论文部分内容阅读
塌方是水工隧洞施工过程较为常见的工程事故之一,而顶拱塌方是塌方事故中较难处理的一种.根据官地水电站右岸导流洞进口塌方段回填处理措施,建立最大塌方段的断面计算模型,仿真分析了施工开挖、顶拱塌方段回填和下闸封堵等过程,针对回填混凝土与围岩间的接合状态、衬砌混凝土的抗剪断参数等展开了衬砌结构的安全复核.计算结果表明:回填混凝土与围岩间的粘结强度对衬砌结构受力有重要影响,在顶部回填混凝土与外水压力的共同作用下,衬砌混凝土左右两侧拱座位置是潜在破坏区域,应防止其发生剪断破坏.
The landslide is one of the most common engineering accidents in the hydraulic tunnel construction process, and the collapse of the top arch is more difficult to deal with in the landslip accident.According to the backfilling treatment measures of the landslide inlet section of the right bank of Guandi Hydropower Station, Section calculation model. The process of excavation, backfilling of the collapse section of the top arch and the closing and closing of the sluice are simulated and analyzed. The safety inspection of the lining structure is carried out according to the joint status between the backfill concrete and the surrounding rock and the shearing resistance parameters of the lining concrete. The calculated results show that the bond strength between the backfilled concrete and the surrounding rock has an important influence on the bearing capacity of the lining structure. Under the joint action of the top backfill concrete and the external water pressure, the abutment positions of the left and right lining concrete are potential damage areas To prevent it from shear damage.