纳子峡纤维素纤维混凝土面板坝服役期渗流特性分析

为掌握纳子峡纤维混凝土面板砂砾石坝在服役期间的抗渗情况,在纳子峡水利枢纽布置了较全面的渗流监测设备,根据纳子峡面板砂砾石坝在2016年至2018年间的渗流监测结果,对大坝坝基、坝体、周边缝、绕坝渗流及大坝渗漏量的渗流变化规律及分布特征进行了分析和评价。分析结果表明:坝基、坝体、周边缝等重点部位防渗系统工作正常,渗流量趋于稳定;绕坝渗流及大坝渗漏量符合实际渗流规律,纳子峡水利枢纽工程大坝渗流监测设计合理,能充分反映大坝不同部位的渗流情况。大坝在地震时期的渗流形态稳定,地震对面板损坏程度影响较小,面板裂缝在控制范围之内,纤维素纤维混凝土服役性能稳定,在面板混凝土中添加纤维素纤维有利于面板防渗。

Analysis on seepage characteristics of Nazixia fiber concrete face dam during service period

In order to grasp the impermeability of the Nazixia fiber concrete face sandy gravel dam during service,comprehensive seepage monitoring equipments are arranged in the Nazixia water control project.Based on the seepage monitoring results of the Nazixia face sandy gravel dam from the year of 2016 to 2018,the seepage variation rules and distribution characteristics of the dam foundation,dam body,surrounding joints,seepage around the dam and the leakage of dam are analyzed and evaluated,so as to provide a basis for relevant projects.Analysis results show that the anti-seepage system of key parts such as dam foundation,dam body and surrounding joints works normally,and the seepage flow tends to be stable.The seepage around the dam and the leakage of the dam are in accordance with the actual seepage law.The dam seepage monitoring design of the Nazixia Water Control Project is reasonable and can fully reflect the seepage of different parts of the dam.The seepage form of the dam during the earthquake period is stable,the impact of the earthquake on the panel damage is small,the panel crack is within the control range,the cellulose fiber concrete has stable service performance,and the addition of cellulose fiber in the panel concrete is beneficial to the panel anti-seepage.