Abstract
In the process of rapid drawdown of reservoir water level, the seepage force in the slide mass is an important factor for the stability reduction and deformation increment of many landslides in the reservoir areas. It is feasible to improve the stability of seepage-induced landslide by employing a drainage well to reduce or eliminate the water head difference that generates the seepage force. In this paper, the Shuping landslide, a typical seepage-induced landslide in the Three Gorges Reservoir area of China, is taken as an example. A series of numerical simulations were carried out to figure out the seepage field, and the Morgenstein–Price method was adopted to calculate the landslide stability. Then the influence of horizontal location of the drainage well, drainage well depth, drainage mode on the landslide treatment effect, and the applicability of drainage well were analyzed. The results show that: (1) landslide stability increases obviously with the well depth in the slide mass, while the increment of landslide stability with the well depth is limited in the slide bed; (2) the sensitivity of the stability improvement with the depth is greater than that with the horizontal positions of the drainage wells in the slide mass; (3) the drainage well is suggested to be operated when the reservoir water falls rather than operates all the time; and (4) the drainage method is most suitable for landslides with low and medium permeability. These results provide deep insights into the treatment of seepage-induced landslides.
Highlights
The continuous construction of hydropower projects around the world has been greatly changing the surrounding hydrogeological environments and triggering numerous geo-hazards
The horizontal position can be decided according to the pumping capacity of different well positions
The specific ideas are wells using an analytical solution, but it can be solved by some mature intelligent optimization as follows: (1) according to the actual geological structure, the precise numerical model of landslide is algorithms
Summary
The continuous construction of hydropower projects around the world has been greatly changing the surrounding hydrogeological environments and triggering numerous geo-hazards. Qianjiangping landslide, which was triggered after the first trial storage of the Three Gorges Reservoir This landslide ruined 346 houses, took 24 lives, and caused 1200 people homeless [2]. These famous disaster events occurred in reservoir areas resulted in severe consequences of casualties and economic losses, attracting wide public concerns. In the normal operation of reservoirs, the storage can be quickly vacated in rainy seasons to prevent flooding, leading to rapid drawdown of reservoir water levels [3] In this process, great seepage force pointing to the outside of landslide is produced, resulting in decreased stability and intensifying landslide deformation [4,5]. Nakamura [6] made statistics on reservoir landslides in Japan, and the
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