An intelligent test device, measurement method and evaluation method for analyzing the permeability characteristics of soil layers

Abstract

The invention relates to an intelligent testing device for soil mass layered permeability characteristic analysis. The intelligent testing device is characterized by comprising a soil containing unit, a water supply device and an intelligent testing unit; the soil containing unit comprises a cylindrical glass barrel, water seepage valves, a cylindrical base, a water seepage pipe and a metal pore plate; the water supply unit comprises a constant-temperature water pump, a water pipe and a sprayer which are sequentially connected. The intelligent testing unit comprises a water content sensor, a water seepage quantity sensor and a water pressure sensor which are connected with a computer through signal receivers. The water supply unit is located over the soil containing unit. Multiple soil mass layered structures with the same height are arranged in the cylindrical glass barrel from bottom to top. A water content sensor, a water seepage quantity sensor and a water pressure sensor are arranged on the inner side wall of each layered structure. The soil mass layered permeability characteristic status can be easily, conveniently and precisely tested, the positioning precision of a system, a measuring method and an evaluation method are provided, and the intelligent testing device is suitable for replacing existing products in the field.

Description

technical field [0001] The invention belongs to the technical field of indoor penetration test research, and in particular relates to an intelligent testing device, a measurement method and an evaluation method for analyzing the permeability characteristics of soil layers. Background technique [0002] According to statistical analysis, most geological disasters and accidents in geotechnical engineering are related to water in soil. The increase of water in the soil will sharply reduce the matrix suction of unsaturated soil; part of the rock and soil will soften and the structure of the soil will be destroyed; when seepage occurs, many unfavorable factors may be added due to the effect of seepage force. At present, the test of soil permeability characteristics in the laboratory mainly includes constant head penetration test and variable head penetration test. In traditional penetration tests, sandy soil and clay soil need to be done separately. Ordinary indoor penetration t...

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Problems solved by technology

At present, the test of soil permeability characteristics in the laboratory mainly includes constant head penetration test and variable head penetration test. In traditional penetration tests, sandy soil and clay soil need to be done separately. Ordinary indoor penetration tests cannot test the permeability characteristics of layered soils

The water content of the soil is an important physical index to indicate the water content of the soil, and the ordinary indoor penetration test cannot measure the water content of the soil layer before saturation in real time.

Chinese patent application 201220321449.4 discloses a kind of "intelligent test system for soil material permeability characteristics". Although it has a data acquisition system and integrates constant water head penetration test and variable water head penetration test, it still has the following deficiencies: First, it cannot be realized The layering of the soil does not monitor the water flow through the cross-section of the soil layer during the test of each layer of soil; the second is that the change of the moisture content of each layer of soil before saturation during the test cannot be monitored

Chinese patent application 201220655588.0 discloses a "new constant head permeameter". Although it has realized the layering of the soil, it still has the following shortcomings: First, the instrument can only be used for sandy soil, not viscous To test the permeability characteristics of the soil, the requirements for the properties of the soil are single; the second is the lack of a data acquisition system, and the water flow through the cross-section of each layer of soil cannot be tested during the test

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