大型多岔调压井围岩稳定分析及开挖支护措施优化研究

Stability Analysis of Surrounding Rock and Optimization of Excavation and Support Measures of a Multiple-Bifurcated Surge Shaft

以某水电站大型多岔调压井为研究对象,用三维有限元法模拟分析调压井施工力学过程,得到施工期调压井围岩的应力场、位移场及塑性区分布等特性,同时还用块体理论对块体稳定进行分析,在上述计算分析成果的基础上,提出一期开挖支护措施型式。通过对施工期监测数据分析可知,支护方式满足设计要求;给出一种针对大型多岔调压井且具有倒悬反拱结构的新的开挖方式,可为同类工程提供很好的借鉴。

Taking a large multi-bifurcated regulator well of a hydropower station as the research object,the construction mechanics process of the regulator well is simulated and analyzed by three-dimensional finite element method,and the characteristics of stress field,displacement field and plastic zone distribution of the surrounding rock of the regulator well during the construction period are obtained.At the same time,the block stability is analyzed by block theory.On the basis of the above calculation and analysis results,the type of first-phase excavation support measures is proposed.Through the monitoring data analysis of the construction period,it can be seen that the support method meets the design requirements.This paper presents a new excavation method with inverted arch structure for large multi-turnout regulator well,which can provide a good reference for similar projects.