瑞雷面波法在地铁隧道上覆地层探测中的应用

摘要

应用瑞雷面波法探测地铁隧道施工期上覆地层空洞及不密实,在探测过程中,主要采用模拟退火法进行反演,该非线性反演方法可以大幅减小初始模型对反演结果的影响,并避免结果陷入局部最优解,增强探测结果的真实性.在兰州地铁1号线探测实例中,将探测上覆地层存在空洞和不密实的结果与实际开挖对比,异常位置吻合,应用效果较好.探测实例证明,在城市浅层地质情况探查中,瑞雷面波法是可行且高效的探测方法之一.%In this paper,the Rayleigh wave method is applied to detect the cavity and leakiness of overlying strata of subway tunnel.In order to enhance the authenticity of the detection results,the simulated annealing method is used to invert the nonlinear inversion method,which can greatly reduce the influence of the initial model on the inversion results,and avoid the results to fall into the local optimal solution in the detection process.Comparing the case results with the actual excavation data in Lanzhou subway No.1 line,the defect position is consistent,with good application effect.The example shows that in the detection of urban shallow geology,Rayleigh Wave Method is one of the efficient and feasible detection methods.