岩土工程可靠度分析中方差折减函数确定的一般规律

发布时间：2018-05-19 23:15

本文选题：随机场理论 + 方差折减函数　；参考：《岩土力学》2014年08期

【摘要】：将可靠度理论应用于岩土工程稳定性分析过程中,即使是已证明安全的工程所得到的边坡或地基的失效概率通常较大,导致这一现象的原因是估算的方差偏大。计算土性指标的试验数据仅表征了该试验点的特征,而不是空间平均特征。在随机场理论应用于岩土工程可靠度分析的过程中,方差折减函数是将点特性过渡为空间平均特性的必要参数。首次对闫澍旺等提出的完全不相关距离理论中完全不相关距离的确定方法进行改进,不但理论上有所突破,而且计算方法更为简洁。对折减函数值的确定过程进行了分析,得到了用完全不相关距离方法确定折减函数的一般规律。
[Abstract]:When the reliability theory is applied to the stability analysis of geotechnical engineering, the failure probability of the slope or foundation obtained by the proven safety engineering is usually high, which is caused by the large variance of the estimation. The experimental data for calculating the soil property index only represent the characteristics of the test point, not the spatial average feature. In the application of random field theory to the reliability analysis of geotechnical engineering, the variance reduction function is the necessary parameter to transfer the point characteristic to the spatial average characteristic. It is the first time to improve the method of determining the completely uncorrelated distance in the completely uncorrelated distance theory put forward by Yan Shu-wang et al. It is not only a breakthrough in theory but also a simpler calculation method. The process of determining the value of the reduction function is analyzed, and the general law of determining the reduction function by the method of completely uncorrelated distance is obtained.
【作者单位】：天津大学建筑工程学院;天津城建大学土木工程学院;中交天津港湾工程研究院有限公司;
【基金】：交通运输部科技项目(No.201132849A1150)
【分类号】：TU43

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