重力坝坝基参数对3斜面法安全系数以及滑移形态的影响

The Influence of Dam Foundation Parameters on the Safety Factor and the Slip Form of Three Sliding Planes

为了弥补完全人为假定因素的不足,基于传统的刚体极限平衡双斜面法,建立了3个滑裂面同时满足刚体极限平衡的3斜面力学模型。以某重力坝为例,探讨了重力坝坝基参数对3斜面法安全系数k以及滑移形态的影响,并揭示了一般的规律。结果表明:坝基参数(软弱夹层埋深和倾角、抗剪强度指标)对安全系数k以及滑移形态均有一定的影响。实际工程若能充分考虑这些影响,可使水利工程的建设更加科学可靠。此一般规律不仅对工程实际应用具有一定的参考价值,而且还对重力坝深层抗滑稳定分析具有一定的推动作用。

Based on the traditional rigid body limit equilibrium method, this paper sets up the mechanical model of three sliding planes at which three slip surfaces meet the rigid body limit equilibrium equation at the same time. Taking a gravity dam for example, this-paper discusses the influence of dam foundation parameters on the safety factor and slip form of three sliding planes and reveals the general laws. It turned out that dam foundation parameters, such as weak intercalated layer and dip angle, shear strength index, have influence on the safety factor k and slip form in a sense. These effects should be considered in practical proiects in order to make the projects more scientific and reasonable. This general rule is of great reference value to practical engineering application.