the present embodiment, said pressure transducer 11 is a strain pressure transducer, and working range is 0～1.0MPa; Said displacement meter 12 is the strain-type displacement transducer, and its working range is: 0mm～30mm; It is strain pressure transducer that meter 13 is pressed in said hole, and its working range is: 0MPa～1.0MPa.
A kind of above-mentioned test method that applies the constant strain rate consolidation test device of back pressure, said test method comprises the steps:
Step S1: prepare sample according to size, debugging xial feed control device, back pressure control device;
Step S2: the assembling consolidation device, with the sample consolidation device of packing into,, put into the pressure chamber then at sample outer setting rubber die;
Step S3: meter to suitable original state, tune-up data Acquisition Instrument are pressed in adjustment pressure transducer, displacement meter and hole;
Step S4: open the bottom discharge mouth, apply vertical load and back pressure load through xial feed control device, back pressure control device, the measurement result of meter is pressed in pressure transducer, displacement meter and hole in the record consolidation process;
Step S5: in computing machine, the data of data Acquisition Instrument stored are carried out handled, obtain required result.
In sum; The constant strain rate consolidation test device and the test method thereof of the applied back pressure that the present invention proposes; Than general CRS consolidation test device, realized increasing the function of soil body back pressure and automatic data collection, can carry out saturated sample CRS consolidation test.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change here to the embodiment that is disclosed.
Claims (8)
1. constant strain rate consolidation test device that can apply back pressure is characterized in that said test unit comprises:
The xial feed control device is in order to constant fixed rate of strain;
The back pressure control device in order to sample is applied back pressure, guarantees that sample is saturated;
Consolidation device, one of which end connect said xial feed control device, and the other end connects the back pressure control device, in order to fixed sample with the back pressure environment is provided;
DATA REASONING and harvester comprise some sensors, the data collecting instrument that is connected with sensor, and each sensor connects said consolidation device, and displacement, the pressure simulation signal of element in the consolidation device that records is sent to data collecting instrument, and record.
2. the constant strain rate consolidation test device that applies back pressure according to claim 1 is characterized in that:
Said consolidation device comprises pressure rod, consolidometer lid, base, saturator permeable stone, bottom discharge pipeline and pressure chamber;
Said pressure rod top links to each other with the xial feed control device, the bottom is opened screw thread mouth and is connected the consolidometer lid, is used to transmit upper pressure;
The said consolidometer portion of covering is connected with pressure rod through screw thread, is used for fixing and is connected sample, and the bottom increases annular draining striped and permeable stone makes things convenient for draining;
Said base bottom contacts with the chassis, pressure chamber through three chassis preformed grooves, and top links to each other with the saturator permeable stone through saturator permeable stone preformed groove, and other has the cutting ring preformed groove to be used to place sample;
Said bottom discharge pipeline links to each other with saturator permeable stone preformed groove water hole that the bottom begins to rehearse, and is used to measure the sample pore water pressure and changes;
Said pressure chamber links to each other with the back pressure control device, is used for sample is applied back pressure.
3. the constant strain rate consolidation test device that applies back pressure according to claim 2 is characterized in that:
Said DATA REASONING and harvester specifically comprise: meter, data collecting instrument and computing machine are pressed in pressure transducer, displacement meter, hole;
Said pressure transducer input end is connected with pressure rod, gaging pressure, and output terminal links to each other with data collecting instrument;
Said displacement meter is arranged in the pressure chamber, measures soil body axial deformation, and output terminal links to each other with data collecting instrument;
Said hole presses meter to link to each other with the bottom discharge pipeline, measures pore water pressure, and output terminal links to each other with data collecting instrument;
Said data collecting instrument end links to each other with computing machine.
4. the constant strain rate consolidation test device that applies back pressure according to claim 3 is characterized in that:
Said consolidation device further comprises the proving ring that is arranged at the pressure rod place, and this proving ring is connected with said pressure transducer.
5. the constant strain rate consolidation test device that applies back pressure according to claim 1 is characterized in that:
Said pressure transducer is a strain pressure transducer, and working range is 0～1.0MPa.
6. the constant strain rate consolidation test device that applies back pressure according to claim 1 is characterized in that:
The strain-type displacement transducer is counted in said displacement, and its working range is: 0mm～30mm.
7. the constant strain rate consolidation test device that applies back pressure according to claim 1 is characterized in that:
Said hole is pressed and is counted strain pressure transducer, and its working range is: 0MPa～1.0MPa.
8. the said test method that applies the constant strain rate consolidation test device of back pressure of one of claim 1 to 7 is characterized in that said test method comprises the steps:
Step S1: prepare sample according to size, debugging xial feed control device, back pressure control device;
Step S2: the assembling consolidation device, with the sample consolidation device of packing into,, put into the pressure chamber then at sample outer setting rubber die;
Step S3: meter to suitable original state, tune-up data Acquisition Instrument are pressed in adjustment pressure transducer, displacement meter and hole;
Step S4: open the bottom discharge mouth, apply vertical load and back pressure load through xial feed control device, back pressure control device, the measurement result of meter is pressed in pressure transducer, displacement meter and hole in the record consolidation process;
Step S5: in computing machine, the data of data Acquisition Instrument stored are carried out handled, obtain required result.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854130B (en) * | 2012-08-23 | 2015-05-13 | 铁道第三勘察设计院集团有限公司 | Combined type loading assembly for rock lateral confined expansion test |
| CN105137032A (en) * | 2015-07-28 | 2015-12-09 | 同济大学 | Temperature and humidity control constant-strain rate high-pressure consolidation apparatus |
| CN106525580A (en) * | 2016-09-09 | 2017-03-22 | 上海交通大学 | Three-axis test volume change monitoring apparatus based on differential pressure sensor |
| CN106950348A (en) * | 2017-03-16 | 2017-07-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Geotechnical centrifugal model test hydraulic pressure consolidation device and method |
| CN107422097A (en) * | 2017-05-23 | 2017-12-01 | 北京交通大学 | A kind of device for measuring soil solidifying performance and expansive force |
| CN107607387A (en) * | 2017-09-15 | 2018-01-19 | 中航勘察设计研究院有限公司 | A kind of continuous loading consolidation apparatus of strain controlling for being used to test soil body compressible index |
| CN113552162A (en) * | 2021-07-15 | 2021-10-26 | 大连理工大学 | CRS temperature control consolidation system and method based on nuclear magnetic scanning |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854130B (en) * | 2012-08-23 | 2015-05-13 | 铁道第三勘察设计院集团有限公司 | Combined type loading assembly for rock lateral confined expansion test |
| CN105137032A (en) * | 2015-07-28 | 2015-12-09 | 同济大学 | Temperature and humidity control constant-strain rate high-pressure consolidation apparatus |
| CN106525580A (en) * | 2016-09-09 | 2017-03-22 | 上海交通大学 | Three-axis test volume change monitoring apparatus based on differential pressure sensor |
| CN106950348A (en) * | 2017-03-16 | 2017-07-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Geotechnical centrifugal model test hydraulic pressure consolidation device and method |
| CN106950348B (en) * | 2017-03-16 | 2023-07-21 | 水利部交通运输部国家能源局南京水利科学研究院 | Hydraulic consolidation device and method for geotechnical centrifugal model test |
| CN107422097A (en) * | 2017-05-23 | 2017-12-01 | 北京交通大学 | A kind of device for measuring soil solidifying performance and expansive force |
| CN107422097B (en) * | 2017-05-23 | 2023-09-12 | 北京交通大学 | Device for measuring soil consolidation performance and expansion force |
| CN107607387A (en) * | 2017-09-15 | 2018-01-19 | 中航勘察设计研究院有限公司 | A kind of continuous loading consolidation apparatus of strain controlling for being used to test soil body compressible index |
| CN113552162A (en) * | 2021-07-15 | 2021-10-26 | 大连理工大学 | CRS temperature control consolidation system and method based on nuclear magnetic scanning |
| CN113552162B (en) * | 2021-07-15 | 2023-01-06 | 大连理工大学 | CRS temperature control consolidation system and method based on nuclear magnetic scanning |
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Application publication date: 20120613 |