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Method for carrying out on-site evaluation on expansion property of expansive soil by utilizing electrical resistivity

A technology of expansion performance and resistivity, which is applied in the field of rapid evaluation and prediction of expansive soil rocks, can solve the problems of large variability, inability to quickly obtain the expansion rate of expansive soil, troubles, etc., and achieve the effect of easy operation, simple and practical method

Active Publication Date: 2017-05-17
SOUTHEAST UNIV
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Problems solved by technology

However, the 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

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  • Method for carrying out on-site evaluation on expansion property of expansive soil by utilizing electrical resistivity
  • Method for carrying out on-site evaluation on expansion property of expansive soil by utilizing electrical resistivity
  • Method for carrying out on-site evaluation on expansion property of expansive soil by utilizing electrical resistivity

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Embodiment Construction

[0037] The present invention will be further explained below in conjunction with the accompanying drawings.

[0038] A method for on-site evaluation of expansive soil expansive properties by electrical resistivity, comprising the steps of:

[0039] Step 1: Test the resistivity value of the target expansive soil area by using resistivity static penetrating technology on site.

[0040] In step 2, the water content and density of the target expansive soil area are measured through on-site sampling, and the porosity and saturation of the soil are calculated accordingly.

[0041] Step 3, calculate the free expansion rate of the target expansive soil area according to the prediction formula of resistivity free expansion rate, and determine the grade of expansive rock and soil according to the GBJ112-87 building technical specification for expansive soil area; wherein, the resistivity free expansion rate prediction formula for: δ is the free expansion rate of expansive soil, ρ is ...

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Abstract

The invention discloses a method for carrying out on-site evaluation on an expansion property of expansive soil by utilizing electrical resistivity and belongs to the technical field of rock-soil mechanics and engineering. The method comprises the following steps: firstly, testing an electrical resistivity value of a target expansive soil region on site by adopting an electrical resistivity static sounding technology; secondly, testing a moisture content value and a density value of the target expansive soil region through on-site sampling, and calculating the porosity and saturation degree of a soil body according to the moisture content value and the density value; finally, calculating a free expansion ratio of the target expansive soil region according to an electrical resistivity free expansion ratio predication formula, and determining grades of expansive rock and soil according to Technical Code for Buildings in Expansive Soil Regions GBJ112-87. The method disclosed by the invention is simple and practical, easy to operate and rapid and accurate, is especially suitable for construction sites and has very important meanings on engineering design and construction.

Description

technical field [0001] The invention belongs to the field of rock-soil mechanics and engineering technology, and in particular relates to a new method for quickly evaluating and predicting expansive soil rocks that are difficult to distinguish at engineering sites or indoors by means of electrical resistivity. Background technique [0002] Special soil refers to soil that has special physical, mechanical and chemical properties in nature and affects engineering geological conditions. Due to the particularity of geotechnical characteristics, when conducting geotechnical engineering surveys on construction sites composed of such rocks and soils, it is often necessary to use some special survey tools for exploration and sampling work, so as to obtain geotechnical mechanics and Physical properties and other index data, do a good job in geotechnical engineering survey work in special soil areas. Expansive soil is a kind of special soil. [0003] Expansive soil refers to the hig...

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Application Information

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IPC IPC(8): G01N27/04G01N15/08G01N9/36G01N33/24
CPCG01N9/36G01N15/088G01N27/041G01N33/24G01N33/246
Inventor 刘松玉储亚徐磊边汉亮
Owner SOUTHEAST UNIV
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