Rainfall landslide early warning system based on elastic wave velocity

An early warning system and elastic wave technology, applied in the direction of alarms, material inspection products, instruments, etc., can solve the problems of high cost of prevention and control means, poor early warning effect, and inability of sensors to effectively monitor potential landslide areas

Inactive Publication Date: 2019-10-22
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The cost of traditional prevention and control measures is too high to be implemented
[0005] (2) The current landslide early warning equipment adopts the early warning critical value that considers the change of soil physical properties, and the early warning effect for landslides that may occur in potential disaster-affected areas is poor
However, scattered sensors cannot effectively monitor potential landslide areas, because these sensors are only sensitive to deformation and water content changes in their vicinity

Method used

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  • Rainfall landslide early warning system based on elastic wave velocity
  • Rainfall landslide early warning system based on elastic wave velocity
  • Rainfall landslide early warning system based on elastic wave velocity

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0126] Triaxial water injection test.

[0127] Triaxial test at confining pressure σ 3 =10kPa, principal stress ratio K=2.6, and saturation Sr=15%. Figure 8 Saturation, axial strain and elastic wave velocity obtained for triaxial tests. With the infiltration of water, the lower part of the specimen is infiltrated first, and then seeps upward through capillary water suction. During the test, the moisture distribution of the specimen is not uniform in its height.

[0128] As the water content increases, the axial strain of the specimen begins to increase linearly. When approaching failure, the axial strain accelerates ( Figure 8 b). Low-density soils have a greater deformation rate than high-density soils. Figure 8 c shows that the P-wave velocity is greater than the S-wave velocity. The elastic wave velocity of the high-density specimen is greater than that of the low-density specimen. Similar to the observation results of axial strain, the wave velocity of elastic w...

example 2

[0131] Slope model tests.

[0132] Figure 10 and Figure 11 The changes of saturation, inclination angle and elastic wave velocity of slope angle of 40° and slope angle of 50° are given respectively. With continuous rainfall, the saturation in the lower part of the slope increases first, forming a groundwater table at the toe of the slope. As the groundwater level rises, the soil in the upper part of the slope is gradually saturated or nearly saturated. Slope deformation develops upward from the toe. After the saturation ratio reaches a certain level, the lower part of the slope first slides. At the same time, the upper part of the slope began to deform, indicating that after the toe of the slope slipped, the entire slope tended to become unstable. The inclination deformation before the landslide is small, and the inclination angle suddenly increases when the landslide occurs suddenly. Small slippage at the toe of a slope can also serve as a harbinger of an impending la...

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Abstract

The invention belongs to the technical field of natural disaster prevention and control, and discloses a rainfall landslide early warning system based on elastic wave velocity. The system is providedwith a frame. A pressure chamber is fixedly mounted in the frame. A permeable stone is fixedly mounted on the top of the pressure chamber. A clay plate is fixedly mounted on the bottom of the pressurechamber. Bending elements are symmetrically mounted on the lower surface of the permeable stone and the upper surface of the clay plate. A pressure sensor, an oscilloscope and a signal amplifier areembedded in the bending elements. The elastic wave velocity decreases slowly with the increase of the water content and decreases sharply with the increase of the deformation, and the wave velocity decreases sharply in case of approaching instability. The possible mechanism of the decrease of the elastic wave velocity caused by water content and deformation is explained according to the experimental results, and it is proposed that the landslide early warning is given when the wave velocity decreases abruptly. A new method and a reliable basis can be provided for landslide disaster preventionand reduction and prediction and forecast.

Description

technical field [0001] The invention belongs to the technical field of natural disaster prevention and control, and in particular relates to a rainfall type landslide early warning system based on elastic wave velocity. Background technique [0002] At present, rainfall landslides are one of the most important geological disasters in the world. With the development of information technology, landslide early warning systems have gradually entered people's field of vision due to their low environmental and economic costs. Especially in some large-scale landslide cases, due to the traditional prevention and control measures, such as anchor rods, retaining walls, etc., the cost is too high to be implemented. Therefore, developing a simple, economical and practical early warning system has become the best choice. Early warning system is an effective alternative to landslide management at present, which can detect landslide indicators early and evacuate potentially affected resid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B21/10G01N33/24
CPCG01N33/24G08B21/10
Inventor 陈宇龙邓雪杰聂闻滕腾
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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