摘要
高心墙堆石坝水力劈裂问题得到国内外学者的极大关注,特别是在初期导流洞及中期导流洞封堵后,水库水位上升速率可能很快,极易形成"水楔"作用.采用土工离心模型试验技术,模拟了长河坝心墙中存在裂缝和不同蓄水水位上升速率.模拟结果表明蓄水水位上升速率越快,心墙裂缝的内外水压力差增长越快,峰值越大,大坝允许最大蓄水速率为25.5m/d.
The hydraulic fracturing of high earth - rockfill dams has been widely concerned. When the initial and middle diversion tunnels are plugged, the reservoir water level may rise rapidly, and＂ water wedging＂ ac- tions may be induced. The crack in the core and different of initial impounding speed for Changhe Dam are simulated in centrifuge modeling tests. The faster the initial impounding speed is, the rapider the difference of water pressure of the core near crack increases, and the larger the maximum difference is. The ultimate initial impounding speed of the dam is 25.5 m/d
出处
《郑州大学学报（工学版）》
CAS
北大核心
2012年第5期72-76,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51179106)
关键词
高心墙堆石坝
蓄水速率
水压力差
水力劈裂
离心模型试验
high core rock-fill dam
velocity of impounding
difference of water pressure
hydraulic fractu-ring
centrifuge modelling test
