摘要
提出了一种现场填筑过程中坝料压实质量控制指标的调整优化方法。利用土石坝填筑现场取得的实测干密度,确定已填筑坝料干密度的随机场数字特征(均值、标准差和相关距离),根据坝料变形参数与干密度相关关系,构建坝体变形参数的随机场,进行坝体随机有限元计算,预测未来大坝的结构响应,从而预判大坝的安全性。并在此基础上,基于二次多项式,建立了各分区坝料干密度随机场数字特征与大坝变形响应的统计特征(均值、标准差)的响应面方程,进而推求大坝变形响应的超越概率表达式,为坝料碾压施工参数优化提供指导,提高大坝安全性。以一实际工程为例,根据不同填筑阶段各分区坝料现场干密度的数字特征,分析了坝料参数的不确定性与大坝结构响应之间的规律。研究表明,随着填筑进度的变化,大坝不确定变形响应分析趋于稳定,心墙料干密度数字特征对坝体最大沉降和倾度影响最大。在此基础上,通过调整大坝变形响应的超越概率变化规律,可以得到优化后的各分区坝料现场干密度的随机场数字特征,从而指导下一填筑阶段大坝的现场碾压施工,以提高大坝变形的控制水平和安全评价精度。
A method for optimizing the compaction quality control index of dams is proposed.Using the collected dry density of field soil samples,the statistics(mean,standard deviation and correlation distance)are determined.According to the correlation between the deformation parameters and the dry density of soils,the random fields of material parameters are established,and the random finite element analysis is carried out to predict the structural responses and safety of dams.Based on the quadratic polynomial,the response surface equation for the statistics of dry density of soils and dam response is established,and the exceeding probability expression is derived.In order to improve the dam safety,the statistics of dry density of soils are further optimized,which provides guidance for the adjustment of construction parameters.Through a practical project,the influence laws of material uncertainty are studied at different filling stages.The uncertain deformation response analysis tends to be stable.The statistics of core wall materials have a great effect on the maximum settlement and deformation gradient.By adjusting the exceeding probability,the statistics of dry density of soils in each partition can be obtained,so as to guide the dam construction and improve the control level of dam deformation as well as the safety evaluation accuracy.
作者
贾宇峰
冯文泉
迟世春
JIA Yufeng;FENG Wenquan;CHI Shichun(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2024年第12期2521-2528,共8页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金面上项目(52379116)
国家重点研发计划(2016YFB0201001)。
关键词
心墙堆石坝
最大沉降
最大倾度
干密度
随机场
core wall rockfill dam
maximum settlement
maximum deformation gradient
dry density
random field
作者简介
贾宇峰(1979-),男,副教授,硕士生导师,主要从事土石坝数值模拟研究。E-mail:jiayf130@dlut.edu.cn;通信作者:冯文泉,E-mail:fengwenquan2019@mail.dlut.edu.cn。
