CN210803220U - Constant head's penetration test device - Google Patents
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- CN210803220U CN210803220U CN201921402902.2U CN201921402902U CN210803220U CN 210803220 U CN210803220 U CN 210803220U CN 201921402902 U CN201921402902 U CN 201921402902U CN 210803220 U CN210803220 U CN 210803220U
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Abstract
The utility model discloses a permeation test device of constant head. The penetration test device comprises a penetration meter and a measuring device, and the penetration meter is connected with the measuring device through a pipeline; the permeameter comprises a base and a cylinder, wherein the base is connected with the cylinder; a water inlet, a diversion trench and an overflow trench are distributed on the side wall of the cylinder from bottom to top, the diversion trench discharges water overflowing from the overflow trench out of the permeameter, a detachable and replaceable filter plate is arranged in the cylinder, and the filter plate is parallel to the base and is higher than the water inlet; when the sample is loaded, the water inlet is communicated with a water supply source, so that water is injected from the bottom of the permeameter; during the test, the water supply source is adjusted to the top of the cylinder, so that water is injected from the top of the permeameter; the measuring device comprises a mirror surface scale plate and a pressure measuring pipe, wherein the mirror surface scale plate is used for measuring the water level of the pressure measuring pipe, and the pressure measuring pipe is fixed in front of the mirror surface scale plate. Compared with the conventional constant head test measuring instrument, the constant head test measuring instrument has the characteristics of light weight, simplicity and convenience in operation, easiness in observation, high measuring precision and the like.
Description
Technical Field
The utility model belongs to the technical field of a geotechnical engineering, concretely relates to constant head penetration test device.
Background
The property of soil to be permeated by water is called soil permeability. The permeability is an important engineering property of the soil body, and has great influence on the strength and deformation of the soil body. The permeability of soil is measured by a permeability coefficient, and the permeability coefficient is a parameter reflecting the seepage performance of water in soil pores and plays an important role in soil treatment of sewage, geotechnical engineering construction and agricultural soil environment research. Therefore, how to accurately, conveniently and accurately measure the permeability coefficient of the soil is crucial in scientific research and work. The permeability coefficient was obtained by a permeation test. At present, a constant head penetration test device is divided into a constant head and a variable head, is a device for measuring the permeability of coarse-grained soil under the action of a constant head, and is widely used in multiple research directions of hydraulics, underground hydrodynamics, hydrology and geology and the like.
The conventional constant head penetration tester on the market controls the height of a water head through a small drain hole, the water discharge is limited, and when the water supply speed is high, the water surface in the tester rises due to untimely water discharge of the drain hole, so that a constant water head cannot be maintained. In addition, the barrel body or the pressure measuring nozzle of the common constant head permeameter on the market are mostly made of metal materials, the condition of the sample inside the permeameter and the condition of air bubble residue cannot be known in the test process, so that the discreteness of the test result is large, and the precision is not high.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems existing in the prior art, the utility model aims to provide a constant head's penetration test device.
The purpose of the utility model is realized through one of following technical scheme at least.
The utility model provides a constant head penetration test device, which comprises a permeameter and a measuring device, wherein the permeameter and the measuring device are connected through a pipeline; the permeameter comprises a base and a cylinder, wherein the base is connected with the cylinder; a water inlet, a diversion trench and an overflow trench are distributed on the side wall of the cylinder from bottom to top, the diversion trench discharges water overflowing from the overflow trench out of the permeameter, a detachable and replaceable filter plate is arranged in the cylinder, and the filter plate is parallel to the base and is higher than the water inlet; when the sample is loaded, the water inlet is communicated with a water supply source, so that water is injected from the bottom of the permeameter; during the test, the water supply source is adjusted to the top of the cylinder, so that water is injected from the top of the permeameter; the measuring device comprises a mirror surface scale plate and a pressure measuring pipe, wherein the mirror surface scale plate is used for measuring the water level of the pressure measuring pipe, the pressure measuring pipe is fixed in front of the mirror surface scale plate, when the water level line of the pressure measuring pipe is superposed with the projection line of the water level line on the mirror surface scale plate, the sight level of a measuring person is indicated, and the reading on the scale plate which is read at the moment is an accurate reading.
Preferably, the permeameter further comprises pressure measuring holes, the pressure measuring holes are distributed on the wall of the cylinder, one end of the pipeline is communicated with the pressure measuring holes, and the other end of the pipeline is communicated with the lower end of the pressure measuring pipe.
Preferably, the pressure measuring holes comprise a first pressure measuring hole, a second pressure measuring hole and a third pressure measuring hole, the first pressure measuring hole, the second pressure measuring hole and the third pressure measuring hole are sequentially arranged on the wall of the cylinder from top to bottom, the pressure measuring pipe comprises a first pressure measuring pipe, a second pressure measuring pipe and a third pressure measuring pipe, the first pressure measuring pipe is communicated with the first pressure measuring hole, the second pressure measuring pipe is communicated with the second pressure measuring hole, and the third pressure measuring pipe is communicated with the third pressure measuring hole.
Preferably, two layers of filter screens are arranged at the pressure measuring hole, are arranged in parallel and are overlapped, and are embedded and fixed on the wall of the cylinder by using an acrylic pipe, so that soil particles are prevented from leaking from the pressure measuring hole, a pipeline is blocked, and the pipeline connection is facilitated; the acrylic pipe comprises a large-diameter acrylic pipe and a small-diameter acrylic pipe, the large-diameter acrylic pipe is sleeved on the small-diameter acrylic pipe, one end of the small-diameter acrylic pipe, which is connected with the two filter screens, is embedded at the pressure measuring hole, and the other end of the small-diameter acrylic pipe is connected with the pipeline.
Preferably, the permeameter is made of an acrylic material.
Preferably, the overflow groove is arc-shaped, the arc-shaped length is 1/4-1/3 of the circumference of the cylinder, the section 1 of the notch of the overflow groove at the inner side of the cylinder wall is smaller than the section 2 of the notch at the outer side of the cylinder wall, the edge of the section 1 is connected with the edge of the section 2 to form an inclined plane, and the included angle formed by the inclined plane and the inner side surface of the cylinder wall is 44-46 degrees.
Preferably, the measuring device further comprises a pressure measuring frame for fixing the pressure measuring tube and the mirror scale plate, and the mirror scale plate is made of acrylic materials. The transparent acryl material can make the whole process of penetration test from leakage test, sample loading and saturation to be visible, especially in the sample saturation process, the water inflow can be controlled according to the observed sample wetting speed, and the local gas collection phenomenon can be intervened in time, so that the saturation effect is ensured, and the test precision is greatly improved.
Preferably, a guide rail is arranged on the side of the pressure measuring frame, so that the mirror scale plate can be lifted and lowered to adapt to the change of a water head and the measurement of permeability coefficients of a plurality of groups of different positions.
Preferably, the measuring device further comprises a pressure measuring pipe support frame arranged below the pressure measuring pipe and used for supporting and fixing the pressure measuring pipe.
Preferably, the pipeline is a transparent silicone tube; the permeameter also comprises a filter plate support used for supporting the filter plate, one end of the filter plate support is contacted with the lower surface of the filter plate, and the other end of the filter plate support is contacted with the upper surface of the bottom surface of the cylinder.
The utility model also provides a method for utilize above-mentioned test device to measure the osmotic coefficient of soil, including following step:
(1) the pressure measuring hole is communicated with the pressure measuring pipe by a transparent silicone tube;
(2) a transparent silicone tube is used for connecting a water supply source as a water supply tube;
(3) a transparent silicone tube is connected with the water inlet and used as an adjusting tube;
(4) the regulating pipe is communicated with a water supply pipe, and water enters the permeameter through the water inlet to reach the water level of the permeameter without the filter plate;
(5) and (3) filling the soil sample into a cylinder of a permeameter in layers, wherein each layer is 2-3 cm thick, slightly tapping the soil sample to a certain thickness by using a wooden hammer to control the porosity ratio of the soil sample, opening a water source after each layer of the sample is filled, and slowly filling water into the permeameter from an inlet until the soil sample is gradually saturated. Filling and saturating the samples layer by layer according to the steps until the sample is 3-4 cm higher than the uppermost pressure measuring hole;
(6) paving a layer of gravel with the thickness of 2cm on the top of the soil sample to serve as a buffer layer, and continuously filling water until water overflows from the overflow groove 2;
(7) after standing for several minutes, checking whether the water level of the pressure measuring pipe is flush with the water level of the overflow tank or not, and adjusting the water level of the pressure measuring pipe by using a water absorption ball to absorb and drain water until the water levels of the pressure measuring pipe and the overflow tank are flush;
(8) raising the pipe orifice of the regulating pipe to be higher than the overflow groove, then separating the regulating pipe from the water supply pipe, placing the water supply pipe in the cylinder of the permeameter, and opening a water source to inject water from the top of the permeameter;
(9) reducing the opening of the adjusting pipe to be positioned at 1/3 on the soil sample to cause water level difference and form top-down seepage, wherein water seeps through the sample and flows out from the adjusting pipe through the water inlet, the water supply speed of the water source is adjusted in the seepage process to ensure that the water supply amount is larger than the overflow amount, and the overflow groove always has water overflow to keep the normal water level;
(10) and recording the water level of each piezometer pipe after the water level of the piezometer pipe to be tested is stable. Starting a stopwatch, and simultaneously using a measuring cylinder to receive the water yield of the water inlet within a certain time;
(11) measuring and recording the water temperatures of the inlet water and the outlet water, and averaging the water temperatures;
(12) reducing the pipe orifice of the adjusting pipe to the middle part and the lower part 1/3 of the soil sample to change the hydraulic slope, repeating the steps (9) to (11), carrying out multiple groups of parallel tests, and recording the reading;
the calculation formula of the permeability coefficient of the soil sample is as follows:
in the formula kT-the permeability coefficient (cm/s) of the soil sample at a water temperature of T ℃;
q-water seepage in t seconds3)；
L is the distance (cm) between the centers of the two pressure measuring pipes;
a-area of cross section of soil sample (cm)2)；
H-average head ([ (H)1-h2)+(h2-h3)]/2) wherein h1For reading of the piezometer tube communicating with the first piezometer hole, h2Is the reading (cm), h of a piezometric tube communicated with the second piezometric hole3The reading of the pressure measuring pipe communicated with the third pressure measuring hole is obtained;
t-time(s).
Compared with the prior art, the utility model has the following beneficial effect and advantage:
the whole body of the permeameter is made of transparent acrylic material, so that the test operation and observation are convenient; the overflow groove enables the water head to be more stable, and the constant water head penetration in the experiment is ensured; the measuring device adopts the acrylic mirror glass with scale marks as the scale plate, so that the reading is more accurate, and the scale plate can move up and down along the guide rail, thereby satisfying the test data measurement of a plurality of positions. Compared with the conventional constant head test instrument, the device has the characteristics of light weight, simplicity and convenience in operation, easiness in observation, high measurement precision and the like.
Drawings
FIG. 1 is a schematic diagram of a constant head permeability test apparatus provided in the examples;
FIG. 2 is a schematic view of a permeameter provided in an embodiment;
FIG. 3 is a schematic view of a measurement apparatus according to an embodiment;
1-pressure measuring hole; 2-an overflow trough; 3-a diversion trench; 4-a water inlet; 5-pressure measuring frame; 6-mirror scale plate; 7-a guide rail; 8-piezometric tube; 9-a pressure measuring pipe support frame; 10-a filter plate; 11-filter plate support; 12-a filter screen; 13-small diameter acrylic tube; 14-large diameter acrylic tube; 101-a first pressure tap; 102-a second pressure tap; 103-a third pressure tap; 801-first piezometric tube; 802-second piezometer tube; 803-third piezometric tube.
Detailed Description
The following description is provided to further explain the embodiments of the present invention by referring to the embodiments and the accompanying drawings, but the invention is not limited thereto.
Examples
The embodiment provides a constant head penetration test device, which comprises a permeameter and a measuring device, wherein the permeameter and the measuring device are connected through a transparent silicone tube; the permeameter comprises a base and a cylinder, wherein the base is connected with the cylinder; a water inlet 4, a diversion trench 3 and an overflow trench 2 are distributed on the side wall of the cylinder from bottom to top, the diversion trench 3 discharges water overflowing from the overflow trench 2 out of the permeameter, a filter plate 10 is arranged in the cylinder, the filter plate 10 is parallel to the base and is arranged higher than the water inlet 4, and when the sample is loaded, the water inlet is communicated with a water supply source, so that water is injected from the bottom of the permeameter; during the test, the water supply source is adjusted to the top of the cylinder, so that water is injected from the top of the permeameter; the measuring device comprises a mirror surface scale plate 6 and a pressure measuring pipe 8, the mirror surface scale plate is used for measuring the water level of the pressure measuring pipe, the pressure measuring pipe is fixed in front of the mirror surface scale plate through a support frame, when the water level line of the pressure measuring pipe is superposed with the projection line of the water level line on the mirror surface scale plate, the sight level of a measurer is indicated, and the reading read at the moment on the scale plate is an accurate reading.
The permeameter further comprises pressure measuring holes 1, the pressure measuring holes 1 are distributed on the wall of the cylinder, one end of the transparent silicone tube is communicated with the pressure measuring holes 1, and the other end of the transparent silicone tube is communicated with the lower end of the pressure measuring tube 8. The pressure measuring hole comprises a first pressure measuring hole 101, a second pressure measuring hole 102 and a third pressure measuring hole 103, the first pressure measuring hole 101, the second pressure measuring hole 102 and the third pressure measuring hole 103 are sequentially arranged on the cylinder wall from top to bottom, the pressure measuring pipe comprises a first pressure measuring pipe 801, a second pressure measuring pipe 802 and a third pressure measuring pipe 803, the first pressure measuring pipe 801 is communicated with the first pressure measuring hole 101, the second pressure measuring pipe 802 is communicated with the second pressure measuring hole 102, and the third pressure measuring pipe 803 is communicated with the third pressure measuring hole 103.
Two layers of filter screens are arranged at the pressure measuring hole 1, are arranged in parallel and are overlapped, and are embedded and fixed on the wall of the cylinder by an acrylic tube, so that soil particles are prevented from leaking out of the pressure measuring hole 1, the transparent silicone tube is blocked, and the transparent silicone tube is favorably connected; the acrylic tube comprises a large-diameter acrylic tube 14 and a small-diameter acrylic tube 13, the large-diameter acrylic tube 14 is sleeved on the small-diameter acrylic tube 13, one end of the small-diameter acrylic tube 13, which is connected with the two layers of filter screens, is embedded and fixed at the pressure measuring hole 1, and the other end of the small-diameter acrylic tube is connected with the transparent silicone tube.
The permeameter is made of an acrylic material. The overflow groove 2 is arc-shaped, the arc-shaped length is 1/3 of the circumference of the cylinder, the section 1 of the notch of the overflow groove 2 at the inner side of the cylinder wall is smaller than the section 2 of the notch at the outer side of the cylinder wall, the edge of the section 1 and the edge of the section 2 form an inclined plane, and the included angle formed by the inclined plane and the inner side surface of the cylinder wall is 45 degrees. The measuring device further comprises a pressure measuring frame 5 for fixing a pressure measuring pipe 8 and a mirror surface scale plate 6, wherein the mirror surface scale plate 6 is made of acrylic materials. The side of the pressure measuring frame 5 is provided with a guide rail 7, so that the mirror surface scale plate 6 can be lifted and lowered to adapt to the change of a constant head and the measurement of permeability coefficients of a plurality of groups of different positions. The measuring device further comprises a pressure measuring pipe support frame 9 which is arranged below the pressure measuring pipe 8 and used for supporting and fixing the pressure measuring pipe 8.
The utility model also provides a method for utilize above-mentioned test device to measure the osmotic coefficient of soil, including following step:
(1) the pressure measuring hole 1 is communicated with the pressure measuring pipe 8 by a transparent silicone tube.
(2) The transparent silicone tube is connected with a water supply source as a water supply tube.
(3) The transparent silicone tube is connected with the water inlet 4 and used as an adjusting tube.
(4) The adjusting pipe is communicated with a water supply pipe, and water enters the permeameter through the water inlet 4 to reach the water level of the permeameter and is filtered by the filter plate 10.
(5) And (3) filling the soil sample into a cylinder of a permeameter in layers, wherein each layer is 2cm thick, lightly compacting by using a wooden hammer, opening a water source after each layer of the sample is filled, so that water slowly enters the permeameter from an inlet 4, and filling the water until the sample is gradually saturated. And (5) filling and saturating the samples layer by layer according to the steps until the sample is 3cm higher than the uppermost pressure measuring hole.
(6) And paving a layer of gravel with the thickness of 2cm on the top of the soil sample to serve as a buffer layer, and continuously filling water until the overflow groove 2 overflows.
(7) After standing for 2 minutes, checking whether the water level of the pressure measuring pipe 8 is flush with the water level of the overflow groove 2, if not, adjusting the water level of the pressure measuring pipe 8 by using a water absorption ball to absorb air and discharge water until the water levels of the pressure measuring pipe 8 and the overflow groove 2 are flush.
(8) The orifice of the regulating pipe is raised to be higher than the overflow groove 2, then the regulating pipe is separated from the water supply pipe, the water supply pipe is arranged in the cylinder of the permeameter, and the water source is opened to inject water from the top of the permeameter.
(9) The mouth of the adjusting pipe is lowered to be positioned at 1/3 on the upper part of the sample to cause water level difference, so as to form seepage from top to bottom, water seeps through the sample and flows out from the adjusting pipe through the water inlet 4, in the seepage process, the water supply speed of a water source is adjusted to ensure that the water supply quantity is larger than the overflow quantity, and the overflow trough 2 always has water overflow to keep the normal water level.
(10) And recording the water level of each piezometer tube after the water level of the piezometer tube 8 to be tested is stable. And starting the stopwatch, and simultaneously using the measuring cylinder to receive the water yield of the water inlet 4 within a certain time.
(11) And measuring and recording the water temperatures of the inlet water and the outlet water, and averaging.
(12) And (5) lowering the pipe orifice of the adjusting pipe to the middle part and the lower part 1/3 of the soil sample to change the hydraulic slope, repeating the steps (9) to (11), performing multiple groups of parallel tests, and recording the reading.
Formula for calculating permeability coefficient of soil sample
In the formula kT-the permeability coefficient (cm/s) of the soil sample at a water temperature of T ℃;
q-water seepage in t seconds3)；
L is the distance (cm) between the centers of the two pressure measuring pipes;
a-area of cross section of soil sample (cm)2)；
H-average head ([ (H)1-h2)+(h2-h3)]/2) wherein h1For reading of the piezometer tube communicating with the first piezometer hole, h2Is the reading (cm), h of a piezometric tube communicated with the second piezometric hole3The reading of the pressure measuring pipe communicated with the third pressure measuring hole is obtained;
t-time(s).
The specific experimental data obtained in the examples are shown in table 1.
TABLE 1 specific test data obtained in the examples
Table 270 type permeameter experimental data
In order to verify the accuracy of the infiltration system of the present invention, a comparison experiment was conducted on the same soil sample using a 70-type infiltration system, the experimental data are shown in table 2. comparing table 1 and table 2, it can be found that ① the water head (i.e., H) measured by the infiltration system of the present invention1And H2Difference) is obviously less than 70 type permeameter, which shows that the novel infiltration system of the experiment has good exhaust effect, low bubble residual rate inside the device and more uniform prepared sample, ② the infiltration coefficient measured by the infiltration system of the utility model is more concentrated, and the difference between the highest infiltration coefficient and the lowest infiltration coefficient is 0.04 multiplied by 10-1cm/s, and the permeability coefficients measured with a model 70 permeameter are comparatively dispersed, the highest and lowest permeability coefficients differing by 0.31X 10-1cm/s, the utility model discloses the infiltration system measurement accuracy is high, the error is little.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any equivalent changes, modifications or evolutions made by those skilled in the art to the above embodiments by using the technical solutions of the present invention still belong to the scope of the technical solutions of the present invention.
Claims (10)
1. The constant head penetration test device is characterized by comprising a penetration meter and a measuring device, wherein the penetration meter and the measuring device are connected through a pipeline; the permeameter comprises a base and a cylinder, the cylinder is vertically connected with the base, and the base is used for supporting the cylinder; a water inlet and an overflow groove are distributed on the side wall of the cylinder from bottom to top, a filter plate is arranged in the cylinder, and the filter plate is parallel to the base and is higher than the water inlet; the measuring device comprises a mirror surface scale plate and a pressure measuring pipe, wherein the mirror surface scale plate is used for measuring the water level of the pressure measuring pipe, the pressure measuring pipe is fixed in front of the mirror surface scale plate, when the water level line of the pressure measuring pipe is superposed with the projection line of the water level line on the mirror surface scale plate, the sight level of a measuring person is indicated, and the read reading on the scale plate is an accurate reading; the permeameter further comprises pressure measuring holes, the pressure measuring holes are distributed on the wall of the cylinder, one end of the pipeline is communicated with the pressure measuring holes, and the other end of the pipeline is communicated with the lower end of the pressure measuring pipe.
2. The constant head penetration test device according to claim 1, wherein a diversion trench is further distributed on the cylinder, and the diversion trench is positioned below the overflow groove and used for discharging water overflowing from the overflow groove out of the penetration meter.
3. The permeability test device for a constant head according to claim 1, wherein the pressure taps include a first pressure tap, a second pressure tap, and a third pressure tap, the first pressure tap, the second pressure tap, and the third pressure tap are sequentially disposed on the wall of the cylinder from top to bottom, the pressure measuring pipes include a first pressure measuring pipe, a second pressure measuring pipe, and a third pressure measuring pipe, the first pressure measuring pipe is communicated with the first pressure tap, the second pressure measuring pipe is communicated with the second pressure tap, and the third pressure measuring pipe is communicated with the third pressure tap.
4. The constant head permeability test device of claim 1, wherein a filter screen is provided at the pressure measuring hole, and the filter screen is embedded in the cylinder wall by using an acrylic pipe, so as to prevent soil particles from leaking from the pressure measuring hole, block the pipeline and facilitate the connection of the pipeline; the acrylic pipe comprises a large-diameter acrylic pipe and a small-diameter acrylic pipe, the large-diameter acrylic pipe is sleeved on the small-diameter acrylic pipe, one end of the small-diameter acrylic pipe, which is connected with the filter screen, is embedded at the pressure measuring hole, and the other end of the small-diameter acrylic pipe is connected with the pipeline.
5. The constant head penetration test apparatus of claim 4, wherein the screens are two layers, the two layers being disposed in parallel overlapping relation.
6. The constant head permeability test device of claim 1, wherein the permeameter is made of an acrylic material; the filter plate in the cylinder is detachably arranged.
7. The constant head penetration test device according to claim 1, wherein the overflow groove is arc-shaped, the arc-shaped length is 1/4-1/3 of the circumference of the cylinder, the section 1 of the notch of the overflow groove at the inner side of the cylinder wall is smaller than the section 2 of the notch at the outer side of the cylinder wall, the edge of the section 1 is connected with the edge of the section 2 to form an inclined plane, and the inclined plane forms an included angle of 44-46 degrees with the inner side face of the cylinder wall.
8. The constant head permeability test device according to claim 1, wherein the measuring device further comprises a pressure measuring frame for fixing the pressure measuring tube and the mirror scale plate, and the mirror scale plate is made of acrylic material: the side of the pressure measuring frame is provided with a guide rail, so that the mirror surface scale plate can be lifted and lowered to adapt to the change of a water head and the measurement of permeability coefficients of a plurality of groups of different positions.
9. The permeability test device for a constant head according to claim 1, wherein the measuring device further comprises a pressure measuring pipe support frame disposed below the pressure measuring pipe for supporting and fixing the pressure measuring pipe.
10. The constant head penetration test apparatus according to claim 1, wherein the conduit is a transparent silicone tube; the permeameter also comprises a filter plate support used for supporting the filter plate, one end of the filter plate support is contacted with the lower surface of the filter plate, and the other end of the filter plate support is contacted with the upper surface of the bottom surface of the cylinder.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666060A (en) * | 2020-12-17 | 2021-04-16 | 北京航空航天大学 | Penetration tester for researching soil body penetration destruction characteristics |
| CN113218842A (en) * | 2021-04-30 | 2021-08-06 | 中建五局土木工程有限公司 | On-site testing method and on-site testing device for unsaturated permeability coefficient |
| CN113310839A (en) * | 2021-05-28 | 2021-08-27 | 中国科学院武汉岩土力学研究所 | Water head-controllable soft rock moisture absorption test device and test method |
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2019
- 2019-08-27 CN CN201921402902.2U patent/CN210803220U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666060A (en) * | 2020-12-17 | 2021-04-16 | 北京航空航天大学 | Penetration tester for researching soil body penetration destruction characteristics |
| CN113218842A (en) * | 2021-04-30 | 2021-08-06 | 中建五局土木工程有限公司 | On-site testing method and on-site testing device for unsaturated permeability coefficient |
| CN113310839A (en) * | 2021-05-28 | 2021-08-27 | 中国科学院武汉岩土力学研究所 | Water head-controllable soft rock moisture absorption test device and test method |
| CN113310839B (en) * | 2021-05-28 | 2022-04-08 | 中国科学院武汉岩土力学研究所 | Water head-controllable soft rock moisture absorption test device and test method |
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