EXPERIMENTAL INVESTIGATION OF THE BEARING PERFORMANCE AND FAILURE CHARACTERISTICS OF DOUBLEROW PILE-SLAB STRUCTURES IN STEEP MOUNTAINOUS AREAS.

RUI SU; QIAN SU; PENG CHENG; HENG ZHOU; XUN WANG; YANFEI PEI

Considering the pile-slab subgrade project of the Hangzhou-Huang Shan Passenger Dedicated Line as the basis, this paper conducts a 1:10 largescale indoor model test for the horizontal bearing capacity of the pile-slab structure in steep mountainous areas to study the distribution of the pileslab structure stress, soil pressure and structural deformation and analyze the failure mode of the structure and slope. The research shows that when the subgrade with a double-row pile-slab structure is subjected to horizontal loading in the steep slope section, the steel bars of the pile body above the sliding surface are compressed, and the steel bars of the pile body below the sliding surface are under tension. With the increase in the horizontal load, the stress of the pile body steel bar remains basically unchanged or shows a steady increase and finally sharply increases. The deformation of the bearing plate is dominated by the horizontal displacement, and the horizontal displacement reaches 7.25 mm when the plate is broken. In addition, warping deformation of the inner high and outer low occurs. When the horizontal load reaches 157 kN, shallow damage and local collapse of the slope occur, and transverse and diagonal cracks occur at the top of the pile and near the sliding surface of the pile. During the test, the pile-slab structure always deforms more than the slope, and the overall stability of the structure is good. The test is suitable for sections where the remaining sliding force is less than 770 kN/m (equivalent to a slope length of 79.123 m).

BEARING capacity of soils; SLOPES (Soil mechanics); STEEL bars; DEFORMATIONS (Mechanics); STRUCTURAL stability; FAILURE mode & effects analysis; CONCRETE slabs; BORED piles; HIGH speed trains

Baltic Journal of Road & Bridge Engineering (RTU Publishing House), 2023, Vol 18, Issue 2, p152

1822-427X

Academic Journal

10.7250/bjrbe.2023-18.602