摘要
对于立性随深度变化的情况，讨论了不排水剪切强度Cu空间变异性的随机场概率统计模型。由于现有的土层随机场模型都是针对平稳随机场，即立性的随机分量的，所以首先要用回归的方法分离出趋势分量来，然后才能对随机分量进行模拟。认为在进行岩土工程可靠度分析时，不仅要考虑抽样所带来的误差，还要考虑立性本身的空间变异性。并用不排水剪强度Cu的变异性来计算粘性土中单桩承载力的方差，旨在阐明随机场理论在岩土工程可靠性分析中的应用。最后用一个算例作了具体说明。
The random field analysis model of the spatial variability of undrained shear strength is discuned on condition that soilproperty is varied lineary with depth. Because the existing soil random field model is ouly aimed at the stable one, i. e.the 'local veriation' of the soil property, so it is needed that the trend component should be obtained using regresion methodbefore modeling the 'local variation'. It is suggested that not only the error term of the sampling , but also the spatial vari-ability of soil itself should be taken into account. To illuminate the application of random field in geotechnical engineering,the variability of undrained shear strength is used to calculate the variance of the bearing capacity of a single pile among clayand to do reliability analysis. At the end of the paper, an example is given t0 explain the application of the method.
出处
《土木工程学报》
EI
CSCD
北大核心
2000年第3期66-70,共5页
China Civil Engineering Journal
基金
国家自然科学基金!59679016
关键词
空间变异性
不排水剪强度
单桩承载力
可靠性
spatial variability, undrained shear strength, regression, bearing capacity, reliability
