摘要
土石混填路基在我国西部山区已被广泛采用,但由于设计、施工规范不完善,路基经常出现多种形式的病害,降低了公路的服务水平。揭示土石混填路基的变形破坏机理,为设计和施工控制提供依据,本研究采用自动化底摩擦仪,进行了不同填筑形式,不同压实度的土石混填路基的底摩擦试验,再现了路基的变形破坏过程和最终的破坏模式。研究结果表明,土石混填路基的破坏主要源于坡脚失稳和不均匀沉降,最终的破坏模式可归结为路基边坡的滑塌和不均匀沉降导致的路基纵向开裂。对于坡度较小的斜坡路基,通过开挖台阶,可有效地提高路基的稳定性。
Rock-soil filled roadbed is broadly adopted in western mountain areas, it often occur multidisease problems which reduce the service level of the road. To post the deformation and failure mechanism of the rock-soil filled roadbed, and provide basis for design and construction, this study carried floor-friction test through rock-soil filled roadbed with different density, different fill section on robotieized floor-friction instrument, the simulation reappeared the process and the final mode of the roadbed deformation and failure. Test results showed： the root of the rock-soil filled roadbed failure is mostly asymmetry settlement and slope slide, the final failure mode could come down to slope slide and portrait craze caused by asymmetry settlement. Cutting step could effectively improve the stability to those roadbeds which build on small grade floor.
出处
《中南公路工程》
2006年第4期4-8,共5页
Central South Highway Engineering
基金
交通部西部建设科技项目资助(200231800034)
关键词
路基
土石混填
变形破坏
底摩擦
模拟
roadbed
rock-soil filled
deformation and failure
floor-friction
