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1概述小浪底工程所有泄洪排沙、引水发电、灌溉引水建筑物均布置在左岸相对单薄的山体,16条隧洞进口组合成“一”字型排列的10座进水塔;塔后边坡高120m,枢纽总泄流能力为17063m~3/s。入水口位于左岸风雨沟内,主要有引渠、导流进水塔等构筑物组成。F_(28)断层及其分支断层F_(28-1)F_(28-2)由南向北,依次穿过1~#导流洞引渠边坡、3~#导流洞直立边坡、引渠北侧边坡、灌溉塔上游北端侧基础及塔群北侧局部山体,与其它断层共同形成数10m的强破碎影响带。因此,F_(28)断层的处理设计,直接关系到引渠边坡的稳定和施工期的安全,关系到灌溉塔的结构稳定乃至枢纽工程的安全。经过几年的运行实践说明该断层的处理设计,符合工程地质条件,满足了基础承载、边坡稳定及经济合理的要求。
1 Overview Xiaolangdi all flood discharge and sediment discharge, diversion power generation, irrigation and diversion structures are arranged in the relatively thin left bank of the mountain, 16 tunnel inlet combination of “a” shape of the 10 inlet towers; behind the tower slope of 120m, Total hub discharge capacity of 17063m ~ 3 / s. The water inlet is located in the storm drains on the left bank, mainly consisting of diversion structures, diversion towers and other structures. The F_ (28) fault and its branch fault F_ (28-1) F_ (28-2) pass through the diversion tunnel diversion pit slope 1 ~ # and the upright slope of diversion tunnel 3 ~ # from south to north, The north slope of the ditch, the north end of the upper part of the irrigation tower, and the local mountain on the north side of the tower group together with other faults form a strong crushing belt with a number of 10m. Therefore, the treatment design of the F_ (28) fault is directly related to the stability of the ditch slope and the safety during the construction period, and is also related to the structural stability of the irrigation tower and even the safety of the hub project. After several years of operational practice, the fault handling design is in line with the engineering geological conditions to meet the basic bearing, slope stability and economic and reasonable requirements.