UH模型对粗颗粒土适用性验证及土石坝工程应用  

Applicability verification of UH model on coarse-grained soil and its application in earth rockfill dam

作　　者：朱俊高[1] 赵晓龙 何顺宾 田雨 ZHU Jun-gao;ZHAO Xiao-long;HE Shun-bin;TIAN Yu(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China;PowerChina Chengdu Engineering Corporation Limited,Chengdu,Sichuan 610072,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,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]中国电建集团成都勘测设计研究院有限公司,四川成都610072 [3]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《岩土力学》2020年第12期3873-3881,共9页Rock and Soil Mechanics

基　　金：国家重点研发计划项目(No.2018YFC1508505);国家自然科学基金(No.U1865104,No.51479052)。

摘　　要：对3种粗颗粒土进行了常规三轴CD试验、K0压缩试验和等应力比路径试验,根据三轴试验数据标定UH(unified hardening,统一硬化)模型的参数,然后模拟另外两种路径下的应力-应变关系,并与邓肯E-B模型进行比较。结果表明:UH模型能合理地描述不同应力路径下粗颗粒土的力学特性,而邓肯E-B模型的预测结果则较差,验证了UH模型对粗颗粒土的适用性。最后利用UH模型对某心墙堆石坝进行了应力变形三维有限元分析,并将计算结果与邓肯E-B模型及现场监测值进行比较。对比显示:在坝体变形和应力的定性分布规律上,UH模型的计算结果与邓肯E-B模型基本一致;而在定量上,UH模型得到的坝体变形总体上更接近现场监测值,验证了UH模型在土石坝工程中的适用性和合理性。K0 compression tests and constant stress ratio path tests were performed on three kinds of coarse-grained soils in conventional consolidated-drained(CD) triaxial tests. Parameters of unified hardening(UH) model were calibrated according to the triaxial test data, and then stress-strain relationships under the other two paths were simulated. The simulation results were compared with those obtained from Duncan’s E-B model. It is shown that UH model can reasonably describe the mechanical behaviors of coarse-grained soil under different stress paths, while Duncan’s E-B model behaves poorly in predicting the results. The applicability of UH model to coarse-grained soil has been verified. Finally, three-dimensional finite element analysis of stress and deformation for a core rockfill dam was performed by using UH model. The calculation results were compared with those of Duncan’s E-B model and the field monitoring data. It is shown that from a qualitative perspective of the distribution of dam deformation and stress, the results obtained from UH model are similar to those from Duncan’s E-B model. However, from a quantitative perspective, the deformation calculated from UH model is overall closer to the field monitoring data. The applicability and rationality of UH model in the field of earth rockfill dam have also been verified.

关 键 词：粗颗粒土 UH模型 邓肯E-B模型 K0压缩试验 等应力比路径试验 土石坝 

分 类 号：TU431[建筑科学—岩土工程]