A rapid capillary water negative pressure measuring instrument and its working method

Abstract

The invention relates to a capillary water negative pressure quick measuring instrument and a working method thereof. The capillary water negative pressure quick measuring instrument is characterized by comprising a water supply tank, a sample tank, a water storage tank, a vacuum pump, a controllable vacuum suction pump and a PLC (programmable logic controller). The capillary water negative pressure quick measuring instrument has the advantages that the flow rate of the air suction of the controllable vacuum suction pump can be determined by the PLC and the controllable vacuum suction pump according to the property of a sample, the measuring permeation efficiency is higher, the measuring rate is quicker, a negative pressure value can be recorded by the negative pressure sensor through the PLC in real time, the negative pressure value of the sample in any phase of the ascending height measuring of the capillary water can be monitored, and the accuracy of the negative pressure measuring is guaranteed; the opening and closing of all valves in the capillary water negative pressure quick measuring instrument are controlled by the manual control type or the PLC control type; the negative pressure value of the capillary water can be automatically and quickly measured.

Description

technical field [0001] The invention relates to the field of soil water layer research, in particular to a capillary water negative pressure rapid measuring instrument and a working method thereof. Background technique [0002] Groundwater exists in rock voids, and the existence forms of water in rock voids include: bound water, gravity water, capillary water, gaseous water, and solid water. Capillary water is a form of water in the vadose zone. The study of capillary water is an important part of the study of the distribution and movement of water in the vadose zone. The rising height of capillary water is the water in the pores of loose rock, due to the action of capillary force, it rises at a certain speed until it reaches the maximum height of capillary water rising. Due to the infiltration and evaporation of groundwater, water is sometimes transferred through capillary water bands. Therefore, the determination of the rising height of capillary water is of great signif...

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Problems solved by technology

[0004] The above-mentioned patents are generally aimed at the measurement of parameters such as the capillary water rise height and velocity of sand, sandy soil, and silt. During the measurement, the general water negative pressure test does not use a vacuum pump, resulting in low negative pressure of clay capillary water, low penetration efficiency of water flow to clay, unsatisfactory penetration effect, slow test efficiency, wasting a lot of test time, and the test big error

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