Kan Wenguang, Yang Zailin, Sun Menghan
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China.
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China.
Sensors (Basel). 2022 Jul 15;22(14):5290. doi: 10.3390/s22145290.
Recently, with the development of geophysical exploration technology, geophysical engineering instruments and methods have also improved. The multi-electrode resistivity method is widely used in engineering exploration. In this paper, multi-electrode resistivity tests were carried out in a seasonal frozen soil area in Heilongjiang Province, to provide an optimized multi-electrode resistivity method under the conditions of frozen soil. Combined with shear wave velocity tests and standard penetration tests, multi-electrode resistivity tests were used to comprehensively analyze and evaluate the physical and mechanical properties of Tertiary semi-diagenesis rocks. The results show that the high resistivity due to the frozen surface layer acting as a shield can be eliminated by technical means. It is feasible to test the resistivity through the frozen surface layer. The multi-electrode resistivity method can visually reflect the interface between saturated sand and semi-diagenetic rocks. Dividing the interface between saturated sand and semi-diagenetic rocks is advantageous as the morphology of the resistivity curve has a significant curvature change. There is a strong correlation between the resistance and shear wave velocity of a strata in which the Pearson correlation coefficient is as high as 0.99. The multi-electrode resistivity method test used in combination with the shear wave velocity test and the standard penetration test could give the bearing capacity and frictional resistance of semi-diagenetic rocks, which saves a lot of time and material costs in engineering exploration.
近年来，随着地球物理勘探技术的发展，地球物理工程仪器和方法也得到了改进。多电极电阻率法在工程勘探中得到广泛应用。本文在黑龙江省季节性冻土区开展了多电极电阻率试验，以提供冻土条件下优化的多电极电阻率法。结合剪切波速试验和标准贯入试验，利用多电极电阻率试验对第三系半成岩岩石的物理力学性质进行综合分析和评价。结果表明，可通过技术手段消除冻土层作为屏蔽层导致的高电阻率。通过冻土层测试电阻率是可行的。多电极电阻率法能直观地反映饱和砂土与半成岩岩石的界面。划分饱和砂土与半成岩岩石的界面是有利的，因为电阻率曲线形态有明显的曲率变化。某地层的电阻与剪切波速之间存在很强的相关性，皮尔逊相关系数高达0.99。将多电极电阻率法测试与剪切波速测试和标准贯入试验相结合，可得出半成岩岩石的承载力和摩阻力，在工程勘探中节省了大量的时间和材料成本。
