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天然黄土动残余应变研究主要依赖室内动三轴试验,如何将有限室内试验数据合理地应用于场地动力沉降的定量评价,是岩土地震工程领域中研究涉足尚少的重要科学问题。应用概率统计与蒙特卡洛模拟等非确定性分析方法,借助综合考虑固结应力、结构强度、空间体积特性和地震动荷载等动残余应变关键影响参量的估算模型,提出有效弱化土体物性参量不确定性(离散性与随机性)的场地动力沉降概率性评价的思路与方法。应用结果显示,利用该方法得出的场地动力沉降的概率分布特征,能够反映天然黄土动残余应变的基本认知特点,对明晰地震作用下天然黄土场地精细动力沉降特性以及据此采用适当合理的地基处理方法,具有理论意义与实用价值。
The study on the dynamic residual strain of natural loess relies mainly on the indoor dynamic triaxial test. How to apply the limited laboratory test data to the quantitative evaluation of the dynamic settlement of the site is an important scientific issue in the field of geotechnical engineering. By means of non-deterministic analysis methods such as probability statistics and Monte Carlo simulation, with the help of comprehensively considering the estimation models of the key influence parameters of residual residual strain such as consolidation stress, structural strength, space volume characteristic and ground motion load, The Uncertainty (Discrepancy and Stochasticity) of the Site Dynamic Settlement Probability Evaluation of the ideas and methods. The application results show that the probability distribution of the dynamic settlement of the site can be used to reflect the basic cognitive characteristics of the dynamic residual loess of the natural loess. Based on the analysis of the fine dynamic settlement characteristics of the natural loess site and the proper and reasonable Ground treatment methods, with theoretical significance and practical value.