大岗山高拱坝坝肩刚体弹簧元抗滑稳定分析

Stability Analyses of Dagangshan High Arch Dam's Abutment by Using Rigid Body Spring Element Method

为研究大岗山高拱坝的坝肩抗滑稳定性,采用刚体弹簧元法对大岗山高拱坝坝肩滑块稳定性展开研究,并与刚体极限平衡法成果进行对比。计算结果表明,水推力是影响滑块稳定性的主要因素,摩擦系数较凝聚力对滑块的稳定性影响更为显著,相比刚体极限平衡法,二者滑块抗滑稳定安全系数规律一致,刚体弹簧元计算考虑了坝体与地基的相互作用和坝基的地质特征,结果更为合理。

In order to study the stability of the Dagangshan arch dam＇ s abutment, a rigid body spring element method is used here, and compared with the rigid body limit equilibrium method. The results show that the hydraulic thrust plays a dominant role for affecting the stability of slip bodies. Comparing the friction coefficient with cohesion force, the stability of slip bodies is more sensitive to the friction coefficient, and the behavior of the safety factor is consistent with the result obtained by the limit equilibrium method. In the calculation with the rigid body spring element method, the interaction of the dam body and foundation is taken into account, and the geological characteristics of the dam foundation are modeled in detail, so the result from rigid body spring element method is more reasonable.