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首页> 外文会议>Conference on the art of foundation engineering practice >Effects of Gravels, Cobbles, and Boulders on Drilled Shaft Capacity Cypress Avenue Bridge, Redding, California
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Effects of Gravels, Cobbles, and Boulders on Drilled Shaft Capacity Cypress Avenue Bridge, Redding, California

机译：砾石，鹅卵石和巨石对钻井能力赛普拉斯大道桥，雷丁，加利福尼亚州的影响

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摘要

Drilled shaft capacity computations are routinely performed by geotechnical professionals using the Alpha and Beta methods outlined in the Federal Highway Administration (FHWA) Publication FHWA-IF-99-025. For cohesionless intermediate geomaterials, the analysis relies heavily upon the Standard Penetration Test sampler blowcounts obtained from exploratory borings. In the presence of alluvial gravel, cobble and boulder deposits, such evaluation cannot be reliably performed. This paper presents information obtained from Osterberg Cell load testing of 2.5 meter (98-inch) diameter shafts advanced using the casing oscillator method at the Cypress Avenue Bridge over the Sacramento River in Redding, California. The relationships between side shear transfer, end bearing, and settlement in cobble and boulder rich deposits with various matrix materials and degrees of weathering are demonstrated. The effects of particle dilation in the development of shaft side resistance and zones of higher stress concentration are also discussed. The results of instrumented pile load testing are compared with the results of drilled shaft capacity estimates made using the FHWA methods in an effort to better correlate field performance with analytical methods.
机译：钻井轴容量计算由使用联邦公路管理（FHWA）公开FHWA-IF-99-025中概述的alpha和β方法进行岩土专业人士进行。对于无荫的中间地岩石材料，分析严重依赖于从探索性硼管获得的标准渗透试验采样器Blowcounts。在发生冲积砾石，鹅卵石和巨石沉积物的情况下，不能可靠地进行这种评估。本文介绍了从萨克拉门托河上的萨克拉门托河上的赛斯凯振荡器方法，从萨克拉门托河上的套管振荡器方法提供了2.5米（98英寸）直径轴的信息。侧剪切转移，末端轴承和褶皱沉积物之间的关系，具有各种基质材料和耐候程度的褶皱和巨石的沉积物。还讨论了粒子扩张在轴侧电阻和较高应力浓度的区域中的影响。将仪表桩载荷测试的结果与使用FHWA方法进行的钻井轴容量估计结果进行了比较，以便更好地与分析方法相关的现场性能。

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