Field modeling of laterally distributed landslide thrusts over anti-slide piles

In order to truly disclose the behavior of wholly buried anti-slide piles under laterally distributed landslide thrusts, based on a practical anti-slide pile, one of the piles used to stabilize the great landslide, i.e., Jingdou Mountain landslide at the left side of Pucheng-Nanping highway in Fujian Province, large scale field pushing pile tests are performed by using five hydraulic oil pumps and ten jacks. Using the self-designed test pit in the construction site, the laterally triangular, rectangular and parabolic distribution loads are applied on the pile respectively to simulate the probable distribution forms of landslide thrusts. The internal forces and deformation of the anti-slide pile are measured. The experiment results show that for anti-slide piles installed in a platform of landslide mass, for the sake of construction safety of artificial excavation, the reinforced concrete retaining walls above the top of the pile and protecting wall surrounding the pile hole can remarkably reduce the maximum bending moments of the pile and enhance its bearing capacity. If these positive factors are considered in the current designs, the design of anti-slide piles will be more scientific and reasonable. When the landslide thrusts are small and the slippery surfaces are shallow, the acting points of resultant forces of different load distribution forms change so little that the bending moments of anti-slide piles in archored segments have little variation. Therefore, the calculated results will be greatly affected by the hypothesis of different distribution forms of landslide thrusts.