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Static Penetration Probe for Determination of Resistivity of Expansive Soils

A static penetration, foundation soil technology, applied in the field of foundation soil survey, foundation structure engineering, construction and other directions, can solve the problems such as the inability to quickly obtain the expansion rate of expansive soil, large variability, and trouble.

Active Publication Date: 2019-01-18
CCCC FIRST HIGHWAY CONSULTANTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The free expansion rate test of expansive soil is usually cumbersome, and the expansion rate of the corresponding expansive soil cannot be quickly obtained, and the variability is large. Different researchers of the same soil sample often come to different conclusions

Method used

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  • Static Penetration Probe for Determination of Resistivity of Expansive Soils
  • Static Penetration Probe for Determination of Resistivity of Expansive Soils

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Embodiment Construction

[0015] The present invention will be further explained below in conjunction with the accompanying drawings.

[0016] The present invention is a static penetrating probe suitable for the determination of the resistivity of expansive foundation soils, which can be used to test the resistivity and water content values ​​of expansive sites on the spot. It is currently used in the domestic and foreign methods of discriminating and classifying expansive soils. On the basis of calibration, the expansion characteristics of expansive sites can be calibrated and analyzed, so as to realize rapid on-site identification.

[0017] The probe integrates the function of conventional pore pressure static penetration testing, which can measure end resistance, friction resistance, inclination and pore pressure, and also has the function of soil resistivity test. like figure 1 As shown, a coaxial cable 1 is provided in the center of the static penetration probe, and four ring electrodes are wrapp...

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Abstract

The invention discloses a static sounding probe having a resistivity measurement function and applicable to expansive foundation soil. The periphery of an upper-half rod body of the static sounding probe is coated with four annular electrodes; the annular electrodes are isolated through insulating layers; the two annular electrodes in the middle are test electrodes; the upper annular electrode and the lower annular electrode are emission electrodes; the emission electrodes are used for emitting electric current to the soil body; the test electrodes are used for measuring the potential difference; and the resistivity of the soil body around the electrodes can be calculated in combination with the Ohm's law. With the probe, a powerful recognition tool is provided for evaluation of the expansive foundation soil in the environmental geotechnics.

Description

technical field [0001] The invention relates to a static sounding probe suitable for measuring the resistivity of expansive foundation soil, which belongs to a static sounding device in the field of geotechnical engineering. Background technique [0002] Static CPT technology is a geotechnical engineering investigation and testing technology, which refers to using a pressure device to press a penetrating rod with a probe into the test soil layer, and to test the cone tip resistance and side wall friction resistance of the soil through the measurement system Some basic physical and mechanical properties of soil can be determined, such as the deformation modulus of soil, the allowable bearing capacity of soil, etc. However, the resistivity, moisture content, and special soil expansion characteristics cannot be measured by static penetration testing. [0003] Expansive soil is a kind of special cohesive soil. The soil contains a large amount of hydrophilic minerals. When the h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D1/02
CPCE02D1/025
Inventor 张留俊寇博尹利华刘军勇张发如谢诗元张梅玲刘松玉储亚徐磊边汉亮
Owner CCCC FIRST HIGHWAY CONSULTANTS
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