A Method of Quickly Distinguishing Expansive Soil (Rock) On Site Using Soil Conductivity

A soil conductivity and expansive soil technology, applied in the field of rock and soil mechanics and engineering, can solve the problems of high technical difficulty and impact, and achieve the effect of easy operation, simple and practical method

Inactive Publication Date: 2011-12-28
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also obvious deficiencies in the free expansion rate test, such as sample preparation, sieving, weighing, stirring, etc. all have a certain impact on the test results, a

Method used

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  • A Method of Quickly Distinguishing Expansive Soil (Rock) On Site Using Soil Conductivity
  • A Method of Quickly Distinguishing Expansive Soil (Rock) On Site Using Soil Conductivity
  • A Method of Quickly Distinguishing Expansive Soil (Rock) On Site Using Soil Conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: Hebei area

[0045] Select two groups of samples, sample 1 indoor free expansion test δ = 115%; conductivity test σ = 155ms / m, according to the fitting curve δ = 0.0013σ 2 The free expansion rate calculated by +0.445σ+9.7251 δ=110%, is divided according to the expansibility grade stipulated in the "Technical Code for Construction in Expansive Soil Areas" (GBJ112-87), and the grades of the two methods are all strong expansive soils , indicating that the result of conductivity estimation by the method of the present invention is in full agreement with the measured results. Using the test data of sample 2 can also achieve the purpose of accurately judging the expansibility.

Embodiment 2

[0046] Example 2: Henan area

[0047] Seven groups of samples with different lithologies were selected for indoor free expansion rate test and electrical conductivity test respectively. The actual test results are shown in the table above. According to the fitting curve provided by the present invention, the corresponding free expansion rate calculation value can be obtained, and the expansion grades stipulated in "Expansive Soil Area Building Technical Specifications" (GBJ112-87) are divided, except for the expansion of sample 5. Except for discrepancies in the judgment, the expansibility grades of the rest of the samples are completely consistent.

Embodiment 3

[0048] Example 3: other regions

[0049] Five groups of samples from Hubei, Guangxi, Hunan and other regions were selected for indoor free expansion rate test and conductivity test. The actual test results are shown in the table above. According to the fitting curve provided by the present invention, the corresponding free expansion rate calculation value can be obtained, and according to the expansion grades stipulated in the "Expansive Soil Area Building Technical Code" (GBJ112-87), the expansion grades of all samples are completely unanimous.

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Abstract

The invention discloses a method for rapidly discriminating expansive soil (rock) on site by the use of soil electrical conductivity, and belongs to the technical field of rock and soil mechanics and engineering. The method comprises the following steps: (1) preparation in advance: establishing a universal relationship curve between soil free-expansion rate and electrical conductivity, or establishing a relationship curve between soil free-expansion rate and electrical conductivity on the special site; (2) on-site sampling: preparing a soil paste with water content being 70%, and uniformly stirring soil and water by the use of a glass rod for later use; (3) on-site test: testing the conductivity of the above soil sample by the use of a soil conductivity probe, followed by recording; (4) expansibility discrimination: conjecturing the free-expansion rate of the soil sample by the conductivity of actually measured soil sample, and determining the grade of the expansive soil (rock) according to Technical Specifications for Construction Ground in Expansive Soil Areas (GBJ112-87). The method provided by the invention is simple, practical, rapid and accurate, is easy to operate, is especially suitable for project site, and is of great significance for 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 rapidly discriminating expansive soil (rock) which is difficult to discriminate on the engineering site. Background technique [0002] Expansive soil is a kind of highly plastic clay formed in arid and semi-arid areas and affected by environmental humidity and heat changes. Due to its special clay mineral composition, it has a large liquid limit, strong expansion and contraction performance, water absorption expansion, and water loss shrinkage. specialty. When carrying out engineering construction in expansive soil areas, landslides, foundation cracks or deformation often occur, so the engineering community regards it as a "difficult soil". [0003] Usually, in the early stage of project construction, the engineering geological conditions and engineering geological problems within the scope of the project are determined t...

Claims

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Application Information

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IPC IPC(8): G01N27/04G01B7/02
Inventor 龚壁卫程展林李青云
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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