张凤文     （燕山大学土木系  秦皇岛 300072）

    王    春     （秦皇岛市建委 066000）

[提要]  在下伏基岩单向坡度较大的平整场地上岩土地基的震害多为沿下伏基岩面的滑移破坏，并且震害后果严重。这类地基土的抗震稳定性的确定尚无很好的办法，由于土体具有强非线性弹塑性性质，如使用一般圆弧法计算，则会过多地估计被动土压力对土体稳定性的有利影响。结合具体工程实践，介绍这类地基土的稳定分析以及天然地基不满足稳定要求时的解决办法。
[关键词]  平整场地 岩土地基 抗震稳定性

Under the seismic action, flat ground base, which is composed of soil and weathered rock and one way surface slope of underground weathered rock is great, mostly results in the soil sliding on the surface of the weathered rock and the damage is always disastrous. Because of soil's great nonlinear elastic-plastic property, if general slip surface method is still used in analyzing the stability, the effect of the passive earth pressure of soil would be overestimated. With the help of practical construction, author gives the analysis of the stability of this kind of ground base and the treatment when nature base cannot satisfy the stability.
Keywords: flat ground;base composed of soil; weathered rock;seismic stability