Abstract
Batter rock-socketed piles (BRSP) foundation is one of common foundations, such as port engineering or cross-sea bridge, while there are few studies on negative skin friction for BRSP. A series of model tests are conducted to explore negative skin friction of BRSP which are embedded in thick soft clay. The effects of the inclined angle of piles and soil consolidation time to negative friction resistance and the bending moment of BRSP are analyzed. The test results show that: the development of negative friction and bending moment BRSP have pronounced time effect; the longer the consolidation time is, the slower the axial force and bending moment intensify. The ultimate pile shaft axial force and bending moment increases nonlinearly concerning the inclined angle of piles. And the “neutral point” position and peak point of bending moment is always located at 0.9~1.0 times soil depth.
Highlights
Batter rock-socketed piles (BRSP) have been widely used in port engineering, cross-sea bridge, offshore wind power foundation, and other offshore projects due to their excellent horizontal bearing capacity
Negative friction resistance and bending moment generated by soil settlement in soil layer and surface load will affect the stability of pile foundation and bring hidden trouble to engineering construction
The model test aims to reveal the influence law of soil consolidation and settlement on inclined piles with different inclination angles in deep soil with overburden, and to summarize the rules of bending moment and negative friction resistance of piles influenced by consolidation time and inclination angle
Summary
Batter rock-socketed piles (BRSP) have been widely used in port engineering, cross-sea bridge, offshore wind power foundation, and other offshore projects due to their excellent horizontal bearing capacity. Negative friction resistance and bending moment generated by soil settlement in soil layer and surface load will affect the stability of pile foundation and bring hidden trouble to engineering construction. Studies on negative friction resistance of vertical piles show that consolidation and settlement of soil layer takes a long time. To enhance the performance effect of negative friction resistance in model test, soil settlement can be accelerated and increased using surface load[4,5,6], jack loading[7,8], air pressure loading[9,10], and vacuum preloading[11]. The changes of negative friction, axial force and bending moment of rock-socketed inclined piles with different inclination angles are analyzed under the condition of consolidation and settlement of soil surface under surcharge load. The influence of dip angle on load transfer law of pile is studied
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