Expansive-soil slope hygroscopic deformation model experiment method and system

A deformation model and technology of expansive soil, which is applied in the system field of hygroscopic deformation model test of expansive soil slope and hygroscopic deformation model test of expansive soil slope, can solve the problems of large amount of deformation, difficulty in reflecting the permeability of expansive soil, etc. Reduce the test error, realize the effect of moisture expansion and deformation, and improve the work efficiency

Inactive Publication Date: 2014-07-30
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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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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  • Expansive-soil slope hygroscopic deformation model experiment method and system
  • Expansive-soil slope hygroscopic deformation model experiment method and system

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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 an expansive-soil slope hygroscopic deformation model experiment method and a system. The expansive-soil slope hygroscopic deformation model experiment method comprises following steps: A, soil samples are turned and subjected to sun drying so as to control water content and soil filling thickness; B, soil filling is carried out by layers, slope cutting is carried out uniformly, and a part of monitoring components are buried; C, an obtained soil slope is allowed to stand until cracks are generated, and a displacement sensor is arranged; D, physical quantity initial values are recorded; E, a rainfall simulator is used for realizing dropping-pouring type concentrated rainfall, and rainfall amount is controlled; F, physical quantities and rainfall amount are monitored according to rainfall stages; G, a rainfall-evaporation cycle is carried out repeatedly so as to stimulate drying and watering cycle; and H, slope morphologic change is recorded, and results are analyzed. The system comprises a model case, monitoring components, and a rainfall simulator; the monitoring components are arranged in the model case; and the rainfall simulator is arranged on the upper part slope shoulder of the model case. The expansive-soil slope hygroscopic deformation model experiment method and the system are suitable for a plurality of expansive-soil slope hygroscopic deformation model experiments, and possess significant importance for researches on expansive-soil slope stability and catastrophe mechanisms.

Description

Technical field [0001] The present invention involves the field of rock and soil engineering testing, and it also involves a test method of an expansion soil slope moisture absorption and deformation model. It also involves a system that expands the moisture -absorbing and deformation model test of the expansion soil.The deformation characteristics and evolution law of different parts of the slope, the surface of the slope, and the internal parts. Background technique [0002] In actual engineering, the expansion soil slopes are mostly seasonal. The atmospheric environmental factors are one of its main control conditions. The slopes of the slopes caused by climate change, the sliding of the road, and the widespread channel landslide. [0003] Generally speaking, continuous rainfall or repeated rainfall are the main causes of landslides.Under rainfall conditions, the expansion soil slope is exuded with the infiltration of water, which is rich in hydrophilic minerals, and the expan...

Claims

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Application Information

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Patent Type & Authority Applications(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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