东深供水工程凤岗隧洞施工期围岩稳定与支护措施研究

Study on stability of surrounding rock and supporting measures of Fenggang tunnel under construction in Dongshen Water Supply Project

采用三维非线性有限元法,对东深供水改造工程凤岗隧洞施工期围岩的应力和变形进行了仿真分析,研究了围岩的应力变形的分布与变化规律和围岩的稳定性,探讨了支护措施的合理性,介绍了施工期围岩的收敛变形观测成果.综合对比分析观测与计算成果,证实了V类岩区和有断层破碎带的岩区采取钢管拱架与喷混凝土+锚杆联合强支护的经济合理性,为实际工程施工提供了重要参考.

The stress and deformation of surrounding rock during construction period of Fenggang tunnel in Dongshen Water Supply Project are analyzed by using three-dimensional nonlinear finite method. The distributing and change rules of stress-deformation are researched. The rationality of supporting measures is discussed. The monitoring results of convergent deformation of surrounding rock under construction are introduced. By contrasting the monitoring and calculating results, it is shown that using steel pipe arch centering and spaying concrete and bolting support is economic and reliable; and it supplies an important reference for construction.