Application of microtremor exploration in surface matrix survey of black land:a case study of Moqi
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摘要: 【研究目的】当前黑土地地表基质调查工作在东北地区广泛开展，其中物探方法是调查黑土地地表基质层垂向结构特征的重要手段。本文选取了松嫩平原莫力达瓦达斡尔族自治旗（简称莫旗）中的典型地表基质区域进行了微动勘探剖面测量和阵列测量等工作，通过这些工作来验证微动勘探方法在黑土地地表基质垂向结构调查中的应用效果。【研究方法】本文利用人工源与天然源面波相结合的微动勘探技术，通过提取各测点的面波频散曲线进行反演分析，利用视横波速度变化推测不同基质的波速和垂向空间结构特征，并结合钻探验证得到地表基质层（0～40 m）的垂向结构特征。【研究结果】通过对莫旗典型区域的微动剖面调查，结合钻孔校正和区域物性参数，绘制出了研究区二维视横波速度剖面和三维阵列模型，探明了这些地区0～40 m 的地表基质层空间结构、土质类型、土质基质厚度和分布特征等信息，得出了研究区地表基质层的地质特征和视横波速度范围。【结论】通过本次研究，发现人工源与天然源面波联合勘探效果显著，有效结合两者的优势，可以提高勘探深度和浅表分辨率，增强单一方法的勘探能力，是适用于地表基质层调查的有效地球物理手段，能够为地表基质调查垂向结构调查提供科学有效的数据支持。Abstract: This paper is the result of ground matrix survey.[Objective] At present, the investigation of black land surface matrix is widely carried out in Northeast China, and various geophysical methods are important means to investigate the vertical structure characteristics of black soil surface matrix. In this paper, the typical surface matrix area in the Molidawa Daur Autonomous Banner ( Moqi for short ) of the Songnen Plain was selected to carry out micro-tremor exploration profile measurement and array measurement,so as to verify, the application effect of micro-tremor exploration method in the vertical structure investigation of black land surface matrix.[Methods] In this paper, the microtremor exploration technology combining artificial source and natural source surface wave is used. By extracting the surface wave dispersion curve of each measuring point for inversion analysis, the wave velocity and vertical spatial structure characteristics of different matrices are inferred by using the apparent shear wave velocity change, and the vertical structure characteristics of the surface matrix layer ( 0 ~ 40 m ) are obtained in combination with drilling verification.[Results] Based on the investigation of the micro-motion profile in the typical area of Moqi Banner, combined with borehole correction and regional physical parameters, the two-dimensional apparent shear wave velocity profile and three-dimensional array model of the study area were drawn. The spatial structure, soil type, soil matrix thickness and distribution characteristics of the surface matrix layer of 0 ~ 40m in these areas were explored, and the geological characteristics and apparent shear wave velocity range of the surface matrix layer in the study area were obtained. [Conclusions] Through this study, it is found that the combined exploration effect of artificial source and natural source surface wave is remarkable.Effectively combining the advantages of both can improve the exploration depth and shallow resolution, enhance the exploration ability of a single method, and is an effective geophysical method suitable for surface matrix layer investigation.It can provide scientific and effective data support for the vertical structure survey of surface matrix survey.
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Key words:
- ground matrix /
- microtremor exploration /
- apparent shear wave velocity structure. /
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