【正文】 those from simplified procedures currently used in engineering practice. It was found that in a jointed rock, foundation uplift estimates after crack development obtained from present design guidelines can be too conservative and result in factors of safety that are too low and do not correspond to the observed behavior. Key words: Hydromechanical, jointed rock, flow, dam design. Introduction: Evaluating the safety of concrete gravity dams against sliding requires an understanding that rock foundations and the structure above them are an interactive system whose behavior is controlled by the mechanical and hydraulic properties of concrete materials and rock foundations. About a century ago, the failure of Boozy Dam prompted dam engineers to start considering the effect of uplift pressures generated by seepage within the dam–foundation system and to explore ways to minimize its effect.. Today, with modern putational resources and much more precedent, it is still most challenging to determine the porepressure distribution along foundation discontinuities to assess pertinent stresses and evaluate factors of safety. It is our opinion that observing and monitoring the behavior of large dams on well mapped and adequately instrumented foundations can bring important insights for a better understanding of factors controlling joint opening, crack propagation, and porepressure development in foundations of concrete gravity dams. behavior of natural joints :(a) mechanical。 and G is the shape factor, which depends on the geometry of flow. For straight flow, G=W/L (where W and L are the width and length, respectively, of the joint)。 h? is the head drop along the rock joint。所測巖石滲透 率穩(wěn)步下降，在深度的增加，然而，它們的值與對應的巖體滲透性的理論與模型估計趨勢良好。巖體的滲透性， K，理論的深度關(guān)系的結(jié)果高達 1000 米，采用當量。 因此，用經(jīng)典的立方定律表示通過巖石節(jié)理流率： 其中 Q 是流量 。該單位的壓力關(guān)閉規(guī)模迅速下降，但是，隨著應力水平增加。 本文介紹了在過去 20 個來自 Albigna 大壩，瑞 士，多年收集的水庫運行周期行為的代表的監(jiān)測數(shù)據(jù)，描述了一系列的數(shù)值分析結(jié)果及評估了其基礎流體力學行為。結(jié)果發(fā)現(xiàn)，在巖石節(jié)理，估計裂縫發(fā)展后的基礎隆起從目前所得到的設計準則過于保守以及導致的安全性過低，不符合觀察到的行為因素。 混凝土重力壩基礎流體力學行為分析 摘要：一個在新的和現(xiàn)有的混凝土重力壩的滑動穩(wěn)定性評價的關(guān)鍵要求是對孔隙壓力和基礎關(guān)節(jié)和剪切強度不連續(xù)分布的預測。 關(guān)鍵詞：流體力學，巖石節(jié)理，流量，水庫設計。比較了數(shù)值模擬和實際行為在實地的監(jiān)測結(jié)果。雙曲線的定義是由初始切線剛度定義， niK ，并聯(lián) 合最大的漸近結(jié)束， mcV 。 w? 是水的單位重量 。 [5]載于圖 2。 典型液壓孔徑 400 500μ m的和后關(guān)節(jié)僵硬 = NIK 10V的雙曲線關(guān)系，與三菱商事和 mcV = hoa 似乎同意這些結(jié)晶巖體觀測場行為良好。 μ is the dynamic viscosity of the water( 310? Pa ha Is the joint hydraulic aperture。 雖然真正的流體力學節(jié)理巖體的行為是需要考慮具體的地點和地質(zhì)因素，該方法提供了一個框架，但在設計階段，其中巖石資料尚未提 供大規(guī)模滲透。覆蓋層講估計使用的是 kN/m3 單位重量。μ是水（ 310? p?s）的動力粘度 。 niK 和 mcV 的價值觀通過對實驗數(shù)據(jù)的回歸分析來估計的。這些項目包括壓力管道，危險