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A model test method and system for moisture absorption deformation of expansive soil slope

A deformation model and expansive soil technology, applied in soil material testing, material inspection products, etc., can solve the problems of large deformation, difficult to reflect the permeability of expansive soil, reduce test errors, realize moisture absorption expansion deformation effect, The effect of saving filling materials

Inactive Publication Date: 2016-01-20
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The existing expansive soil slope deformation test model is often modified on the basis of the cohesive soil slope test model, and the test method basically adopts the general cohesive soil slope deformation test method. When the limit state is reached, the expected sliding surface is often considered in the form of a circular arc, which is difficult to reflect the low permeability of expansive soil, the shallow deformation of the slope, the large amount of deformation, and the fact that the deformation and failure of the slope are controlled by cracks Obvious and many other features

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  • A model test method and system for moisture absorption deformation of expansive soil slope
  • A model test method and system for moisture absorption deformation of expansive soil slope
  • A model test method and system for moisture absorption deformation of expansive soil slope

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Embodiment 1

[0045] The present invention will be described in further detail below according to accompanying drawing:

[0046] according to figure 1 , 2 , 3, 4, 5, 6, 7, 8, a kind of method of expansive soil slope hygroscopic deformation model test, its steps are:

[0047] Step 1: Turn over the soil samples collected on site, and fill the soil when the moisture content of the soil samples reaches 50-60% of the original sample. The filling soil should be consistent or similar to the actual engineering slope soil, and the permeability, expansibility, and mechanical properties of the soil should be kept as similar as the undisturbed soil to the greatest extent. The size of the soil filling should be combined with the size of the model box 1, and the hydraulic conductivity of the expansive soil is considered to be small, generally less than 10 -6 m / s, water on the slope surface is difficult to infiltrate, and the filling size is controlled to a thickness of about 0.6~0.8m.

[0048] Step 2...

Embodiment 2

[0056] A model test system for hygroscopic deformation of expansive soil slopes, comprising: a model box 1 , monitoring components 2 , and a simulated rainfall device 3 . The monitoring components 2 are installed inside and on the surface of the soil in the model box 1, and the simulated rainfall device 3 is placed at the shoulder section of the upper part of the model box 1.

[0057] Described model case 1 is formed integral frame by vertical support beam 11, cross support beam 12, inclined support beam 13, rib type cross beam 14, secondary cross beam 19, adds inclined-plane bottom plate 15, bottom panel 16, side panel 17, front panel 18 form a casing. The model box 1 is a wedge-shaped box with a sloped bottom. The external size is about 5.5m×2.0m×1.5m. The internal slope is designed as a slope. The slope ratio of the slope bottom plate 15 is consistent with the actual slope ratio, which is about 1: 1.5~1:3. Its connection relationship is: the two sides of the model box 1 h...

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Abstract

The invention discloses a model test method and system for hygroscopic deformation of expansive soil slopes. The steps are: A. drying soil samples, controlling moisture content and filling thickness; ; C. Set aside the slope to wait for the cracks to develop, and arrange displacement sensors; D. Record the initial value of the physical quantity; E. Use the simulated rainfall device to perform drip-type concentrated rainfall on the slope shoulder to control the rainfall; F. Monitor the physical quantity and the value according to the rainfall stage Precipitation; G. Rainfall-evaporation is repeated to simulate the dry-wet cycle; H. Record slope shape changes and analyze the results. The system includes: a model box, monitoring components, and a simulated rainfall device. The monitoring components are installed in the model box, and the simulated rain device is placed on the upper shoulder of the model box. The invention is applicable to various model tests of expansive soil slopes absorbing moisture, and has great significance for the research on the stability and catastrophe mechanism of expansive soil slopes.

Description

technical field [0001] The present invention relates to the field of geotechnical engineering testing, more specifically to a method for testing expansive soil slope moisture absorption deformation models, and also relates to a system for expansive soil slope moisture absorption deformation model tests, which is suitable for testing different types of expansive soil slopes Deformation characteristics and evolution rules of different parts of slope surface and interior under hygroscopic conditions. Background technique [0002] In actual engineering, the instability and landslides of expansive soil slopes are mostly seasonal, and atmospheric environmental factors are one of the main controlling conditions. Slope instability, embankment collapse, and channel landslides caused by climate change are widespread. [0003] Generally speaking, continuous rainfall or repeated rainfall are the main causes of landslides. Under rainfall conditions, with the infiltration of water in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 戴张俊陈善雄姜领发
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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