土质堤坝地震反应的简化有效应力计算方法

详细介绍了一种简便计算土质堤坝地震过程中动孔隙水压力增长的方法一一动孔压试验曲线法的基本原理和计算过程。利用该法对一土坝进行了考虑动孔压影响的非线性有效应力动力分析，预测了抗震加固前后大坝可能液化范围和坝坡稳定安全系数，并作比较分析。分析表明，动孔压试验曲线法应用简便，计算结果合理可靠。采用堆石压坡抗震措施能有效地减小大坝的液化度和可能液化范围，同时又能明显提高坝坡抗震的动力稳定性。

FEM Analysis on Resistance of Earthquake Impact for Earth Dike and Dam

The principle and computation process of a calculation method for dynamic pore water pressure for earth dike and dam during earthquake, test curve method for dynamic pore water pressure, were stated in detail. Using this calculation method the dynamic responses of an earth dam were analyzed by non-linear effective stress FEM. The possible liquefacient zones and safety factor for dam slope stability were forecasted before and after strengthening of dam respectively and were compared each other. The investigation shows that the forgoing method for calculation of dynamic pore water pressure is very convenient for application and the results are reasonable and reliable. Besides, the anti-seismic measure using the gravity of rockfill is effective to reduce the liquefaction degree and the scope of possible liquefacient zones, and also to increase the dynamic stability of dam slope during earthquake.