【摘要】 水工隧洞圆形进水口方案有全断面开挖和上下半洞台阶开挖步序,根据实际工程概况、地质条件利用有限元软件建立圆形进水口段的三维非线性分析模型,对比同一支护条件下圆形进水口方案全断面开挖和上下半台阶开挖步序的分析结果,分析两种不同开挖步序下该段放空洞围岩稳定性状。得出圆形方案的最优开挖步序。更多还原

【Abstract】 There are two excavation approaches for the circular tunnel of the water inlet,namely the full-face tunneling method and the upper and lower half hole step excavation method. According to the actual engineering situation and geological conditions, this paper uses the finite elements software to establish the three-dimensional nonlinear analysis model for the circular water inlet,and compares the results of the full-face tunneling method and the upper and lower half hole step excavation method under the same supporting conditions,and analyzes the stability of the surrounding rock mass of the two different excavation sequences. Finally the best excavation sequence for the project of the circular tunnel of the water inlet is obtained.更多还原