高填方地基粘弹性参数反演及工后沉降分布规律预测  

Parameter Inversion of High Fill Foundation and Prediction of Post Construction Settlement Distribution

作　　者：樊朱益 王启贵 卞夏[1] 吴忠明 袁俊平[1] Fan zhuyi;Wang Qigui;Bian Xia;Wu Zhongming;Yuan Junping(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,Jiangsu,China;Zhejiang Huadong Surveying and Engineering Safety Co.,Ltd.,Hangzhou,310014,Zhejiang,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]浙江华东测绘与工程安全技术有限公司,浙江杭州310014

出　　处：《岩土工程技术》2023年第2期147-153,共7页Geotechnical Engineering Technique

基　　金：中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金课题(SKLGDUEK2114)。

摘　　要：云南巧家高填方工程场地地形崎岖,高差悬殊,存在工后沉降量大以及不均匀沉降等问题,而传统沉降预测方法因忽略参数差异性问题不能准确预测高填方场地工后沉降。基于云南巧家高填方工程30组实测沉降数据,采用粘弹性模型、指数模型和双曲线模型三种方式进行工后沉降预测,结果显示粘弹性模型对于高填方沉降预测精度明显优于其他两种模型。基于粘弹性模型预测了云南巧家高填方工程工后沉降分布规律,探明了最大沉降速率和最终沉降的分布区域,为后续开展工程措施提供了合理的科学依据。通过粘弹性本构模型参数反演发现云南巧家高填方工程回填材料的压缩模量和粘滞系数均呈现显著的空间差异性,若不考虑参数空间差异性将会导致预测结果产生显著的误差。基于此提出了高填方场地考虑参数变异性的分区计算方法,该方法不仅能够减少整个高填方场地计算参数,并且能够有效提升预测结果精度,从而满足工程需求。The terrain of Qiaojia high fill project site in Yunnan Province is rugged and the height difference is wide.There will be problems such as large post construction settlement and differential settlement.The current calculation methods for high fill settlement,such as theoretical calculation method and numerical simulation method,need parameter input,and high fill will cause parameter spatial variability due to the source of filling materials and construction technology.The errors between the prediction results of viscoelastic model,exponential model and hyperbolic model and 30 groups of measured settlement data were compared.The results show that the prediction accuracy of viscoelastic model for high fill settlement is obviously better than the other two models.The viscoelastic model was used to predict the post construction settlement distribution law of Yunnan Qiaojia high fill project,and the distribution area of maximum settlement rate and final settlement was proved,which provided a reasonable scientific basis for subsequent engineering measures.The compression modulus and viscosity coefficient of backfill materials of Yunnan Qiaojia high fill project retrieved based on viscoelastic constitutive model show significant spatial variability.If the spatial variability of parameters is not considered,significant errors will be generated in predicting post construction settlement.By meshing the monitoring areas,it can effectively improve the accuracy of prediction results to meet the engineering requirements.

关 键 词：高填方 参数反演 空间差异性 沉降预测 

分 类 号：TU433[建筑科学—岩土工程]