Slope stabilizing passive piles: A laboratory model study

Date

2023-12

Author

Ünver, Abidin Mengüç

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The behaviour of passive piles in a large shear box with different ratios of center to center pile spacing, s to pile diameter, d (s/d=5, 4, 3, 2, 1 and single pile test) and with different pile sockets into the stable soil layer were investigated within the scope of this research. A clay soil having an average undrained shear strength, cu=100 kPa was at the bottom of the shear box simulating the stable layer. The upper part of the shear box, which is movable in horizontal direction, was filled with a soft clay having an average undrained shear strength, cu=20 kPa. The pressures on model piles loaded passively by the movement of the upper box were recorded by the miniature pressure transducers mounted on the piles. The transducers were calibrated by soil and water. Both for soil and water calibration cases, it was observed that the loads acting on the piles decrease in the upper and lower zones of the shear plane as s/d ratio decreases. Soft soil and water calibrations can be accepted to be in a moderate compatibility as evidenced that upper loads do not deviate so much. However, this is not the case in stiff soil calibration results. Besides, both the maximum upper and lower pressures recorded are greater in 0.8×H socket case than the pressures recorded in 0.5×H socket case at all displacement levels (H: sliding layer depth). For shear contribution of piles, an optimum pile spacing of s/d=4 was determined as the most effective pattern.

Subject Keywords

Laboratory model test, Passive pile, Slope stabilization, Miniature pressure transducer, Soil and water calibration

URI

https://hdl.handle.net/11511/107805

Collections

Graduate School of Natural and Applied Sciences, Thesis