官地重力坝极限抗震能力初探

Preliminary study on limit aseismic ability of Guandi gravity dam

考虑官地混凝土重力坝非溢流坝段头部碾压层面、坝基面以及深部滑裂面在地震作用下的开裂破坏,计入地震动能量向无限远域地基逸散的地基"辐射阻尼"效应,综合分析坝顶顺河向相对位移、缝面开合情况和开裂范围以及建基面开裂对灌浆帷幕的影响等,初步研究了官地混凝土重力坝的极限抗震能力,获得官地重力坝超设计地震的超载安全系数约为1.3。

The ultimate aseismic ability of Guandi concrete gravity dam is preliminarily studied to improve the design of non-overflow monoliths.Nonlinear behaviors of various contacts under strong earthquakes are examined,including contacts of roller-compacted layers at the head of dam,dam foundation surface and deep slip surface.Foundation damping is considered to reflect energy dissipation of seismic ground motion through radiation outwards to the surounding foundation.Various effects on grout curtain are comprehensively analyzed,the effects of relative streamwise displacement at the dam crest,contacts opening and closing and opening range.Results show that relative to the design earthquake,the overloading safety factor of Guandi gravity dam is about 1.3.