CN107782593B - Movable sand leaking device and sample preparation method for preparing sandy soil by using same - Google Patents
Movable sand leaking device and sample preparation method for preparing sandy soil by using same Download PDFInfo
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- CN107782593B CN107782593B CN201710842989.4A CN201710842989A CN107782593B CN 107782593 B CN107782593 B CN 107782593B CN 201710842989 A CN201710842989 A CN 201710842989A CN 107782593 B CN107782593 B CN 107782593B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention discloses a movable sand leaking device which comprises two fixed guide rails, a pair of movable guide rails and a sand leaking device, wherein the fixed guide rails are symmetrically arranged, the movable guide rails can slide along the fixed guide rails, the sand leaking device is movably arranged on the movable guide rails, the sand leaking device comprises a sand collecting hopper, a sand outlet guide pipe and a sand outlet head, the sand collecting hopper, the sand outlet guide pipe and the sand outlet head are connected from top to bottom, and the sand outlet guide pipe is connected with the movable guide rails through a hopper fixing device. The movable sand leaking device utilizes the fixed guide rail and the movable guide rail, so that the sand leaking device can freely move all around above the mold box, effectively covers sand filling at different corners of the mold box, abandons the complex procedures of local sand filling and manual vibration in the sand filling process of the conventional mold box, and effectively overcomes the defect of uneven filling of the conventional method.
Description
Technical Field
The invention relates to an indoor sandy soil model test device and a sample preparation method thereof, in particular to a movable sand leaking device and a sample preparation method for preparing sandy soil by using the same.
Background
In the engineering field, in order to evaluate the safety and reliability of some projects, a field test or an indoor model test for simulating actual projects is often required to be developed, and in view of higher cost and longer period of the field test, the indoor model test is adopted for research in most cases. The sandy soil can be repeatedly used, and parameters such as gradation, strength index and the like are easy to control, so that the sandy soil is used as a preferred soil sample for an indoor model test. However, the good or bad preparation of the sandy soil sample is directly related to the reliability degree of the test result. At present, the indoor model test mainly adopts methods such as a vibration method, a compaction method, an insertion and tamping method, a sand rain method and the like to prepare a sandy soil sample. The vibration method and the compaction method are similar to the actual sand backfilling process, but cannot be directly applied to large-scale indoor model experiments; the sand rain method can well simulate a natural sand layer formed by natural deposition, a formed sample is closer to an actual natural sand layer, the application in an indoor model experiment is facilitated, and the sample preparation reliability is good. Although some sand rain method devices have appeared at present, the position of the sand leakage device cannot be adjusted at any time according to the width of the mold box by the existing sand rain method sample device, and the flow speed and the flow quantity of the sand outlet cannot be effectively controlled.
Therefore, it is desired to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a movable sand leaking device which can effectively cover sand filling at each corner of a mold box, overcome the phenomena of uneven sand compactness and the like, and simultaneously can prepare sand samples with different mold box sizes and sand samples with different compactness requirements.
The invention also aims to provide a sample preparation method for preparing sandy soil by using the movable sand leaking device.
The technical scheme is as follows: in order to achieve the above purpose, the movable sand leaking device of the present invention comprises two symmetrically arranged fixed guide rails, a pair of movable guide rails capable of sliding along the fixed guide rails, and a sand leaking device movably arranged on the movable guide rails, wherein the sand leaking device comprises a sand collecting funnel, a sand discharging conduit and a sand discharging head which are connected from top to bottom, and the sand discharging conduit is connected with the movable guide rails through a funnel fixing device. The movable sand leaking device utilizes the fixed guide rail and the movable guide rail, so that the sand leaking device can move left and right and front above the mold box, the sand filling at different corners of the mold box is effectively covered, the complex procedures of local sand filling and manual vibration in the sand filling process of the conventional mold box are abandoned, and the defect of uneven filling of the conventional method is effectively overcome.
The funnel fixing device comprises four steel plates which are vertically distributed, lateral pulleys which are positioned on the outer side edges of the steel plates and can slide along the side wall of the movable guide rail, and bottom pulleys which are positioned on the bottom edges of the steel plates and can slide along the bottom surface of the movable guide rail.
Preferably, a sand outlet flow switch is arranged on the sand outlet guide pipe and close to the sand collecting hopper, and comprises a switch circular plate which is positioned in the sand outlet guide pipe and is concentric with the cross section of the sand outlet guide pipe and a switch handle, one end of the switch circular plate is connected with the switch circular plate, and the other end of the switch handle extends out of the sand outlet guide pipe; wherein, the rotating switch handle can drive the switch round plate to rotate around the central line thereof, and the size of the horizontal included angle of the switch round plate is changed. The sand outlet flow switch is arranged at the upper part of the sand outlet guide pipe, the switch handle can be rotated according to the sand outlet amount requirement, the horizontal included angle of the switch round plate is adjusted, the sand amount control of the cross section of the sand outlet guide pipe is realized, the size of the sand outlet flow switch is turned on at any time, the sand outlet amount in unit time is adjusted, and the defects of uneven local height of sand filling in a conventional method are overcome.
Furthermore, the lower part of the sand outlet guide pipe is sleeved with at least 1 layer of telescopic guide pipe. The lower part of the sand outlet guide pipe in the movable sand leaking device is provided with the telescopic guide pipe, the telescopic guide pipe can be stretched according to the required sand compactness requirement, the falling distance between the sand outlet and the sand surface of the mold box is adjusted, and the defects of uneven sand compactness, poor integrity and the like in the conventional sand filling method are overcome.
Furthermore, go out sand head and the outer wall threaded connection of scalable pipe, the inside of this sand head is equipped with an inverted triangle toper sand distributor. According to the invention, the inverted triangular-cone-shaped sand separator is arranged in the sand outlet head, so that sandy soil in the guide pipe can be effectively separated and uniformly sprinkled in an annular shape, the density of a sprinkled sandy soil sample is uniform, and the defect of non-uniformity of a sand sample caused by linear sprinkling and splashing of sand in a conventional method is overcome.
Preferably, the movable guide rail is an L-shaped steel plate, strip-shaped slots are formed in two ends of the bottom of the L-shaped steel plate, and each strip-shaped slot is connected with a guide rail pulley.
Moreover, the cross-sectional shape of sand collection funnel is for falling the triangular pyramid or semicircle sphere, and the volume excrement is in gathering the sand soil.
The invention relates to a sample preparation method for preparing sandy soil by utilizing a movable sand leaking device, which comprises the following steps:
A. preparing a model box for preparing sandy soil, and arranging upright posts for fixing a movable sand leaking device at four corners of the model box respectively;
B. a fixed guide rail is arranged on each two adjacent upright columns, the distance between two guide rail pulleys on each movable guide rail is determined according to the width of the model box, and after the guide rail pulleys are fixed on the movable guide rails, the movable guide rails are placed on the fixed guide rails;
C. placing a sand leaking device on the movable guide rails, enabling a sand outlet guide pipe to penetrate through a gap between the two movable guide rails, and installing a sand outlet head at the lower ends of the sand outlet guide rails, wherein the sand leaking device can freely and horizontally move on the movable guide rails through lateral pulleys and bottom pulleys on a funnel fixing device;
D. according to specific sand grading, determining different sand outlet head heights h by adjusting the telescopic guide pipes, performing a relative compactness test on the sand spilled by each sand outlet head height, determining the sand outlet head heights under different compactness conditions, and further determining the sand outlet head height of the sand with compactness required by the test;
E. d, adjusting the telescopic guide pipe according to the height of the sand outlet head determined in the step D, filling sand in the sand collecting hopper, opening a sand outlet flow switch, moving a sand leaking device and a moving guide rail, sprinkling sand at different positions in the mold box, stretching or shortening the telescopic guide pipe at any time according to the sand surface accumulation height, and adjusting the height of the sand outlet head to keep the height from the sand outlet head to the sand surface unchanged;
F. and after the preparation of the sandy soil sample in the mold box is finished, closing the sand outlet flow switch, and disassembling the sand outlet head, the sand leaking device, the movable guide rail and the fixed guide rail.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: firstly, the movable sand leaking device utilizes the fixed guide rail and the movable guide rail to enable the sand leaking device to freely move all around above the model box, effectively cover different corners of the model box for sandy soil filling, abandon the complicated procedures of local sand filling and manual vibration in the sand filling process of the conventional model box, and effectively overcome the defect of uneven filling of the conventional method; then the lower part of the sand outlet guide pipe in the movable sand leaking device is provided with a telescopic guide pipe, the telescopic guide pipe can be stretched according to the requirement of the required sand compactness, the falling distance between a sand outlet and the sand surface of the mold box is adjusted, and the defects of uneven sand compactness, poor integrity and the like of the sand filling in the conventional sand filling method are overcome; secondly, the upper part of the sand outlet guide pipe is provided with a sand outlet flow switch, a switch handle can be rotated according to the sand outlet amount requirement, the horizontal included angle of a switch circular plate is adjusted, the sand amount control of the cross section of the sand outlet guide pipe is realized, the size of the sand outlet flow switch is turned on at any time, the sand outlet amount in unit time is adjusted, and the defects of uneven height of local sand filling parts and the like in the conventional method are overcome; in addition, the inverted triangular conical sand separator is arranged in the sand outlet head, so that sandy soil in the guide pipe can be effectively separated and uniformly sprinkled in an annular shape, the density of a sprinkled sandy soil sample is uniform, and the defect of non-uniformity of a sand sample caused by linear sprinkling and splashing of sand in a conventional method is overcome; finally, the sample preparation method of the movable sand leaking device can be used for preparing sandy soil with different compactness requirements, the sample preparation is simple, convenient and easy to operate, and the movable sand leaking device can be repeatedly disassembled and used, is easy to popularize, and has the advantages of high accuracy, strong practicability and the like.
Drawings
FIG. 1 is a schematic cross-sectional view of a mold box and a sand leaking device according to the present invention;
FIG. 2 is a schematic plan view of a mold box and a sand leaking device according to the present invention;
FIG. 3 is a schematic structural view of a sand leaking device according to the present invention;
FIG. 4(a) is a schematic view showing a first structure of a sand-collecting hopper according to the present invention;
FIG. 4(b) is a schematic view of a second construction of the sand hopper of the present invention;
FIG. 5(a) is a schematic structural view of a sand outlet head connected to 1 layer of telescopic pipes in the invention;
FIG. 5(b) is a schematic structural view of the sand outlet head connected to the 2 layers of telescopic pipes in the present invention;
FIG. 6 is a schematic structural view of a sanding head according to the present invention;
FIG. 7 is a schematic cross-sectional view of a sanding head and telescoping conduit according to the present invention;
FIG. 8 is a schematic cross-sectional view of a sand flow control switch according to the present invention;
FIG. 9 is a schematic plan view of the moving rail of the present invention;
fig. 10 is a schematic sectional view of the fixed rail, the moving rail and the sand leaking device in the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1 and 2, the movable sand leaking device of the present invention comprises a fixed guide rail 1, a movable guide rail 2 and a sand leaking device 3. The present invention prepares a mold box 5 for preparing sand, and the width dimension of the mold box 5 is marked b x l. And the four corners of the model box 5 are respectively provided with a vertical column 6 for fixing the movable sand leaking device; every two adjacent upright posts 6 are provided with fixed guide rails 1, and the two fixed guide rails 1 are symmetrically distributed. The pair of movable guide rails 2 can slide along the fixed guide rails 1, the movable guide rails 2 are L-shaped steel plates, strip-shaped slots 201 are formed in two ends of the bottom of each L-shaped steel plate, and each strip-shaped slot 201 is connected with a guide rail pulley 202 through a bolt. The space between the two rail pulleys 202 on each moving rail 2 is determined according to the width of the mold box 5, so that the rail pulleys 202 are fixed on the moving rail 2 by the locking bolts, and then the moving rail 2 is placed on the fixed rail 1, and the moving rail 2 can freely move back and forth in the fixed rail 1 through the rail pulleys 202 at both ends, as shown in fig. 9 and 10.
As shown in fig. 3, the movable guide rail 2 is provided with a sand-leaking device 3 capable of sliding back and forth along the movable guide rail 2, the sand-leaking device 3 comprises a sand-collecting hopper 301, a sand-discharging conduit 302 and a sand-discharging head 303 connected from top to bottom, and the sand-discharging conduit 302 is connected with the movable guide rail 2 through a hopper fixing device 304. The hopper fixing device 304 comprises four steel plates 305 vertically distributed with each other, 2 lateral pulleys 306 located at the outer side edge of each steel plate 305 and capable of sliding along the side wall of the moving guide rail, and a bottom pulley 307 located at the bottom edge of each steel plate and capable of sliding along the bottom surface of the moving guide rail. Wherein each steel plate 305 is welded to form an integral body along the longitudinal direction of the sand discharge duct 302. The movable sand leaking device utilizes the fixed guide rail and the movable guide rail, so that the sand leaking device can freely move all around above the mold box, effectively covers sand filling at different corners of the mold box, abandons the complex procedures of local sand filling and manual vibration in the sand filling process of the conventional mold box, and effectively overcomes the defect of uneven filling of the conventional method.
As shown in fig. 4(a) and 4(b), the cross-sectional shape of the sand-collecting hopper 301 is an inverted triangular cone or a semi-spherical shape, so that the sand-collecting hopper has a large capacity to collect sand and soil, and can satisfy at least a sand-containing amount of 100N.
As shown in fig. 5(a) and 5(b), the lower portion of the sand discharge pipe 302 is fitted with at least 1 layer of the retractable pipe 308. Wherein the sand outlet pipe 302 is a single-layer steel pipe with a length of at least 500mm, the telescopic pipe 308 connected with the lower part of the sand outlet pipe is a multi-layer steel pipe with an inner diameter d1Outside diameter of d2Wherein d is2＞d1The length of the multi-layer steel pipe is more than or equal to 25mm, the total length of the sand outlet conduit 302 can be increased by stretching the multi-layer steel pipe, the height h between the sand outlet head 303 and the sand surface 7 is adjusted, and the telescopic conduit 308 is fixed with the sand outlet conduit 302 through a bolt at the upper end after being stretched to a required position. The retractable conduit 308 can be provided with 3 layers or more than 3 layers according to actual requirements. The lower part of the sand outlet guide pipe in the movable sand leaking device is provided with the telescopic guide pipe, the telescopic guide pipe can be stretched according to the required sand compactness requirement, the falling distance between the sand outlet and the sand surface of the mold box is adjusted, and the defects of uneven sand compactness, poor integrity and the like in the conventional sand filling method are overcome.
As shown in fig. 6 and 7, the sand outlet head 303 of the present invention is connected with the outer wall of the telescopic conduit 308 by screw threads, and an inverted triangular conical sand separator 309 is fixed inside the sand outlet head 303 by the uniformly distributed connecting plates 8. Wherein the diameter of the sand outlet head is d4The inverted triangular pyramidal sand separator 309 has a diameter d3，d4＞d3＞d2＞d1. According to the invention, the inverted triangular-cone-shaped sand separator is arranged in the sand outlet head, so that sandy soil in the guide pipe can be effectively separated and uniformly sprinkled in an annular shape, the density of a sprinkled sandy soil sample is uniform, and the defect of non-uniformity of a sand sample caused by linear sprinkling and splashing of sand in a conventional method is overcome.
A sand outlet flow switch 4 is arranged on the sand outlet conduit 302 and close to the sand collecting funnel 301. As shown in fig. 8, the sand flow switch 4 includes a switch circular plate 401 located in the sand conduit and concentrically arranged with the cross section of the sand conduit, and a switch handle 402 having one end connected to the switch circular plate and one end extending out of the sand conduit; wherein, rotating the switch handle 402 can drive the switch round plate 401 to rotate around its central line, and change the horizontal angle of the switch round plate 401. When the sand flow switch 4 is turned off, the switch round plate 401 is in a horizontal device and is completely closed with the inner wall of the sand outlet conduit 302, and when the switch is completely turned on, the switch round plate is 90 degrees with the horizontal. The sand outlet flow switch is arranged at the upper part of the sand outlet guide pipe, the switch handle can be rotated according to the sand outlet amount requirement, the horizontal included angle of the switch round plate is adjusted, the sand amount control of the cross section of the sand outlet guide pipe is realized, the size of the sand outlet flow switch is turned on at any time, the sand outlet amount in unit time is adjusted, and the defects of uneven local height of sand filling in a conventional method are overcome.
The invention relates to a sample preparation method for preparing sandy soil by utilizing a movable sand leaking device, which comprises the following steps:
A. preparing a model box 5 for preparing sandy soil, and arranging upright posts 6 for fixing a movable sand leaking device at four corners of the model box 5 respectively;
B. a fixed guide rail 1 is arranged on each two adjacent upright posts 6, the distance between two guide rail pulleys 202 on each movable guide rail 2 is determined according to the width of the model box 5, and after the guide rail pulleys 202 are fixed on the movable guide rails 2, the movable guide rails 2 are placed on the fixed guide rails 1;
C. placing the sand leaking device 3 on the movable guide rails 2, enabling the sand outlet guide pipe 302 to penetrate through a gap between the two movable guide rails 2, and installing a sand outlet head 303 at the lower ends of the sand outlet guide rails 302, wherein the sand leaking device 3 freely and horizontally moves on the movable guide rails through lateral pulleys 306 and bottom pulleys 307 on a hopper fixing device 304;
D. according to specific sand gradation, the heights h of different sand outlets 303 are determined by adjusting the telescopic guide pipes 308, the relative compactness test is carried out on the sand spilled by the height of each sand outlet 303, the heights of the sand outlets 303 under the conditions of different compactnesses are determined, and then the heights of the sand outlets 303 of the sands with the compactnesses required by the test are determined;
E. d, adjusting the telescopic guide pipe 308 according to the height of the sand outlet head determined in the step D, filling sand in the sand collecting hopper 301, turning on the sand outlet flow switch 4, moving the sand leaking device 3 and the moving guide rail 2, sprinkling sand at different positions in the model box 5, stretching or shortening the telescopic guide pipe 308 at any time according to the sand surface accumulation height, and adjusting the height of the sand outlet head to keep the height from the sand outlet head to the sand surface unchanged;
F. and after the preparation of the sandy soil sample in the model box is finished, closing the sand outlet flow switch 4, and disassembling the sand leaking device 3, the movable guide rail 2 and the fixed guide rail 1.
The sample preparation method of the movable sand leaking device can be used for preparing sandy soil with different compactness requirements, the sample preparation is simple and convenient, the operation is easy, the movable sand leaking device can be repeatedly disassembled and used, the popularization is easy, and the movable sand leaking device has the advantages of high accuracy, strong practicability and the like.
Claims (7)
1. The utility model provides a movable sand leaking device which characterized in that: the sand-leaking device comprises two fixed guide rails (1) which are symmetrically arranged, a pair of movable guide rails (2) which can slide along the fixed guide rails (1) and a sand-leaking device (3) which is movably arranged on the movable guide rails (2), wherein the sand-leaking device (3) comprises a sand-collecting funnel (301), a sand-discharging conduit (302) and a sand-discharging head (303) which are connected from top to bottom, and the sand-discharging conduit (302) is connected with the movable guide rails (2) through funnel fixing devices (304); the funnel fixing device (304) comprises four steel plates (305) which are vertically distributed, lateral pulleys (306) which are positioned on the outer side edges of the steel plates and can slide along the side walls of the movable guide rail, and bottom pulleys (307) which are positioned on the bottom edges of the steel plates and can slide along the bottom surface of the movable guide rail.
2. The mobile sand drain of claim 1, wherein: a sand outlet flow switch (4) is arranged on the sand outlet guide pipe (302) and close to the sand collecting hopper (301), and the sand outlet flow switch (4) comprises a switch circular plate (401) which is positioned in the sand outlet guide pipe and is concentrically arranged with the cross section of the sand outlet guide pipe and a switch handle (402) of which one end is connected with the switch circular plate and the other end extends out of the sand outlet guide pipe; wherein, the switch handle (402) is rotated to drive the switch round plate (401) to rotate around the central line thereof, and the size of the horizontal included angle of the switch round plate (401) is changed.
3. The mobile sand drain of claim 1, wherein: the lower part of the sand outlet guide pipe (302) is sleeved with at least 1 layer of telescopic guide pipe (308).
4. The mobile sand leakage device according to claim 3, wherein: the sand outlet head (303) is in threaded connection with the outer wall of the telescopic guide pipe (308), and an inverted triangular conical sand separator (309) is arranged inside the sand outlet head (303).
5. The mobile sand drain of claim 1, wherein: the movable guide rail (2) is an L-shaped steel plate, strip-shaped slots (201) are formed in two ends of the bottom of the L-shaped steel plate, and a guide rail pulley (202) is connected to each strip-shaped slot (201).
6. The mobile sand drain of claim 1, wherein: the cross section of the sand collection funnel (301) is in an inverted triangular cone shape or a semi-spherical shape.
7. A sample preparation method for preparing sandy soil by using the movable sand leaking device as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
A. a model box (5) for preparing sandy soil is prepared, and upright posts (6) for fixing a movable sand leaking device are respectively arranged at four corners of the model box (5);
B. a fixed guide rail (1) is arranged on each two adjacent upright columns (6), the distance between two guide rail pulleys (202) on each movable guide rail (2) is determined according to the width of a model box (5), and after the guide rail pulleys (202) are fixed on the movable guide rails (2), the movable guide rails (2) are placed on the fixed guide rails (1);
C. placing a sand leaking device (3) on the movable guide rails (2), enabling a sand outlet guide pipe (302) to penetrate through a gap between the two movable guide rails (2), and installing a sand outlet head (303) at the lower ends of the sand outlet guide rails (302), wherein the sand leaking device (3) freely and horizontally moves on the movable guide rails through lateral pulleys (306) and bottom pulleys (307) on a funnel fixing device (304);
D. according to specific sand grading, determining the heights h of different sand outlet heads (303) by adjusting the telescopic guide pipes (308), carrying out a relative compactness test on the sand spilled by the height of each sand outlet head (303), determining the heights of the sand outlet heads (303) under the conditions of different compactnesses, and further determining the heights of the sand outlet heads (303) of the compactness sand required by the test;
E. d, adjusting a telescopic guide pipe (308) according to the height of the sand outlet head determined in the step D, filling sand in a sand collecting hopper (301), opening a sand outlet flow switch (4), moving a sand leaking device (3) and a moving guide rail (2), sprinkling sand at different positions in a mold box (5), stretching or shortening the telescopic guide pipe (308) at any time according to the sand surface accumulation height, and adjusting the height of the sand outlet head to keep the height from the sand outlet head to the sand surface unchanged;
F. and after the preparation of the sandy soil sample in the model box is finished, closing the sand outlet flow switch (4), and disassembling the sand leaking device (3), the movable guide rail (2) and the fixed guide rail (1).
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| CN201710842989.4A CN107782593B (en) | 2017-09-18 | 2017-09-18 | Movable sand leaking device and sample preparation method for preparing sandy soil by using same |
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| CN201710842989.4A CN107782593B (en) | 2017-09-18 | 2017-09-18 | Movable sand leaking device and sample preparation method for preparing sandy soil by using same |
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| US11953470B2 (en) * | 2018-05-31 | 2024-04-09 | Yeditepe Universitesi | Automatic funnel control device |
| CN108801793A (en) * | 2018-09-11 | 2018-11-13 | 山东大学 | One kind drenches with rain method sanding device and its test method |
| CN110653153A (en) * | 2019-10-10 | 2020-01-07 | 江苏科技大学 | One-stop sand rain method sample preparation device and use method thereof |
| CN110747919A (en) * | 2019-11-19 | 2020-02-04 | 安徽省交通勘察设计院有限公司 | Sand burying device and device for grooving and sand burying on soil surface of model |
| CN111521469B (en) * | 2020-06-19 | 2023-07-21 | 长安大学 | Model test device for three-degree-of-freedom manual preparation of foundation soil and working method |
| CN114109301B (en) * | 2020-08-31 | 2023-07-25 | 中国石油天然气股份有限公司 | Sand filling switch and sand filling device |
| CN112326526A (en) * | 2020-10-23 | 2021-02-05 | 深圳大学 | Constant head infiltration experimental apparatus |
| CN113702119B (en) * | 2021-06-08 | 2022-10-14 | 同济大学 | Device and method for preparing low-disturbance high-saturation sandy soil sample in model test |
| CN113447636A (en) * | 2021-06-16 | 2021-09-28 | 西安理工大学 | Sand rain device |
| CN113848107A (en) * | 2021-09-15 | 2021-12-28 | 天津大学 | Saturated sandy soil preparation device and method suitable for indoor geotechnical model test tank |
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