Centrifugal model test device and method for simulating reservoir bank slope instability induced by water level fluctuations

Abstract

The invention discloses a centrifugal model test device and method for simulating reservoir bank slope instability induced by water level fluctuations. A reservoir water level simulation area is formed between the near-water side of a slope and the inner wall of a model box, a water inlet is formed in the top wall of the model box of the reservoir water level simulation area, an overflow port anda water outlet are sequentially formed in the side wall of the model box of the reservoir water level simulation area from top to bottom, and an electromagnetic valve A is arranged at the water outlet; and a triangular support is arranged between the downstream side of the slope and the inner wall of the model box, the bottom edge of the triangular support is supported on a support, an undergroundwater level simulation area is formed between the downstream side of the slope and the inner wall of the model box, a communicating pipe is fixedly connected to the support and communicates with thereservoir water level simulation area and the underground water level simulation area, and a micro pressure type water level sensor is arranged in the slope. The centrifugal model test device and themethod can simulate reservoir water level elevation, fluctuation speeds and stable repose angles, can guarantee that the test result can truly reflect the deformation and stability conditions of the actual reservoir bank slope, and have good reference significance for the slope maintenance and reinforcement technology.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a centrifugal model test device and method for simulating bank slope instability induced by water level fluctuations. Background technique [0002] In order to meet the needs of flood control and fully develop water conservancy and hydropower resources, my country has built a large number of hydropower projects in recent decades. The construction of the reservoir dam has changed the hydrological characteristics of the original river basin, and the fluctuation of the upstream water level of the reservoir has also changed the mechanical characteristics of the reservoir slope soil, which in turn caused the instability of the reservoir slope. The soil on the reservoir bank slope is saturated with water, the physical and mechanical strength is reduced, and it is subjected to periodic reciprocating seepage, which eventually causes the topography of the reservoir bank to change, ...

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Problems solved by technology

[0003] The dynamic development process of soil bank slope deformation induced by the periodic fluctuation of reservoir water is a process of repeated changes and adjustments of the dynamic and static water pressure in the slope body. It is difficult for ordinary physical model tests to simulate the real stress environment. Therefore, most scholars usually use centrifugal Research on the evolution and deformation failure of reservoir bank slope by model test method

[0004] However, the existing slope centrifugal model test devices and methods have shortcomings such as single model structure, low repeatability, and test operations that do not match actual conditions.

The application number is 2018106427390, and the name of the invention is a Chinese invention patent application for a physical model that simulates groundwater-induced soil slope instability. It only considers the impact of the rise and fall of the groundwater level on the bank slope of the reservoir, and ignores the actual operation of the reservoir. Realize the effect of multiple cycle fluctuations of the reservoir water level on the slope

In the centrifugal model device disclosed in this application, the water tank is arranged on one side of the model box, which is prone to wear and tear when the centrifuge is running at high speed, and it is difficult for the device to ensure the continuous supply of water flow under the action of the centrifugal force generated by the high-speed rotation of the centrifuge. It is difficult to realize the conversion of 1g gravity field to Ng gravity field water flow

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