某土石坝上游护坡型式改变影响坝顶高程的试验研究  

Experimental study on effect of the upstream slope protection type change of an earth rock dam

作　　者：徐麦菊 叶伟[2] 徐章耀 刘永强 马福恒[2] XU Maiju;YE Wei;XU Zhangyao;LIU Yongqiang;MA Fuheng(Management Bureau of Zhaopingtai Reservoir,Pingdingshan 467300,China;Dam Safety Management Department,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Management Bureau of Baiguishan Reservoir,Pingdingshan 467301,China)

机构地区：[1]平顶山市昭平台水库管理局,河南平顶山467300 [2]南京水利科学研究院大坝安全与管理研究所,南京210029 [3]河南省白龟山水库管理局,河南平顶山467301

出　　处：《南水北调与水利科技》2018年第3期149-154,共6页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金(51779155);中央级公益性科研院所基本科研业务费专项(Y716007)~~

摘　　要：针对病险水库除险加固过程中会出现的上游护坡型式改变的情况,基于物理模型试验,研究各工况下干砌石与混凝土两种类型护坡的波浪爬高及越浪情况,确定护坡类型变化对波浪爬高和坝顶高程的影响。以某水库大坝为例,采用1∶15的模型比尺进行了不同护坡型式典型断面的波浪物理模型试验。研究发现,由于干砌石、混凝土两种型式护坡的糙渗系数相差0.15,干砌石护坡改为混凝土护坡后最大波浪爬高计算值增长0.56m,试验值增长0.6m,此情况下坝顶的现状高程不能满足规范要求;改变护坡型式后波浪冲击坝顶胸腔而产生的跃浪量也会增加,胸墙收到的最大波浪压力从15.9kPa增至17.8kPa。试验的成果对类似除险加固工程的设计工作具有借鉴意义。In view of the upstream slope protection type change in the process of the reinforcement of dangerous reservoirs,we conducted a physical model test to study the wave run-up and overtopping situation of the dry masonry slope protection type and the concrete type,and determined the effect of slope protection type change on the wave run-up and crest elevation.In this paper,we took a reservoir dam for a case study.A wave physical model test of a typical section of the slope protection types was carried out at the scale of 1∶15.The test results showed that the roughness coefficients of the dry masonry and concrete types differed by 0.15.After the change of slope protection type from dry masonry to concrete,the calculation value of the maximum wave run-up increased by 0.56 m,and the test value increased by 0.6 m.In this condition,the original crest elevation could not meet the standard requirements.In addition,after the change of slope protection,the wave overtopping will also increase.The maximum wave pressure on the parapet will increase from 15.9 kPa to 17.8 kPa.The results of the test can provide a reference to the design of similar reinforcement projects.

关 键 词：土石坝 护坡 坝顶高程 模型试验 糙渗系数 

分 类 号：TV641[水利工程—水利水电工程]