关键词：
地下洞室;离散元方法;节理岩体;支护优化;支护时机
摘 要：
以西部某电站的导流隧洞为研究对象,对节理岩体中洞室支护措施的优化方法进行了总结,结果表明:对节理岩体进行开挖,应合理确定洞室施工的支护时机及支护措施,并考虑其相互影响。在破碎岩体中,或者在洞室开挖后应力释放率较小的情况下立即支护;或者将衬砌厚度适当加厚,提高衬砌承载力从而推迟支护时机,才能保证围岩不造成大面积松散破坏。锚杆作为柔性支护措施,应在洞室开挖后立即施加,因为锚杆不仅可承受围岩应力,还可提高节理岩体的整体性。
译 名：
DISCRETE ELEMENT STUDY ON OPTIMIZATION FOR SUPPORT MEASURES OF UNDERGROUND CAVERN
作 者：
SHI Yun;SUN Bo;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University;
关键词：
underground cavern;;discrete element method;;jointed rock;;optimization for support measures;;sup-port time
摘 要：
Based on the diversion tunnel for a hydropower station in western part of China,optimization for support measures in the jointed surrounding rocks is analyzed. The results show that when excavating in jointed rock mass,the design of support measures should take account of the effects of the support time and thickness of liner on each other. For the broken rock,the lining structure should be applied in time after excavation. Or the lining structure should be designed thicker to increase its bearing capacity,which can limit the damage in surrounding rock. Owing to the role of rock bolt is to improve the mechanical properties and bearing capacity of the rock,it should be applied immediately after the excavation.
