摘要
利用能够在超重力离心环境下旋转的模型箱,进行了山谷型垃圾填埋场离心模型试验。试验结果表明,在40g离心加速度的条件下,前坡40°,后坡45°的填埋场在坡肩处变形较大,沿底部界面失稳的可能性较小。当模型箱转动11.6°(对应填埋体前坡51.6°,后坡56.6°,底坡11.6°),填埋体开始出现整体滑移,随着模型箱的转动角度不断增大,整体滑移呈加速趋势,并伴随有填埋体本身的大变形,其中垂直坡底方向的变形大于平行坡底方向。当模型箱旋转26°后(对应填埋体前坡66°,后坡71°,底坡26°),破坏模式由整体滑移变为沿填埋体内部滑移破坏。试验再现了垃圾堆体沿衬垫界面失稳过程,为山谷型填埋场衬垫界面参数取值方法提供数据支撑。基于测量数据、分析了垃圾土变形、破坏发展规律,探讨了垃圾土抗剪强度参数取值的主要影响因素。
The process of valley‐type solid waste landfill sliding was simulated in centrifugal model test using container rotated during the centrifuge flight In the test ,the displacement of the slope was measured and analyzed . The results showed that large deformation occured in the shoulder of the slope when the front slope angle and the back slope angle reached 40 degree and 45 degree respectively at centrifuge acceleration of 40g .The overall sliding appeared when the front and back slope angels were 51.6 degree ,56.6 degree respectively ,and the interface slope angle at the bottom was 11.6 degree .With the increase of rotation angle of the model ,the trend of overall sliding was accelerated and there was a large deformation of landfill body as well .The deformation perpendicular to the bottom of the slope was larger than that parallel to the bottom .When the model rotated 26 degree with the front and back slope angel of 66 degree ,71 degree ,respectively ,the interface slope angle at the bottom was 26 degree , and the failure mode changed from sliding inside the landfill to sliding along the internal interface slopes . The process of waste body sliding along the liner interface was recreated in the test and this process supported the method of choosing liner parameters in stability analyses .Based on measured data ,the deformation and destruction characteristic were analyzed ,and the main influence factors in selecting the waste shear strength parameter were discussed .
出处
《土木建筑与环境工程》
CSCD
北大核心
2014年第6期67-72,共6页
Journal of Civil,Architectural & Environment Engineering
基金
国家重点基础研究发展计划(973计划)(2012CB719803
2014CB047000)
