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

A testing device and soil stratification technology, applied in the field of indoor penetration test research, can solve the problems of inability to test, single soil property requirements, lack of data acquisition system, etc., and achieve the effect of saving time and cost, saving labor cost and easy operation.

Inactive Publication Date: 2019-01-08
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Effect test

Embodiment 1

[0018] Example 1. The design parameters and requirements of the main components of an intelligent test device for the analysis of soil layered permeability characteristics proposed by the present invention are further disclosed as follows:

[0019] The material of the cylindrical glass cylinder (4) of the present invention is transparent plexiglass, height is 1m, and internal diameter is 20cm; The height is 2cm; The distance between the metal orifice (11) and the bottom of the cylindrical glass cylinder (4) is 2cm, and the diameter of the metal orifice (11) is 19.8cm, the inner diameter of the hole is 2mm; The side of shaped glass cylinder (4) is provided with a plurality of calibers and is the water seepage valve (5) of 0.5cm, is good with 8-10 water seepage valves (5), present embodiment 1 adopts 9 water seepage valves (5), The distance between two adjacent water seepage valves (5) is 12cm; the distance between the top water seepage valve (5) and the top of the cylindrical ...

Embodiment 2

[0020] Example 2. A kind of measuring method of the intelligent testing device that the present invention proposes is used for soil layer seepage property analysis, is characterized in that, comprises following basic steps:

[0021] Step 1, assemble the intelligent testing device: first set the circular base (9) horizontally, fix the cylindrical glass cylinder (4) of the soil holding unit on the circular base (9), and set the metal orifice plate (11) horizontally on the At 2 cm from the bottom of the cylindrical glass cylinder (4), the seepage pipes (6) are tightly connected to each seepage valve (5); the constant pressure water pump (1), the water pipe (2), and the nozzle (3) of the water supply device are sequentially connected to each other. connected, the water supply device is located directly above the cylindrical glass cylinder (4); inside the cylindrical glass cylinder (4) there are a plurality of soil layered structures of equal height from bottom to top, and each lay...

Embodiment 3

[0028] Example 3. A kind of evaluation method of the measuring method of the intelligent testing device that the present invention proposes is used for the soil layer seepage property analysis, it is characterized in that, comprises following basic evaluation content:

[0029] Evaluation 1, accuracy: if the error between the water volume measured by the water seepage sensor and the water received by the measuring cylinder is 26-30 points, the measurement error is ≤1%; if the error is 21-25 points, the measurement error is ≤2%; the error is 11-20 Points, measurement error ≤ 5%; error 0-10 points, measurement error > 5%;

[0030] Evaluation 2, reaction time difference: if the time error between the water seepage sensor and the stopwatch is 26-30 minutes, the reaction error is ≤2s; if the error is 21-25 minutes, the reaction error is ≤5s; if the error is 11-20 minutes, the reaction error is ≤ 10s; the error is 0-10 points, the response error> 10s;

[0031] Evaluation 3, specifi...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/082
Inventor 魏继红刘瑾宋泽卓白玉霞张达亓孝辉汪勇冯巧王芊祁长青钱卫
Owner HOHAI UNIV
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