摘要
对娄新高速公路路基场区岩溶塌陷分布发展规律及产生机理进行研究,阐明近期塌陷区形成的原因。采用有限元法研究了岩溶塌陷地基在路基荷载作用下的应力分布及采用连续配筋混凝土板跨越路基下塌陷时板的应力分布,为连续板的配筋设计提供参考。根据路基在该段的填筑情况,计算路基工程对地基的影响深度为15 m,15 m以下的溶洞对路基工程稳定性的影响可不考虑,结合地下塌陷向地表的传递规律提出预测塌陷的土洞最大可能深度的方法。根据分析结果提出了该段岩溶路基的处治方案。
The occurrence mechanism and development rule of karst and subsidence foundation in Lou - Xing freeway were studied and the ground subsidence happened recently was induced by shallow -hidden soil cave. Stress distribution caused by the subgrade loads in the karst and subsidence foundation and in the continuous reinforced concrete plate which was used to treat the collapse cave below the subgrade was anaIyzed by finite element method, which can provide reference for the continuous reinforced concrete plate design. According to the subgrade filling case, the influence depth of subgrad was computed, which is about 15 m. Therefore, it is considered that the s engineering have little influence on the karst cave below the depth of 15 m. Combined with the transfer law of underground subsidence to ground surface, the method to predict maximum depth of cave collapse was put forward. Finally treatment methods of the karst and subsidence foundation was proposed accord- ing to analysis results.
出处
《铁道科学与工程学报》
CAS
CSCD
2009年第6期33-38,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(50708116)
湖南省交通厅科技进步与创新计划项目(200810)
关键词
岩溶塌陷地基
土工格栅
连续配筋混凝土板
karst -subsidence foundation
geogrid
continuous reinforced concrete plate
