黄土掺量对河道粉砂力学性能改良研究  

Study on improvement of mechanical properties of silt in river channel by loess content

作　　者：闫傲坤 李芒原 李国超 杨正仓 毛海涛[1,3] YAN Aokun;LI Mangyuan;LI Guochao;YANG Zhengcang;MAO Haitao(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830000,Xinjiang,China;China Construction Seventh Bureau First Construction Co.,Ltd.,Taiyuan 030000,Shanxi,China;College of Urban and Rural Construction,Shanxi Agricultural University,Taiyuan 030600,Shanxi,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830000 [2]中建七局第一建筑有限公司,山西太原030000 [3]山西农业大学城乡建设学院,山西晋中030600

出　　处：《水利水电技术(中英文)》2024年第11期202-211,共10页Water Resources and Hydropower Engineering

基　　金：国家自然科学青年基金项目(42207102);山西省自然科学基金面上项目(202103021224151;202103021223132);山西农业大学省改革高层次人才引进项目(2021XG009)。

摘　　要：【目的】为探究黄土掺量对河道粉砂物理力学特性的影响规律,达到改良砂土的目的,【方法】结合山西省晋中市太谷区道路工程面临的实际问题,开展一系列室内试验,探究不同黄土掺量和含水量对河道粉砂的物理特性、抗剪强度、渗透性等的影响。【结果】结果显示:粉砂渗透系数随着黄土掺量增加而下降,且幅度逐渐趋于平缓,临界水力坡降逐渐提高;抗剪强度随着黄土掺量增加而上升,随含水率的增加而下降,当黄土掺量为15%、含水率为9%时会出现一个临界值。【结论】结果表明:黄土掺量会影响粉砂的最大干密度、孔隙比和相对密度,使得土体压实度指标明显改善,有利于地基土体的压实度和承载力提升。考虑到工程成本问题和当地实际情况,建议将黄土掺量设定为15%,能达到改良粉砂的目的。[Objective]In order to explore the law of influence of loess content on physical and mechanical characteristics of river silt and achieve the purpose of improving sandy soil,[Methods]combined with the practical problems faced by road engineering in Taigu District,Jinzhong City,Shanxi Province,a series of laboratory tests were carried out to explore the effects of different loess content and water content on the physical characteristics of river silt,shear strength,permeability and so on.[Results]The results showed that the silt permeability coefficient decreased with the increase of loess content,and the range gradually tended to be gentle,and the critical hydraulic slope gradually increased.The shear strength increases with the increase of loess content and decreases with the increase of water content.A critical value occurs when the loess content is 15%and the water content is 9%.[Conclusion]The results show that the loess content can affect the maximum dry density,pore ratio and relative compactness of silt,which significantly improves the soil compaction index and is conducive to the improvement of soil compaction and bearing capacity.Considering the cost of the project and the actual situation of the local area,it is suggested to set the loess content at 15%,which can achieve the purpose of improving the sandy soil.

关 键 词：粉砂 黄土掺量 含水率 抗剪强度 渗透系数 影响因素 

分 类 号：TU441.3[建筑科学—岩土工程] TU411.3[建筑科学—土工工程]