摘要
Foundation settlement is of great significance for high-fill engineering in collapsible loess areas.To predict the construction settlement of Lüliang Airport located in Shanxi Province,China,a plane strain finite element method considering the linear variation in the modulus,was carried out in this paper based on the results of geotechnical tests.The stress and deformation of four typical sections caused by layered fill are simulated,and then the settlement of the high-fill airport is calculated and analyzed by inputting three sets of parameters.The relative soft parameters of loess geomaterials produce more settlement than the relatively hard parameters.The thicker the filling body is,the greater the settlement is.The filling body constrained by mountains on both sides produces less settlement than the filling body constrained by a mountain on only one side even the filling thickness is almost the same.The settlement caused by the original subbase accounts for 56%−77%of the total settlement,while the fill soils themselves accounts for 23%−44%of the total settlement,which is approximately consistent with the field monitoring results.It provides a good reference for predicting the settlement of similar high-fill engineering.
湿陷性黄土地区高填方工程的地基沉降是一个重要问题。为了预测中国山西吕梁机场施工期的沉降,本文基于岩土试验结果,采用了考虑模量线性变化的平面应变有限元法,模拟了四个典型断面分层填筑引起的应力和应变变化,并通过输入三套参数计算和分析高填方机场的沉降。结果表明,相对“软”的黄土参数比相对“硬”的参数引起的沉降更大;填筑体越厚,沉降越大;填筑体厚度接近相同时,两侧受山体约束的填筑体产生的沉降小于一侧受山体约束的填筑体产生的沉降;原地基引起的沉降占总沉降的56%~77%,填筑体引起的沉降占总沉降的23%~44%,与现场监测结果吻合性较好。该研究对相似高填方工程沉降的预测提供了借鉴和参考。
作者
JIE Yu-xin
WEI Ying-jie
WANG Du-li
WEI Yi-feng
介玉新;魏英杰;王笃礼;魏弋锋(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;AVIC Institute of Geotechnical Engineering Co.,Ltd.,Beijing 100098,China;China Airport Construction Group Corporation of CAAC,Beijing 100101,China)
基金
Project(2020M670604)supported by the China Postdoctoral Science Foundation
Project(41790434)supported by the National Natural Science Foundation of China。
