One-dimensional soil column multi-point deformation monitoring and unsaturated permeability coefficient measuring device

Abstract

The utility model belongs to the technical field of geotechnical engineering data measuring equipment, and particularly relates to a one-dimensional soil column multi-point deformation monitoring and unsaturated permeability coefficient measuring device which comprises a soil column sample chamber, the soil column sample chamber is installed on a supporting structure, and monitoring systems are located on the two sides of the soil column sample chamber. The water supply system and the drainage system are located at the upper end and the lower end of the soil column sample chamber respectively, the loading system is located at the top of the supporting structure and acts on the upper portion of the soil column sample chamber, and the data acquisition system is connected with the loading system, the water supply system, the drainage system and the monitoring system; the water supply system and the drainage system are matched to detect the permeability and the dynamic change of the expansibility of the soil body in the permeation process of the expansive soil, meanwhile, the monitoring system is used for detecting the deformation conditions of different depth positions in the soil column, and then the data acquisition system is used for real-time detection and recording. The experimental efficiency is high, the result observation is obvious and accurate, and the manufacturing cost is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geotechnical engineering data measuring equipment technical field, concretely relates to one -dimensional soil column multi -point position deformation monitoring and unsaturated permeability coefficient measuring device. BACKGROUND

[0002] The permeability and expansibility of the soil body in the permeation process of the expansive soil will produce dynamic change, therefore, researches the expansive change and water migration of the soil body in the permeation process, and explores the critical expansive depth of the soil body, and it is particularly important for predicting the moisture content change and expansive potential of actual engineering.

[0003] The traditional soil column unsaturated permeation test can only obtain the overall deformation of the top of the soil column, and the deformation of different depth positions in the soil column is difficult to measure, the relationship between the deformation of the key points of the soil column surface and the initial state of the soil body cannot be established, and the permeation-expansion law and wet expansion phenomenon of the expansive soil cannot be observed and analyzed in detail. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of one-dimensional soil column multi-point position deformation monitoring and unsaturated permeability coefficient measuring device, the device can realize simulation unsaturated permeation test of expansive soil body in one-dimensional state, and permeability coefficient and deformation law of soil sample in humidification process can be measured.

[0005] In order to achieve the above purpose, the utility model takes the technical scheme that:

[0006] A one-dimensional soil column multi-point position deformation monitoring and unsaturated permeability coefficient measuring device, including soil column sample room, support structure, loading system, water supply system, drainage system, monitoring system and data acquisition system, the soil column sample room is installed on the support structure, the monitoring system is located at the two sides of soil column sample room, the water supply system and drainage system are located at the upper end and lower end of soil column sample room respectively, the loading system is located at the top of support structure, the loading system acts on the upper of soil column sample room, the data acquisition system is connected with loading system, water supply system, drainage system and monitoring system;

[0007] The soil column sample room includes organic glass barrel, the soil column is equipped in the organic glass barrel, a plurality of targets are sequentially arranged on the soil column, water sensors are arranged on the two sides of the soil column, filter paper and water permeable stone are sequentially arranged on the top and bottom of the soil column respectively, a water accumulation area is arranged between the water permeable stone on the top of the soil column and the top of the organic glass barrel, a water permeable bottom plate is arranged below the water permeable stone at the bottom of the soil column, the water permeable bottom plate is provided with a drainage port, and the organic glass barrel and the water permeable bottom plate are made of acrylic material.

[0008] Preferably, the support structure comprises four support rods, the top of the four support rods is provided with a top plate, a plurality of dial gauges are arranged below the top plate, the dial gauges are arranged on the dial gauge supports, the measuring heads of the dial gauges are arranged on the upper surface of the water-permeable stone at the top of the soil column, the bottom of the four support rods is provided with a base, the base is arranged on the base support, and the base, the top plate, the support rods and the base support are made of stainless steel.

[0009] Preferably, the loading system comprises a pneumatic pressure device, the pneumatic pressure device is arranged below the top plate of the support structure, a connecting rod is arranged below the pneumatic pressure device, a pressure sensor is arranged between the pneumatic pressure device and the connecting rod, a loading base is arranged below the connecting rod, the loading base is arranged above the water-permeable stone at the top of the soil column, the connecting rod acts on the loading base, and the connecting rod and the loading base are made of stainless steel.

[0010] Preferably, the water supply system comprises a water supply device, a pedestal is arranged below the water supply device, a weighing sensor is arranged between the pedestal and the water supply device, a water inlet pipe is arranged on one side of the water supply device, the other end of the water inlet pipe is connected with a water accumulation area at the top of the soil column, a water inlet control valve is arranged on the water inlet pipe, the pedestal below the water supply device is movably arranged on the adjacent two support frames, and the water supply device is a mason jar.

[0011] Preferably, the water supply system comprises a water supply device, a pedestal is arranged below the water supply device, a weighing sensor is arranged between the pedestal and the water supply device, a water inlet pipe is arranged on one side of the water supply device, the other end of the water inlet pipe is connected with a water accumulation area at the top of the soil column, a water inlet control valve is arranged on the water inlet pipe, the pedestal below the water supply device is movably arranged on the adjacent two support frames, and the water supply device is a mason jar.

[0012] Preferably, the monitoring system comprises a monitoring camera, the monitoring camera is arranged on a movable support, a height adjuster is arranged on the movable support, and the monitoring camera acts on the target on the soil column.

[0013] Preferably, the data acquisition system comprises a multifunctional data acquisition instrument, the multifunctional data acquisition instrument is signal-connected with the water content sensor, the dial gauge, the pressure sensor and the weighing sensor, a PC is arranged on the multifunctional data acquisition instrument, and the PC is used for data display and storage.

[0014] Preferably, the loading base is in a circular structure, the center of the loading base is a base center, the periphery of the loading base is a base outer ring, a plurality of base supports are arranged between the base center and the base outer ring, and the connecting rod acts on the base center.

[0015] The utility model discloses beneficial effects are:

[0016] The utility model discloses a soil column is installed in the plexiglass bucket, and then filter paper and water-permeable stone are set at both ends, utilizes the cooperation between water supply system and drainage system to detect the dynamic change of the permeability and swelling of soil in the seepage process of expansive soil, utilizes the deformation of the inside different depth position of soil column of monitoring system to detect again, utilizes data acquisition system real -time detection record, and the penetration-swelling rule and wet swelling phenomenon of expansive soil are observed and analyzed in detail, and the utility model discloses simple structure, and experimental efficiency is high, and the result observation is obvious and high accuracy, and the manufacturing cost is low.

[0017] (2) The loading base in the utility model is of circular structure, and the outer ring of the base around the center of the base is connected with the base support, so that the force is evenly transmitted and the water is evenly infiltrated.

[0018] (3) The monitoring of the deformation of the soil column is realized by the monitoring system, which sets the monitoring camera on the target of the corresponding monitoring point of the soil column by using the movable support and the height adjuster. The camera can adjust the left and right positions by the movable support and the height by the height adjuster, so that the deformation of the soil column at different positions can be detected by the camera in one step. When the soil column is infiltrated, the development rule of the deformation of the soil column at different depths with the infiltration time can be obtained by the digital close-range photography technology of the monitoring camera, and the correlation between the deformation of the key points on the surface of the soil column and the initial state of the soil body is established. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of the utility model;

[0020] Figure 2 It is the structural schematic diagram of the loading base;

[0021] Figure 3 It is the deformation analysis flow chart;

[0022] In the drawing: 1, plexiglass bucket; 2, water-permeable bottom plate; 3, target; 4, base; 5, soil column; 6, moisture sensor; 7, water-permeable stone; 8, connecting rod; 9, dial gauge; 10, pressure sensor; 11, dial gauge support; 12, pneumatic pressure device; 13, top plate; 14, support rod; 15, water supply device; 16, weighing sensor; 17, drainage device; 18, pedestal; 19, monitoring camera; 20, movable support; 21, water inlet pipe; 22, drainage pipe; 23, base support; 24, water inlet control valve; 25, drainage control valve; 26, height adjuster; 27, multifunctional data acquisition instrument; 28, PC; 29, filter paper; 30, loading base; 31, base center; 32, base frame; 33, base outer ring. DETAILED DESCRIPTION

[0023] The utility model will be further described below in combination with the drawings, specific embodiments and analysis principles:

[0024] As Figure 1 And 2 A one-dimensional soil column multi-point deformation monitoring and unsaturated permeability coefficient measuring device shown in the figure, including soil column sample room, support structure, loading system, water supply system, drainage system, monitoring system and data acquisition system, soil column sample room is installed on the support structure, monitoring system is located at the both sides of soil column sample room, water supply system and drainage system are located at the upper end and the lower end of soil column sample room respectively, loading system is located at the top of support structure, loading system acts on the upper of soil column sample room, data acquisition system is connected with loading system, water supply system, drainage system and monitoring system.

[0025] Soil column sample room includes organic glass barrel 1, organic glass barrel 1 is equipped with soil column 5, soil column 5 is equipped with a plurality of targets 3 in sequence, the both sides of soil column 5 are equipped with moisture sensors 6, and the moisture sensors 6 are provided with multiple from high to low from soil column 5, so as to detect the moisture of soil column at different depths, the top and bottom of soil column 5 are equipped with filter paper 29 and water-permeable stone 7 in sequence respectively, the water-permeable stone 7 at the top of soil column 5 is provided with a water accumulation area to the top of organic glass barrel 1, the water-permeable stone 7 at the bottom of soil column 5 is provided with a water-permeable bottom plate 2 below, the water-permeable bottom plate 2 is provided with a drainage port, and the organic glass barrel 1 and the water-permeable bottom plate 2 are made of acrylic material.

[0026] The support structure includes four support rods 14, the top of the four support rods 14 is provided with a top plate 13, a plurality of dial gauge supports 11 are provided below the top plate 13, a dial gauge 9 is provided on the dial gauge support 11, the measuring head of the dial gauge 9 acts on the upper surface of the water-permeable stone 7 at the top of soil column 5, the bottom of the four support rods 14 is provided with a base 4, the bottom of the base 4 is provided with a base support 23, the base 4, the top plate 13, the support rod 14 and the base support 23 are made of stainless steel, and the components between the support structures are connected and fixed through bolts, so that the device can be disassembled and installed.

[0027] The loading system comprises a pneumatic pressurizing device 12, which is installed below the top plate 13 of the support structure, and a connecting rod 8 below the pneumatic pressurizing device 12, and a pressure sensor 10 between the pneumatic pressurizing device 12 and the connecting rod 8, and a loading base 30 below the connecting rod 8, which is located above the permeable stone 7 at the top of the soil column 5, and the connecting rod 8 acts on the loading base 30, and the connecting rod 8 and the loading base 30 are made of stainless steel which is not easy to corrode, and the loading base 30 is of a circular structure, so that the force is evenly transmitted and the water is evenly infiltrated, and the center of the loading base 30 is a base center 31, and the periphery of the loading base 30 is a base outer ring 33, and a plurality of base frames 32 are arranged between the base center 31 and the base outer ring 33, and the connecting rod 8 acts on the base center 31.

[0028] The water supply system comprises a water supply device 15, and a pedestal 18 below the water supply device 15, and a weighing sensor 16 between the pedestal 18 and the water supply device 15, which is used to detect the water amount in the water supply device in real time, and a water inlet pipe 21 on one side of the water supply device 15, and the other end of the water inlet pipe 21 is connected to the water accumulation area at the top of the soil column 5, and a water inlet control valve 24 is arranged on the water inlet pipe 21, which is used to control the water inlet of the water inlet pipe 21, and the pedestal 18 below the water supply device 15 is movably installed on the adjacent two support frames 14, so as to adjust the height of the water supply device 15 at will, so as to control the depth of the water amount in the water accumulation area, and the water supply device 15 is a marshall bottle.

[0029] The drainage system comprises a drainage device 17, and a pedestal 18 below the drainage device 17, and a weighing sensor 16 between the drainage device 17 and the pedestal 18, which is used to measure the water amount collected by the drainage device 17, and a drainage pipe 22 on one side of the drainage device 17, and the other end of the drainage pipe 22 is connected to the drainage port of the permeable bottom plate 2, and a drainage control valve 25 is arranged on the drainage pipe 22, which is used to control the water flow in the drainage pipe 22 of the drainage device 17, and the pedestal 18 below the drainage device 17 is placed on the ground.

[0030] The monitoring system comprises a monitoring camera 19, which is installed on a movable support 20, and a height adjuster 26 is arranged on the movable support 20, and the monitoring camera 19 acts on the target 3 on the soil column 5.

[0031] The data acquisition system comprises a multifunctional data acquisition instrument 27, which is connected with the moisture sensor 6, the dial indicator 9, the pressure sensor 10 and the weighing sensor 16, and is used to acquire the detection data on the moisture sensor 6, the dial indicator 9, the pressure sensor 10 and the weighing sensor 16, and a PC 28 is arranged on the multifunctional data acquisition instrument 27, which is used to display and store the data.

[0032] The monitoring of the deformation inside the soil column 5 is mainly realized by a monitoring system, which adopts a digital close-range photogrammetry system (DPS) and mainly consists of a monitoring camera 19, a movable support 20, a height adjuster 26 and a target 3. The data detected by the monitoring system are transmitted to a data acquisition system through signal connection transmission, and the monitoring deformation analysis in the monitoring digital image includes: optimal mark surface selection, image acquisition and target fitting, structural feature point information extraction and displacement calculation.

[0033] The unsaturated permeability coefficient of the soil column 5 is mainly monitored and collected by the pre-embedded water sensor 6 and is obtained through the transient profile method. The transient profile method is to measure the time and space profile of the water content of each section under the seepage state of the one-dimensional soil column, to perform the difference of the soil columns at different sections, and to obtain the unsaturated permeability coefficient through calculation.

[0034] A method for using a one-dimensional soil column multi-point displacement monitoring and unsaturated permeability coefficient measuring device, comprising the following steps:

[0035] A. The soil bodies with a certain water content are layered and compacted into the soil column 5 in the organic glass barrel 1, the filter paper 29 and the water permeable stone 7 are arranged above and below the soil column 5, and the water sensor 6 and the target 3 are embedded at a certain height of the soil column 5;

[0036] B. The loading base 30 is installed above the water permeable stone 7 of the prepared soil column 5, the pneumatic pressurizing device 12 and the connecting rod 8 are installed below the top plate 13 of the support structure, the connecting rod 8 acts on the loading base 30, and the dial gauge 9 is installed below the top plate 13 by using the dial gauge support 11, and the dial gauge acts on the water permeable stone 7 above the soil column 5;

[0037] C. The pressure sensor 10 is installed between the connecting rod 8 and the pneumatic pressurizing device 12 placed above the loading base 30, and the pneumatic pressurizing device 12 is adjusted to apply different target overburden loads to the soil column 5.

[0038] D. The monitoring camera 19 is turned on to perform optimal mark surface selection and target fitting on the target 3 inside the soil column 5;

[0039] E. The position of the pedestal 18 below the water supply device 15 is adjusted to determine the water depth of the water accumulation area, the water inlet control valve 24 and the drainage control valve 25 are opened, and the one-dimensional unsaturated permeability test is carried out.

[0040] F. At the same time when the infiltration test starts, the multifunctional data acquisition instrument 27 in the data acquisition system is turned on to display and collect the data of the water sensor 6, the dial gauge 9, the pressure sensor 10 and the weighing sensor 16.

[0041] G, the data of moisture sensor 6 is calculated by using transient profile method to establish the correlation between the deformation of key points on the surface of soil column 5 and the initial state of soil.

Claims

1. A one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measurement device, characterized in that: The application relates to a soil column sample test device, which comprises a soil column sample chamber, a supporting structure, a loading system, a water supply system, a drainage system, a monitoring system and a data acquisition system. The soil column sample chamber comprises a plexiglass barrel (1), a soil column (5) arranged in the plexiglass barrel (1), a plurality of targets (3) arranged on the soil column (5) in sequence, water content sensors (6) arranged on the two sides of the soil column (5), filter paper (29) and water permeable stones (7) arranged on the top and bottom of the soil column (5) in sequence, a water accumulation area arranged between the water permeable stone (7) on the top of the soil column (5) and the top of the plexiglass barrel (1), a water permeable bottom plate (2) arranged below the water permeable stone (7) on the bottom of the soil column (5), a drainage port arranged on the water permeable bottom plate (2), and the plexiglass barrel (1) and the water permeable bottom plate (2) being made of acrylic material. 2.The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 1, characterized in that: The supporting structure comprises four supporting rods (14), a top plate (13) arranged on the top of the four supporting rods (14), a plurality of dial indicator supports (11) arranged below the top plate (13), dial indicators (9) arranged on the dial indicator supports (11), measuring heads of the dial indicators (9) acting on the upper surfaces of the water permeable stones (7) on the top of the soil column (5), a base (4) arranged on the bottom of the four supporting rods (14), a base support (23) arranged below the base (4), and the base (4), the top plate (13), the supporting rods (14) and the base support (23) being made of stainless steel. 3.The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 1, characterized in that: The loading system comprises a pneumatic pressure device (12) arranged below the top plate (13) of the supporting structure, a connecting rod (8) arranged below the pneumatic pressure device (12), a pressure sensor (10) arranged between the pneumatic pressure device (12) and the connecting rod (8), a loading base (30) arranged below the connecting rod (8), the loading base (30) being arranged above the water permeable stone (7) on the top of the soil column (5), the connecting rod (8) acting on the loading base (30), and the connecting rod (8) and the loading base (30) being made of stainless steel which is not easy to be corroded.

4. The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 1, characterized in that: The water supply system comprises a water supply device (15), a pedestal (18) arranged below the water supply device (15), a weighing sensor (16) arranged between the pedestal (18) and the water supply device (15), a water inlet pipe (21) arranged on one side of the water supply device (15), the other end of the water inlet pipe (21) being connected with the water accumulation area on the top of the soil column (5), a water inlet control valve (24) arranged on the water inlet pipe (21), the pedestal (18) below the water supply device (15) being movably arranged on the adjacent two supporting rods (14), and the water supply device (15) being a marshall bottle.

5. The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 1, characterized in that: The drainage system comprises a drainage device (17), a pedestal (18) is arranged below the drainage device (17), a load sensor (16) is arranged between the drainage device (17) and the pedestal (18), a drainage pipe (22) is arranged on one side of the drainage device (17), the other end of the drainage pipe (22) is connected with a drainage port of the water-permeable bottom plate (2), a drainage control valve (25) is arranged on the drainage pipe (22), and the pedestal (18) below the drainage device (17) is placed on the ground. 6.The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 1, characterized in that: The monitoring system comprises a monitoring camera (19), the monitoring camera (19) is installed on a movable support (20), a height adjuster (26) is arranged on the movable support (20), and the monitoring camera (19) acts on a target (3) on the soil column (5).

7. The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 1, characterized in that: The data acquisition system comprises a multifunctional data acquisition instrument (27), the multifunctional data acquisition instrument (27) is signal-connected with the moisture sensor (6), the dial indicator (9), the pressure sensor (10) and the load sensor (16), a PC (28) is arranged on the multifunctional data acquisition instrument (27), and the PC (28) is used for displaying and storing data.

8. The one-dimensional soil column multi-point deformation monitoring and unsaturated hydraulic conductivity measuring device according to claim 3, characterized in that: The loading base (30) is a circular structure, a base center (31) is arranged at the center position of the loading base (30), a base outer ring (33) is arranged around the loading base (30), a plurality of base frames (32) are arranged between the base center (31) and the base outer ring (33), and the connecting rod member (8) acts on the base center (31).

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