A soil water characteristic curve measuring device and method based on standard soil sample method

Abstract

The present application relates to the technical field of ecological geotechnical test, and provides a soil water characteristic curve measuring device and method based on a standard soil sample method.The soil water characteristic curve measuring device comprises a clamping component, a sample storage component and a detection component.The clamping component comprises a first clamping plate, a second clamping plate and a connecting assembly, and the first clamping plate and the second clamping plate are connected through the connecting assembly.The sample storage component is located between the first clamping plate and the second clamping plate, and comprises a first sample storage part and a second sample storage part, and the first end face of the first sample storage part is oppositely arranged with the first end face of the second sample storage part.The first clamping plate and the second clamping plate are adapted to move closer to or farther away from each other along the length direction of the connecting assembly.The soil water characteristic curve measuring device is assembled through the clamping component, the sample storage component and the detection component, the obtained measuring device has a simple structure, can directly measure the parameters of the to-be-measured soil sample at the sampling position, does not need to transport the to-be-measured soil sample, and improves the determination efficiency of the soil water characteristic curve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ecological geotechnical test, and particularly relates to a soil water characteristic curve measuring device and method based on a standard soil sample method. BACKGROUND

[0002] The soil water characteristic curve is an important nonlinear constitutive model for describing the water retention characteristics of unsaturated soil, and has important application value in estimating the water retention and absorption performance of unsaturated soil, predicting the unsaturated strength, and calculating the water conductivity reduction of unsaturated soil. The existing test equipment for the soil water characteristic curve can be divided into water absorption and dehydration control systems, matrix suction measurement systems, and volume moisture content measurement systems according to various functional components, and the determination principle is one-to-one correspondence determination of the volume moisture content and the matrix suction in the soil moisture absorption and dehydration process.

[0003] However, the existing measuring equipment is bulky, and needs to rely on a quiet and fully equipped laboratory environment, so that the problem of transporting undisturbed soil samples to the test base cannot be avoided, and the test period of the undisturbed soil sample is long, which affects the determination efficiency of the soil water characteristic curve. SUMMARY

[0004] The present application aims to solve at least one of the problems in the related art. To this end, the present application provides a soil water characteristic curve measuring device based on a standard soil sample method, which has a simple structure and can directly measure the relevant parameters of the measured soil sample at the sampling location, without the need to transport the measured soil sample, thereby improving the determination efficiency of the soil water characteristic curve.

[0005] The present application also provides a soil water characteristic curve measuring method based on a standard soil sample method.

[0006] According to the soil water characteristic curve measuring device based on the standard soil sample method provided by the first aspect of the present application, the device comprises:

[0007] The clamping component comprises a first clamping plate, a second clamping plate, and a connecting assembly, the first clamping plate and the second clamping plate are arranged at intervals along a predetermined direction, and are connected through the connecting assembly;

[0008] The sample storage component is located between the first clamping plate and the second clamping plate, and comprises a first sample storage member and a second sample storage member, the first sample storage member is provided with a first sample storage cavity, and the second sample storage member is provided with a second sample storage cavity, the first sample storage member is used for loading a standard soil sample, the second sample storage member is used for loading a measured soil sample, the first end face of the first sample storage member is arranged opposite to the first end face of the second sample storage member, the first end face of the first sample storage member is provided with a first opening, and the second end face of the second sample storage member is provided with a second opening;

[0009] The first clamping plate and the second clamping plate are adapted to move towards or away from each other along the length direction of the connecting assembly, so that the first end face of the second sample storage member is pressed against or released from the first end face of the first sample storage member.

[0010] A detection component connected with the first sample storage member and the second sample storage member, and used for measuring the change of the water content of the standard soil sample and the change of the water content of the to-be-tested soil sample.

[0011] According to the soil water characteristic curve measuring device based on the standard soil sample method provided by the embodiment of the present application, the first clamping plate is fixedly connected with the first end of the connecting assembly, the second end of the first sample storage member is connected to one side of the first clamping plate facing the second clamping plate, the second end of the second sample storage member is connected to one side of the second clamping plate facing the first clamping plate, and the second clamping plate is movably connected with the second end of the connecting assembly.

[0012] According to the soil water characteristic curve measuring device based on the standard soil sample method provided by the embodiment of the present application, the one side of the first clamping plate facing the second clamping plate is provided with a mounting groove, and the second end of the first sample storage member is mounted in the mounting groove.

[0013] According to the soil water characteristic curve measuring device based on the standard soil sample method provided by the embodiment of the present application, the clamping component further comprises:

[0014] A first sealing member adapted to surround the first end face of the first sample storage member and the first end face of the second sample storage member at the same time.

[0015] According to the soil water characteristic curve measuring device based on the standard soil sample method provided by the embodiment of the present application, the connecting assembly comprises:

[0016] A plurality of connecting rods, the first end of the connecting rod is connected with the first clamping plate, and the second end of the connecting rod is slidably connected with the second clamping plate.

[0017] A plurality of fasteners, each of the fasteners is detachably connected with the second end of the corresponding connecting rod in a one-to-one manner, and the fastener is adapted to abut against the side of the second clamping plate facing away from the first clamping plate.

[0018] According to the soil water characteristic curve measuring device based on the standard soil sample method provided by the embodiment of the present application, the side wall of the first sample storage member and the side wall of the second sample storage member abut against the connecting rod.

[0019] Alternatively, the connecting assembly further comprises a support member, and the side wall of the first sample storage member and the side wall of the second sample storage member are connected to the connecting rod through the support member.

[0020] The soil water characteristic curve measuring device based on the standard soil sample method according to the embodiment of the present application comprises a detection component, a data acquisition instrument, at least two first detection pieces and at least two second detection pieces, wherein the first detection pieces and the second detection pieces are connected with the data acquisition instrument;

[0021] The side wall of the first sample storage piece is provided with at least two first detection holes, and each first detection piece is connected with a corresponding first detection hole in one-to-one correspondence.

[0022] The side wall of the second sample storage piece is provided with at least two second detection holes, and each second detection piece is connected with a corresponding second detection hole in one-to-one correspondence.

[0023] According to the embodiment of the present application, one of the first detection holes is arranged at the first end of the first sample storage piece, and the other first detection hole is arranged at the second end of the first sample storage piece.

[0024] One of the second detection holes is arranged at the first end of the second sample storage piece, and the other second detection hole is arranged at the second end of the second sample storage piece.

[0025] The soil water characteristic curve measuring method based on the standard soil sample method according to the second aspect of the embodiment of the present application is based on the soil water characteristic curve measuring device based on the standard soil sample method according to any one of the above embodiments, and comprises the following steps:

[0026] Prepare a standard sample and a test sample, and determine the standard sample parameters of the standard sample.

[0027] Connect the first clamping plate and the second clamping plate through the connecting assembly, connect the first sample storage piece loaded with the standard sample to the first clamping plate, and connect the second sample storage piece loaded with the test sample to the second clamping plate.

[0028] Push the second clamping plate to move towards the first clamping plate, so that the first end face of the second sample storage piece is pressed against the first end face of the first sample storage piece, and the first sample storage cavity and the second sample storage cavity are communicated.

[0029] Connect the detection component with the first sample storage piece and the second sample storage piece respectively to detect the change of the water content of the standard sample and the change of the water content of the test sample.

[0030] The application provides a soil water characteristic curve measurement method based on a standard soil sample method.

[0031] The first detection member is sealingly connected to the first detection hole, the moisture content change of the standard soil sample is detected through the first detection member, and the moisture content data of the standard soil sample is recorded.

[0032] The second detection member is sealingly connected to the second detection hole, the moisture content change of the to-be-tested soil sample is detected through the second detection member, and the moisture content data of the to-be-tested soil sample is recorded.

[0033] The one or more technical solutions in the embodiments of the application have at least one of the following technical effects.

[0034] The soil water characteristic curve measurement device provided by the embodiments of the application can make the standard soil sample and the to-be-tested soil sample contact and diffuse water through the following steps: after the preliminary loading of the first clamping plate, the second clamping plate, the connecting assembly, the first sample storage member and the second sample storage member is completed, the first clamping plate and the second clamping plate are moved towards each other along the length direction of the connecting assembly, the first end face of the second sample storage member is pressed against the first end face of the first sample storage member, at this time, the first opening is in communication with the second opening, the first sample storage cavity is in communication with the second sample storage cavity, and the standard soil sample and the to-be-tested soil sample can be made to contact and diffuse water. Then, the moisture content change of the standard soil sample and the to-be-tested soil sample is measured through the detection member, and the related parameters for constructing the soil water characteristic curve are obtained. The measurement device obtained by assembling the clamping member, the sample storage member and the detection member has a simple structure and is convenient to carry. The related parameter measurement of the to-be-tested soil sample can be directly performed at the sampling position, and the to-be-tested soil sample does not need to be transported, so that the measurement efficiency of the soil water characteristic curve is improved.

[0035] Additional aspects and advantages of the application will be described in the following description and further will appear upon examination of the description. It will be understood that the detailed description and specific examples, while indicating embodiments of the application, are given by way of illustration only, since various changes and modifications within the spirit and scope of the application will become apparent to those skilled in the art from this detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0037] Figure 1 FIG. 1 is a perspective structural schematic view of the soil water characteristic curve measurement device provided by the embodiments of the application;

[0038] Figure 2is a front view structural schematic diagram of a soil water characteristic curve measuring device provided by an embodiment of the present application;

[0039] Figure 3 is a three-dimensional structural schematic diagram of a clamping component provided by an embodiment of the present application;

[0040] Figure 4 is a front view structural schematic diagram of a clamping component provided by an embodiment of the present application;

[0041] Figure 5 is a sectional view structural schematic diagram of a first sample storage component provided by an embodiment of the present application;

[0042] Figure 6 is a sectional view structural schematic diagram of a second sample storage component provided by an embodiment of the present application;

[0043] Figure 7 is a flow chart of a soil water characteristic curve measuring method provided by an embodiment of the present application.

[0044] Reference signs:

[0045] 100, clamping component; 110, first clamping plate; 111, mounting groove; 120, second clamping plate; 130, connecting assembly; 131, connecting rod; 132, fastener; 140, first sealing component; 200, sample storage component; 210, first sample storage component; 211, first detection hole; 212, first sample storage cavity; 220, second sample storage component; 221, second detection hole; 222, second sample storage cavity. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be further described below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0047] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the embodiments of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "connected", "connected to", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] In the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0050] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0051] The following will be described in conjunction with Figures 1 to 6 The soil water characteristic curve measuring device provided by the first aspect of the present application is described.

[0052] Figure 1 The three-dimensional structure schematic diagram of the soil water characteristic curve measuring device provided by the present application is illustrated, Figure 2 The front view structure schematic diagram of the soil water characteristic curve measuring device provided by the present application is illustrated, as Figure 1 And Figure 2As shown, the soil water characteristic curve measuring device comprises a clamping component 100, a sample storage component 200 and a detection component. The clamping component 100 comprises a first clamping plate 110, a second clamping plate 120 and a connecting assembly 130, the first clamping plate 110 and the second clamping plate 120 are arranged in a predetermined direction and connected through the connecting assembly 130, wherein the predetermined direction extends along the length direction of the connecting assembly 130 (i.e. the predetermined direction is from left to right in the figure). Figure 2

[0053] The sample storage component 200 is located between the first clamping plate 110 and the second clamping plate 120, and comprises a first sample storage member 210 and a second sample storage member 220. The first sample storage member 210 is provided with a first sample storage cavity 212, and the second sample storage member 220 is provided with a second sample storage cavity 222. The first sample storage member 210 is used for loading a standard soil sample, and the second sample storage member 220 is used for loading a to-be-tested soil sample. The first end face of the first sample storage member 210 is oppositely arranged with the first end face of the second sample storage member 220. The first end face of the first sample storage member 210 is provided with a first opening, and the second end face of the second sample storage member 220 is provided with a second opening.

[0054] The first clamping plate 110 and the second clamping plate 120 are adapted to move towards or away from each other along the length direction of the connecting assembly 130, so as to press or release the first end face of the first sample storage member 210 by the first end face of the second sample storage member 220. When the first clamping plate 110 and the second clamping plate 120 move towards each other along the length direction of the connecting assembly 130, the first end face of the first sample storage member 210 is pressed by the first end face of the second sample storage member 220. When the first clamping plate 110 and the second clamping plate 120 move away from each other along the length direction of the connecting assembly 130, the first end face of the first sample storage member 210 is released by the first end face of the second sample storage member 220.

[0055] The first sample storage member 210 and the second sample storage member 220 are connected with the detection component, and the detection component is used for measuring the change of the water content of the standard soil sample and the change of the water content of the to-be-tested soil sample.

[0056] ​According to the soil water characteristic curve measuring device provided by the embodiment of the present application, after the preliminary loading of the first clamping plate 110, the second clamping plate 120, the connecting assembly 130, the first sample storage part 210 and the second sample storage part 220 is completed, the first clamping plate 110 and the second clamping plate 120 are moved close to each other along the length direction of the connecting assembly 130, the first end surface of the second sample storage part 220 is pressed against the first end surface of the first sample storage part 210, at this time, the first opening is communicated with the second opening, so that the first sample storage cavity 212 is communicated with the second sample storage cavity 222, that is, the standard soil sample and the to-be-measured soil sample are contacted and the water molecules in the soil samples move, so that the water content of the standard soil sample and the to-be-measured soil sample changes, and the related parameters for constructing the soil water characteristic curve are obtained. The measuring device obtained by assembling the clamping part 100, the sample storage part 200 and the detection part has a simple structure and is convenient to carry, and the related parameters of the to-be-measured soil sample can be measured directly at the sampling position without the need of transporting the to-be-measured soil sample, so that the efficiency of measuring the soil water characteristic curve is improved.

[0057] Specifically, after the first clamping plate 110 and the second clamping plate 120 are connected through the connecting assembly 130, the first sample storage part 210 and the second sample storage part 220 are installed between the first clamping plate 110 and the second clamping plate 120 in sequence, so that the preliminary loading of the measuring device is completed, at this time, the axis of the first sample storage cavity 212 and the axis of the second sample storage cavity 222 are located on the same horizontal line.

[0058] Then, the second clamping plate 120 and the first clamping plate 110 are moved close to each other by pushing, the distance between the first clamping plate 110 and the second clamping plate 120 is reduced, so that the first sample storage part 210 and the second sample storage part 220 are moved towards each other, the first end surface of the second sample storage part 220 is pressed against the first end surface of the first sample storage part 210, at this time, the first opening is communicated with the second opening, and the first sample storage cavity 212 and the second sample storage cavity 222 are communicated, so that the standard soil sample in the first sample storage part 210 is contacted with the to-be-measured soil sample in the second sample storage part 220, so that the water molecules in the soil samples move, and the water content of the standard soil sample and the to-be-measured soil sample changes. Then, the change of the water content of the standard soil sample and the to-be-measured soil sample is measured by the detection part, and the related calculation parameters are obtained, so that the corresponding matrix suction is calculated, and the soil water characteristic curve is obtained.

[0059] It should be noted that in the embodiment, the first sample storage part 210 and the second sample storage part 220 are both ring knives, so that the first sample storage part 210 and the second sample storage part 220 can be used to collect the standard soil sample or the to-be-measured soil sample in addition to loading the soil samples.

[0060] It should be noted that, in the embodiment, after the first end face of the second sample storage member 220 is pressed against the first end face of the first sample storage member 210 and the detection member is connected to the first sample storage member 210 and the second sample storage member 220, the soil water characteristic curve measuring device can be placed in a heat preservation box, and the temperature in the heat preservation box is 40-50°C, so as to accelerate the movement of water molecules in the soil sample. Specifically, the soil water characteristic curve measuring device is preferably placed in a high-temperature environment of 45°C.

[0061] In the embodiment of the application, in order to realize the mutual approach of the second clamping plate 120 and the first clamping plate 110, the first clamping plate 110 is fixedly connected to the first end of the connecting assembly 130, the second end of the first sample storage member 210 is connected to one side of the first clamping plate 110 facing the second clamping plate 120, the second end of the second sample storage member 220 is connected to one side of the second clamping plate 120 facing the first clamping plate 110, and the second clamping plate 120 is movably connected to the second end of the connecting assembly 130. By fixedly connecting the first clamping plate 110 to the first end of the connecting assembly 130 and movably connecting the second clamping plate 120 to the second end of the connecting assembly 130, the mutual approach of the first clamping plate 110 and the second clamping plate 120 is realized by pushing the second clamping plate 120 to move from the second end of the connecting assembly 130 to the first end of the connecting assembly 130 (i.e. from right to left in FIG. 1). Figure 2 In addition, since the second end of the second sample storage member 220 is connected to one side of the second clamping plate 120 facing the first clamping plate 110, when the second clamping plate 120 moves towards the first clamping plate 110, the second clamping plate 120 pushes the second sample storage member 220 to move towards the first clamping plate 110, so that the first end face of the second sample storage member 220 is pressed against the first end face of the first sample storage member 210.

[0062] It should be noted that, in order to realize the mutual approach of the second clamping plate 120 and the first clamping plate 110, the first clamping plate 110 can also be movably connected to the first end of the connecting assembly 130, and the second clamping plate 120 can be fixedly connected to the second end of the connecting assembly 130. Then, the mutual approach of the first clamping plate 110 and the second clamping plate 120 is realized by pushing the first clamping plate 110 to move from the first end of the connecting assembly 130 to the second end of the connecting assembly 130 (i.e. from left to right in FIG. 1). Figure 2 In addition, since the second end of the second sample storage member 220 is connected to one side of the second clamping plate 120 facing the first clamping plate 110, when the second clamping plate 120 moves towards the first clamping plate 110, the second clamping plate 120 pushes the second sample storage member 220 to move towards the first clamping plate 110, so that the first end face of the second sample storage member 220 is pressed against the first end face of the first sample storage member 210.

[0063] Alternatively, the first clamping plate 110 can be movably connected to the first end of the connecting assembly 130, and the second clamping plate 120 can be movably connected to the second end of the connecting assembly 130. Then, the mutual approach of the first clamping plate 110 and the second clamping plate 120 is realized by pushing the first clamping plate 110 to move from the first end of the connecting assembly 130 to the second end of the connecting assembly 130, and pushing the second clamping plate 120 to move from the second end of the connecting assembly 130 to the first end of the connecting assembly 130 at the same time.

[0064] Further, Figure 3 A perspective view of the clamping component is shown in the figure, Figure 4 A perspective view of the clamping component is shown in the figure, Figure 3 And Figure 4 As shown in the figure, the first clamping plate 110 is provided with a mounting groove 111 on the side facing the second clamping plate 120, and the second end of the first sample storage member 210 is mounted in the mounting groove 111 to connect the second end of the first sample storage member 210 to the side of the first clamping plate 110 facing the second clamping plate 120, thereby fixing the first sample storage member 210 to the first clamping plate 110.

[0065] It should be noted that the connection between the first sample storage member and the first clamping plate is not limited to the above-mentioned manner, and can also be achieved by using fasteners such as angle brackets.

[0066] In the embodiment of the present application, as shown in the figure, Figures 1 to 4 The clamping component 100 further comprises a first sealing member 140, which is adapted to surround the first end face of the first sample storage member 210 and the first end of the second sample storage member 220 simultaneously.

[0067] Further, when the first end face of the second sample storage member 220 presses the first end face of the first sample storage member 210, the first sealing member 140 surrounds the first end face of the first sample storage member 210 and the first end face of the second sample storage member 220 simultaneously to seal the first end face of the first sample storage member 210 and the first end face of the second sample storage member 220, thereby improving the sealing performance of the connection between the first sample storage member 210 and the second sample storage member 220. When the standard soil sample and the to-be-tested soil sample are in contact and water diffusion occurs, the water in the soil will not flow out from the connection between the first sample storage member 210 and the second sample storage member 220, thereby improving the accuracy of the change in the water content of the standard soil sample and the to-be-tested soil sample determined.

[0068] Specifically, in the embodiment, the first sealing member 140 can be arranged on the first end face of the first sample storage member 210, and when the second sample storage member 220 moves towards the first sample storage member 210, the first end face of the second sample storage member 220 presses the first sealing member 140 to seal the first end face of the first sample storage member 210 and the first end face of the second sample storage member 220.

[0069] The first sealing member 140 can also be arranged on the second end face of the second sample storage member 220, and when the second sample storage member 220 moves towards the first sample storage member 210, the first sealing member 140 presses the first end face of the first sample storage member 210 to seal the first end face of the first sample storage member 210 and the first end face of the second sample storage member 220.

[0070] It should be noted that the first sealing member 140 is a circular rubber ring, which is used to seal the first sample storage member 210 and the second sample storage member 220, and protect the first end face of the first sample storage member 210 and the first end face of the second sample storage member 220 by virtue of the flexibility of the rubber ring. Of course, the first sealing member 140 is not limited to a circular rubber ring, and can also be a rubber sealing gasket or other flexible sealing element.

[0071] Further, the clamping component 100 further comprises a second sealing member and a third sealing member, the second sealing member is adapted to surround the second end face of the first sample storage member 210 and the bottom surface of the mounting groove 111 at the same time, so as to seal the second end face of the first sample storage member 210 and the bottom surface of the mounting groove 111, and improve the sealing performance between the first sample storage member 210 and the first clamping plate 110.

[0072] The third sealing member is adapted to surround the second end face of the second sample storage member 220 and the side surface of the second clamping plate 120 facing the first clamping plate 110 at the same time, so as to seal the second end face of the second sample storage member 220 and the side surface of the first clamping plate 110, and improve the sealing performance between the second sample storage member 220 and the second clamping plate 120.

[0073] It should be noted that the second sealing member and the third sealing member can be a rubber sealing gasket, or a sealing element such as a rubber sealing ring.

[0074] In the embodiment of the present application, as shown in Figure 3 and Figure 4 The connecting assembly 130 comprises a plurality of connecting rods 131 and a plurality of fasteners 132, the first end of the connecting rod 131 is connected with the first clamping plate 110, and the second end of the connecting rod 131 is connected with the second clamping plate 120 in a sliding manner, so that by pushing the second clamping plate 120 to slide from the second end of the connecting rod 131 to the first end of the connecting rod 131, the second clamping plate 120 can be pushed to move close to the first clamping plate 110, and then the second sample storage member 220 is pushed to move towards the first sample storage member 210, and the first end face of the second sample storage member 220 is pressed against the first end face of the first sample storage member 210.

[0075] Each fastener 132 is detachably connected with the second end of the corresponding connecting rod 131, and the fastener 132 is adapted to abut against the side surface of the second clamping plate 120 away from the first clamping plate 110. Then, when the first end face of the second sample storage member 220 abuts against the first end face of the first sample storage member 210, the fastener 132 is abutted against the side surface of the second clamping plate 120 away from the first clamping plate 110, so as to fix the second clamping plate 120, and avoid the second clamping plate 120 from moving away from the first clamping plate 110 under the reaction force of the second sample storage member 220, so as to ensure that the second sample storage member 220 is pressed against the first sample storage member 210.

[0076] Specifically, in the embodiment, a plurality of through holes are formed on the first clamping plate 110, and the first end of each connecting rod 131 is inserted into the corresponding through hole of the first clamping plate 110 in one-to-one correspondence. The first end of the connecting rod 131 is fixed to the side of the first clamping plate 110 away from the second clamping plate 120 through the through hole, so as to realize the connection between the first end of the connecting rod 131 and the first clamping plate 110.

[0077] A plurality of through holes are also formed on the second clamping plate 120, and the second end of each connecting rod 131 is inserted into the corresponding through hole of the second clamping plate 120 in one-to-one correspondence. The connecting rod 131 is a threaded rod, and the fastener 132 is a nut. The nut is screwed into the second end of the connecting rod 131, so as to realize the detachable connection between the fastener 132 and the connecting rod 131.

[0078] In the embodiment of the application, in order to realize the installation of the first sample storage member 210 and the second sample storage member 220 between the first clamping plate 110 and the second clamping plate 120, and ensure that the first end face of the first sample storage member 210 and the first end face of the second sample storage member 220 abut without dislocation, the installation mode of the first sample storage member 210, the second sample storage member 220 and the connecting assembly 130 can adopt any one of the following installation modes:

[0079] In the first installation mode, the side wall of the first sample storage member 210 and the side wall of the second sample storage member 220 abut the connecting rod 131, so that the plurality of connecting rods 131 can limit the first sample storage member 210 and the second sample storage member 220, thereby ensuring that the first sample storage member 210 and the second sample storage member 220 do not dislocate when the inner diameters of the cavities of the first sample storage member 210 and the second sample storage member 220 are equal, and reducing the number of parts of the measuring device.

[0080] In the second installation mode, the connecting assembly 130 further includes a support member, and the side wall of the first sample storage member 210 and the side wall of the second sample storage member 220 are connected to the connecting rod 131 through the support member. The first sample storage member 210 and the second sample storage member 220 are limited by the support member, so as to further improve the stability of the installation of the first sample storage member 210 on the first clamping plate 110 and the stability of the installation of the second sample storage member 220 on the second clamping plate 120.

[0081] Specifically, in the embodiment, the support member can be a square plate, and the square plate is provided with a mounting hole. The first sample storage member 210 is installed in the square plate through the mounting hole, and the second sample storage member 220 is installed in the square plate through the mounting hole. The square plate is also provided with a plurality of through holes, and the connecting rod 131 is slidably arranged in the through holes.

[0082] Further, when the second clamping plate 120 pushes the second sample storage member 220 to move towards the first sample storage member 210, the square plate can move relative to the connecting rod 131, so as to ensure that the support does not limit the movement of the first sample storage member 210 and the second sample storage member 220 while improving the installation stability of the first sample storage member 210 and the second sample storage member 220 by the support.

[0083] In the embodiment of the application, the detection component includes a data acquisition instrument, at least two first detection members and at least two second detection members, the side wall of the first sample storage member 210 is provided with at least two first detection holes 211, and each first detection member is connected to a corresponding first detection hole 211 one by one. The side wall of the second sample storage member 220 is provided with at least two second detection holes 221, and each second detection member is connected to a corresponding second detection hole 221 one by one. Thus, the change of the water content of the standard soil sample in the first sample storage member 210 is measured by the first detection member, the change of the water content of the to-be-detected soil sample in the second sample storage member 220 is measured by the second detection member, and relevant calculation parameters are obtained to calculate the corresponding matrix suction, so as to obtain the soil-water characteristic curve.

[0084] The first detection member and the second detection member are connected to the data acquisition instrument, so that the data measured by the first detection member and the second detection member are collected by the data acquisition instrument.

[0085] Specifically, in the embodiment, the first detection member and the second detection member are both moisture sensors, the probe of the moisture sensor is inserted into the first detection hole 211 or the second detection hole 221 and contacts the corresponding soil sample, so as to obtain the change of the water content of the corresponding soil sample.

[0086] It should be noted that, in the embodiment, the connection between the first detection member and the first detection hole 211 and the connection between the second detection member and the first detection hole 211 are both provided with sealing members, so as to realize the sealed connection of the first detection member and the first detection hole 211 and the sealed connection of the second detection member and the second detection hole 221, so as to avoid the leakage of the moisture of the soil sample from the detection hole and improve the accuracy of the detection of the water content. Specifically, the sealing member is a waterproof adhesive tape.

[0087] Further, Figure 5 A cross-sectional structure schematic view of the first sample storage member provided by the embodiment of the application is shown, Figure 6 A cross-sectional structure schematic view of the second sample storage member provided by the embodiment of the application is shown, Figure 5 and Figure 6As shown in the figure, one of the first detection holes 211 is arranged at the first end of the first sample storage member 210, and the other first detection hole 211 is arranged at the second end of the first sample storage member 210, so as to measure the change of the soil water content of the standard soil sample at the two ends of the first sample storage member 210. One of the second detection holes 221 is arranged at the first end of the second sample storage member 220, and the other second detection hole 221 is arranged at the second end of the second sample storage member 220, so as to measure the change of the soil water content of the to-be-tested soil sample at the two ends of the second sample storage member 220. When the measurement data of the two first detection members and the two second detection members are equal and remain unchanged, at this time, the matrix suction between the soil samples reaches the suction balance, and by recording the standard soil sample water content data and the to-be-tested soil sample water content data at this time, the corresponding soil sample matrix suction can be obtained by calculation.

[0088] It should be noted that, preferably, when the height of the second sample storage member 220 is h1, the height l1 of one of the second detection holes 221 from the end of the second end of the second sample storage member 220 is 1 / 5 h1, and the height l2 of the other second detection hole 221 from the end of the second end of the second sample storage member 220 is 4 / 5 h1.

[0089] When the height of the first sample storage member 210 is h2, and the height of the mounting groove 111 in the first clamping plate 110 is h3, the height l3 of one of the first detection holes 211 from the end of the second end of the first sample storage member 210 is h3+l1, and the height l4 of the other first detection hole 211 from the end of the second end of the first sample storage member 210 is h2-l1.

[0090] The soil water characteristic curve measurement method provided by the second aspect of the present application will be described below. Figure 7 The soil water characteristic curve measurement method provided by the second aspect of the present application will be described below.

[0091] The soil water characteristic curve measurement method provided by the second aspect of the present application will be described below. Figure 7 The flow chart of the soil water characteristic curve measurement method provided by the second aspect of the present application is shown in the figure. Figure 7 As shown in the figure, the soil water characteristic curve measurement method comprises the following steps:

[0092] In step 100, a standard sample and a to-be-tested sample are prepared, and the standard sample parameter of the standard sample is measured.

[0093] In this embodiment, the undisturbed clay or clay loam with a higher saturated water content is taken as an example, a soil column of a corresponding size is collected by the first sample storage member 210, and the standard sample parameter of the collected soil column is measured, wherein the standard sample parameter of the soil column includes the dry capacity γ of the soil sample, the particle size gradation, the saturated volume water content θ s , and the residual volume water content θr and saturated permeability coefficient k s and the TRIM method is used to determine the VG model fitting parameters (α, n, m, l) in the wetting and drying paths.

[0094] Step 200, connecting the first clamp plate 110 and the second clamp plate 120 through the connecting assembly 130, and connecting the first sample storage member 210 loaded with the standard sample to the first clamp plate 110 and connecting the second sample storage member 220 loaded with the sample to be tested to the second clamp plate 120.

[0095] Specifically, the first end of the connecting rod 131 is inserted into the through hole of the first clamp plate 110, the second end of the connecting rod 131 is inserted into the through hole of the second clamp plate 120, and the fastener 132 is abutted to the side of the second clamp plate 120 away from the first clamp plate 110, thereby completing the connection of the first clamp plate 110 and the second clamp plate 120 through the connecting rod 131.

[0096] Subsequently, the second end of the first sample storage member 210 is installed in the installation groove 111, the second end of the second sample storage member 220 is abutted to the side of the second clamp plate 120 facing the first clamp plate 110, and the first sample storage member 210 and the second sample storage member 220 are limited by the plurality of connecting rods 131, thereby completing the preliminary loading of the measuring device.

[0097] Step 300, pushing the second clamp plate 120 to move towards the first clamp plate 110, so that the first end face of the second sample storage member 220 is pressed against the first end face of the first sample storage member 210, so that the first sample storage cavity 212 and the second sample storage cavity 222 are communicated.

[0098] By pushing the second clamp plate 120 to move from the second end of the connecting assembly 130 to the first end of the connecting assembly 130, the second clamp plate 120 and the first clamp plate 110 are pushed to move closer to each other, so that the second clamp plate 120 pushes the second sample storage member 220 to move towards the first clamp plate 110, so that the first end face of the second sample storage member 220 is pressed against the first end face of the first sample storage member 210, thereby communicating the first sample storage cavity 212 and the second sample storage cavity 222, so that the standard soil sample in the first sample storage member 210 and the soil sample to be tested in the second sample storage member 220 are in contact, so that the water molecules in the soil sample move, so that the water content of the standard soil sample and the water content of the soil sample to be tested change.

[0099] Step 400, connecting the detection components to the first sample storage member 210 and the second sample storage member 220 respectively to detect the change of the water content of the standard sample and the change of the water content of the sample to be tested, thereby obtaining relevant calculation parameters to calculate the corresponding matrix suction, thereby obtaining the soil-water characteristic curve.

[0100] Specifically, step 400 includes the following steps:

[0101] Step 410, sealingly connecting the first detection member to the first detection hole 211, detecting the change of the water content of the standard soil sample through the first detection member, and recording the water content data of the standard soil sample.

[0102] In this embodiment, the probe of the first detection member is inserted into the first detection hole 211, and the probe of the first detection member is in contact with the standard soil sample to determine the change of the water content of the standard soil sample. At the same time, the waterproof strip is arranged at the connection between the first detection member and the first detection hole 211 to achieve the sealing connection of the first detection member and the first detection hole 211, so as to avoid the water in the standard soil sample from leaking out of the first detection hole 211.

[0103] Step 420, sealingly connecting the second detection member to the second detection hole 221, detecting the change of the water content of the soil sample to be measured through the second detection member, and recording the water content data of the soil sample to be measured.

[0104] In this embodiment, the probe of the second detection member is inserted into the second detection hole 221, and the probe of the second detection member is in contact with the soil sample to be measured to determine the change of the water content of the soil sample to be measured. At the same time, the waterproof strip is arranged at the connection between the second detection member and the second detection hole 221 to achieve the sealing connection of the second detection member and the second detection hole 221, so as to avoid the water in the soil sample to be measured from leaking out of the second detection hole 221.

[0105] The change of the water content of the standard soil sample is determined by the first detection member, and the change of the water content of the soil sample to be measured is determined by the second detection member. When the determination data of the two first detection members and the two second detection members are equal and remain unchanged, the matrix suction between the soil samples reaches the suction balance at this time. By recording the water content data of the standard soil sample and the water content data of the soil sample to be measured at this time, the corresponding matrix suction of the soil sample can be obtained by calculation.

[0106] It should be noted that after the assembly of the measuring device is completed, the measuring device can be placed in a high-temperature environment of 45°C to accelerate the movement of water molecules in the soil sample and speed up the detection process.

[0107] Further, after step 400, it further includes:

[0108] Step 500, replacing the standard soil sample with different initial saturations, and repeating the measurement of the change of the water content between the standard soil sample and the soil sample to be measured.

[0109] In this embodiment, the standard soil sample in the first sample storage member 210 is replaced with standard soil samples with initial saturations of 0.9θ r , 0.8θ r , 0.7θ r , and the repeated determination of steps 200 to 400 is performed on the standard soil samples with different saturations to obtain the water content data corresponding to the standard soil samples with different saturations.

[0110] It should be noted that, in order to improve the detection efficiency of the moisture content data of the standard soil sample with different saturations and save the determination time, a plurality of soil water characteristic curve measuring devices can be used to measure the data in parallel, and each soil water characteristic curve measuring device measures the moisture content data of a standard soil sample with an initial saturation.

[0111] In step 600, the obtained moisture content data of the standard soil sample and the soil sample to be measured are used to calculate the matric suction of the soil sample to be measured by using the standard sample VG model.

[0112] According to the principle of continuous distribution of liquid pressure, the matric suction of the soil sample to be measured is equal to the matric suction of the standard sample, and the inverse calculation formula of the standard sample VG model is as follows:

[0113]

[0114] In the formula, is the matric suction of the soil sample to be measured, θ measure is the measured moisture content change data of the soil sample to be measured, θ s is the saturated volumetric moisture content of the standard sample, θ r is the residual volumetric moisture content of the standard sample, and α, n and m are the fitting parameters of the VG model.

[0115] It should be noted that when the soil sample to be measured is a dry soil sample and the standard soil sample is a saturated soil sample, the soil sample to be measured is subjected to a moisture absorption process, and the parameters in the above formula should use the standard sample parameters of the standard soil sample in the moisture release path, and the measured matric suction is the matric suction of the moisture absorption process of the soil sample to be measured.

[0116] When the matric suction of the moisture release process of the soil sample to be measured needs to be measured, the standard soil sample in the first sample storage member is replaced with a dry standard soil sample, and the soil sample to be measured in the second sample storage member is replaced with a soil sample to be measured with saturations of 0.9θ r , 0.8θ r , 0.7θ r , etc. The soil sample to be measured with different saturations is repeatedly measured by steps 200 to 400 to obtain the moisture content data corresponding to the soil sample to be measured with different saturations. And using the standard sample parameters of the standard soil sample in the moisture absorption path, the matric suction of the moisture release process of the soil sample to be measured is calculated and obtained.

[0117] In step 700, the measured moisture content change data of the soil sample to be measured and the corresponding matric suction of the standard soil sample are fitted by a self-defined function through software.

[0118] When the soil sample to be measured is a dry soil sample and the standard soil sample is a saturated soil sample, the moisture content change data θ measure of the dry soil sample to be measured and the matric suction of the saturated standard soil sample A custom function was used in the Origin software to fit the VG model parameters θ under the moisture absorption path of the soil sample. s θ r , α, n, m, l.

[0119] When the soil sample to be tested is a saturated soil sample and the standard soil sample is a dry soil sample, the change in water content θ of the saturated soil sample to be tested is... measure Matric suction of dry standard soil samples A custom function was used in the Origin software to fit the VG model parameters θ under the dehydration path of the soil sample. s θ r , α, n, m, l.

[0120] Among them, the water content change data θ of the soil sample to be tested measure Matric suction of standard soil samples The fitting formula is as follows:

[0121]

[0122] In the formula, To indicate the matric suction of the soil sample, θ measure For the moisture content variation data of the soil sample to be tested, θ s θ represents the saturated volumetric water content of the standard sample. r α represents the residual volumetric water content of the standard sample, and α, n, and m are the fitting parameters of the VG model.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A soil water retention curve measuring device based on a standard soil sample method, characterized by, The utility model relates to a soil moisture content testing device, including: Clamping component, including first clamping plate, second clamping plate and connecting component, first clamping plate and second clamping plate are arranged along the predetermined direction interval, and are connected through connecting component; Sample storage component is located between first clamping plate and second clamping plate, and sample storage component includes first sample storage piece and second sample storage piece, first sample storage piece is equipped with first sample storage cavity, and second sample storage piece is equipped with second sample storage cavity, first sample storage piece is used to load standard soil sample, and second sample storage piece is used to load soil sample to be measured, the first end face of first sample storage piece is opposite to the first end face of second sample storage piece, the first end face of first sample storage piece is equipped with first opening, and the first end face of second sample storage piece is equipped with second opening; First clamping plate and second clamping plate are suitable for being close to each other or being far away from each other along the length direction of connecting component, so that the first end face of second sample storage piece is pressed or loosened the first end face of first sample storage piece; Detection component, first sample storage piece, second sample storage piece are connected with detection component, and detection component is used to determine the moisture content variation of standard soil sample and the moisture content variation of soil sample to be measured.

2. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to claim 1, characterized by, First clamping plate is fixedly connected with the first end of connecting component, the second end of first sample storage piece is connected to the side of first clamping plate towards second clamping plate, the second end of second sample storage piece is connected to the side of second clamping plate towards first clamping plate, and second clamping plate is movably connected with the second end of connecting component.

3. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to claim 2, characterized by, The side of first clamping plate towards second clamping plate is provided with mounting groove, and the second end of first sample storage piece is mounted in mounting groove.

4. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to claim 2, characterized by, The utility model also includes: First sealing piece, first sealing piece is suitable for surrounding first end face of first sample storage piece and first end face of second sample storage piece simultaneously.

5. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to claim 1, characterized by, Connecting component includes: Multiple connecting rods, the first end of connecting rod is connected with first clamping plate, and the second end of connecting rod is slidably connected with second clamping plate; Multiple fasteners, each fastener is detachably connected with the second end of corresponding connecting rod one by one, and the fastener is suitable for abutting against the side surface of second clamping plate away from first clamping plate.

6. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to claim 5, characterized by, The side wall of first sample storage piece and the side wall of second sample storage piece abut against connecting rod; Or, the connecting component further includes a support, and the side wall of the first sample storage piece and the side wall of the second sample storage piece are connected to the connecting rod through the support.

7. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to any one of claims 1 to 5, characterized by, The detection component includes a data acquisition instrument, at least two first detection pieces, and at least two second detection pieces, the first detection pieces and the second detection pieces are connected with the data acquisition instrument; The side wall of the first sample storage piece is provided with at least two first detection holes, and each first detection piece is connected with a corresponding first detection hole one by one; The side wall of the second sample storage piece is provided with at least two second detection holes, and each second detection piece is connected with a corresponding second detection hole one by one.

8. The soil water characteristic curve measuring apparatus based on the standard soil sample method according to claim 7, characterized by, One of the first detection holes is arranged at the first end of the first sample storage piece, and the other first detection hole is arranged at the second end of the first sample storage piece. One of the second detection holes is arranged at the first end of the second sample storage member, and the other second detection hole is arranged at the second end of the second sample storage member.

9. A soil water characteristic curve measuring method based on a standard soil sample method, the soil water characteristic curve measuring method being based on the soil water characteristic curve measuring apparatus according to any one of claims 1 to 8, characterized by, The soil soil-water characteristic curve measurement method comprises the following steps: Prepare a standard sample and a test sample, and determine the standard sample parameters of the standard sample; Connect the first clamping plate and the second clamping plate through the connecting assembly, connect the first sample storage member loaded with the standard sample to the first clamping plate, and connect the second sample storage member loaded with the test sample to the second clamping plate; Push the second clamping plate to move towards the first clamping plate, so that the first end face of the second sample storage member is pressed against the first end face of the first sample storage member, and the first sample storage cavity and the second sample storage cavity are communicated; Connect the detection components to the first sample storage member and the second sample storage member respectively to detect the change of the water content of the standard sample and the change of the water content of the test sample.

10. The soil water characteristic curve measurement method based on the standard soil sample method according to claim 9, characterized by, The step of connecting the detection components to the first sample storage member and the second sample storage member respectively to detect the change of the water content of the standard sample and the change of the water content of the test sample comprises: Seal the first detection member to the first detection hole, detect the change of the water content of the standard soil sample through the first detection member, and record the water content data of the standard soil sample; Seal the second detection member to the second detection hole, detect the change of the water content of the test soil sample through the second detection member, and record the water content data of the test soil sample.

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