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Comparison between baseline technique design and partial factor design in slope engineering
Bulletin of Engineering Geology and the Environment ( IF 4.2 ) Pub Date : 2021-02-08 , DOI: 10.1007/s10064-020-02074-5
Lihong Chen , Ning Zhang , Xu Li , Lulu Zhang

In slope engineering, the allowable safety factor design (ASFD) is widely used. However, it includes all sources of uncertainties and does not truly account for risk. Therefore, a more robust design method is required. This study compares the actual reliability levels that ASFD, PFD (partial factor design), and BTD (baseline technique design) provide. The results indicate BTD provides the most stable reliability levels. The major findings are as follows. (1) A sampling strategy is provided to evaluate the performance that ASFD, PFD, and BTD achieve specific target reliability indexes. It provides reliability-based calibration and evaluation. (2) BTD provides more stable reliability levels, especially when the target reliability index is high. (3) The performance of PFD is influenced by the selection of quantile; BTD uses optimal quantiles and achieves the most stable reliability levels. This study provides a numerical investigation of design factors for shear strength parameters, and it uses a sampling strategy considering typical soils from sand to clay. Preliminary results show that BTD is attractive in numerical aspects.



中文翻译:

边坡工程中基线技术设计与局部因子设计的比较

在边坡工程中,允许安全系数设计(ASFD)被广泛使用。但是,它包括所有不确定性来源,并不能真正说明风险。因此,需要一种更可靠的设计方法。这项研究比较了ASFD,PFD(部分因子设计)和BTD(基线技术设计)提供的实际可靠性水平。结果表明BTD提供了最稳定的可靠性级别。主要发现如下。(1)提供了一种采样策略来评估ASFD,PFD和BTD实现特定目标可靠性指标的性能。它提供基于可靠性的校准和评估。(2)BTD提供了更稳定的可靠性级别,尤其是当目标可靠性指标较高时。(3)PFD的性能受分位数的选择影响;BTD使用最佳分位数并达到最稳定的可靠性水平。这项研究为抗剪强度参数的设计因素提供了数值研究,并采用了一种考虑了从沙土到黏土的典型土壤的采样策略。初步结果表明,BTD在数值方面具有吸引力。

更新日期:2021-03-15
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