An electroosmosis test system for studying the factors affecting the electrode switching time

Abstract

The invention relates to the technical field of electroosmosis in rock and soil engineering and discloses an electroosmosis testing system for studying influence factors to the electrode conversion time. The system is developed for solving the problem of the functional limitation of the testing system in current study of electroosmosis electrode conversion and the limitation of the study on the influence factor of the electrode conversion time. The electroosmosis testing system mainly comprises an electrode conversion device, an electroosmosis testing model device, a direct-current power supply and a computer system. The electroosmosis testing system disclosed by the invention has the beneficial effects that the combined use of full automation and semi automation for electrode conversion is realized, wherein the full-automatic control electrode function comprises automatic electrode conversion adopting current, time, displacement and pH value as control objects, and the semi automation means that manual operation of electrode conversion also can be realized in the system. An achievement can be obtained by studying the period rule of the electrode conversion time in the electroosmosis process, and the related function in the invention also can be used for electroosmosis operation at an actual construction site so as to save labor, time, energy consumption and cost.

Description

technical field [0001] The invention relates to the technical field of electroosmotic tests in geotechnical engineering, and can be used for the research on factors affecting electrode switching time and the electroosmotic treatment of soft soil by using the electrode switching method in engineering. Background technique [0002] A kind of soft soil with high moisture content, high void ratio, high compressibility, low permeability and low bearing capacity is widely distributed in the eastern coastal areas of China. Due to the scarcity of land in the east, current geotechnical engineering workers are focusing on finding a new method to deal with this soft soil foundation to expand the available land area. So electroosmosis came into being, and its high efficiency, time-saving and labor-saving features have attracted the attention of many researchers. However, there are still some difficult problems in the treatment of soft soil foundation by electroosmosis at present, such ...

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Problems solved by technology

However, there are still some difficult problems in the treatment of soft soil foundation by electroosmosis at present, such as high energy consumption in the process of electroosmosis, large reduction in efficiency in the later stage of electroosmosis, uneven distribution of soil strength after electroosmosis, etc., which seriously affect the Popularization and application of electroosmosis

[0003] Therefore, in view of the large reduction in efficiency in the later stage of electroosmosis and the uneven distribution of soil strength at the end of electroosmosis, people thought of a way to alleviate it through electrode switching, but the choice of electrode switching time period has become a need. Difficulties to overcome, because the selection of the electrode conversion time period largely determines the efficiency, effect and energy consumption of electroosmosis treatment. If it is not properly controlled, it will lead to extended working hours, increased costs, and poor treatment effects.

From just a few seconds to several hours, or even a day, any period of time can be selected as the time period of electrode conversion for people to study, so it is difficult to grasp the length of the time period that can be selected, but it is still Many scientific researchers are committed to the research of electrode switching time by selecting different time periods. It is conceivable that the workload is heavy and the cost of scientific research is high.

[0004] In addition, many invention patents on electroosmotic electrode switching test devices have been applied to the research of electrode switching time periods. For example, CN101319612A and CN102393404A have disclosed two inventive devices or systems for electroosmotic treatment of soft soil foundations, but The former is limited to switching electrodes by observing that the current decreases to a certain value, while the latter is limited to switching electrodes after observing that the displacement reaches a certain value. The selection of these values ​​is actually the same as the time period for electrode switching of different lengths of time as mentioned above. research trials like

Moreover, these two test systems cannot obtain the changes of various parameters inside the soil with the progress of electroosmosis time and the distribution of various parameters with space, so it is difficult for researchers to conduct in-depth analysis of electroosmosis to solve many problems, such as The pH value that affects the electroosmotic efficiency (when the pH is less than 3 greatly limits the electroosmotic efficiency), ion concentration, water content and other changes with time and spatial position

Other research devices or systems in electroosmosis have similar problems, limiting the progress of scientific research

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