【摘要】 通过研究打桩公式法和应力波动法 (如CASE法 ) ,提出单次冲击能量及P S曲线测桩法 :用重锤或小型火箭筒一次冲击桩顶 ,用桩顶附近的检波器记录振波图和检测静、动位移 .通过实测冲击能 (总能量 )转换系数、波动和振动各自消耗的能量等各物理量 ,测定计算单桩竖向承载力 .利用振波图计算力 (P)与位移 (S)动态关系曲线 ,确定屈服点 ,并利用静载荷试验检验动测结果和确定动静P S曲线的相关常数 ,进而确定与承载力相应的沉降量 .而且 ,可由PS曲线的形态判定桩身成型质量 .更多还原

【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.更多还原