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Model test apparatus for measuring landslide slope displacement stress of step-slope excavation in real time

A model test device and real-time measurement technology, which can be used in measurement devices, soil material testing, material inspection products, etc. Effect

Active Publication Date: 2016-08-10
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad generally adopt appropriate landslide models to carry out model tests when conducting research on this issue. When studying the causes of landslides, the research on push-type landslides is generally more in-depth, and the research on traction-type landslides is more in-depth. few

Method used

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  • Model test apparatus for measuring landslide slope displacement stress of step-slope excavation in real time
  • Model test apparatus for measuring landslide slope displacement stress of step-slope excavation in real time
  • Model test apparatus for measuring landslide slope displacement stress of step-slope excavation in real time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The model test device for real-time measurement of the displacement stress of the excavated slope landslide includes a landslide model system, a displacement stress test system and a PIV test system; the landslide model system includes a landslide sliding surface and three sets of jacks, and the landslide sliding surface includes an inclined sliding surface And the horizontal sliding surface, the inclined sliding surface is hinged by the first, second and third sliding panels with a width of 1300mm, a thickness of 20mm, and a length of 400mm, 300mm, and 300mm respectively. The horizontal sliding surface is composed of the same width and thickness, and the length is 600mm The first and fourth sliding panels are hinged with the third sliding panel on the inclined sliding surface, and the first, second, third, and fourth sliding panels are respectively hinged by two small sliding panels of the same size. The sliding panels can be plexiglass Or glass steel plate and other sm...

Embodiment 2

[0100] Arrange 6 pressure sensors in embodiment 2, compared with embodiment 1, the first, second and third pressure sensors (P1, P2, P3) are removed, and the upper support baffle plate in the horizontal direction on the landslide sliding surface moves downward to ensure that the slope The soil coverage on the sliding surface is 600mm, and all the other test conditions are the same as in Example 1. It is obtained that the soil displacement, pressure, shear stress and surface morphology of the landslide occur in the process of obvious sliding damage. The displacement sensor is arranged at The soil coverage is outside the range, so the displacement sensor does not measure the displacement change. The changes of soil pressure and shear stress with the excavation width are shown in Table 5-6 and Figure 14-15 , the shear stress sensors S1 and S2 are located outside the coverage of the soil, so the shear stress sensors S1 and S2 have no measured data. In Table 6 and Figure 15 is no...

Embodiment 3

[0106] Such as Figure 7 As shown, the height of the jack is adjusted so that the sliding surface is 50° as a whole, and the rest of the test conditions are the same as in Example 1, and the changes in soil displacement, pressure, shear stress and surface morphology during the obvious sliding failure process of the landslide are obtained, see Table 7-9 and Figure 16-18 .

[0107] Table 7 Variation of soil displacement with excavation width

[0108] Displacement sensor number

h1

h2

h3

h4

h5

Displacement sensor value (mm)

Excavation width (m)

0

0

0

0

0

0

0.1

0.02

0.03

0.05

0.03

0.01

0.2

0.03

0.08

0.13

0.09

0.03

0.3

0.05

0.12

0.21

0.13

0.04

0.4

0.06

0.16

0.26

0.15

0.06

0.5

0.08

0.23

0.36

0.22

0.07

0.6

0.1

0.26

0.41

0.25

0.09

0.7

0.13

0.32

0....

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Abstract

The invention discloses a model test apparatus for measuring landslide slope displacement stress of step-slope excavation in real time. The model test apparatus includes a landslide model system, a stress-strain test system and a PIV test system. Compared with the prior art, the test apparatus can simulate the step-slope excavation process which leads to slope landslide well and can simulate stress and displacement status of the slope landslide under different sliding surface situations. A high-precision displacement sensor, a pressure sensor and a shear stress sensor are disposed on the sliding surface in the test apparatus, so that pressure, shear stress and displacement change of soil body can be measured accurately in real time. A high-precision camera is arranged above the model and meanwhile PIV technology is employed to measure the slope displacement image of the sliding surface in the whole process in real time. The model test apparatus is convenient to use, employs the instruments being simple in structure, has strong adjustability and is easy to use.

Description

technical field [0001] The invention relates to a landslide model test device applied to geotechnical engineering, in particular to a model test that can simulate the process of grading and excavating landslides and measure the displacement and stress-strain variation laws of different sliding surface forms in real time device. Background technique [0002] The research and exploration of the force situation of the sliding body and the variation law of displacement stress when the landslide slides due to different causes has always been a key issue in geotechnical engineering. Scholars at home and abroad generally adopt appropriate landslide models to carry out model tests when conducting research on this issue. When studying the causes of landslides, the research on push-type landslides is generally more in-depth, and the research on traction-type landslides is more in-depth. few. In practice, the stress conditions and stress-strain law of traction landslides are differen...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01D21/02
CPCG01D21/02G01N33/24
Inventor 姜彤雷家华张俊然张昕王忠福
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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