CN104297030A - Device and method applied to preparation of samples for simulating natural formation process of frozen soil - Google Patents
Device and method applied to preparation of samples for simulating natural formation process of frozen soil Download PDFInfo
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- CN104297030A CN104297030A CN201410544992.4A CN201410544992A CN104297030A CN 104297030 A CN104297030 A CN 104297030A CN 201410544992 A CN201410544992 A CN 201410544992A CN 104297030 A CN104297030 A CN 104297030A
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Abstract
The invention discloses a device applied to preparation of samples for simulating natural formation process of frozen soil. The device comprises a temperature control system, a sample preparing system, a compaction system and a computer control system, wherein the temperature control system comprises a heat preservation box, a cold bath device and a circular refrigeration pipeline; the circular refrigeration pipeline comprises a cooling liquid conveying pipeline, a spiral refrigeration pipeline and a cooling liquid recycling pipeline which are sequentially communicated with one another; the sample preparing system comprises a sample preparing chamber and a sample preparing mold; the spiral refrigeration pipeline spirally surrounds around the peripheral surface of the sample preparing chamber; the compaction system comprises a loading bracket and a pressing head; the loading and compacting rate and the progress depth of the pressing head are controlled by the computer control system. The invention also provides a sample preparing method which is especially suitable for preparing frozen soil samples with different freezing rates and different freezing and compacting sequences in a normal-temperature laboratory by the sample preparing device; real and reliable samples are provided for test of study on influence caused by the freezing rates and compacting and freezing sequences on the mechanical strength characteristics of the soil.
Description
Technical field
The present invention relates to a kind of sample preparation device and the method for making sample that are applicable to simulate frozen soil self-assembling formation process, specifically relate to freezing rate by preparing sample and select the sequencing that freezes operate with this two kinds of sample preparations of compacting as required, thus simulate the sample preparation device of frozen soil forming process under multiple natural operating mode and different method for making sample.
Background technology
Along with strategy to develop western regions continue carry out, the frozen ground regions even infrastructure construction of Permafrost Area are constantly carried out, in order to ensure security and the economy of this area's engineering, be necessary to further investigate the frozen soil mechanics strength characteristics under multiple natural operating mode.Triaxial compression test and unconfined compression strength test have in frozen soil mechanics Quality Research to be applied very widely.When carrying out these two kinds tests, making cylindrical sample is the first step, and the quality of obtained sample directly decides the correctness of test findings, and different method for making sample also will obtain different test findings.
In cyopedology in the past and Artificial Frozen Soil mechanical property test MT specification, the triaxial compressions of frozen soil and the method for making of unconfined compressive strength sample be normally: the normal temperature sample first under obtained certain water percentage condition, then the constant temperature oven quick-frozen 4-6 hour lower than-30 DEG C is put into together with sampling die, finally by sample in required test temperature bottom knockout, and with repairing the finishing of native cutter, load in polybag and seal, under test temperature, maintenance is stand-by.In this sample making course, the cylindrical soil sample of soil first under compacting becomes normal temperature state of certain water percentage, then sample is reduced to-30 DEG C from normal temperature, and the moisture in soil sample completes and freezes, and forms the frozen sample required for test.
But, the Seasonal Freeze-thaw Soils of Frozen Ground Area is actually temperature is slowly changed to subzero temperature through the several months process and inverse process thereof by positive temperature, the freeze thawing that freeze thawing round the clock and weather cataclysm cause is then temperature is changed to rapidly subzero temperature through short period process and inverse process thereof by positive temperature, therefore studies freezing rate and has certain theory significance and construction value to the impact that frozen soil engineering is stable.
In addition, the frozen soil generation type of different regions also has difference, and the frozen soil in some area is met microthermal climate by normal temperature soil again through natural settling consolidation and freezed to form, and the method for making sample that in this and specification, the first compacting of defined is freezed again is similar; But the frozen soil in some area be by fluffy soil naturally after freezing again manual compaction is formed, or filled after excavating by frozen soil again and formed, this frozen soil is more common in extremely frigid zones reclamation work; In addition, in some Practical Project, the process of filling of soil is just along with the reduction of temperature.And native freezes the formation that will affect ice with the sequencing of compacting, also affects cementing form and the degree of consolidation of ice particle and soil particle, finally certainly will affect the mechanical property of frozen soil.Therefore, in the process preparing sample, consider that sample freezes will to have very large realistic meaning with the sequencing of compacting.
At present, consult the pertinent literature of frozen soil aspect, about freezing rate and freeze with compacting sequencing that there is not been reported on the impact of frozen soil mechanics character, about considering that also someone mentions for the sample preparation device of these two kinds of factors and method for making sample.Therefore, research and development one can consider this two kinds of factors, thus the sample preparation device of frozen soil forming process and method for making sample under simulating different natural operating mode, to carrying out in a deep going way, the research of frozen soil mechanics character is significant.
Summary of the invention
Fundamental purpose of the present invention is, overcome prior art preparation facilities and sample institute Consideration exists deviation and the deficiency failing to prepare the aspects such as the sample more meeting frozen soil forming process under different natural operating mode for preparing, a kind of sample preparation device and method for making sample of simulating frozen soil self-assembling formation process are provided, be specially adapted to utilize this device to obtain different freezing rate in normal temperature laboratory and difference freezes the frozen soil sample with compacting sequencing, the frozen soil under being formed to make research sample and natural conditions more meets.
In order to achieve the above object, the technical solution adopted in the present invention is:
Simulate a sample preparation device for frozen soil self-assembling formation process, comprise temperature control system, sample-preparing system, debulking systems and computer control system.
Wherein, described temperature control system comprises insulation can, cryostat device and circularly cooling pipeline, and described insulation can is connected with cryostat device by circularly cooling pipeline; Described circularly cooling pipeline comprises conveying coolant duct through successively, spiral refrigeration piping and reclaims coolant duct; Described conveying coolant duct and recovery coolant duct are distributed between insulation can and cryostat device; Described spiral refrigeration piping is positioned at insulation can inside; Described conveying coolant duct is provided with flow controller.
Meanwhile, described sample-preparing system comprises sample preparation chamber and sampling die, and described sample preparation chamber erect type is arranged on insulation can inside, and the upper end open of sample preparation chamber is positioned at insulation can upper surface; Described sampling die can matched be installed in sample preparation chamber cavity volume; The bottom surface of described sample preparation chamber is detachable is provided with bloom, is provided with the temperature sensor that connecting line is electrically connected with computer control system in described bloom; Described spiral refrigeration piping is looped around on sample preparation chamber outer peripheral face in the shape of a spiral.
Further, described debulking systems comprises loading frame and pressure head; Described loading frame is detachable to be arranged on insulation can upper surface; Described pressure head to be connected with loading frame by depression bar and to be distributed in directly over sample preparation chamber upper end open, and can vertically be pressed in the sampling die in sample preparation chamber cavity volume set by insulation can inside; Loading compaction velocity and the process degree of depth of described pressure head control by computer control system.
Sample preparation device of the present invention is set to further: described debulking systems also comprises heat-insulating shield and stop; Described heat-insulating shield to be located at bottom pressure head and identical with pressure head bottom size; The sole piece that described loading frame comprises vertical door frame, contacts with insulation can upper surface; Described sole piece is distributed in the limit, two ends of insulation can upper surface respectively; Described loading frame is done along insulation can upper surface by the roller be provided with bottom its sole piece to move around; Described stop is located on insulation can upper surface, for carrying out spacing to the track that moves around of loading frame.
Sample preparation device of the present invention is further set to: be provided with lifting jack bottom described sample preparation chamber bloom, and described lifting jack is used for ejecting completing the sampling die after sample preparation together with made sample; The thermal insulation board identical with bloom bottom size is provided with between lifting jack top bottom described bloom; Described bloom and thermal insulation board can one-body molded after be arranged on lifting jack top.
Sample preparation device of the present invention is further set to: described sample preparation chamber is cylindrical, and described sampling die is cylindrical three-part pattern; The internal diameter of described cylindrical sample preparation chamber is identical with the external diameter of three-part pattern; The height of described sample preparation chamber and three-part pattern is 2 times of the specimen height of required system.
Sample preparation device of the present invention is further set to: described insulation can inside is filled with the insulation material of isocyanurate foam.
Present invention also offers a kind of method for making sample of simulating frozen soil self-assembling formation process, comprise the steps:
(1) sample preparation device of the simulation frozen soil self-assembling formation process prepared needed for sample, is assembled;
(2), by the loading frame be arranged in above sample preparation device insulation can and pressure head remove directly over sample preparation chamber upper end open, make the upper end open of sample preparation chamber be in unobstructed state;
(3), bottom the columniform cavity volume of sample preparation chamber layer overlay filter paper, then be installed in sample preparation chamber cavity volume after the inside surface of sampling die three-part pattern is evenly coated with last layer silicone oil;
(4), pour into in sampling die three-part pattern by mixing the fluffy soil sample of mixing in advance;
(5), retract loading frame and pressure head, pressure head is distributed in directly over sample preparation chamber upper end open and is in the original state loading compacting operation; Then control the loading compaction velocity of pressure head by computer control system and the process degree of depth makes pressure head cover three-part pattern upper port, now pressure head is in accurate pressure condition, and the heat-insulating shield simultaneously bottom pressure head can be incubated sample preparation chamber;
(6), prepare the frozen soil sample of different self-assembling formation process as required and take different samplings and sample preparation order to be prepared, described sampling comprises that sample is temperature required, freezing rate, and described sample preparation order comprises the sequencing freezing to operate with this two kinds of sample preparations of compacting;
(7), after the sample of simulation frozen soil self-assembling formation process prepares, pressure head is pulled out from compaction state and removes directly over sample preparation chamber upper end open together with loading frame;
(8), by preparation have the sampling die three-part pattern of sample to take out from the cavity volume of sample preparation chamber together with made sample, made sample is taken out from sampling die three-part pattern, then put into constant temperature oven carry out constant temperature maintenance after stand-by.
Further, the sample preparation order of described step (6) is freezed for first compacting again, or first freezes compacting again, or freezes while compacting.
Further, sample preparation operation of freezing in described step (6) comprises, regulate by the flow controller on conveying coolant duct the coolant rate size being conveyed into spiral refrigeration piping from cryostat device, and then lower the temperature to the soil sample in sampling die three-part pattern; Understand soil sample temperature by the temperature sensor be connected with computer control system, when the temperature stabilization measured is when sample is temperature required, namely think that cooling terminates, complete and freeze, the average freezing rate of sample can be calculated simultaneously.
Further, compacting sample preparation operation in described step (6) comprises, loading compaction velocity and the process degree of depth of pressure head is controlled by computer control system, make original fluffy soil sample in sampling die three-part pattern be compacted to the pre-set specimen height of computer control system at leisure under the pressure effect of pressure head, thus complete compacting.
Further: preparation has the sampling die three-part pattern of sample to eject from sample preparation chamber cavity volume together with made sample by the lifting jack be arranged on bottom sample preparation chamber by described step (8); Put into constant temperature oven after being separated from three-part pattern by made sample again to carry out constant temperature and maintain 48 hours.
Compared with prior art, the present invention a kind of simulate frozen soil self-assembling formation process sample preparation device and the beneficial effect that has of method for making sample have:
1, the circularly cooling pipeline be connected with cryostat device comprises conveying coolant duct through successively, spiral refrigeration piping and reclaims coolant duct, described spiral refrigeration piping is looped around on sample preparation chamber outer peripheral face in the shape of a spiral, can ensure to be in soil sample in the sampling die three-part pattern in sample preparation chamber cavity volume is preparing in specimen, each position of the upper, middle and lower of soil sample all can uniform decrease in temperature, fast cooling, efficiency of thus lowering the temperature is high, source of consuming energy few.
2, by arranging flow controller on conveying coolant duct, realizing regulating cryostat device to be conveyed into the object of coolant rate size in spiral refrigeration piping, thus reaching the controlled demand that can adopt different rate of temperature fall to different sample preparation soil sample; By arranging the temperature sensor be electrically connected with computer control system in the bloom of sample preparation chamber bottom surface, understanding the soil sample temperature in preparation process in time, when the temperature stabilization measured is when sample is temperature required, namely thinking that cooling terminates; And the average freezing rate of sample can be calculated according to temperature fall time, be conducive to that quantification is realized to freeze operation and control.
3, debulking systems and temperature control system are separate, are prepared different frozen soil samples by taking different samplings and sample preparation order; First compacting specifically can be adopted to freeze or first freeze compacting more again or freeze, while the different sample preparation order such as compacting, to simulate the forming process of frozen soil under different natural operating mode, thus prepare the true and reliable sample meeting different research institute and need.
4, realize by computer control system the automated control operation preparing sample, reach data reaction accurately, fast, executable operations in order, reliable, many objects such as sample making course is smooth and easy, controlled, and guarantee that sample is successfully prepared, meet standard.
5, the present invention also have simple for structure, easy to install, solid and reliable, cost of manufacture is low, utilization factor advantages of higher, under a sample preparation device can simulate the natural operating mode of multiple difference, frozen soil forming process is to complete the preparation of various sample, can significantly reduce the cost payout preparing sample in laboratory.
Foregoing is only the general introduction of technical solution of the present invention, and in order to clearer understanding technological means of the present invention, below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of simulating the sample preparation device of frozen soil self-assembling formation process of the present invention;
Fig. 2 is a kind of cross-sectional view simulating the insulation can of the sample preparation device of frozen soil self-assembling formation process of the present invention;
Fig. 3 is a kind of structural representation of simulating the sampling die of the sample preparation device of frozen soil self-assembling formation process of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, Figure 2 and Figure 3, a kind of sample preparation device of simulating frozen soil self-assembling formation process, comprises temperature control system, sample-preparing system, debulking systems and computer control system.
Wherein, described temperature control system comprises insulation can 1, cryostat device 2 and circularly cooling pipeline, and described insulation can 1 is connected with cryostat device 2 by circularly cooling pipeline, and described insulation can 1 inside is filled with the insulation material of isocyanurate foam; Described circularly cooling pipeline comprises conveying coolant duct 21 through successively, spiral refrigeration piping 22 and reclaims coolant duct 23; Described conveying coolant duct 21 and recovery coolant duct 23 are distributed between insulation can 1 and cryostat device 2; It is inner that described spiral refrigeration piping 22 is positioned at insulation can 1; Described conveying coolant duct 21 is provided with flow controller 24.
Described sample-preparing system comprises sample preparation chamber 3 and sampling die 4, and described sample preparation chamber 3 is cylindrical, and described sampling die 4 is cylindrical three-part pattern; The internal diameter of described cylindrical sample preparation chamber 3 is identical with the external diameter of three-part pattern; The height of described sample preparation chamber 3 and three-part pattern is 2 times of the specimen height of required system.It is inner that described sample preparation chamber 3 erect type is arranged on insulation can 1, and the upper end open of sample preparation chamber 3 is positioned at insulation can 1 upper surface; Described sampling die 4 can matched be installed in sample preparation chamber 3 cavity volume; The bottom surface of described sample preparation chamber 3 is detachable is provided with bloom 31, is provided with the temperature sensor 32 that connecting line 50 is connected with computer control system 5 in described bloom 31; Described spiral refrigeration piping 22 is looped around on sample preparation chamber 3 outer peripheral face in the shape of a spiral; Be provided with lifting jack 33 bottom described sample preparation chamber bloom 31, described lifting jack 33 is for ejecting completing the sampling die after sample preparation 4 together with made sample; The thermal insulation board 34 identical with bloom 31 bottom size is provided with between lifting jack 33 top bottom described bloom 31; Described bloom 31 and thermal insulation board 34 can one-body molded after be arranged on lifting jack 33 top.
Described debulking systems comprises loading frame 6 and pressure head 7; Described loading frame 6 is detachable to be arranged on insulation can 1 upper surface; Described pressure head 7 to be connected with loading frame 6 by depression bar 70 and to be distributed in directly over sample preparation chamber 3 upper end open, and can vertically be pressed in the sampling die 4 in inner set sample preparation chamber 3 cavity volume of insulation can 1; Loading compaction velocity and the process degree of depth of described pressure head 7 control by computer control system 5.Described debulking systems also comprises heat-insulating shield 71 and stop 72; Described heat-insulating shield 71 to be located at bottom pressure head 7 and identical with pressure head 7 bottom size; The sole piece 62 that described loading frame 6 comprises vertical door frame 61, contacts with insulation can 1 upper surface; Described sole piece 62 is distributed in the limit, two ends of insulation can 1 upper surface respectively; Described loading frame 6 is done along insulation can 1 upper surface by the roller 63 be provided with bottom its sole piece 62 to move around; Described stop 72 is located on insulation can 1 upper surface, and quantity is four, for carrying out spacing to the track that moves around of loading frame 6.
Sample preparation device according to Fig. 1, Fig. 2 and Fig. 3 can prepare the frozen soil sample of different self-assembling formation process, the step of concrete method for making sample is: first loading frame 6 is slid onto side, insulation can 1 upper surface by the roller 63 bottom sole piece 62, make the upper end open of sample preparation chamber 3 be in unobstructed state, stop 72 now can prevent loading frame 6 slippage from excessively turning over; Layer overlay filter paper bottom the columniform cavity volume of sample preparation chamber 3 again, is installed in sample preparation chamber 3 cavity volume after the inside surface of sampling die three-part pattern is evenly coated with last layer silicone oil; Then pour into in sampling die three-part pattern by mixing the fluffy soil sample of mixing in advance; Then retract loading frame 6 and pressure head 7, pressure head 7 is distributed in directly over sample preparation chamber 3 upper end open and is in the original state loading compacting operation; Controlled loading compaction velocity and the process degree of depth of pressure head 7 afterwards by computer control system 5, make pressure head 7 cover the upper port of sampling die 4, now pressure head 7 is in accurate pressure condition, and the heat-insulating shield 71 simultaneously bottom pressure head 7 can be incubated sample preparation chamber 3.
Prepare the frozen soil sample of different self-assembling formation process more as required and take different samplings and sample preparation order to be prepared, described sampling comprises that sample is temperature required, freezing rate, and described sample preparation order comprises the sequencing freezing to operate with this two kinds of sample preparations of compacting; Then, after waiting for that the sample of simulation frozen soil self-assembling formation process prepares, pressure head 7 is pulled out from compaction state and removes directly over sample preparation chamber 3 upper end open together with loading frame 6; Finally the sampling die 4 of sample there is is to eject from sample preparation chamber 3 cavity volume together with made sample preparation by the lifting jack 33 be arranged on bottom sample preparation chamber 3; Made sample is departed from three-part pattern, then puts into constant temperature oven and carry out constant temperature and maintain after 48 hours stand-by.
The sample preparation order that the frozen soil sample preparing different self-assembling formation process as required can be taked has first compacting to freeze again, or first freezes compacting again, or freezes while the order such as compacting.
The sample preparation order adopting first compacting to freeze again is embodied in: the loading compaction velocity and the process degree of depth that are first controlled pressure head 7 by computer control system 5, make original fluffy soil sample in sampling die three-part pattern be compacted to the pre-set specimen height of computer control system 5 at leisure under the pressure effect of pressure head, thus complete compacting.Then regulate by the flow controller 24 on conveying coolant duct 21 the coolant rate size being conveyed into spiral refrigeration piping 22 from cryostat device 2, and then lower the temperature to the soil sample in sampling die three-part pattern 4; Meanwhile, understand soil sample temperature by the temperature sensor 32 be connected with computer control system 5, when the temperature stabilization measured is when sample is temperature required, namely thinking that cooling terminates, thus completing and freeze.Finally have the sampling die 4 of sample to take out from the cavity volume of sample preparation chamber 3 together with made sample preparation, made sample departed from three-part pattern, then put into constant temperature oven carry out constant temperature maintenance after stand-by.
The sample preparation order first freezing compacting is again adopted to be embodied in: first to regulate by the flow controller 24 on conveying coolant duct 21 the coolant rate size being conveyed into spiral refrigeration piping 22 from cryostat device 2, and then lower the temperature to the soil sample in sampling die three-part pattern 4; Meanwhile, understand soil sample temperature by the temperature sensor 32 be connected with computer control system 5, when the temperature stabilization measured is when sample is temperature required, namely thinking that cooling terminates, thus completing and freeze.Then loading compaction velocity and the process degree of depth of pressure head 7 is controlled by computer control system 5, make original fluffy soil sample in sampling die three-part pattern be compacted to the pre-set specimen height of computer control system 5 at leisure under the pressure effect of pressure head, thus complete compacting.Finally have the sampling die 4 of sample to take out from the cavity volume of sample preparation chamber 3 together with made sample preparation, after made sample is departed from three-part pattern, then put into constant temperature oven carry out constant temperature maintenance after stand-by.
Adopt and freeze while the sample preparation order of compacting is embodied in: regulate by the flow controller 24 on conveying coolant duct 21 the coolant rate size being conveyed into spiral refrigeration piping 22 from cryostat device 2, and then lower the temperature to the soil sample in sampling die three-part pattern 4; Meanwhile, controlled loading compaction velocity and the process degree of depth of pressure head 7 by computer control system 5, make original fluffy soil sample in sampling die three-part pattern be compacted to the pre-set specimen height of computer control system 5 at leisure under the pressure effect of pressure head.Period, understand soil sample temperature by the temperature sensor 32 be connected with computer control system 5, when the temperature stabilization measured is when sample is temperature required, namely think that cooling terminates, complete simultaneously and freeze and compacting.Finally have the sampling die 4 of sample to take out from the cavity volume of sample preparation chamber 3 together with made sample preparation, after made sample is departed from three-part pattern, then put into constant temperature oven carry out constant temperature maintenance after stand-by.
Innovative point of the present invention is, debulking systems and temperature control system are separate, by taking different samplings and sample preparation order to be prepared different frozen soil samples, provide true and reliable sample for studying freezing rate and compacting and freezing order to the test of the impact of the mechanical strength characteristics of soil; And, the setting of spiral refrigeration piping and flow controller more can ensure that in sampling die three-part pattern, soil sample is being prepared in specimen, each position of the upper, middle and lower of soil sample all can uniform decrease in temperature, fast cooling, controllability cooling, thus realize temperature with high efficiency, low energy consumption sample preparation, significantly reduce the cost payout preparing sample in laboratory.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. simulate a sample preparation device for frozen soil self-assembling formation process, it is characterized in that: comprise temperature control system, sample-preparing system, debulking systems and computer control system;
Described temperature control system comprises insulation can, cryostat device and circularly cooling pipeline, and described insulation can is connected with cryostat device by circularly cooling pipeline; Described circularly cooling pipeline comprises conveying coolant duct through successively, spiral refrigeration piping and reclaims coolant duct; Described conveying coolant duct and recovery coolant duct are distributed between insulation can and cryostat device; Described spiral refrigeration piping is positioned at insulation can inside; Described conveying coolant duct is provided with flow controller;
Described sample-preparing system comprises sample preparation chamber and sampling die, and described sample preparation chamber erect type is arranged on insulation can inside, and the upper end open of sample preparation chamber is positioned at insulation can upper surface; Described sampling die can matched be installed in sample preparation chamber cavity volume; The bottom surface of described sample preparation chamber is detachable is provided with bloom, is provided with the temperature sensor that connecting line is connected with computer control system in described bloom; Described spiral refrigeration piping is looped around on sample preparation chamber outer peripheral face in the shape of a spiral;
Described debulking systems comprises loading frame and pressure head; Described loading frame is detachable to be arranged on insulation can upper surface; Described pressure head to be connected with loading frame by depression bar and to be distributed in directly over sample preparation chamber upper end open, and can vertically be pressed in the sampling die in sample preparation chamber cavity volume set by insulation can inside; Loading compaction velocity and the process degree of depth of described pressure head control by computer control system.
2. a kind of sample preparation device of simulating frozen soil self-assembling formation process according to claim 1, is characterized in that: described debulking systems also comprises heat-insulating shield and stop; Described heat-insulating shield to be located at bottom pressure head and identical with pressure head bottom size; The sole piece that described loading frame comprises vertical door frame, contacts with insulation can upper surface; Described sole piece is distributed in the limit, two ends of insulation can upper surface respectively; Described loading frame is done along insulation can upper surface by the roller be provided with bottom its sole piece to move around; Described stop is located on insulation can upper surface, for carrying out spacing to the track that moves around of loading frame.
3. a kind of sample preparation device of simulating frozen soil self-assembling formation process according to claim 1, is characterized in that: be provided with lifting jack bottom described sample preparation chamber bloom, and described lifting jack is used for ejecting completing the sampling die after sample preparation together with made sample; The thermal insulation board identical with bloom bottom size is provided with between lifting jack top bottom described bloom; Described bloom and thermal insulation board can one-body molded after be arranged on lifting jack top.
4. a kind of sample preparation device of simulating frozen soil self-assembling formation process according to claim 1, it is characterized in that: described sample preparation chamber is cylindrical, described sampling die is cylindrical three-part pattern; The internal diameter of described cylindrical sample preparation chamber is identical with the external diameter of three-part pattern; The height of described sample preparation chamber and three-part pattern is 2 times of the specimen height of required system.
5. a kind of sample preparation device of simulating frozen soil self-assembling formation process according to claim 1, is characterized in that: described insulation can inside is filled with the insulation material of isocyanurate foam.
6. simulate a method for making sample for frozen soil self-assembling formation process, it is characterized in that, comprise the steps:
(1) sample preparation device of the simulation frozen soil self-assembling formation process prepared needed for sample, is assembled;
(2), by the loading frame be arranged in above sample preparation device insulation can and pressure head remove directly over sample preparation chamber upper end open, make the upper end open of sample preparation chamber be in unobstructed state;
(3), bottom the columniform cavity volume of sample preparation chamber layer overlay filter paper, then be installed in sample preparation chamber cavity volume after the inside surface of sampling die three-part pattern is evenly coated with last layer silicone oil;
(4), pour into in sampling die three-part pattern by mixing the fluffy soil sample of mixing in advance;
(5), retract loading frame and pressure head, pressure head is distributed in directly over sample preparation chamber upper end open and is in the original state loading compacting operation; Then control the loading compaction velocity of pressure head by computer control system and the process degree of depth makes pressure head cover three-part pattern upper port, now pressure head is in accurate pressure condition, and the heat-insulating shield simultaneously bottom pressure head can be incubated sample preparation chamber;
(6), prepare the frozen soil sample of different self-assembling formation process as required and take different samplings and sample preparation order to be prepared, described sampling comprises that sample is temperature required, freezing rate, and described sample preparation order comprises the sequencing freezing to operate with this two kinds of sample preparations of compacting;
(7), after the sample of simulation frozen soil self-assembling formation process prepares, pressure head is pulled out from compaction state and removes directly over sample preparation chamber upper end open together with loading frame;
(8), by preparation have the sampling die three-part pattern of sample to take out from the cavity volume of sample preparation chamber together with made sample, made sample is taken out from sampling die three-part pattern, then put into constant temperature oven carry out constant temperature maintenance after stand-by.
7. a kind of method for making sample of simulating frozen soil self-assembling formation process according to claim 6, is characterized in that: the sample preparation order of described step (6) is freezed for first compacting again, or first freezes compacting again, or freezes while compacting.
8. a kind of method for making sample of simulating frozen soil self-assembling formation process according to claim 6, it is characterized in that: the sample preparation operation of freezing in described step (6) comprises, regulate by the flow controller on conveying coolant duct the coolant rate size being conveyed into spiral refrigeration piping from cryostat device, and then lower the temperature to the soil sample in sampling die three-part pattern; Understand soil sample temperature by the temperature sensor be connected with computer control system, when the temperature stabilization measured is when sample is temperature required, namely think that cooling terminates, complete and freeze, the average freezing rate of sample can be calculated simultaneously.
9. a kind of method for making sample of simulating frozen soil self-assembling formation process according to claim 6, it is characterized in that: the compacting sample preparation operation in described step (6) comprises, loading compaction velocity and the process degree of depth of pressure head is controlled by computer control system, make original fluffy soil sample in sampling die three-part pattern be compacted to the pre-set specimen height of computer control system at leisure under the pressure effect of pressure head, thus complete compacting.
10. a kind of method for making sample of simulating frozen soil self-assembling formation process according to claim 6, is characterized in that: preparation has the sampling die three-part pattern of sample to eject from sample preparation chamber cavity volume together with made sample by the lifting jack be arranged on bottom sample preparation chamber by described step (8); Put into constant temperature oven after being separated from three-part pattern by made sample again to carry out constant temperature and maintain 48 hours.
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| CN104614217A (en) * | 2015-02-11 | 2015-05-13 | 绍兴文理学院 | Sample preparation method of soft soil three-axis sample with high water content |
| CN105181562A (en) * | 2015-06-09 | 2015-12-23 | 南京交通职业技术学院 | Visualization material test ambient temperature box |
| CN106442035A (en) * | 2016-05-18 | 2017-02-22 | 中国能源建设集团甘肃省电力设计院有限公司 | Production apparatus and production method for concrete-frozen soil contact surface direct shear test sample |
| CN106644653A (en) * | 2017-02-07 | 2017-05-10 | 中国科学院寒区旱区环境与工程研究所 | Device and method for preparing and measuring frozen soil sample |
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| CN112067387B (en) * | 2020-09-04 | 2021-10-26 | 中国矿业大学 | Batch sample preparation device for frozen soil and use method thereof |
| CN113237725A (en) * | 2021-07-13 | 2021-08-10 | 中国科学院、水利部成都山地灾害与环境研究所 | Low-temperature standardized sample preparation device and sample preparation method for ice-soil mixture |
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| GB2616926A (en) * | 2021-11-19 | 2023-09-27 | Univ Anhui Sci & Technology | Sample preparation device for high-ice-content frozen soil blasting model |
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