Soil body conductivity and permeability multi-functional test device and test method

Abstract

The invention discloses a soil body conductivity and permeability multi-functional test device which comprises a main body device, a support platform, a water flow conveying device and a collecting device. The main body device comprises a main cylinder body, an upper auxiliary cylinder and a lower auxiliary cylinder. The upper auxiliary cylinder and the lower auxiliary cylinder are connected with the main cylinder body through an acrylic splicing piece respectively. The upper auxiliary cylinder and the lower auxiliary cylinder are filled with permeable stones. A sample is placed in the main cylinder body. The sample is hammered in the main cylinder body through hammer layering. Copper mesh electrodes are arranged on upper and lower end faces of the sample. Two copper ring electrodes are pre-embedded in the inner wall of the main cylinder body. Three pairs of copper wire electrodes are pre-embedded with equal spacing along the axis direction in the main cylinder body. All electrodes are connected with a conductivity measurement system. According to the invention, through material selection and multiple electrode distribution modes, a permeability coefficient tester is combined to realize the local structure of the conductivity and permeability multi-functional test device; and the test device can accurately, conveniently and efficiently measure the permeability of a soil body.

Description

technical field [0001] The invention relates to a multifunctional testing device and a testing method for soil electrical conductivity and permeability, and belongs to the technical field of porous medium permeability testing and electrical conductivity testing. Background technique [0002] Earthquake is a sudden natural disaster, and the casualties and property losses it has caused cannot be estimated. my country is an earthquake-prone country. According to statistics, 41% of my country's land and more than half of the cities are located in areas with a basic earthquake intensity of 7 degrees or above. Sand liquefaction is a common earthquake damage phenomenon in earthquakes, and it has caused huge losses, forcing people to conduct in-depth research on it. The liquefaction process is accompanied by the flow of pore water, that is, seepage. Some domestic scholars have studied the characteristics of soil electrical conductivity. We have introduced soil electrical conductivi...

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Problems solved by technology

The material of the cylinder is mostly made of metal, which cannot be used for the test of electrical conductivity, and the wall of the cylinder is opaque, so it is impossible to observe the uniformity of the sample; the diameter and height of the sample are relatively large, and the wooden hammer is too rough, and the uniformity of the sample is dense. Difficult to guarantee; during the sample saturation process, the water stop clamp is not flexible enough to control the water supply pipe, and cannot control the sample saturation speed and reduce the erosion of the sample; the water flow in the sample first passes through the pressure measuring hole, and then passes through the Copper wire cloth to the pressure measuring tube is easy to cause blockage of the pressure measuring hole, especially when the sample is a fine sand sample.

In the existing indoor conductivity test experiments, the electrodes are mostly inserted, which will disturb the sample, and the lead-out of the electrode wiring will often cause disturbance to the sample or affect the airtightness of the instrument

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