陕北黄土土性指标相关距离影响因素研究  

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

作　　者：宋政群 张兴明 周志军[3] SONG Zhengqun;ZHANG Xingming;ZHOU Zhijun(Yunnan Province Highway Development and Investment Co.,Ltd.,Kunming 650200,China;CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China;Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang an University,Xi'an 710064,China)

机构地区：[1]云南省公路开发投资有限责任公司,昆明650200 [2]中交第四航务工程勘察设计院有限公司,广州510230 [3]长安大学特殊地区公路工程教育部重点实验室,西安710064

出　　处：《路基工程》2018年第2期117-121,共5页Subgrade Engineering

摘　　要：针对陕北地区分布广泛的Q_2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。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.

关 键 词：Q2黄土 样本间距 相关距离 土性指标 递推空间法 

分 类 号：TU473.1[建筑科学—结构工程]