摘要
结合成都天府国际机场工程,在工程监测资料的基础上用次固结沉降预测模型、曲线拟合法以及PLAXIS数值计算法对机场软土地基的工后沉降进行预测。结果表明,次固结的双曲线模型与机场数据拟合度较低,变化稳定的监测数据越多,预测值越精确。双曲线法拟合结果与实际监测数据很吻合,差值在0.7~10.2 mm,可预测机场的工后30年沉降量。利用PLAXIS数值软件对机场软土地基进行二维数值计算,计算结果与监测曲线进行拟合,拟合后误差在±20 mm,误差占比为0.38%~4.34%。次固结沉降预测模型中改进的Buisuman模型计算值和PLAXIS数值计算值普遍要比曲线拟合法计算值更精确。
Combined with the Chengdu Tianfu International Airport project,the post-construction settlement of the airport’s soft soil foundation was predicted based on the project monitoring data using the secondary consolidation hyperbolic model,curve fitting method and PLAXIS numerical calculation method.The results show that the hyperbolic model of secondary consolidation has a low degree of fit with airport data,and is not suitable for the calculation of secondary consolidation settlement of airports.The hyperbolic method in the curve fitting method is used to predict the 30-year post-construction settlement of the airport.The fitting results are in good agreement with the actual monitoring data,and the difference is between 0.7 and 10.2 mm.The PLAXIS numerical software is used to perform the two-dimensional numerical calculation on the airport soft soil foundation,and the calculation result is fitted with the monitoring curve.After fitting,the error is within±20 mm,and the error ratio is 0.38%to 4.34%.In the hyperbolic model,the calculated values of the improved Buisuman model and the PLAXIS numerical calculations are generally more accurate than those of the curve fitting method.The secondary consolidation hyperbolic model is more reliable than the curve fitting calculation when calculating the long-term deformation of soft soil.The degree is high.
作者
徐俊
韩文喜
张杰
胡伦俊
李宝成
XU Jun;HAN Wenxi;ZHANG Jie;HU Lunjun;LI Baocheng(College of Environment and Civil Engineering,Chengdu 610059,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu 610059,China;China Southwest Survey and Design Research Institute of Architecture,Chengdu 610059,China)
出处
《土木工程与管理学报》
2021年第5期140-146,共7页
Journal of Civil Engineering and Management
基金
国家重点基础研究发展计划(973计划)(2014CB047003)。
关键词
软土地基
长期变形
数值计算
曲线拟合
次固结计算
soft soil foundation
long-term deformation
numerical calculation
curve fitting
secondary consolidation calculation
