Abstract
During the reservoir operation process, the long-term security and stability of the bank slope is affected by dynamic response characteristics of its seismic action directly. Aimed at the typical bank slope existing in the actual reservoir environment, an experiment considering reservoir water level fluctuation and soaking-air-drying cyclic water-rock interaction has been designed and conducted while the cyclic loading test was performed in different water-rock cycles. Research results indicate the following: Firstly, in the process of water-rock interaction, the dynamic characteristics of sandstone show evident degradation trend, with the increase of the damping ratio and Poisson’s ratio and decrease of dynamic elastic modulus, and the former six water-rock cycle degradation effects are particularly obvious. Secondly, the numerical analog computation analysis of dynamic response in typical bank slope shows that as the water-rock interaction period is increased, the dynamic response of the slope hydro-fluctuation belt zone increases gradually, while the other parts weaken. Thirdly, under the long-term water-rock interaction process, the hydro-fluctuation belt zone gradually becomes a “soft layer” which is sensitive to the earthquake effect and dynamic response, resulting in a direct influence on long-term seismic performance of the bank slope. Therefore, it is necessary to make better protection for the bank slope hydro-fluctuation belt zone.
Highlights
In the process of hydraulic and hydroelectric engineering construction, reservoir impoundment will change geological and mechanical conditions naturally formed over the years [1]. is has triggered series of new geological disasters, one of which is inevitable reservoir earthquake. e reservoir earthquakes can be classified as karst type, ore collapse type, and superficial stress adjustment type [2]
Since the impoundment of the ree Gorges Reservoir on June 2003, a series of reservoir earthquakes ensued along the river section in Zigui and Badong County, which has reached over ten thousand times so far
Except for deformation and damage of hydraulic structures, like the rock collapse in the higher water pressure [6, 7], reservoir-induced earthquake generates significant impacts on the deformation and safety of the bank slopes. us, the dynamic response to the seismic action of the bank slope plays an important role in the long-term deformation and stability analysis
Summary
In the process of hydraulic and hydroelectric engineering construction, reservoir impoundment will change geological and mechanical conditions naturally formed over the years [1]. is has triggered series of new geological disasters, one of which is inevitable reservoir earthquake. e reservoir earthquakes can be classified as karst type, ore collapse type, and superficial stress adjustment type [2]. Except for deformation and damage of hydraulic structures, like the rock collapse in the higher water pressure [6, 7], reservoir-induced earthquake generates significant impacts on the deformation and safety of the bank slopes. Previous studies on water-rock interaction show that the saturated condition or dry-wet circulation influenced obviously the static characteristics of rock mass. E rock dynamic parameter deterioration influenced by water-rock interaction is less considered in the long-term evaluation of the bank slope stability. Considering the repeated fluctuation of the reservoir water level and the process of soaking-air-drying circulation, the water-rock interaction test is designed and carried out. By the numerical simulation calculation of FLAC3D software on the dynamic module, the research on the slope dynamic response under long-term water-rock interaction was carried out in this paper
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