CMPCC面波技术在铁路工程地质勘察中的应用研究

Application Study of Railway Engineering Survey Technology Based on CMPCC Surface Waves

研究目的:多道瞬态面波方法是一种重要的浅地表工程地质勘察技术,该方法在提高勘探深度的同时往往导致横向分辨率降低,难以对横向复杂多变的地质结构进行探测。为能够兼顾勘探深度和横向勘探精度,本文结合实际工程场地,开展共中心点互相关(CMPCC)面波勘察技术应用研究。研究结论:(1)与传统单点瞬态面波勘探方法相比,共中心点互相关(CMPCC)瞬态面波法能够充分刻画目标测点位置的频散变化,在理论上有较大提升;(2)实际工区应用表明,与传统单点瞬态面波勘探方法相比,CMPCC瞬态面波法在保证勘探深度的同时能够显著提高横向勘探精度;(3)CMPCC方法在一定程度上考虑了地下构造的横向变化特征,在复杂地质条件地区有较好的应用前景。

Research purposes:The multi-channel analysis of the surface wave method is an essential near-surface engineering geological survey technology.However,it always has a poor horizontal resolution,which makes it difficult to detect the complex and varied geological structures.Thus,this paper focuses on the application of the common middle point cross-correlation(CMPCC)surface wave method and aim to consider both the exploration depth and the horizontal exploration precision in the real implementation.Research conclusions:(1)Compared with the traditional single point analysis of surface wave method,the CMPCC two-dimensional surface wave inversion strategy can adequately describe the dispersion curve of the target point,which has a significant improvement in theory.(2)Real case application results demonstrate the effectiveness of the CMPCC method,which can significantly improve the horizontal resolution without affecting the exploration depth,compared with the traditional single point analysis of surface wave method.(3)CMPCC method has a better application prospecting in the complex geology area because the lateral variation of the subsurface structure has been taken into account.