锦屏二级水电站深埋特大引水隧洞关键技术

Seven tunnels across Jinping Mountain are arranged for Jinping Ⅱ Hydropower Station, with a total length of about 120 km. Among them, four headrace tunnels have a length of 16.67 km, an excavated diameter of 12.4-14.6 m, and a cover depth of 1 500-2 000 m in general. The maximum cover depth is 2 525 m, and the maximum external water pressure is more than 10 MPa. The tunnels are featured by great length, great depth and large diameter. It is the largest and most difficult among the underground tunnel groups built or under construction in China and even the world. With complex hydrogeological conditions and special topographical conditions along the tunnels, many challenging problems, such as rock burst under high in situ stresses, groundwater inrush in karst strata and failure of loading bearing structure, were encountered during construction. A great amount of groundbreaking studies were carried out regarding these problems. The key technical problems during construction of extremely large and deep tunnels were solved successfully. Safe and rapid tunnel construction and stable operation were achieved. The hydropower station started operation in 2014 and has been in a safe and stable operation state. The successful construction of headrace tunnels of Jinping Ⅱ Hydropower Station can provide some experiences and reference for deep tunnel projects in the world.     

小断面水工隧洞施工机械选型及配套

结合实例,介绍小断面水工隧洞施工运输机械设备选型配套过程,为同类型的隧洞施工积累了经验.     

梅底2#引水隧洞控制超欠挖的主要措施

以梅底2#引水隧洞工程为例，从提高施工工艺、操作精度和改进施工方法的角度，介绍控制超欠挖的经验和措施。     

弱固结围岩中圆形隧洞的地层反应

为了研究弱固结地层中圆形隧洞围岩封闭界面的特征曲线，提出了承受均布外部应力、内部压力的圆形孔洞附近的应力和位移的封闭式解。由于大多数弱固结岩土材料显示出非线性相关的强度特性，故结合非线性虎克－布朗准则采用了弹塑性模型。因此，大多数帝类现有的封闭式解均是采用线性莫尔－库伦准则获得，所以，将所推荐的解与线性准则求得的结果作比较，以评价线性假定可能的影响。结论是由线性莫尔－库伦准则所得的计算结果，对低法     

综合超前地质预报在小坪子隧洞中的运用研究

研究目的：研究如何在施工过程中对隧洞掌子面前方的地质条件进行预报，减少地质灾害的发生。研究方法：在超前地质预报的宏观预报、长期预报、短期预报、临近警报等不同阶段，以地质理论为基础，综合运用地质方法、地球物理勘探方法、钻探方法，结合实践经验进行研究。研究结果：得出了地质预报的阶段性和不同阶段的预报方法，提出了地质超前预报体系各方法的相互关系，得出了实施超前地质预报应采用的步骤、方法及实施时应注意的问题。研究结论：深埋长大隧洞施工过程中的地质预报，只有采取地质理论的、地球物理的、钻探的等综合的方法，并且按宏观的、长期的、短期的、临近的思路进行才能取得好的效果。     

概论岩溶或地质复杂隧道隧洞地质灾害超前预报技术

概略论述了岩溶或者地质复杂隧道隧洞广义的施工地质灾害超前地质预报技术,其中包括TSP探测解译、断层参数预测法预报隧道断层和地面不良地质体投射法等3种长期超前地质预报新技术,包括地质雷达探测解译、掌子面编录预测法、不良地质前兆预测法等3种短期超前地质预报新技术,还包括施工地质灾害监测、判断和警报新技术.