多重势面模型在混凝土面板堆石坝应力变形分析中的应用
|
摘要
本文采用应力型多重势面模型模拟堆石体的本构关系,模型参数选择邓肯E-B模型的参数,利用自行开发的三维有限元程序对金钟面板堆石坝进行应力变形分析。本文计算的竣工期堆石体沉降量与实测最大值吻合较好。由于多重势面模型能够反映堆石体的剪胀性,因此计算的蓄水期面板应力以压应力为主,拉应力主要分布在两岸,这与已建工程的实测情况相符,克服了常用的邓肯E-B模型计算的面板底部顺坡向出现较大拉应力的缺点,表明多重势面模型能够较好地模拟面板堆石坝的应力与变形。
In this paper,a stress-type multi-potential surface model with the same model parameters as those of Duncan E-B model is adopted to simulate the constitutive relation of rock-fill material,and a 3-D FEM code is used to compute stresses and deformation of Jinzhong concrete faced rock-fill dam(CFRD).The computed maximum settlement of the dam at construction completion stage is in a good agreement with the measured value.The computed results show that at storage stage,the compressive stress in the concrete face slabs is dominant,while the tensile stress occurs in relative small areas near the left and right banks.This feature of stress distribution has been measured and observed on many CFRDs under operation.This multi-potential surface model can describe the dilatancy of rock-fill material,so it overcomes the shortcoming of the widely used Duncan E-B model that often produces too high slope-wise tensile stresses at the bottom of face slabs.These results show that the multi-potential surface model can improve the accuracy of stress and deformation simulation of CFRD.
In this paper,a stress-type multi-potential surface model with the same model parameters as those of Duncan E-B model is adopted to simulate the constitutive relation of rock-fill material,and a 3-D FEM code is used to compute stresses and deformation of Jinzhong concrete faced rock-fill dam(CFRD).The computed maximum settlement of the dam at construction completion stage is in a good agreement with the measured value.The computed results show that at storage stage,the compressive stress in the concrete face slabs is dominant,while the tensile stress occurs in relative small areas near the left and right banks.This feature of stress distribution has been measured and observed on many CFRDs under operation.This multi-potential surface model can describe the dilatancy of rock-fill material,so it overcomes the shortcoming of the widely used Duncan E-B model that often produces too high slope-wise tensile stresses at the bottom of face slabs.These results show that the multi-potential surface model can improve the accuracy of stress and deformation simulation of CFRD.
引文
[1]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社.2004.2.ZHENG Yingren,SHEN Zhujiang,GONG Xiaonan.The principles of geotechnical plastic mechanics[M].Beijing:ChinaConstruction Press.2003.2.(in Chinese)
[2]杨光华,介玉新,李广信,等.土的多重势面模型及其验证[J].岩土工程学报,1999,(5):578～582.YANG Guanghua,JIE Yuxin,LI Guangxin,et al.Multi-potential surface model for soils and its verification[J].Chinese Journal ofGeotechnical Engineering,1999,(5):578～582.(in Chinese)
[3]刘正,介玉新,杨光华,等.应力型多重势面模型及其参数求取的改进[J].长江科学院院报,2006,(1):31～34.LIU Zheng,JIE Yuxin,YANG Guanghua,et al.Multi-potential surface model based on stress and its improvement of determinationof parameters[J].Journal of Yangtze River Scientific Research Institute,2006,(1):31～34.(in Chinese)
[4]顾淦臣,土石坝地震工程[M].南京:河海大学出版社,1989.Gu Ganchen,Seismic engineering of earth-rockfill dam[M].Nanjing:Hohai University Press,1989.(in Chinese)
[5]冀春楼.深厚覆盖层上高堆石坝静、动力分析方法的研究——冶勒堆石坝静、动力工作性态研究[D].南京:河海大学博士论文,1995.7.JI Chunlou.The study of static and seismic analysis of high rockfill dams on deep overburden——analysis of static and seismicworking behavior of Yele dam[D].Nanjing:Ph.D.Dissertation of Hohai University,1995.7.(in Chinese)
[6]朱锦杰,刑林生.天生桥一级大坝面板应力分析[J].水力发电,2005,(9):27～29.ZHU Jinjie,XING Linsheng.Analysis of the stresses in face slab of Tianshengqiao cascade-Ⅰdam[J].Journal of Water Power,2005,(9):27～29.(in Chinese)
[7]朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,1998.ZHU Bofang.The finite element method theory and applications[M].Beijing:China Waterpower Press,1998.(in Chinese)
[2]杨光华,介玉新,李广信,等.土的多重势面模型及其验证[J].岩土工程学报,1999,(5):578～582.YANG Guanghua,JIE Yuxin,LI Guangxin,et al.Multi-potential surface model for soils and its verification[J].Chinese Journal ofGeotechnical Engineering,1999,(5):578～582.(in Chinese)
[3]刘正,介玉新,杨光华,等.应力型多重势面模型及其参数求取的改进[J].长江科学院院报,2006,(1):31～34.LIU Zheng,JIE Yuxin,YANG Guanghua,et al.Multi-potential surface model based on stress and its improvement of determinationof parameters[J].Journal of Yangtze River Scientific Research Institute,2006,(1):31～34.(in Chinese)
[4]顾淦臣,土石坝地震工程[M].南京:河海大学出版社,1989.Gu Ganchen,Seismic engineering of earth-rockfill dam[M].Nanjing:Hohai University Press,1989.(in Chinese)
[5]冀春楼.深厚覆盖层上高堆石坝静、动力分析方法的研究——冶勒堆石坝静、动力工作性态研究[D].南京:河海大学博士论文,1995.7.JI Chunlou.The study of static and seismic analysis of high rockfill dams on deep overburden——analysis of static and seismicworking behavior of Yele dam[D].Nanjing:Ph.D.Dissertation of Hohai University,1995.7.(in Chinese)
[6]朱锦杰,刑林生.天生桥一级大坝面板应力分析[J].水力发电,2005,(9):27～29.ZHU Jinjie,XING Linsheng.Analysis of the stresses in face slab of Tianshengqiao cascade-Ⅰdam[J].Journal of Water Power,2005,(9):27～29.(in Chinese)
[7]朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,1998.ZHU Bofang.The finite element method theory and applications[M].Beijing:China Waterpower Press,1998.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心