基于地质统计学方法的孔压静力触探锥尖阻力固有空间变异性研究

发布时间：2018-10-24 15:41

【摘要】：地质统计学是用于模拟土体固有空间变异性的方法之一,以变差函数为工具,采用Kriging插值提供未采样点处土工参数值的最优线性无偏估计。将地质统计学方法应用于宿-新(宿迁至新沂)高速公路某试验段内孔压静力触探(piezocone penetration test,CPTU)锥尖阻力qt空间变异性研究中,采用回归分析移除数据中的趋势项,从而获得具有弱平稳性的残差数据。指数型理论变差函数能够准确描述试验段内土体的连续空间变异性特征。根据估计结果,试验段内锥尖阻力qt残差的变程具有显著各向异性,在水平方向和竖直方向分别为4.05 m和1.2 m。采用普通Kriging插值结合趋势分析,绘制了qt在试验段的空间分布图和平面投影图,用于指导工程实践。结果表明,普通Kriging插值的估计结果能够与试验段内实测资料形成较好的对比,仅仅在部分极值变化和远离采样点的位置处估计值可靠性会降低。
[Abstract]:Geostatistics is one of the methods used to simulate the inherent spatial variability of soil mass, using the variation function as a tool, and using Kriging interpolation to provide the optimal linear unbiased estimate of the geotechnical parameter values at the unsampled points. In this paper, the method of geostatistics is applied to the study of the cone tip resistance (qt) space variability of a cone tip resistance (CPTU) cone tip resistance (qt) in a certain area of a residential-new (Suqian-Xinhui) highway, and the trend term in the data is removed by regression analysis, thus obtaining residual data with weak stationarity. The exponential type theory variation function can accurately describe the continuous spatial variability of soil in the soil. According to the estimation result, the variable range of the cone tip resistance qt residual has a significant anisotropy, which is 4.05m and 1.2m in the horizontal and vertical directions respectively. The spatial distribution map and the plane projection of the qt are plotted using the ordinary Kriging interpolation trend analysis. It is used to guide engineering practice. The results show that the estimation result of the ordinary Kriging interpolation can be compared with the measured data in the sampling point, and the reliability of the estimation value can be reduced only at the partial extreme value change and the position far from the sampling point.
【作者单位】：东南大学岩土工程研究所;
【基金】：国家自然科学基金(No.41330641,No.41202203) 国家科技支撑计划项目(No.2012BAJ01B02) 教育部新世纪优秀人才支持计划(No.NCET-13-0118) 江苏省杰出青年基金(No.BK20140027) 全国优秀博士学位论文作者专项资助项目(No.201353) 中央高校基本科研业务费(No.2242013R30014)
【分类号】：TU41

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