地震作用下高心墙堆石坝超孔隙水压力演变分布规律研究  

Evolution and Distribution Law of Excess Pore Water Pressure of High Core Rockfill Dam Under Earthquake

作　　者：郭丽娜[1] 曹学兴 陈豪 GUO Lina;CAO Xuexing;CHEN Hao(Yunnan Technology and Business University,Kunming,Yunnan 651701,China;Huaneng Lancang River Hydropower INC.,Kunming,Yunnan 650214,China)

机构地区：[1]云南工商学院,云南昆明651701 [2]华能澜沧江水电股份有限公司,云南昆明650214

出　　处：《水利与建筑工程学报》2020年第6期83-87,100,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家重点研发计划(2018YFC0407105);华能集团总部科技项目(HNKJ2019-H12)。

摘　　要：传统经典的振动孔压模型一般根据砂土试验得到,不能直接应用于高心墙堆石坝动力计算中。根据饱和不排水动三轴试验,提出了一个适用于掺砾黏土、砂砾石等土料的振动孔压模型,并编制了计算程序应用于某高心墙堆石坝动力计算分析中,计算得到了地震过程中及震后超孔隙水压力演变分布规律:地震过程中,超孔隙水压力和超孔压比不断增大,且增长的幅度与材料和地震强度密切相关。震后超孔隙水压值随时间减小,渗透系数越小,超孔隙水压力消散越慢。由于超孔隙水压力在消散中伴随着扩散现象,导致部分区域孔压先增长后降低,震后48h超孔隙水压力仍有250kPa。Traditional classical model of dynamic pore water pressure is usually obtained by physical experiment,so it could not be directly applied to the dynamic calculation of high core rockfill dam.According to dynamic triaxial test under the saturated-undrained condition,a dynamic pore water pressure model for clay mixed with gravels and sandy gravels was proposed,and it is programmed for calculation analysis on the dynamic response of core rockfill dam.Using this model,evolution and distribution law of excess pore water pressure during and after the earthquake was calculated.During the earthquake,excess pore water pressure and excess pore pressure ratio will increase constantly,and the increase range was determined by the material and earthquake intensity.After the earthquake,excess pore water pressure will decreasing gradually.The smaller the permeability coefficient became,the more slowly excess pore water pressure dissipated.Because of the diffusion accompanied by the dissipation,excess pore water pressure in some regions firstly increase and then decrease which was still 250 kPa 48 hours after the earthquake.

关 键 词：心墙堆石坝 地震 振动孔隙水压力 消散规律 扩散规律 

分 类 号：TV641.1[水利工程—水利水电工程]