摘要
在工程技术领域以可靠性理论为基础的极限状态分析方法能够考虑设计参数的随机性,比以固定安全系数为根据的传统分析方法更为科学,由于在岩土工程中存在大量的不确定和不确知因素,应用可靠性理论解决岩土工程中的问题一直比较困难,但有很好的应用前景.参照现有成果和统计数据,提出了基于可靠性理论的岩土工程参数反分析设计基本过程和方法:建立结构体系的极限状态方程,确定反分析设计参数及其概率分布,并计算设计参数与可靠性指标β的关系,再根据建筑物安全等级或设计要求确定目标可靠性指标β*从而反推出设计参数.最后应用Monte-Carlo方法,说明了基于可靠性理论的刚性桩复合地基面积置换率m的设计以及土坡稳定分析中土性参数的选取.
In the light of the randomicity of design parameter, the analysis of reliability is more scientific than the traditional analysis based on the fixed safety factor within civil engineering scope. Because of many undetermined and unknown factors, the application of reliability theory in geotechnical engineering is difficult but has good prospects. According to the references and statistics, the method of geotechnical parameter inverse analysis design based on the reliability theory was presented here： deriving the limit state equation, determining the inverse design parameter and its distribution, and calculating the relation between reliability index β and design parameter. Then according to the target reliability index β^＊ that derive from safety grade of buildings or design requirement the design parameter value was obtained. Finally, by means Of Monte-Carlo method the process of inverse analysis based on reliability theory was shown in designing the area replacement m of rigid pile composite foundation and in selecting the soil parameter in the course of earth slope stability.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2006年第2期159-162,177,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
关键词
岩土工程
可靠指标
反分析
复合地基
面积置换率
MONTE-CARLO法
土坡稳定
geotechnical engineering
reliability index
inverse analysis
composite foundation, area replacement ratio
Mont
Carlo method
stability of earth slope
