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首页> 外文期刊>Geophysics: Journal of the Society of Exploration Geophysicists >Soil density, elasticity, and the soil-water characteristic curve inverted from field-based seismic P- and S-wave velocity in shallow nearly saturated layered soils
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Soil density, elasticity, and the soil-water characteristic curve inverted from field-based seismic P- and S-wave velocity in shallow nearly saturated layered soils

机译：浅层近饱和层状土壤中基于实地地震P波和S波速度的土壤密度，弹性和土壤水特征曲线

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摘要

Soil density, porosity, elastic moduli, and the soil-water characteristic curve (SWCC) are important properties for soil characterization. However, geotechnical and laboratory tests for soil properties are costly and limited to point sampling sites. Seismic surveys can provide laterally continuous, seismic soil property values that may complement geotechnical borehole tests with less cost. We have developed a workflow to invert for soil properties and the SWCC from seismic P-and S-wave velocity-versus-depth profiles interpreted from shallow (<25 m depth) unconsolidated sediments under conditions of near-full saturation (>99%). The inversion is performed by using the covariance matrix adaptation evolution strategy to search automatically for optimal input soil property values by minimizing the misfit between field-based velocity profiles and predicted velocity profiles based on the Hertz-Mindlin and Biot-Gassmann theories. The results from seismic soil property inversion are validated by comparison with geotechnical as well as laboratory results conducted independently in the same area as the seismic survey. For each seismically recognizable layer, soil types are interpreted from the inverted soil density and elasticity, aided by the SWCC to help detect thin units that are below the original seismic resolution of the field data. There is flexibility to apply our suggested workflow in future studies. For a known geologic setting, empirical relationships and other velocity prediction models could also be incorporated into the suggested workflow to improve inversion results and extract additional information in soils.
机译：土壤密度，孔隙率，弹性模量和土壤水特征曲线（SWCC）是表征土壤的重要属性。但是，对土壤特性进行岩土工程和实验室测试的成本很高，并且仅限于点采样地点。地震勘测可以提供横向连续的地震土壤属性值，从而可以以更低的成本补充岩土钻孔测试。我们已经开发了一种工作流程，可通过在接近完全饱和（> 99％）的条件下根据浅（<25 m深度）未固结沉积物解释的地震P和S波速度与深度剖面反演土壤性质和SWCC的方法。通过使用协方差矩阵适应性进化策略来执行反演，以通过基于Hertz-Mindlin和Biot-Gassmann理论使基于场的速度剖面和预测的速度剖面之间的不匹配最小化来自动搜索最佳的输入土壤属性值。通过与在地震勘探相同区域中独立进行的岩土工程和实验室结果进行比较，可以验证地震土属性反演的结果。对于每个地震可识别层，土壤类型通过反演的土壤密度和弹性来解释，在SWCC的帮助下，有助于检测低于现场数据原始地震分辨率的薄层单元。可以灵活地将我们建议的工作流程应用于将来的研究。对于已知的地质环境，经验关系和其他速度预测模型也可以并入建议的工作流程中，以改善反演结果并提取土壤中的其他信息。

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