Application of transient Rayleigh wave method in inspecting the foundation treated by dynamic consolidation by drainage

The inspecting principle and field inspecting technique with transient Rayleigh wave method are presented.

The transient Rayleigh wave method is applied to the test of expressway project, and its advantages of simplicity and economy are also brought into full play.

Research on application of instantaneous Rayleigh wave method to inspection of dike cutoff wall quality;

SVD algorithm for inversion of instantaneous Rayleigh wave is proposed in this paper, which improves shear wave precision and resolution by weight matrix, enhances iterative effect and adjusts the relation between resolution and solution by self-adaptation iterative damping factor.

Based on measured data in exploration of quaternary period,the relativity of Rayleigh wave velocity and transverse wave velocity is discussed,and it confirms the veracity and reliability of instantaneous Rayleigh wave in shallow geological engineering exploration.

Application of transient Rayleigh wave exploration technique in detecting unloading depth of rock slope;

Thinned Damped Weighted Least Square Algorithm is used to invert transient Rayleigh wave dispersion curves for lower velocity layers.

With practical examples, the paper has further investigated and discussed the data-collecting technique in transient Rayleigh wave materials, and analysed various factors such as arousing factors, accepting factors, observation parameters and each data, as well as multi-stacking and so on that affecting transient Rayleigh wave exploration and adopted relative data-collecting technique.

The present paper has dealt with the principle of transient state Rayleigh wave elploration, and analysed various factors affecting transient state Rayleigh wave exploration and the datacollecting technique tEat should be adopted.

With an example from expressway construction engineering in Anhui Province,this paper introduced application of the transient Rayleigh surface wave technique to geological reconnaissance of highway engineering for solving the issue of geotechnical layering at places of high slope,deep chasm,bridge and tunnel at the entrance and exit as well as zoning of the weathered bedrock.

The multi-channel transient Ralyleigh wave exploration technique is a new technique developed recently, which has a lot of advantages such as high resolution, widely applicable, simple-equipment, efficient, non-destructive and so on.