基于随机场理论的江苏海相黏土空间变异性评价研究

发布时间：2019-05-30 01:51

【摘要】：土体空间变异性分析是进行岩土工程可靠度设计的理论基础。采用随机场理论,提出了典型江苏海相黏土的随机场特征及参数,对基于孔压静力触探(CPTU)测试数据的空间变异性进行了系统分析。由于竖直方向上CPTU锥尖阻力数据的样本容量较高,通过对锥尖阻力进行一次多项式去趋势来获得平稳的波动分量,并利用常用的5种自相关模型拟合波动分量的自相关系数。采用修正的Bartlett统计公式来检验波动分量的平稳性,选取最优的竖直波动范围。竖直变异系数由波动分量和去趋势函数来确定。鉴于水平方向上的CPTU锥尖阻力数据的样本容量较小,采用平均零跨距法估计水平波动范围,水平变异系数由总体变异系数来表示。结果表明,竖直向和水平向上江苏海相黏土较报道值显示出更强的空间变异性。
[Abstract]:The analysis of soil spatial variability is the theoretical basis of geotechnical engineering reliability design. Based on the random field theory, the random field characteristics and parameters of typical Jiangsu marine clay are put forward, and the spatial variability of (CPTU) test data based on pore pressure static penetration is systematically analyzed. Because the sample size of CPTU cone tip resistance data in vertical direction is high, the steady wave component is obtained by removing the trend of cone tip resistance in one time, and five kinds of autocorrelation models are used to fit the autocorrelation coefficient of wave component. The modified Bartlett statistical formula is used to test the stationarity of wave components and the optimal vertical fluctuation range is selected. The vertical coefficient of variation is determined by the wave component and the de-trend function. In view of the small sample size of CPTU cone tip resistance data in horizontal direction, the average zero span method is used to estimate the horizontal fluctuation range, and the horizontal variation coefficient is represented by the overall coefficient of variation. The results show that the vertical and horizontal marine clay in Jiangsu Province shows stronger spatial variability than the reported value.
【作者单位】：东南大学岩土工程研究所;江苏省城市地下工程与环境安全重点实验室;
【基金】：国家自然科学基金项目(41202203) 国家科技支撑计划项目(2012BAJ01B02) 全国优秀博士学位论文作者专项资金项目(201353) 江苏省杰出青年基金项目(BK20140027) 教育部新世纪优秀人才支持计划(NCET-13-0118) 中央高校基本科研业务费(2242013R30014)
【分类号】：TU442

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