湿陷性黄土地区公路涵洞地基变形特性研究

发布时间：2018-05-31 13:00

本文选题：湿陷性黄土 + 涵洞　；参考：《长江科学院院报》2017年06期

【摘要】：黄土的特殊工程性质,导致其所在地区公路涵洞病害时有发生。为了解决湿陷性黄土地区不良地基导致的涵洞工后沉降过大的问题,以青海民和—小峡一级公路湿陷性黄土地区的2座涵洞为例,分别采用灰土换填法和灰土挤密桩法对这2座涵洞地基进行处理,地基处理后对这2座涵洞进行为期1 a的沉降监测。结果表明:采用灰土换填法和灰土挤密桩法1 a累计沉降量分别为25.0 mm和18.2 mm,灰土换填法和灰土挤密桩法都能有效消除涵洞地基因浸水而引起的湿陷变形,较大幅度地提高地基承载力。地基处理1 a后沉降趋于稳定,与灰土换填法相比,灰土挤密桩法对降低压缩变形、提高地基承载力更加有效。研究成果可为湿陷性黄土地区公路涵洞的设计施工提供参考。
[Abstract]:The special engineering property of loess leads to the disease of culvert in the region. In order to solve the problem of excessive settlement of culvert caused by poor foundation in collapsible loess area, taking two culverts in the collapsible loess area of Minhe-Xiaoxia first class highway in Qinghai as an example, The foundation of the two culverts was treated by the lime soil replacement method and the lime-soil compaction pile method respectively. The settlement of the two culverts was monitored for one year after the foundation treatment. The results show that the accumulative settlement of lime soil replacement method and lime-soil compaction pile method are 25.0 mm and 18.2 mm respectively in 1 year. Both lime-soil replacement method and lime-soil compaction pile method can effectively eliminate the collapsing deformation caused by gene immersion in culverts. The bearing capacity of the foundation is greatly increased. After 1 year of foundation treatment, the settlement tends to be stable. Compared with the lime soil replacement method, the lime-soil compaction pile method is more effective in reducing the compression deformation and increasing the bearing capacity of the foundation. The research results can provide a reference for the design and construction of highway culverts in collapsible loess area.
【作者单位】：兰州交通大学土木工程学院;中铁西北科学研究院有限公司;青海省交通科学研究院;
【基金】：青海省交通科技项目(2014-10)
【分类号】：U449

【相似文献】