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动力触探以其经济、简便、勘测周期短、提供资料数据化,乐于为设计人员的所采用。我们成都局设计所从1983年采用动探以来,目前已占钻探工作量的60～70％左右。不但加快了勘测周期,减轻了劳动强度,而且提高了资料的质量。目前,运用最多的动探仪是重型和超重型两种。它们对碎(卵)石土最为适用。至于粘性土,除标贯外,采用重2型动探尚缺乏资料。而标贯操作费时、费事、清孔、操作等因素对精度影响较大,现场一般又不愿采用。为此,我们对粘性土和粉、细砂采用重2型动探来评价其应力,作了初步探索。
Dynamic probe with its economy, simplicity, short survey cycle, to provide data-based, willing to be used by designers. Since we adopted the dynamic exploration in 1983, Chengdu Bureau of Design now accounts for about 60-70% of the drilling workload. Not only accelerated the survey cycle, reducing labor intensity, but also improve the quality of information. At present, the most widely used hydrometer is both heavy and extra heavy. They are most suitable for broken (egg) stone. As for the cohesive soil, in addition to standard penetration, the use of heavy type 2 dynamic exploration is still lacking information. The standard operating costs and time-consuming, costly, clear hole, the operation and other factors have a greater impact on the accuracy of the site generally reluctant to use. For this reason, we made a preliminary exploration on the evaluation of the stress of cohesive soil, powder and fine sand by using heavy type 2 dynamic exploration.