中文摘要：

为了研究软弱破碎围岩隧道联合支护各构件的作用效果,以四川省宝兴水电站引水隧洞工程为背景,采用有限差分数值计算软件对隧道围岩注浆加固圈、喷射混凝土和型钢支撑3种支护措施的围岩荷载承担比重进行了研究。通过采用固定支座等效代替某种支护的方式,设计了3种支护方案,每个方案仅采用2种支护方式,计算至平衡,提取支护反力并转化成应力,从而得到该支护结构的荷载分担比。研究表明：型钢支撑起到及时强支护作用,可有效控制围岩变形;随着时间推移,当喷射混凝土达到一定的强度后,发展为主要承载结构,喷射混凝土面层承担更大比率释放荷载,喷射混凝土承载荷载比重最大,注浆加固圈次之。计算得出宝兴水电站引水隧道型钢支撑、注浆加固圈和喷射混凝土3种支护荷载承担比重为1∶1.25∶1.6。

英文摘要：

The surrounding rock load bearing ratio under 3 kinds of support method,i. e. grouting reinforcement ring,shotcreting and shaped-steel, are analyzed by finite difference numerical calculation software, taking Baoxing Hydropower Station water diversion tunnel for example. Three support schemes are designed and the load bearing ratios of every support structure are obtained. The study results show that： 1） The shaped-steel support,plays support strengthening timely effect,can control surrounding rock deformation effectively. 2） The shotcrete becomes main load bearing structure after reaches a certain strength,and the surface of shotcrete bears more releasing loads followed by grouting reinforcement ring. The load bearing ratio of shaped-steel support,grouting reinforcement ring and shotcrete is 1∶ 1. 25∶ 1. 6 as showed in calculation results.