机场软土地基次固结沉降特性与预测  

Settlement Characteristics and Prediction of Soft Soil Foundation During Consolidation Stage

作　　者：云海浪 韩文喜[2] 徐俊 李宝成 胡伦俊 YUN Hailang;HAN Wenxi;XU Jun;LI Baocheng;HU Lunjun(College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;China Southwest Geotechnical Investigation&Design Institute Co.Ltd.,Chengdu 610059,China)

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [3]中国建筑西南勘察设计研究院有限公司,成都610059

出　　处：《河南科学》2020年第11期1814-1822,共9页Henan Science

基　　金：国家重点基础研究发展973计划项目(2014CB047003)。

摘　　要：软土地基的稳定性对机场建设非常重要,地基的工后沉降以及不均匀沉降过大都会导致机场跑道的开裂.以成都新机场为例,通过次固结试验研究该软土次固结特性,得出压缩指数Cc与次固结系数Ca成良好的线性关系,Ca/Cc的值在0.021~0.1之间;次固结系数Ca随着压力逐渐增大,固结压力在400~800 kPa时Ca增长最快,之后趋于某定值.基于长期监测数据,在次固结预测模型的基础上采用改良Buisuman模型对机场工后30年沉降进行预测,将其预测值和有限元数值预测值对比分析,得出改良Buisuman模型和Plaxis数值模拟均适合西南地区软土的长期变形时沉降预测.The stability of soft soil foundation is very important for airport construction.The post-construction settlement and uneven settlement of the foundation lead to the cracking of airport runway.Take chengdu’s new airport for example,secondary consolidation characteristics of soft soil were studied by secondary consolidation test.A good linear relationship was found between compression index Cc and secondary consolidation coefficient Ca,and the value of Ca is 0.021-0.1.The secondary consolidation coefficient Ca increases gradually with the pressure,and the consolidation pressure increases the fastest at 400-800 kPa,and then tends to a certain value.Based on the long-term monitoring data,the modified Buisuman model was used to predict the settlement after 30 years of construction on the basis of the secondary consolidation prediction model,and its predicted value and the predicted value of the finite element value were compared and analyzed,and it was concluded that both the improved Buisuman model and Plaxis numerical simulation were suitable for the settlement prediction of soft soil during long-term deformation.

关 键 词：软土地基 长期沉降 次固结计算 数值模拟计算 

分 类 号：TU470[建筑科学—结构工程]