CN112903973A - Soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control - Google Patents
Soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control Download PDFInfo
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Abstract
A soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control is divided into an automatic water replenishing system, an infrared distance measuring system, a quality monitoring and measuring system, a heating system and a data acquisition system. Presetting a mass threshold value of a soil mass sample by a quality monitoring and measuring system, and humidifying or heating the soil mass sample according to the mass range of the soil mass sample and the preset mass threshold value, namely, when the mass of the soil sample is reduced to the lower limit of the preset mass threshold value, opening an automatic water replenishing system to humidify the soil sample; and when the mass of the soil sample rises to the upper limit of the set mass threshold, starting the heating system according to the preset interval time. When the soil sample continuously completes one heating and humidifying process, a dry-wet cycle period is formed. Meanwhile, in the humidifying and heating processes, the quality of the soil sample is continuously collected through a quality monitoring and measuring system and a data collecting system; and measuring the deformation condition of the soil sample by an infrared distance measuring system and continuously or manually setting acquisition frequency to acquire the axial deformation and the radial deformation of the soil sample.
Description
Technical Field
The invention belongs to the field of soil property testing, and particularly relates to a soil dry-wet cycle effect simulation experimental instrument based on quality threshold control.
Background
In engineering practice, the internal humidity state of the engineering soil inevitably has seasonal fluctuation during the service period of the engineering soil. In actual engineering, if the soil body has a humidity change condition, the physical, strength, deformation and other characteristics of the soil body are inevitably changed correspondingly, so that the risk of engineering diseases is greatly increased.
In the existing literature, a dry-wet cycle method of drying and soaking repeatedly is adopted, namely, a sample is dried to constant weight and then soaked to saturation, and thus, a dry-wet cycle period is formed. However, in engineering practice, the soil for engineering may be in a saturated state, or may be in an unsaturated state or an oversaturated state. The experimental method does not consider the influence of the dry-wet cycle amplitude on the soil property, does not consider the influence of the overhigh drying temperature on the sample property in the drying process, and does not consider the external environment of the engineering soil.
In the conventional road foundation soil temperature and humidity monitoring experimental device with controllable dry and wet threshold and experimental method (CN 111239036 a), a hygrometer is buried in a soil body or a sample, and a dry and wet circulating system is started by monitoring the humidity of the soil body, so that the method has the main problems that: moisture has a humidity gradient in the process of permeating from outside to inside or from inside to outside in the soil body, if the number of the monitoring hygrometers in the sample body is small, when the positions of the hygrometers reach a preset threshold, the humidity in the soil body after final balance and stability exceeds the preset threshold, and the balance humidity cannot be accurately controlled; if through laying a plurality of humidity monitoring meters, though can realize soil body humidity accurate control relatively, nevertheless bury a plurality of hygrometers and wire in the soil body underground and be equivalent to actually forming the reinforcement effect to the sample, seriously influence the deformation law monitoring result of soil body in wet and dry cycle process.
In order to eliminate the influence, a dry-wet cycle experiment under a soil humidity controllable state is accurately carried out, and a soil dry-wet cycle effect simulation experiment instrument based on quality threshold control is developed.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems and the defects of the existing test instrument and method, the invention provides a soil body dry-wet circulation effect simulation test instrument based on quality threshold control, which can guarantee the water content of a soil body sample by controlling the quality of the soil body sample and accurately simulate the influence of the dry-wet circulation effect on engineering soil.
The technical scheme is as follows: a soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control is divided into an automatic water replenishing system, an infrared distance measuring system, a quality monitoring and measuring system, a heating system and a data acquisition system. Have the tray that holds the soil sample above the heating system, there is thermal-insulated cotton below the heating system, installs under the thermal-insulated cotton quality monitoring measurement system, install tray top and side infrared distance measurement system, automatic water supply system lets in through the water injection pipe in the tray, quality monitoring measurement system, data acquisition system, automatic water supply system and data acquisition system pass through the wire and link to each other.
The automatic water replenishing system takes a water replenishing tank as a main part and achieves the effect of regularly and quantitatively replenishing water by controlling the flow rate and time of water; the infrared distance measuring system measures deformation of the earth pillar by using an infrared distance measuring instrument; the quality monitoring and measuring system comprises a mobile terminal, a monitoring pressure sensor, a measuring pressure sensor and an explosion-proof lamp, wherein the total mass of a sample when a soil body reaches a dry and wet balance state can be calculated before a test, a mass critical value is preset, and the mass change of a soil column can be measured in real time; the heating system heats the soil body through the resistance heating wire; the data acquisition system acquires quality data and deformation data by continuously acquiring or manually setting acquisition frequency through a data acquisition instrument.
As an improved technical scheme of the invention, the automatic water replenishing system can preset the fluctuation range of the humidity and the dry-wet cycle period, and automatically replenish water to the soil mass sample in the tray according to the preset value. And the automatic water replenishing system quantitatively replenishes and humidifies the soil body sample in the tray according to the quality preset value.
As a technical improvement scheme of the invention, the infrared measurement system can monitor the deformation of the soil column in real time, and further summarize to form an axial deformation graph and a radial deformation graph which change along with time.
As a technical improvement scheme of the invention, the quality monitoring and measuring system can preset a soil mass sample critical value, and react to the automatic water replenishing system according to the soil mass sample critical value to stop or replenish water for the automatic water replenishing system, and generate a soil mass change diagram at a preset temperature.
As a technical improvement scheme of the invention, the heating system can preset temperature fluctuation range and dry-wet cycle period, and heat the soil mass sample in the tray according to the preset value.
As a technical improvement scheme of the invention, the data acquisition system can continuously or manually set acquisition frequency and output a quality change diagram and a soil sample deformation diagram.
Has the advantages that: the device is suitable for preparing the soil sample subjected to dry-wet cycle influence, and can realize the following steps: 1. the simulation of dry-wet circulation is automatically carried out, so that manpower and material resources are reduced, and the interference of human factors on the test is reduced; 2. the sensor is adopted for real-time monitoring, so that the precision of test data is improved; 3. the dry-wet cycle state of the engineering soil under various conditions can be simulated by presetting the humidity change and the dry-wet cycle period, and data acquisition can be carried out according to the preset frequency. 4. The invention realizes the concrete quantification of the mass threshold value in the dry-wet cycle of the engineering soil, and reflects the dry-wet state of the engineering soil in the actual engineering by ensuring the accuracy of the numerical value of the water content according to the concrete mass of the soil sample. 5. The invention can control the water content of the soil mass sample in the humidification process of the soil mass sample, and better conforms to the actual situation in engineering.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a front cross-sectional view of a can body of the present invention;
FIG. 3 is a left side cross-sectional view of the can body of the present invention;
fig. 4 is a top sectional view of the present invention.
In the figure: 1-a heat insulation board; 2-a tray; 3-a heating system; 4-heat insulation cotton; 5-a quality monitoring measurement system; 6-an infrared ranging system; 7-a data acquisition system; 8, an automatic water replenishing system; 9-a wire; 10-a water injection pipe; 11-quality threshold control system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in the figure, the soil body dry-wet cycle effect simulation experiment instrument based on the quality threshold control is divided into a heating system 3, a quality monitoring and measuring system 5, an infrared distance measuring system 6, a data acquisition system 7 and an automatic water replenishing system 8.
The specific implementation steps are as follows:
the first step is as follows: preparing soil body samples according to experimental requirements, and calculating the total mass of the samples when the soil body reaches a dry and wet balance state according to a soil mechanics formula.
The second step is that: and (3) setting a soil mass sample quality threshold in the quality monitoring control system according to the quality critical value obtained by the first step of calculation, and presetting the interval time after water supplement (the specific interval time required to be set is determined according to the soil sample and the test scheme).
The third step: setting a drying and heating temperature range, placing the prepared soil body sample in an instrument tray, and starting an infrared distance measuring system.
The fourth step: and starting a first dry-wet cycle, and when the quality monitoring and measuring system monitors that the quality of the soil sample is lower than a preset quality threshold, starting an automatic water replenishing system.
The fifth step: and after water supplement and humidification are carried out to the upper limit of the soil sample mass threshold, closing the water supplement system, and opening the heating system according to the preset interval time until the water supplement system is heated to the lower limit of the preset mass threshold, thereby completing one dry-wet cycle.
And a sixth step: and continuously acquiring quality and deformation data in the dry-wet cycle process. And completing the soil sample dry-wet cycle according to the preset dry-wet cycle times.
Claims (8)
1. A soil body dry-wet cycle effect simulation experiment instrument based on quality threshold control is characterized by comprising an automatic water replenishing system, an infrared distance measuring system, a quality monitoring and measuring system, a heating system and a data acquisition system, wherein a tray for containing a soil sample is arranged above the heating system, heat insulation cotton is arranged below the heating system, the quality monitoring and measuring system is arranged below the heat insulation cotton, the infrared distance measuring system is arranged above and beside the tray, the water replenishing system is introduced into the tray through a water injection pipe, the quality monitoring and measuring system, the data acquisition system, the automatic water replenishing system and the data acquisition system are connected through conducting wires, the water replenishing system comprises a water replenishing tank, and water is regularly and quantitatively replenished to a soil body by controlling the flow rate and time of water; the infrared distance measuring system measures the deformation of the soil sample through an infrared distance measuring instrument; the quality monitoring and measuring system comprises a pressure sensor and a module for setting a soil sample quality threshold value, and the soil sample quality is collected in real time in the test process; the heating system heats the soil body; the data acquisition system acquires the soil sample quality and the soil sample deformation through the data acquisition instrument.
2. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control as claimed in claim 1, wherein the quality monitoring system comprises a module for setting a soil sample quality threshold.
3. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control as claimed in claim 2, wherein the water supplementing system is configured to supplement water and humidify the soil mass samples in the tray according to the preset quality value.
4. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control as claimed in claim 3, wherein the water supplement system automatically supplements water to the soil mass sample in the tray at regular time and quantity according to the preset humidity fluctuation range and the dry-wet cycle period.
5. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control of claim 1, wherein the heating system comprises a resistance heating wire, and the soil mass sample in the tray is heated according to a preset value of quality.
6. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control according to claim 1 or 4, wherein the infrared measurement system comprises a statistical module for summarizing the soil sample deformation measured in real time into an axial deformation graph and a radial deformation graph which change along with time.
7. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control as claimed in claim 1 or 4, wherein the data acquisition system can continuously acquire or manually set acquisition frequency to acquire quality data, and the quality data is summarized into a quality curve graph and a deformation graph of the soil sample.
8. The soil mass dry-wet cycle effect simulation experiment instrument based on quality threshold control as claimed in claim 1, wherein a heat insulation board is arranged outside the experiment instrument to isolate the soil mass from the outside.
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118067503A (en) * | 2024-04-24 | 2024-05-24 | 潍坊华通膨润土有限公司 | Bentonite slurry sand hot-wet tensile strength tester |
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2021
- 2021-03-03 CN CN202110234400.9A patent/CN112903973A/en active Pending
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| CN103776983A (en) * | 2014-01-27 | 2014-05-07 | 甘肃省交通科学研究院有限公司 | Rock soil wetting-drying cyclic experiment apparatus |
| CN105004850A (en) * | 2015-06-03 | 2015-10-28 | 中南大学 | Testing device and method for quantitatively simulating drying-humidifying cycle of soil triaxial sample |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118067503A (en) * | 2024-04-24 | 2024-05-24 | 潍坊华通膨润土有限公司 | Bentonite slurry sand hot-wet tensile strength tester |
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