基于钻进参数的岩土地层结构识别技术与方法

岩土地层结构是影响工程稳定与安全的重要因素,是地质及岩土工程勘测的主要内容。研发了一种地层地质界面识别系统,阐述了其基本组成和工作原理,建立了钻进过程识别码及岩土地层结构实时识别方法;通过花岗岩地基钻进试验研究,确定了岩体风化等级以及土层/散体、碎裂岩体及整体岩体结构的比能值范围,建立了金刚石钻进比能的地层结构分级标准,比能值分别是土层及散体为0.0017~0.6955 k N·m/cm3,碎裂岩体为0.0258~0.9798 k N·m/cm3,整体岩体为0.0018~2.4935 k N·m/cm3。研究结果表明,该方法与岩土勘测结果一致,可用于地层地质及岩土地层结构的实时识别,为岩土工程智能勘测提供了新的途径。

Techniques and approaches for identification of geo-formation structure based on diamond drilling parameters

The geo-formation structure is an original impact factor for the stability and safety of geotechnical and geological engineering and also an important content of field survey. A geo-formation identification while drilling (GIWD) system is developed, and its operating principles as well as the basic units are illustrated. The drilling process is coded, and a real-time identification method for the geo-formation structure is established. Besides, the ranges of specific energy values in weathered rock and structural rock mass of soil layer/scattered, cracked and intack granite are determined. The classification standard of diamond drilling specific energy for geo-formation is formulated and verified by in-situ drilling tests. The specific energy values are 0.0017~0.6955 kN·m/cm³ for the soil layer and scattered structure, 0.0258~0.9798 kN·m/cm³ for the cracked rock and 0.0018~2.4935 kN·m/cm³ for the intack rock, respectively. The results show that the above approach agrees with the traditional investigation and can further be applied for real-time recognition of strata and geotechnical structure, and it may provide a new approach for geotechnical engineering survey.