陕北黄土土性指标相关距离影响因素研究

针对陕北地区分布广泛的Q2黄土层，结合设计资料，选取吴起至定边高速公路沿线典型试验场地进行室内和现场静力触探试验。基于室内试验获得的黏聚力值，采用递推空间法计算土体垂直向相关距离为1.146 m，水平向相关距离为25.530 m。基于大量静力触探试验数据，研究样本数量和取样间距对相关距离的影响，结果表明:当取样间距一定时，相关距离随样本数量的增加而增大，不断接近实际相关距离并趋于平稳；当样本数量一定时，取样间距的变化对相关距离影响很小，当取样间距大于1.100 m时，相关距离突然增大，计算结果已失真。

Research on Influence Factors of Correlation Distance on Loess Soil Index in North of Shanxi

Aiming at Q2 loess widely distributed in north of Shanxi, combining with design data, chose typical test field in highway engineering from Wuqi to Dingbian county to conduct laboratory tests and cone penetration test. Based on the cohesive force value obtained by the laboratory tests, use recurrence space average method to calculate the vertical and horizontal correlation distance of soil are 1.146 m and 25.530 m respectively. Based on a large number of CPT data, study the influence of sample size and sampling interval on the correlation distance. The results show that when the sampling interval is constant, the correlation distance increases as the number of samples increase, keeping close to the actual correlation distance and tend to be stationary. When the sample size is constant, the change of sampling distance has little influence on the correlation distance, when the sampling interval is greater than 1.100 m, the correlation distance suddenly increases and the calculation result has been distorted.