南水北调高填方渠道沉降过程计算方法研究  

CALCULATION METHOD STUDY OF SETTLEMENT PROCESS OF HIGH FILLING CHANNELS IN SOUTH-TO-NORTH WATER DIVERSION PROJECT

作　　者：张宇[1] 陈善雄[1] 余飞[1] 熊署丹[1] 戴张俊[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《岩石力学与工程学报》2014年第A02期4367-4374,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金："十二五"国家科技支撑计划项目(2011BAB10B02)

摘　　要：高填方渠道的沉降变化过程在南水北调工程中是难以预估的,借助ANSYS有限元,研究填高H、弹性模量E、泊松比等因素对渠道沉降的影响规律,提出侧向变形修正系数K1与附加沉降修正系数K2,并修正填土在加载过程中的压缩模量,在分层总和法的基础上,建立一种适用于高填方渠道沉降变化过程的计算方法。渠道在分级荷载Pi的施加过程中,主要以固结沉降Sj为主,当分级荷载Pi保持不变时,主要产生蠕变变形Ss。该方法的计算参数较少,且考虑侧向变形、附加沉降、以及压缩模量随深度变化等产生的影响,可合理地计算出高填方渠道,从开始填筑直至工后沉降稳定期间的沉降变化过程与沉降总量。基于本文的计算方法,在Matlab7.0上编制可视化的应用程序,并合理地模拟和预测高填方渠道在分级加载下的沉降变化过程,为高填方渠道的设计和施工提供一种快捷实用的指导方法。The settlement process of high fill channel is difficult to predict in the south-to-north water diversion project. The influence of filling height H,elastic modulus E and Poisson＇s ratio on the channel were clarified with ANSYS FEM. The lateral deformation correction coefficient K1 and the additional settlement correction coefficient K2 were proposed,and the compression modulus of filled soil was corrected during the loading process. And a calculation method which was applicable to the settlement process of high fill channel was established on the basis of layered summation method. The settlement of channel based mainly on the consolidation settlement Sjin the process of grading load Pi which mainly produce creep deformation Ss when the grading load Pi remains constant. The method has less calculating parameters,and the impact of the lateral deformation,the additional settlement and the compression modulus changing with depth are considered. The settlement process and the total settlement,which start from the channel filling until stable during the post-construction settlement,could be properly calculated out by the method. A visualization application was compiled based on the calculation method in Matlab7.0,which could reasonably simulate and predict the settlement process of high fill channel under the application of grading load,and provide a quick and practical guidance for the design and construction of high fill channel.

关 键 词：土力学 南水北调工程 高填方渠道 填筑体 地基层 分层总和法 

分 类 号：TU473[建筑科学—结构工程]