全波形反演方法在复合地基承载力检测中的应用

发布时间：2018-06-01 23:22

本文选题：弹性波 + 全波形反演　；参考：《地下空间与工程学报》2016年S2期

【摘要】：弹性波全波形反演方法是岩土工程领域中一种较新的无损检测手段,它综合运用响应波场的振幅、旅时、相位和频谱特种等波形信息,通过一定的数学反演方法,获取目标介质的物理力学参数,具有对介质模型精确刻画的潜力。将时域有限差分法结合完全匹配层吸收边界条件技术实现对弹性波波动方程数值模拟求解。然后将拟线性最优化法与随机搜索法相结合,发展了一种稳定、高效且适用于尺度较小(0.1~10 m)的时间域弹性波全波形反演方法,具有对初始模型依赖少,易收敛于全局最优解等优点。将弹性波全波形反演方法应用我国北方某住宅楼已建结构实体的复合地基承载力检测复核中,根据在该楼混凝土地下室底板上采集到响应波场,全波形反演方法计算获得地下室底板下部复合地基剪切波速剖面,进而通过经验公式获得复合地基综合承载力值,取得了良好的应用效果。
[Abstract]:The full wave inversion method of elastic wave is a relatively new nondestructive testing method in geotechnical engineering. It synthesizes the waveform information such as amplitude, travel time, phase and spectrum of response wave field, and adopts certain mathematical inversion method. Obtaining the physical and mechanical parameters of the target medium has the potential of accurately characterizing the medium model. The finite difference time-domain method (FDTD) combined with perfectly matched layer absorbing boundary condition technique is used to solve the elastic wave equation numerically. Then, by combining the quasi-linear optimization method with the random search method, a stable, efficient and suitable time domain elastic wave full waveform inversion method is developed, which has less dependence on the initial model. It is easy to converge to the global optimal solution and so on. The elastic wave full waveform inversion method is applied to check the bearing capacity of the composite foundation of a residential building in the north of China. The response wave field is collected on the basement floor of the concrete building. The shear wave velocity profile of the composite foundation under the basement floor is obtained by using the full waveform inversion method, and the comprehensive bearing capacity value of the composite foundation is obtained by empirical formula, and a good application effect is obtained.
【作者单位】：上海城建市政工程(集团)有限公司;
【基金】：中国地震局黄土地震工程重点实验室开放基金(KLLEE-14-002)
【分类号】：TU470

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