石榴树包滑坡机制的有限元分析

石榴树包滑坡是黄蜡石滑坡的组成部分。利用基于位移控制技术的有限元法对滑坡机制进行了分析，展示了Katona接触单元在模拟滑面时的应用。作为对比，还设置了另一计算方案，在此方案中，将整个滑体的力学参数都取为滑带的力学参数，同时，将滑体和基岩之间的界面作为普通的岩性分界面。计算结果表明，两种不同的连接形式的安全系数相近，但失稳机制却不同，从而证实了边坡的稳定性是由滑带的性状控制的。对于常规有限元法所求得的安全系数与经典的极限平衡法的安全系数之间存在较大差异的原因也进行了分析。

FINITE ELEMENT ANALYSIS ON LANDSLIDE MECHANISM AT SHILIUSHUBAO

The landslide at Shiliushubao is a part of the Huanglashi landslide,a very important ancient landslide in Three Gorges Dams headpond. Analyses are conducted on the mechanism of landslide by means of FEA based on the displacement-controlled method. In case that the slide surface is known,the study illustrates the application of the Katona contact element to modeling sliding surface. As comparison,another computation scheme is set, in which the sliding body is of the property of soil in the sliding band and there is no contact interface between the rock bed and the sliding body. In two manners,the safety factors are approximate but the failure mechanisms are quite different. This states that the property of soil in the sliding band controls the stability of landslide. The study also explains the reason why the safety factors obtained by conventional FEM are different from those by limit equilibrium methods.