Abstract:

Using dynamic finite difference software-FLAC, combining with strength reduction dynamic analysis method, a new method for anti-sliding pile aseismic design is proposed. Taking the security and stability factor of the landslide as a discount factor of rock mass parameters, then the rock mass parameters is discounted. Using FLAC dynamic analysis, soil-pile dynamic interaction is considered; the peak internal forces of piles engendered during the earthquake is divided by the coefficient of concrete strength increasing under earthquake, which compared with the internal forces of piles after the earthquake, the larger is considered to be the value of internal forces for aseismic design. While after the piles have been supported, the dynamic safety factor of the landslide should greater than the acceptable value to ensure the landslide would not damage over topping. An example of landslide with pile supported is given. The results show that the strength reduction dynamic analysis method is able to consider soil-pile dynamic interaction, and get the real distributed form of thrust force, so as to provide a new idea for aseismic design of anti-slide piles.

Key words: landslide engineering, anti-slide pile, aseismic design, strength reduction dynamic analysis method