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在动力作用下饱和桩周土排水会对基桩工程性质产生很大影响,研究桩-土动力作用的排水计算很有必要。通过连续介质力学方法,利用两相饱和介质Biot动力方程固相与流相频域格林函数解答,结合排水状态Lamb表象积分,得到集中力作用下饱和土圆柱基桩排水量计算公式。按该公式计算了江苏省金坛市开发区联合中策橡胶项目基地在打桩施工中基桩的理论排水量,并与现场实测排水量对比,发现计算与实际测试的排水量相对误差较小,实际工程桩测试的平均每击排水量期望值为4.82 L,与计算排水量相对误差为34%。可以认为,该方法用于动力作用下饱和土基桩排水计算是合适的。但由于计算是在桩-土弹性系统的假定下进行的,没有考虑土的非线性变形影响,有待于进一步研究,使其更加符合实际。
Under the dynamic action, the drainage of saturated soil around the pile will have a great influence on the engineering properties of the pile. It is necessary to study the drainage calculation of pile-soil dynamic action. By using the method of continuum mechanics, the Biot dynamic equation of the two-phase saturated medium is used to solve the frequency-domain Green’s function in solid phase and flow phase, and the displace- ment state of Lamb surface integral is used to obtain the formula of displacement of saturated soil cylindrical pile under concentrated force. According to the formula, the theoretical displacement of the pile in piling construction of Joint Zhongce Rubber Project Base in Jintan City Development Zone of Jiangsu Province was calculated and compared with the measured displacement of the site. The relative error between calculated and actual test displacement was small. The actual engineering pile The average expected displacement per test was 4.82 L, which was 34% relative to the calculated displacement. It can be considered that this method is suitable for calculating the displacement of saturated soil-based piles under dynamic action. However, since the calculation is carried out under the assumption of pile-soil elastic system, the influence of soil nonlinear deformation is not considered and needs further study to make it more realistic.