Slope damage criterion research centrifugal model test system under root system and seepage coupling

Abstract

The invention discloses a slope damage criterion research centrifugal model test system under root system and seepage coupling. The centrifugal model test system comprises a rigid simulation box, an underground water seepage system, a root system biomechanical soil fixation system and a slope body moisture-stress-deformation monitoring system. The real stress environment of vegetation coated slopebody is restored by means of a large geotechnical centrifuge; biomechanical soil fixation functions (transpiration and reinforced soil fixation effects) of different vegetation root types are simulated, the seepage evolution path and the seepage line height of the slope are changed by accurately applying hydraulic environment conditions of the rear edge of the slope in a graded mode, and the whole process of inducing slope instability failure evolution is simulated. A large geotechnical centrifuge provides a stress environment of a prototype slope body for the slope body model. An undergroundwater seepage system provides stable underground water force gradient conditions with different heights for the slope body. A root system biomechanical soil fixing system realizes regulation and control of slope surface moisture by root system transpiration and soil fixing effect of root system reinforcement anchoring.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering and test models, in particular to a general centrifugal model test system for researching the critical conditions of downslope instability coupled with seepage and root system soil stabilization. Background technique [0002] my country's mountainous area accounts for 69% of the land area, and it is one of the countries most seriously affected by landslide disasters. Under the conditions of frequent extreme rainfall events and intensified engineering disturbances, the risk of landslide disasters is increasing, and the importance of disaster prevention and mitigation has become increasingly prominent. Collapses and landslides on vegetation-covered slopes in mountainous areas have the characteristics of wide distribution, frequent occurrence, great harm, and complex water environment. Compared with traditional slope protection methods, plant slope protection has the characteristics...

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Problems solved by technology

[0006] (1) The stratum structure that can be simulated by the system is single, and complex stratum structure combinations cannot be simulated, and the shallow vegetation on the slope surface is not considered;

[0007] (2) Most of the model test systems are in a constant gravity environment, which cannot restore the real in-situ stress environment of the prototype slope;

[0008] (3) The model test system mostly focuses on the research of plain slopes without roots, without considering the biomechanical function of the vegetation root system, that is, it cannot simulate the transpiration and reinforcement and anchorage of the vegetation root system;

[0009] (4) The seepage conditions of the model test system are single, mostly concentrated in the rainfall test, and the hydraulic gradient conditions of the groundwater cannot be quantitatively controlled;

[0010] (5) The monitoring parameters of the model test system are single, and the multi-field coupling response mechanism of parameters such as moisture field-stress field-displacement field of the slope cannot be considered comprehensively;

[0011] (6) The role of vegetation cover has not been comprehensively considered from the engineering point of view in the design of geotechnical engineering slopes at home and abroad, mainly because of the lack of comprehensive and profound understanding of the soil-fixing mechanism of plant slope protection

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