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AN ASSESSMENT OF THE GEOTECHNICAL STRENGTH REDUCTION FACTORS SPECIFIED IN THE NEW AUSTRALIAN PILING STANDARD

机译:新的澳大利亚打桩标准中规定的岩土强度折减系数的评估

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摘要

The two most common forms of pile load testing currently used in practice are the Static Load Test (SLT) and High Strain Dynamic Load Test (DLT). The Australian Piling Standard AS2159 applies a geotechnical reduction factor (?_g) to the load capacities obtained from these tests to derive the pile's design ultimate geotechnical strength. However, recommendations for assessment of ?_g in the current (2009) edition of AS2159 differ significantly from those in the previous 1995 edition. This paper investigates differences in ?_g that are related to the method of pile testing by examining the reliability of load capacity predictions from DLTs with respect to the capacity measured in a SLT. It is shown that the increased ?_g value allowed by AS2159 (2009) for dynamic testing may be un-conservative compared to the corresponding increase allowed for static load testing.
机译:当前实际使用的两种最常见的桩载荷测试形式是静态载荷测试(SLT)和高应变动态载荷测试(DLT)。澳大利亚打桩标准AS2159将岩土折减系数(?_g)应用于从这些测试中获得的负载能力,以得出桩的设计极限土力强度。但是,当前(2009年版)的AS2159中对_g进行评估的建议与1995年以前的版本存在显着差异。本文通过检查DLT相对于SLT中测得的承载能力预测的可靠性,研究了与桩测试方法有关的Δ_g差异。结果表明,与静态负载测试允许的相应增加相比,AS2159(2009)允许用于动态测试的增加的_g值可能不保守。

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