In this paper , author has a summary to method of stability of arch dam abutment , research method of limited rigid body equilibrium and nonlinear fem simulation analysis for arch dam designs based on ansys 本文对拱坝坝肩稳定分析方法进行概述，较为深入的研究了刚体极限平衡法，以及非线性有限元在ansys中的运用。
When the rock mass of dam abutment is enclosed by faults , joint fissures and bedding planes , it is necessary to carry out holistic anti - slide stability analysis in order to make the abutment withstand potential slide 摘要当拱? ?肩岩体为断层、节理裂隙、层面等结构面所围成，有可能产生滑移时，就应进行整体抗滑稳定分析。
Based on study above , the deformation and failure character of rock mass of dam abutment has been analyzed by 2d finite element method . and the distinct recognition on stability of rock mass has been got 在以上研究的基础上，应用二维有限元分析技术，分析了坝肩岩体的变形破坏特征，从而对岩体稳定性状况得出更为明晰的认识。
Compound deformation on right dam abutment is the result from three deformation modes acting together . the three deformation modes are pressing - plastic fluxion rip mode , toppling - tensional and shearing fracture mode , stress release - tensional fracture mode 右坝肩复杂变形是压致?塑流拉裂、倾倒?张剪和卸荷?张裂破坏三种变形模式复合作用的结果。
Arch dam , which is fastened to the base rock , is a high _ order , hyperstatic , spacial body case structure . it has not only arch function but also girder function , but its main loads are passed to each dam abutment by means of arch function 拱坝是固结于基岩的高次超静定空间壳体结构，既有拱作用又有梁作用，其主要荷载是通过拱的作用传到两岸坝肩。
Arch dam , which is fastened to the base rock , is a high _ order , hyperstatic , spacial body case structure . it has not only arch function but also girder function , but its main loads are passed to each dam abutment by means of arch function 拱坝是固结于基岩的高次超静定空间壳体结构，既有拱作用又有梁作用，其主要荷载是通过拱的作用传到两岸坝端。
With development of computer science , the analytic method of stability of arch dam abutment is more and more diversification . the stability of arch dam abutment is important prerequisite of stability of arch dam , so it becomes an important research subjects 随着计算机科学技术飞速发展，拱坝稳定分析的手段也越来越多样化，而拱坝坝肩稳定是拱坝稳定重要前提，因而它也就成为一个重要的研究课题。
Research result indicated that on the basis of all kinds of tensional fracture , intricate deformation phenomenon is controlled by three kind of fracturing failure , such as compression - plastic flowing fracture , career - fracturing and relief - fracturing and their organic assemblage in right dam abutment 研究结果表明，右坝肩岩体以各类张裂为主要表现形式的复杂变形现象，受控于压致-塑流拉裂、倾倒-张裂及卸荷-张裂等三类张性破坏及其有机的组合。
3 . based on the topography and geologic character of niutoushan arch dam abutment and base , and the interlayer and internal faults , which control the stability of the project , we build the three - dimensional geomechanical model and carry out the upto failure test by overload method . 4 结合牛头山拱坝坝肩坝基的地形、地质特征，以及对稳定起控制作用的层间、层内断层的分布状况，建立了三维地质力学模型，运用超载法对整体模型进行了破坏试验。
The research progressing as follows : ( l ) basic developmental character and engineering control effect of continuous macrostructure plane ( i and ii level ) of dam abutment has been systemically studied . and this kind of structural plane took important effect to appraise rock mass distortion and failure and stability 论文研究进展主要有以下几方面： ( 1 )系统研究了坝肩宏观贯通性结构面(分类中的及级)发育的基本特征以及它们的工程控制效应，阐明了该类贯通性结构面对坝肩岩体变形破坏及岩体稳定性评价起主导作用。
