CN110261254B - In-situ soil parameter measuring instrument and measuring method - Google Patents
In-situ soil parameter measuring instrument and measuring method Download PDFInfo
- Publication number
- CN110261254B CN110261254B CN201910662818.2A CN201910662818A CN110261254B CN 110261254 B CN110261254 B CN 110261254B CN 201910662818 A CN201910662818 A CN 201910662818A CN 110261254 B CN110261254 B CN 110261254B
- Authority
- CN
- China
- Prior art keywords
- pressure sensor
- pressure
- cone
- measuring instrument
- situ soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002689 soil Substances 0.000 title claims abstract description 75
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 6
- 238000011088 calibration curve Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000000691 measurement method Methods 0.000 claims 2
- 238000012360 testing method Methods 0.000 description 8
- 230000035515 penetration Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 241001494479 Pecora Species 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses an in-situ soil parameter measuring instrument and a measuring method, wherein the in-situ soil parameter measuring instrument comprises a cone, a cylindrical connecting rod connected with the cone, a tension pressure sensor arranged at the upper end of the cylindrical connecting rod, an operation handle connected with the upper end of the tension pressure sensor, a sheet-type pressure sensor arranged in the cone, an acquisition system arranged at the upper end of the operation handle and a laser displacement sensor arranged on the operation handle; and the pulling pressure sensor, the sheet pressure sensor and the laser displacement sensor are electrically connected with the acquisition system. The method can accurately and rapidly acquire the data of the change of the soil firmness and the external friction angle of the plough layer along with the measurement depth in the field, and can acquire the data of the true soil firmness and the external friction angle in the field under the condition of not damaging the original structure of the soil.
Description
Technical Field
The invention relates to the technical field of soil parameter measurement, in particular to an in-situ soil parameter measuring instrument and a measuring method.
Background
The physical and mechanical characteristic parameters of the soil influence the operation effect of agricultural machinery, in particular soil touching parts, and because of the large difference of the physical and mechanical characteristic parameters of different types of soil, the flow characteristic of the soil in the operation process is closely related to the parameters such as soil firmness, water content, soil external friction angle and the like. In order to quickly adjust the operation parameters of the machine to adapt to the field soil working conditions such as different soil consistence, soil external friction angle and the like, the soil consistence and external friction angle parameters of different heights in the soil cultivation layer range need to be accurately and quickly obtained. At present, the physical and mechanical characteristic parameter values of soil can be obtained through indoor tests and field tests, but soil samples collected in the indoor test process can influence the internal structure of the soil, so that certain differences exist between test results and field parameters, and the existing field test device is complex and difficult to accurately and rapidly obtain data. Cone devices such as soil firmness meters are the most commonly used and simple test devices for field tests, can quickly obtain soil firmness, but have limited functions and cannot measure other physical and mechanical characteristic parameters of soil.
Disclosure of Invention
The invention aims at overcoming the defects of the technology and provides an in-situ soil parameter measuring instrument and a measuring method for realizing soil firmness and external friction angles of different depths in a soil cultivation layer range.
In order to achieve the above purpose, the in-situ soil parameter measuring instrument designed by the invention comprises a cone, a cylindrical connecting rod connected with the cone, a tension pressure sensor arranged at the upper end of the cylindrical connecting rod, an operation handle connected with the upper end of the tension pressure sensor, a sheet-type pressure sensor arranged in the cone, an acquisition system arranged at the upper end of the operation handle and a laser displacement sensor arranged on the operation handle; and the pulling pressure sensor, the sheet pressure sensor and the laser displacement sensor are electrically connected with the acquisition system.
Further, the acquisition system comprises an STM32F407 singlechip, a power supply module, a power supply conversion module, an LCD display screen, an SD memory card, a tension pressure sensor transmitter and a sheet type pressure sensor conversion circuit, wherein tension pressure signals of the tension pressure sensor are transmitted to the STM32F407 singlechip through the tension pressure sensor transmitter, the sheet type pressure sensor transmits the pressure signals to the STM32F407 singlechip through the sheet type pressure sensor conversion circuit, the laser displacement sensor transmits the displacement signals to the STM32F407 singlechip, and the power supply module supplies power for the tension pressure sensor, the sheet type sensor and the laser displacement sensor, and the power supply module supplies power for the STM32F407 singlechip through the power supply module.
Further, the cone and the cylindrical connecting rod are of hollow structures and are formed by splicing two completely symmetrical half sections, and the sheet type pressure sensor is arranged inside the cone.
The measuring method of the in-situ soil parameter measuring instrument is characterized by comprising the following steps of: the measuring method comprises the following steps:
1) The measuring personnel selects a measuring point, the in-situ soil parameter measuring instrument is vertically placed, the cone naturally contacts the earth surface, in the measuring process, the two hands of the operating personnel hold the two ends of the operating handle, so that the cone uniformly enters the earth on the earth surface vertically, the acquisition system updates acquired data in real time according to data measured by each sensor, the acquired data are displayed on an LCD display screen and synchronously stored in an SD memory card, and after the measuring depth is reached, the data measurement of the measuring point is ended;
2) And D, carrying out digital reset before carrying out data measurement of the next measuring point, and repeating the operation of the step 1) to continuously carry out measurement until all the measuring points are measured.
Further, the in-situ soil parameter measuring instrument is calibrated after being assembled, and the specific process of calibration is as follows:
1) According to rated voltage power supply required by the in-situ soil parameter measuring instrument and the spiral side shaking push-pull force meter, the in-situ soil parameter measuring instrument and the spiral side shaking push-pull force are adjusted to be in a working state;
2) Two conical clamping supports are respectively arranged outside the cones, and the clamping plane parts of the conical clamping supports are parallel to the plane of the sheet-type pressure sensor during installation;
3) Installing an in-situ soil measuring instrument with a conical clamping support on a spiral side shaking pull-push-pull meter, wherein the clamping part of the spiral side shaking pull-push-pull meter is contacted with the clamping surface of the conical clamping support;
4) The shaking handle of the spiral side shaking pull-push meter is shaken to apply pressure to the conical clamping support, the horizontal pressure F2 between two conical half sections of the in-situ soil parameter measuring instrument is recorded once at intervals of preset pressure each time, n times of repeated recording are carried out on each pressure interval, and a data set of the horizontal pressure F2 between two conical half sections measured by n groups of preset pressure at intervals is obtained;
5) Repeatedly recording the results of n times at each pressure interval, taking the average value to obtain an average horizontal pressure F2' data set after taking the average value of each measuring point at a group of different pressure intervals, and adopting least square fitting to obtain a calibration curve F2' =KX+B of an average horizontal pressure value F2' between two half sections of the cone, wherein X is a preset interval pressure value, and K, B is a correction coefficient;
6) And K, B is substituted into a compensation conversion formula F2 "=KF2+B of the horizontal pressure F2 between two conical half sections, wherein F2 is a measured value, F2" is a calibrated correction value, and the calibration operation of the horizontal pressure F2 can be completed.
Compared with the prior art, the invention has the following advantages:
1. the in-situ soil parameter measuring instrument can accurately and rapidly acquire the data of the change of the soil firmness and the external friction angle of the plough layer along with the measuring depth in the field, and can acquire the data of the real soil firmness and the external friction angle in the field under the condition of not damaging the original structure of the soil;
2. the invention adopts structural design, the measuring device is convenient to mount and dismount, is convenient for carrying in field measurement, has simple operation process, and does not need to operate complicated measuring instruments like indoor tests.
Drawings
FIG. 1 is a schematic structural diagram of an in-situ soil parameter measuring instrument of the present invention;
FIG. 2 is a schematic view of the half cone structure of FIG. 1;
FIG. 3 is a graph of the cone force diagram in each direction;
FIG. 4 is a conical clamping support;
FIG. 5 is a schematic circuit diagram of the acquisition system of FIG. 1;
FIG. 6 is a calibration graph.
In the figure: cone 1, cylinder connecting rod 2, draw pressure sensor 3, mount pad 4, laser displacement sensor 5, aviation plug 6, acquisition system 7, sheep horn screw 8, operating handle 9, thin slice pressure sensor 10, sensor circuit 11, cone clamping support 12.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
The in-situ soil parameter measuring instrument as shown in fig. 1 and 2 comprises a cone 1, a cylindrical connecting rod 2 connected with the cone 1, a tension pressure sensor 3 arranged at the upper end of the cylindrical connecting rod 2, an operation handle 9 connected with the upper end of the tension pressure sensor 3, an acquisition system 7 arranged at the upper end of the operation handle 9 and a laser displacement sensor 5 arranged on the operation handle 9. The laser displacement sensor 5 is connected with the side edge of the operating handle 9 through the mounting support 4; the cone 1 and the cylindrical connecting rod 2 are of hollow structures, the cone 1 and the cylindrical connecting rod 2 are formed by splicing two completely symmetrical half sections, a sheet type pressure sensor 10 is mounted in the cone 1, the cylindrical connecting rod 2 is hollow, a sheet type pressure sensor circuit 11 is used for being arranged, the tension pressure sensor circuit, the laser displacement sensor circuit and the sheet type pressure sensor circuit 11 are all connected with the acquisition system 7 through the aviation plug 6, and the acquisition system 7 is connected with the operation handle 9 through the claw screw 8. In the embodiment, the model of the sheet type pressure sensor is Flexiface, the model of the pull pressure sensor is DYMH-103 5000kg, and the model of the laser displacement sensor is HG-C1400.
Referring to fig. 5, the acquisition system includes an STM32F407 singlechip, a 12V power module, a 12V-to-5V power conversion module, an LCD display screen, an SD memory card, a pull pressure sensor transducer and a sheet-type pressure sensor conversion circuit, wherein a pull pressure signal of the pull pressure sensor is transmitted to the STM32F407 singlechip through the pull pressure sensor transducer, the sheet-type pressure sensor transmits a pressure signal to the STM32F407 singlechip through the sheet-type pressure sensor conversion circuit, the laser displacement sensor transmits a displacement signal to the STM32F407 singlechip, the 12V power module supplies power to the pull pressure sensor, the sheet-type sensor and the laser displacement sensor, and the 12V power module supplies power to the STM32F407 singlechip through the 12V-to-5V power module.
In addition, the LCD display screen is used for displaying soil firmness and external friction angle parameters at different depths, wherein the parameters comprise a curve chart of the soil firmness along with the measured depth, a curve chart of the soil external friction angle along with the measured depth, real-time data of the soil firmness, real-time data of the soil external friction angle and real-time data of the measured depth. The depth resolution of measurement was 2mm, i.e. the measured data of soil solidity and soil external friction angle were updated once at 2mm intervals.
Referring to fig. 3, the principle of measuring soil firmness and external friction angle parameters by the in-situ soil parameter measuring instrument of the invention is as follows:
the sheet sensor measures the horizontal pressure F2 between two half sections of the cone, and the unit is N;
the tension and pressure sensor measures cone earth penetration resistance F1, and the unit is N;
the laser displacement sensor measures cone earth-entering displacement D, and the unit is mm;
the soil firmness calculation formula is: p=f 1 S, wherein F1 is cone penetration resistance; s is the conical base area, radius r=15 mm.
The calculation formula of the soil external friction angle is as follows: phi = arctan (f/N), whereF2 is the horizontal pressure between two half sections of the cone; θ is the apex angle of the cone, the cone soil penetration resistance F1, the horizontal pressure F2 between two half sections of the cone and the soil penetration distance D are obtained, and the soil firmness and the soil friction coefficient of different depths can be obtained, and the stress directions are shown in figure 3.
The calibration steps of the in-situ soil parameter measuring instrument are as follows:
1) According to rated voltage power supply required by the in-situ soil parameter measuring instrument and the spiral side shaking push-pull force meter, the in-situ soil parameter measuring instrument and the spiral side shaking push-pull force are adjusted to be in a working state;
2) The two conical clamping supports are respectively arranged outside the cones, and the clamping plane part of the conical clamping support 12 (shown in fig. 4) is parallel to the plane of the sheet-type pressure sensor when the two conical clamping supports are arranged;
3) Installing an in-situ soil measuring instrument with a conical clamping support on a spiral side shaking pull-push-pull meter, wherein the clamping part of the spiral side shaking pull-push-pull meter is contacted with the clamping surface of the conical clamping support;
4) The shaking handle of the spiral side shaking pull-push meter is shaken to apply pressure to the conical clamping support, the horizontal pressure F2 between two conical half sections of the in-situ soil parameter measuring instrument is recorded once at intervals of preset pressure (for example, 10N), N (for example, 5) times are repeatedly recorded at intervals of each pressure, and N groups of horizontal pressure F2 data sets between two conical half sections measured at intervals of preset pressure are obtained;
5) Repeatedly recording the results of n times at each pressure interval, taking the average value to obtain an average horizontal pressure F2' data set after taking the average value of each measuring point at a group of different pressure intervals, and adopting least square fitting to obtain a calibration curve F2' =KX+B of an average horizontal pressure value F2' between two half sections of the cone, wherein X is a preset interval pressure value, and K, B is a correction coefficient;
6) And K, B is substituted into a compensation conversion formula F2 "=KF2+B of the horizontal pressure F2 between two conical half sections, wherein F2 is a measured value, F2" is a calibrated correction value, and the calibration operation of the horizontal pressure F2 can be completed.
Because the cone penetration resistance F1 is not interfered by the design of the device, the measured value of the pulling pressure sensor is the accurate cone penetration resistance value, and therefore, the F1 does not need to be calibrated.
The working process of the in-situ soil parameter measuring instrument is as follows:
1) The measuring personnel selects a measuring point, the in-situ soil parameter measuring instrument is vertically placed, the cone naturally contacts the earth surface, in the measuring process, the two hands of the operating personnel hold the two ends of the operating handle, so that the cone uniformly enters the earth on the earth surface vertically, the acquisition system updates acquired data in real time according to data measured by each sensor, the acquired data are displayed on an LCD display screen and synchronously stored in an SD memory card, and after the measuring depth is reached, the data measurement of the measuring point is ended;
2) And D, carrying out digital reset before carrying out data measurement of the next measuring point, and repeating the operation of the step 1) to continuously carry out measurement until all the measuring points are measured.
Claims (3)
1. The measuring method based on the in-situ soil parameter measuring instrument is characterized by comprising the following steps of: the in-situ soil parameter measuring instrument comprises a cone, a cylindrical connecting rod connected with the cone, a tension pressure sensor arranged at the upper end of the cylindrical connecting rod, an operation handle connected with the upper end of the tension pressure sensor, a sheet-type pressure sensor arranged in the cone, an acquisition system arranged at the upper end of the operation handle and a laser displacement sensor arranged on the operation handle; the pulling pressure sensor, the sheet pressure sensor and the laser displacement sensor are electrically connected with the acquisition system;
the measuring method comprises the following steps:
1) The measuring personnel selects a measuring point, the in-situ soil parameter measuring instrument is vertically placed, the cone naturally contacts the earth surface, in the measuring process, the two hands of the operating personnel hold the two ends of the operating handle, so that the cone uniformly enters the earth on the earth surface vertically, the acquisition system updates acquired data in real time according to data measured by each sensor, the acquired data are displayed on an LCD display screen and synchronously stored in an SD memory card, and after the measuring depth is reached, the data measurement of the measuring point is ended;
2) Carrying out digital reset before carrying out data measurement of the next measuring point, and repeating the operation of the step 1) to continuously carry out measurement until all measuring points are measured;
the in-situ soil parameter measuring instrument is calibrated after being assembled, and the specific process of calibration is as follows:
1) According to rated voltage power supply required by the in-situ soil parameter measuring instrument and the spiral side shaking push-pull force meter, the in-situ soil parameter measuring instrument and the spiral side shaking push-pull force are adjusted to be in a working state;
2) Two conical clamping supports are respectively arranged outside the cones, and the clamping plane parts of the conical clamping supports are parallel to the plane of the sheet-type pressure sensor during installation;
3) Installing an in-situ soil measuring instrument with a conical clamping support on a spiral side shaking pull-push-pull meter, wherein the clamping part of the spiral side shaking pull-push-pull meter is contacted with the clamping surface of the conical clamping support;
4) The shaking handle of the spiral side shaking pull-push meter is shaken to apply pressure to the conical clamping support, the horizontal pressure F2 between two conical half sections of the in-situ soil parameter measuring instrument is recorded once at intervals of preset pressure each time, n times of repeated recording are carried out on each pressure interval, and a data set of the horizontal pressure F2 between two conical half sections measured by n groups of preset pressure at intervals is obtained;
5) Repeatedly recording the results of n times at each pressure interval, taking the average value to obtain an average horizontal pressure F2' data set after taking the average value of each measuring point at a group of different pressure intervals, and adopting least square fitting to obtain a calibration curve F2' =KX+B of an average horizontal pressure value F2' between two half sections of the cone, wherein X is a preset interval pressure value, and K, B is a correction coefficient;
6) And K, B is substituted into a compensation conversion formula F2 "=KF2+B of the horizontal pressure F2 between two conical half sections, wherein F2 is a measured value, F2" is a calibrated correction value, and the calibration operation of the horizontal pressure F2 can be completed.
2. The measurement method based on the in-situ soil parameter measuring instrument according to claim 1, wherein: the acquisition system comprises an STM32F407 singlechip, a power supply module, a power supply conversion module, an LCD display screen, an SD memory card, a tension pressure sensor transmitter and a sheet type pressure sensor conversion circuit, wherein tension pressure signals of the tension pressure sensor are transmitted to the STM32F407 singlechip through the tension pressure sensor transmitter, the sheet type pressure sensor transmits the pressure signals to the STM32F407 singlechip through the sheet type pressure sensor conversion circuit, the laser displacement sensor transmits displacement signals to the STM32F407 singlechip, and the power supply module supplies power for the tension pressure sensor, the sheet type sensor and the laser displacement sensor, and the power supply module supplies power for the STM32F407 singlechip through the power supply module.
3. The measurement method based on the in-situ soil parameter measuring instrument according to claim 1, wherein: the cone and the cylindrical connecting rod are of hollow structures and are formed by splicing two completely symmetrical half sections, and the sheet type pressure sensor is arranged inside the cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910662818.2A CN110261254B (en) | 2019-07-22 | 2019-07-22 | In-situ soil parameter measuring instrument and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910662818.2A CN110261254B (en) | 2019-07-22 | 2019-07-22 | In-situ soil parameter measuring instrument and measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110261254A CN110261254A (en) | 2019-09-20 |
| CN110261254B true CN110261254B (en) | 2024-04-09 |
Family
ID=67927513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910662818.2A Active CN110261254B (en) | 2019-07-22 | 2019-07-22 | In-situ soil parameter measuring instrument and measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110261254B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384230A (en) * | 2021-12-14 | 2022-04-22 | 华中农业大学 | Farmland soil parameter measuring trolley |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109439A (en) * | 2011-03-01 | 2011-06-29 | 北京航空航天大学 | Instrument for measuring bearing and shearing properties of soil |
| CN202814856U (en) * | 2012-07-25 | 2013-03-20 | 北京市轨道交通建设管理有限公司 | Experimental equipment for simulating friction coefficient of spiral unearthing device of earth pressure balance shield |
| CN103115832A (en) * | 2013-01-25 | 2013-05-22 | 北京航空航天大学 | Tester for soil pressure bearing and shearing test |
| CN106980013A (en) * | 2017-06-01 | 2017-07-25 | 中国人民解放军军事交通学院 | Soil surveying experimental rig Measurement and Control System |
| CN108507878A (en) * | 2018-05-31 | 2018-09-07 | 中铁建设集团有限公司 | A kind of soil pressure simulating test device and method |
| WO2019109633A1 (en) * | 2017-12-04 | 2019-06-13 | 深圳大学 | Method and symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength |
| CN210243410U (en) * | 2019-07-22 | 2020-04-03 | 华中农业大学 | Soil firmness and external friction angle measuring device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU138425U1 (en) * | 2012-04-16 | 2014-03-20 | Открытое акционерное общество "Курганавторемонт" | DRILLING CUTTING BIT |
-
2019
- 2019-07-22 CN CN201910662818.2A patent/CN110261254B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109439A (en) * | 2011-03-01 | 2011-06-29 | 北京航空航天大学 | Instrument for measuring bearing and shearing properties of soil |
| CN202814856U (en) * | 2012-07-25 | 2013-03-20 | 北京市轨道交通建设管理有限公司 | Experimental equipment for simulating friction coefficient of spiral unearthing device of earth pressure balance shield |
| CN103115832A (en) * | 2013-01-25 | 2013-05-22 | 北京航空航天大学 | Tester for soil pressure bearing and shearing test |
| CN106980013A (en) * | 2017-06-01 | 2017-07-25 | 中国人民解放军军事交通学院 | Soil surveying experimental rig Measurement and Control System |
| WO2019109633A1 (en) * | 2017-12-04 | 2019-06-13 | 深圳大学 | Method and symmetrical direct shear apparatus for in-situ testing of pile-soil interface shear strength |
| CN108507878A (en) * | 2018-05-31 | 2018-09-07 | 中铁建设集团有限公司 | A kind of soil pressure simulating test device and method |
| CN210243410U (en) * | 2019-07-22 | 2020-04-03 | 华中农业大学 | Soil firmness and external friction angle measuring device |
Non-Patent Citations (5)
| Title |
|---|
| 一种土壤剖面水分与坚实度同步测量装置;朱兆龙;孙宇瑞;马道坤;胡永光;曾庆猛;;江苏大学学报(自然科学版)(第04期);280-283 * |
| 农田土壤含水率与坚实度快速信息采集系统;邵玲;林剑辉;孙宇瑞;;农机化研究(第02期);83-86 * |
| 基于嵌入式力学传感器的圆锥指数仪设计与试验;孟繁佳;孙宇瑞;王聪颖;林剑辉;;农业机械学报(第01期);80-84 * |
| 采动区墙体转动模式下非极限被动土压力试验研究;谢晓鹏;窦国涛;曹正浩;于文杰;;科学技术与工程(第25期);全文 * |
| 静压桩桩-土界面滑动摩擦机制研究;胡永强;汤连生;李兆源;;岩土力学(第05期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110261254A (en) | 2019-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210243410U (en) | Soil firmness and external friction angle measuring device | |
| CN108593883A (en) | A kind of strain-type lateral expansion force test device and measurement method | |
| CN110487909B (en) | Non-invasive soil moisture sound wave detection device and method | |
| CN110261254B (en) | In-situ soil parameter measuring instrument and measuring method | |
| CN203117060U (en) | Stratometer | |
| CN202281723U (en) | Portable crop lodging-resistant strength electronic determinator | |
| CN106124291B (en) | A kind of device and method of continuous measurement deformation of thin membrane | |
| CN110849314B (en) | Dynamic strain calibration method with continuously adjustable frequency | |
| CN104849143A (en) | Uniaxial tension device and testing method thereof | |
| CN110686798A (en) | Device and method for testing surface temperature uniformity of bottom plate of wind tunnel test section | |
| CN107218884B (en) | Drilling strain gauge complete machine performance testing device and testing method | |
| CN202809591U (en) | Static cone penetration system | |
| CN206002194U (en) | A kind of hydrophone sensitivity temperature response measuring device and system | |
| CN110672263A (en) | Shock wave pressure sensor field calibration device and method | |
| CN210180515U (en) | Measuring device for wave profile | |
| CN110657928B (en) | Method for rapidly measuring bending stiffness of optical flat glass | |
| CN207148099U (en) | Automatically determine retractometer | |
| CN207163810U (en) | A kind of bending method based on amesdial surveys Experiment of Measuring Young's device | |
| CN102735397B (en) | Device for calibrating pull pressure gauge | |
| CN218916604U (en) | Temperature calibration device of push type impact sample low-temperature instrument | |
| CN110609130A (en) | Pull formula soil profile moisture sensor | |
| CN219776645U (en) | Coarseness and length measuring device used in corn breeding process | |
| CN110702879B (en) | Device and method for measuring disturbance range of soil body after sampling | |
| CN117346679B (en) | Device and method for calibrating covariant condition of optical fiber and soil body | |
| CN221124178U (en) | Quality and height measuring device for undisturbed soil shrinkage test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |