打桩过程中,由于冲击力的作用,使桩身不同位置产生压应力和拉应力。此外,还伴随有非锤击应力产生。 目前,分析及计算打桩应力的方法较多,但主要有锤击能量平能法和波动法。桩的应力波传播的波动方程法发展较快,应用较广,又比较接近实际。因此,美、日、英、苏等国都重视这个领域的 Piling process, due to the impact of the role of the pile body to produce different locations of compressive stress and tensile stress. In addition, there is a non-hammer stress generated. At present, there are many ways to analyze and calculate the pile driving stress, but there are mainly the hammer energy leveling method and the wave method. The wave equation of pile stress wave propagation has developed rapidly, widely used, and more realistic. Therefore, the United States, Japan, Britain, the Soviet Union and other countries attach importance to this area