(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. School of Civil Engineering and Architecture，Changsha University of Science and Technology，Changsha，Hunan 410114，China)
Abstract：The h-type anti-slide pile used in large landslides treatment is divided into two sections according to its bearing and deformation characteristics，which are the anti-slide section and anchorage section. Their bearing and deformation analysis models with the action of the landslide thrust were proposed based on the effecting characteristic of rock-soil mass to the front or back row piles. And their simplified calculation methods of internal force and deformation were also established based on the structure mechanics and pile foundation analysis theory. Then，the simplified calculation method of h-type anti-slide pile was presented. Finally，the influence rules of different loading conditions，pile section size，pile spacing，anchorage depth and other factors to the h-type anti-slide pile internal force and deformation were analyzed by the typical engineering example. The results show that the calculation results with these two methods are more in line with the actual engineering situation and close，which one is calculated by considering the rock-soil mass action force between the front and back row piles and another by distributing the landslide thrust with the proportional coefficient. The affection of cantilever length and landslide thrust to pile internal force and deformation are the greatest. The affection of pile section size to the pile top deformation is more than to the internal force. The cantilever length and landslide thrust should be determined reasonably during optimal design. The anchorage section length can be determined between 1/3 and 1/2 times of pile length. The transverse beam rigidity can be selected between 1.0 and 2.0 times of pile rigidity. And the piles space can be designed between 2.0 and 4.0 times of pile diameter in order to make the rock-soil mass between piles produce pressure and resistance or transfer landslide thrust.
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2016, Vol. 35 
