渭河中砂地层工程特性随深度变化规律试验研究  

Experimental study on the variation of engineering characteristics with depth of medium sand in Weihe River

作　　者：李铸卿 康佐 刘艺 张鑫 朱才辉[1] Li Zhuqing;Kang Zuo;Liu Yi;Zhang Xin;Zhu Caihui(Institute of Geotechnical Engineering,Xi′an University of Technology,Xi′an 710048,China;Xi′an Rail Transit Group Company Limited,Xi′an 710016,China;China Jikan Research Institute of Engineering Investigations and Design,Co.,Ltd.,Xi′an 710043,China)

机构地区：[1]西安理工大学岩土工程研究所,西安710048 [2]西安市轨道交通集团有限公司,西安710016 [3]机械工业勘察设计研究院有限公司,西安710043

出　　处：《工程勘察》2024年第8期1-6,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(52279110,52108339,52178355);陕西省重点研发计划项目(2022SF-197).

摘　　要：以西安渭河某合建桥工程为例,基于室内试验和现场原位试验,开展了原状和重塑渭河中砂的物理性质、细观结构特征、强度特性及标贯试验。深入分析了抗剪强度随深度的关系和细粒含量及标贯击数对抗剪强度的影响,得到了其经验关系。结果表明:黏聚力随着深度的增加而减小,内摩擦角随着深度的增加而增加。原状砂土的抗剪强度大于重塑砂土。内摩擦角随标贯击数的增大呈线性增加的趋势。通过大量室内试验和原位测试结果得到了渭河中砂地层工程特征参数,可为类似工程的设计、施工提供参考。A case study of a bridge construction over Weihe River in Xi′an were carried out on the aspects of physical properties,meso-structural characteristics,strength characteristics and standard penetration tests of undisturbed and remoulded medium sand based on laboratory tests and in-situ tests.The relationship between shear strength with depth,the influence of fine particle content and standard penetration blows on shear strength were analyzed,and the empirical relationship was obtained.The results show that the cohesion decreases with increasing depth,and the internal friction angle increases with increasing depth.The shear strength of undisturbed sand is greater than that of remoulded sand.The internal friction angle shows a linear increasing trend with the increase of the number of standard penetration blows.The engineering characteristic parameters of medium sand in Wei River obtained through a large number of laboratory tests and in-situ tests can provide reference for the design and construction of similar projects.

关 键 词：渭河中砂 抗剪强度 室内试验 原位试验 细粒含量 标贯击数 

分 类 号：TU413[建筑科学—岩土工程]