取样方式对湿陷性土性质的影响探讨
摘要:通过在场地内布置的2处原位静载荷试验，基本查明场地内浅部细粒土的湿陷性特征。对冲击钻机、人工挖探及旋转钻机三种不同来源的土样进行了室内湿陷性试验。试验结果表明，冲击钻机取样的湿陷系数明显降低，分析原因为冲击取样对湿陷性土的密度及压缩模量均影响较大；旋转钻机取样对湿陷性土的含水量具有显著影响，同时由于作业过程中水对土体孔隙的填充，直接导致了土体饱和度和密度的增大。通过分析湿陷系数与密度的关系发现，湿陷系数大小与密度大小呈反相关，并且在密度达到1.90～1.95 g/cm3左右时，场地内的土体基本不再具有湿陷性，该数据对场地处理湿陷性研究与生产具有一定的参考意义。
Abstract:In order to analyze the effect of sampling mode on collapsible soil with strong structure,two collapsibility tests were carried out in the site,and the collapsibility characteristics of shallow fine grained soil in the site were basically identified.The laboratory test was carried out on the soil samples of three different sources of impact drilling rig,artificial digging and rotary drilling rig.The test results show that the impact drill sampling of collapsibility coefficient decreased obviously,analyze the reasons for the impact of sampling has great influence on the collapsible soil density and compression modulus;while rotary drilling sampling has a significant impact on the collapsible soil water content.Because of filling of soil pore by water,directly led to the increase of soil saturation and density.Through the analysis of the relationship between the collapsibility coefficient and the density,the size of collapsibility coefficient is anti-correlation with the size of density,and the density was about 1.90~1.95 g/cm3,the soil in the field no longer has collapsibility.The data have some reference significance for the research and production of collapsibility-treatment.
中文标题：
取样方式对湿陷性土性质的影响探讨
Discussion on the Effect of Sampling Mode on the Properties of Collapsible Soil
作者：
王维理,高光亮,赵佩
Wang Weili,Gao Guangliang,Zhao Pei
作者简介:王维理,男,1978年生,汉族,山西平遥县人,硕士研究生,高级工程师。E-mail:31707353@qq,com
通讯地址：
北京市勘察设计研究院有限公司, 北京 100038
BGIEngineeringConsultantsLtd,Beijing100038,China
中图分类号:P624.4
doi:10.3969/j.issn.1007-2993.2018.06.002
出版物：岩土工程技术
收稿日期:2018-06-12
网络出版日期:2021-07-06
关键词:北京地区,取样方式,湿陷性土
Key words:Beijing area,sampling method,collapsible soil
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