摘要
玉龙混凝土面板堆石坝位于狭窄河谷,并且坝址河床砂卵砾石层渗透性强,抗渗稳定性差。该工程采用帷幕灌浆、高趾墩、混凝土面板组成坝体防渗系统,最大坝高230.5m,这种混合式超高面板堆石坝在国内外已属罕见。按照规范要求对堆石坝料进行分区、及坝基进行处理并采用,再通过进行三维渗流有限元计算,全面、完整地掌握大坝各分区渗流场状况。结果表明:校核水位渗流场水头分布规律合理,总水头等值线在面板、趾板、高趾墙、帷幕等处较为密集,上游水头由这些部位承担,渗控系统起到了很好的防渗效果。表明此次对坝料分区、及坝基处理较为合理,混凝土面板、垫层料、花岗岩爆破料最大渗透坡降均小于破坏水力坡降,设置帷幕可以使两坝肩渗漏量很小,绕坝渗流并不明显,受到右岸单薄山梁影响,右岸渗漏量最大但也满足渗漏要求,表明这种混合式防渗系统的防渗效果明显。依此,为今后类似工程提供借鉴。
The Yulong concrete face rockfill dam is located in a narrow river valley with strong permeability and poor impermeability.The dam is composed of curtain grouting,high toe pier and concrete face slab.The maximum dam height is 230.5 m.This kind of concrete type super high face rockfill dam is rare at home and abroad. According to the requirements of the code,the rockfill dam materials are zoned,and the dam foundation is treated and adopted.Then,through the three-dimensional seepage finite element calculation,the seepage field of each zoning of the dam can be fully and completely grasped.The results show that the head distribution of the seepage field is reasonable.The total head contours are dense in the face slab,toe slab,high toe wall and curtain.The upstream head is assumed by these parts.The seepage control system has a good effect on seepage control.The results show that the zoning of dam material and the treatment of dam foundation are reasonable.The maximum seepage gradient of concrete face slab,cushion material and granite blasting material is smaller than the hydraulic gradient of failure.The curtain can make the seepage of both abutments very small,the seepage around the dam is not obvious,and is affected by the thin mountain beam on the right bank.The seepage control effect of the mixed type seepage control system is obvious.It will provide reference for similar projects in the future.
作者
郭宇
朱银邦
崔炜
吴俊杰
Guo Yu;Zhu Yingbang;Cui Wei;Wu Junjie
出处
《吉林水利》
2018年第12期12-16,共5页
Jilin Water Resources
关键词
混合式超高面板堆石坝
高趾墩
渗流场
渗控系统
Hybrid super high concrete face rockfill dam
high toe pier
seepage field
seepage control system
作者简介
郭宇(1980-),男,新疆乌鲁木齐人,硕士、高级工程师,研究方向水工结构设计。
