A new method for testing pile by single-impact energy and P-S curve |
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Authors: | Xu Zhao-yong Duan Yong-kang Wang Bin Hu Yi-li Yang Run-hai Xu Jun and Zhao Jin-ming |
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Institution: | (1) Institute of Disaster Prevention of Yunnan Province, 650041 Kunming, China;(2) Kunming Nanfang Technology and Consultation Company for Rock and Soil, 650091 Kunming, China |
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Abstract: | By studying the pile-formula and stress-wave methods (e.g., CASE method), the authors propose a new method for testing piles using the single-impact energy and P-S curves. The vibration and wave figures are recorded, and the dynamic and static displacements are measured by different transducers
near the top of piles when the pile is impacted by a heavy hammer or micro-rocket. By observing the transformation coefficient
of driving energy (total energy), the consumed energy of wave motion and vibration and so on, the vertical bearing capacity
for single pile is measured and calculated. Then, using the vibration wave diagram, the dynamic relation curves between the
force (P) and the displacement (S) is calculated and the yield points are determined. Using the static-loading test, the dynamic results are checked and the
relative constants of dynamic-static P-S curves are determined. Then the subsidence quantity corresponding to the bearing capacity is determined. Moreover, the shaped
quality of the pile body can be judged from the formation of P-S curves.
Foundation item: Key Projects of Tenth Five-year Plan of Yunnan Province (54-02-02). |
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Keywords: | single impact energy method dynamic P-S curves observation of single-pile bearing capacity quality estimation of pile body |
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