通过对边界品位法及盈亏平衡法的理论分析，确定下盘最大切岩高度。
The greatest height of footwall cutting is determined through the theoretical analysis of cut-off grade method and breakeven point method.
采用小参数摄动法，导出了系统的一阶和二阶控制方程，边界条件，连续条件，平衡条件及相容条件。
Taking a proper asymptotic sequence and perturbation technique, the control equations, the continuity, equilibrium and compatibility conditions of the first order and second order are derived.
最后着重讨论边界可能的组合形式，利用刚体极限平衡分析法对杨房沟坝肩抗滑稳定进行评价。
Finally, possible combinations of boundaries and anti-sliding stability of Yangfanggou dam abutment rock mass are evaluated using rigid limit equilibrium analysis method.
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