基于空间随机场理论的邓肯-张E-B模型参数敏感性研究
Research on Parameter Sensitivity of Duncan-Chang E-B Model Based on Spatial Random Field Theory
相彪 1项甘雨 1杨连斌 1郭辉1
作者信息
- 1. 云南农业大学水利学院,云南 昆明 650201
- 折叠
摘要
在土石坝工程中由于现场施工碾压的不确定性、料场取料的不均匀性导致坝料的力学参数在坝体空间上存在着变异性,这会使得采用确定参数的传统土石坝预测分析结果与坝体实际的应力变形性状存在差异.参考已建工程的坝料土工试验结果,引入空间随机场理论,通过构建平稳随机场进行坝体三维静力分析,获得了邓肯-张E-B模型各力学参数对坝体沉降及水平位移的影响状况,研究了邓肯-张E-B模型各力学参数的敏感性问题,并给出了敏感性排序结论.结果表明,邓肯-张E-B模型中参数Kb、K、φ0 对坝体变形的影响较大,其中以参数Kb的影响最为明显,参数n、Rf的影响次之,而参数Δφ、m较不敏感.研究结论可为土石坝坝体变形的合理预测和坝料特性研究提供参考.
Abstract
In earth-rock dam projects,due to the uncertainty of on-site construction compaction and the non-uniformity of material collec-tion in the material field,the mechanical parameters of dam materials have variability in dam body,which leads to the differences between the conventional prediction analysis results of earth-rock dam using deterministic parameters and the actual stress and deformation behaviors of dam body.In this paper,based on the geotechnical test results of dam materials in the built engineering,the spatial random field theory is introduced,and the 3D static analysis of the dam body is carried out by constructing stationary random fields.The influence of the mechani-cal parameters of Duncan-Chang E-B model on the settlements and horizontal displacements of dam body is obtained.The sensitivity of the mechanical parameters of Duncan-Chang E-B model is studied,and the sensitivity ranking conclusion is given.The results show that the parameters Kb,K and φ0 in Duncan-Chang E-B model have great influence on the deformation of dam body,among which the influence of parameter Kb is the most obvious,followed by the influence of parameters n and Rf,while the parameters Δφ and m are less sensitive.This research conclusion can provide reference for the rational deformation prediction of earth-rock dam and the study of dam material characteristics.
关键词
土石坝/空间随机场/邓肯-张E-B模型/参数敏感性Key words
earth-rock dam/spatial random field/Duncan-Chang E-B model/parameter sensitivity引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
维普
万方数据