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首页> 外文会议>Geotechnical Special Publication no.129; Geo-Frontiers Conference; 20050124-26; Austin,TX(US) >Use of In Situ Tests to Design Drilled Shafts in Dense and Cemented Soils
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Use of In Situ Tests to Design Drilled Shafts in Dense and Cemented Soils

机译：使用原位测试设计稠密和胶结土壤中的钻杆

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摘要

In the desert southwest of the United States (Arizona and parts of New Mexico, California, Nevada, Utah and Colorado), the soils are often dense and cemented. The design procedures for drilled shafts described by the American Association of State Highway and Transportation Officials (AASHTO) or the Federal Highway Administration (FHWA) do not incorporate the effect of density or cementation. Use of β-α methods cited in these publications often result in an over-design of the drilled shafts with associated greater costs. The FHWA (1999) publication by O'Neill and Reese suggests classifying dense or stiff soils as intermediate geomaterials (IGMs) and proposes alternative design methodology. Based on results of the recent large-scale load tests in Arizona reported in this paper (2.44 m diameter test shaft) and the results of tests in New Mexico described by Chua et al. (2000) (1.37 and 1.83 m diameter test shafts), it appears that the actual skin friction in desert southwest soils is much higher than that predicted by the equations for IGMs. This paper presents the results of the test program performed for the Arizona Department of Transportation (ADOT) that included a large scale load test on a 2.44 m diameter, 41.1 m deep shaft to re-design large diameter drilled shaft foundations for the I-10/I-19 Traffic Interchange (TI) in Tucson, Arizona. The methodology implemented on this successful project may be useful for future projects in dense and variably cemented soils.
机译：在美国西南部的沙漠中（亚利桑那州和新墨西哥州，加利福尼亚州，内华达州，犹他州和科罗拉多州的部分地区），土壤通常稠密且胶结。美国国家公路和运输官员协会（AASHTO）或联邦公路管理局（FHWA）所述的钻探井筒设计程序未考虑密度或胶结作用。这些出版物中引用的β-α方法的使用通常会导致钻杆的过度设计，并带来更高的成本。 O'Neill和Reese出版的FHWA（1999）建议将稠密或坚硬的土壤分类为中间土工材料（IGM），并提出替代设计方法。基于本文报道的最近在亚利桑那州进行的大规模负载测试（直径为2.44 m的测试轴）的结果以及Chua等人在新墨西哥州的测试结果。 （2000年）（直径为1.37和1.83 m的测试轴），似乎在西南沙漠中的实际皮肤摩擦力比IGMs方程预测的要高得多。本文介绍了针对亚利桑那州交通运输部（ADOT）执行的测试程序的结果，其中包括对直径2.44 m，深41.1 m的竖井进行大规模载荷测试，以重新设计I-10的大直径钻孔竖井基础/ I-19亚利桑那州图森市的交通交汇处（TI）。在这个成功的项目上实施的方法学可能对于将来在稠密且水泥含量不同的土壤中的项目很有用。

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