雅砻江孟底沟水电站拱坝拱座抗滑稳定研究

Study on Arch Dam Abutment Stability of Mengdigou Hydropower Station

保证拱坝的拱座稳定是拱坝设计和建设的重要问题。孟底沟拱坝两岸抗力体内以断层及蚀变带为代表的各种结构面相对发育且类型复杂,这些结构面相互组合形成的可能滑移块体的稳定问题对孟底沟拱坝方案的成立构成了较大的威胁。本文以传统的刚体极限平衡法及新兴的刚体弹簧元法为主要数值分析方法,结合拱坝——基础整体地质力学模型试验,对孟底沟拱坝坝肩抗滑稳定进行了全面深入的计算分析与论证。通过综合数值分析和模型试验的结果对拱坝的拱座稳定性做出了综合评判,识别了坝肩岩体相对薄弱的部位,并对增强拱坝坝肩稳定的工程措施提出了合理建议。

To ensure the stability of the arch dam is an important problem in the design and construction of arch dam.In the distribution of Mengdigou arch dam abutment with resistance on both sides of faults and alteration zones for various structures represent the relatively well-developed and complex types,the establishment of a stable problem these discontinuities may be combined in a sliding block of mengdigou arch dam project constitutes a greater threat.In this paper,the traditional rigid body limit equilibrium method and the new rigid body spring element method for numerical analysis methods,combined with the dam foundation integral geomechanical model test of Mengdigou arch dam abutment anti sliding stability is a comprehensive and in-depth analysis and demonstration.Through the comprehensive numerical analysis and model test results of the arch dam stability to make a comprehensive evaluation,identify the location of relatively weak abutment,and proposes some suggestions to enhance the engineering measures of stability of arch dam abutment.