CCS水电站地下厂房枢纽关键点设计研究与实践
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摘要
厄瓜多尔CCS水电站地下厂房洞室群规模宏大,布置密集,洞间围岩存在薄岩壁失稳问题。合同约定的机组安装高程低,存在高水位发电时下游河道水位壅高导致机坑水位升高的问题,另外尾水边坡为火山灰高边坡,坡面有多条冲沟,地质条件复杂,存在边坡失稳问题。设计采用工程类比法、二维及三维分析手段、反演分析法确定边坡地质参数,并采取施工及安全监测实时联动优化等措施,有效解决了一系列关键技术难题,为工程的安全运行奠定了坚实的基础。
Coca Codo Sinclair(CCS) Hydropower Project in Ecuador has a group of underground powerhouses featuring grand caverns arranged in a concentrated way. Thin faces of surrounding rock among caverns are subject to instability. The contractual installation elevation of units is low, which would result in a problem of the water in downstream river channel banking up the water level in unit pit during power generation under high water level. The tailwater slope is high volcanic ash slope with multiple gullies developed and complicated geological conditions, which compromises the slope stability. During the design, engineering analogy, 2 D & 3 D analysis and inverse analysis were applied to determine the slope geological parameters, and measures such as real time interaction of design, construction and instrumentation were taken. Such design had solved a series of key technical problems and established a firm foundation for safe operation of the project.
Coca Codo Sinclair(CCS) Hydropower Project in Ecuador has a group of underground powerhouses featuring grand caverns arranged in a concentrated way. Thin faces of surrounding rock among caverns are subject to instability. The contractual installation elevation of units is low, which would result in a problem of the water in downstream river channel banking up the water level in unit pit during power generation under high water level. The tailwater slope is high volcanic ash slope with multiple gullies developed and complicated geological conditions, which compromises the slope stability. During the design, engineering analogy, 2 D & 3 D analysis and inverse analysis were applied to determine the slope geological parameters, and measures such as real time interaction of design, construction and instrumentation were taken. Such design had solved a series of key technical problems and established a firm foundation for safe operation of the project.
引文
[1] 杨元红.厄瓜多尔CCS水电站EPC+C项目技术管理[J].云南水力发电,2014,30(5):23-26.
[2] 夏朋,吴浓娣,王建平,等.水利“走出去”典型案例成效分析及经验启示:以科卡科多辛克雷水电站和凯乐塔水电站为例[J].水利发展研究,2018,18(2):64-70.
[3] 水利部水利水电规划设计总院.水利水电工程地下建筑物设计手册[M].成都:四川科学技术出版社,1993:11.
[4] 杨法玉.引水发电建筑物设计[M].郑州:黄河水利出版社,2006:24.
[5] 覃永恒.百色水利枢纽地下厂房洞室布置[J].广西水利水电,2000(3):7-11.
[2] 夏朋,吴浓娣,王建平,等.水利“走出去”典型案例成效分析及经验启示:以科卡科多辛克雷水电站和凯乐塔水电站为例[J].水利发展研究,2018,18(2):64-70.
[3] 水利部水利水电规划设计总院.水利水电工程地下建筑物设计手册[M].成都:四川科学技术出版社,1993:11.
[4] 杨法玉.引水发电建筑物设计[M].郑州:黄河水利出版社,2006:24.
[5] 覃永恒.百色水利枢纽地下厂房洞室布置[J].广西水利水电,2000(3):7-11.