Soil landslide matrix suction testing method and system based on soil body conductivity

A soil landslide matrix suction testing method based on soil body conductivity, comprising the following steps of:

• 1) establishing an unsaturated residual soil matrix suction measurement method based on soil body conductivity:
• ψ
• =
• 1
• α
• [
• (
• σ
• s
• σ
• )
• β
• p
• ⁡
• (
• β
• -
• 1
• )
• -
• 1
• ]
• 1
• β
• (
• 1
• )
• wherein in the formula, σ is soil body conductivity, σs is saturated soil body conductivity, ψ is matrix suction, α and β are fitting parameters, and p is a saturation index;
• 2) acquiring actual measurement data of an unsaturated soil conductivity-moisture content curve measured by an indoor soil slope rainfall experiment;
• 3) acquiring actual measurement data of an unsaturated soil moisture content-matric suction curve measured by an indoor soil slope rainfall experiment;
• (4) substituting the unsaturated soil conductivity data measured in the step 2) and the unsaturated soil matrix suction data measured in the step 3) into the formula (1) for fitting to obtain the saturation index p and the fitting parameters α and β;
• and
• 5) substituting the saturation index p and the fitting parameters α and β obtained into the formula (1) to obtain a conductivity-matric suction model of the soil body, and substituting a conductivity of an unsaturated soil body into the conductivity-matric suction model to obtain a matric suction of the soil body.