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检层法测井在高速铁路路基评价中受到场地地质环境条件的影响,难以获得好的原始记录;测井作业方式直接影响数据采集质量,其中孔源距的选取乃获取正确记录的关键因素之一。受地质条件影响,对于存在特殊波速结构的场地,检层法测井孔源距的选取,需要综合考虑折射波干扰、浅部低速层、纵横波分离以及套管波等四个方面影响;理论分析论证了最佳孔源距选取依据,结合沪昆高速铁路客运专线检层法测井实例对其进行验证。
Well logging method is affected by geological and environmental conditions in high-speed railway subgrade evaluation, so it is difficult to obtain good original records. Logging operation mode directly affects the quality of data acquisition. The selection of hole source distance is the key factor to get correct records one. Affected by the geological conditions, for the site with special wave velocity structure, the selection of logging hole source spacing by layering method needs to consider the influences of refracted wave interference, shallow low-velocity layer, separation of longitudinal and transverse waves and casing wave. Theory Analysis and demonstration of the best basis for selecting the source spacing, combined with the Shanghai-Kunming high-speed railway passenger lapping logging example to verify it.