低能级强夯前后路基黄土湿陷性研究  

Subgrade loess collapsibility before and after low level tamping

作　　者：颜斌[1] 徐张建 

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]西北综合勘察设计研究院,陕西西安710054

出　　处：《长安大学学报（自然科学版）》2009年第4期25-29,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200131836115);国家自然科学基金项目(40471023)

摘　　要：为了研究低能级强夯处治湿陷性黄土路基的有效性和经济性，采用土工试验、粒度分析仪和扫描电镜，对比分析了压实前后黄土的物理力学参数、粒度组成、胶结类型和微结构。研究结果表明：土体物理力学性质随能级的增大变化明显，粘粒含量增加较多，胶结类型由胶结、微胶结转变成半胶结类型；微结构由絮凝状、支架大孔以及镶嵌结构转变为镶嵌结构与叠置结构；低能级强夯的有效影响深度为2．0～2．5m，2m深度内黄土湿陷性基本消除。In order to research whether the low level tamping treatment is economical and effective to collapsible loess, the physical and mechanical parameters, granularity composition, cement type and microstructure were studied with scanning soil tests, particle size analyzer and scanning electron microscopy. It is found that physical and mechanical properties, clay content increase with the increasing of power level significantly, cemented and micro-emented types transform into half cemented type, the microstructure by the flocculation shape, the support pocket as well as the mosaic transform into the mosaic and the superposition structure. The results show that the effective impact depth is from 2.0 m to 2. 5 m, collapsibility is basically eliminated within 2m depth. 1 tab, 8 figs, 7 refs.

关 键 词：道路工程 黄土路基 低能级强夯 湿陷性 颗粒分析 胶结类型 微结构 

分 类 号：U416.169[交通运输工程—道路与铁道工程]