论文部分内容阅读
通过高应变动力试桩法来获得桩土参数是目前比较流行的试桩方法,其原理主要是通过以桩顶的实测信息来反演桩土参数,其中比较成熟的CAPW APC法主要用试凑法来反演桩土模型参数,其反演结果呈现一定的随机性且正确性过于依赖操作者经验。本文尝试以CAPW APC法所采用比较成熟的桩土模型为基础,引入基于最佳摄动量法的局部优化方法来反演桩土参数。在弹性波波动方程隐式差分的基础上,对反演参数采用摄动展开并推导出参数反演的递推公式,最后给出合适的反演算法。考虑到初始参数对局部优化方法的影响,根据场地的实际情况选取合适的初始模型,计算显示可以获得比较理想的结果,说明本法是对桩基动测方法的一种有效的新尝试。
The pile-soil parameter obtained by high-strain dynamic test-pile method is the most popular test-pile method at present. The principle is mainly through the inversion of pile-soil parameters with the measured information of pile-tops. The mature CAPW- Method to retrieve pile-soil model parameters, the inversion results show a certain degree of randomness and the correctness is too dependent on the operator’s experience. Based on the more mature pile-soil model adopted by CAPW APC method, this paper attempts to use the local optimization method based on the best perturbation method to retrieve pile-soil parameters. Based on the implicit difference of wave equation of elasticity, the recursion formula of the inversion of parameter is derived by perturbation and expansion of the inversion parameters. Finally, a suitable inversion algorithm is given. Considering the influence of the initial parameters on the local optimization method, the suitable initial model is selected according to the actual situation of the site. The calculation shows that the ideal result can be obtained, which shows that this method is an effective new attempt to the dynamic measurement of pile foundation.