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棉花滩水电站地下厂房的施工特点是洞室群复杂 ,且以地下厂房为中心的三大洞室均为大洞室高边墙 ,不能一次完成开挖支护 ,故在施工中强调施工观测及施工过程的程序化 .针对不同部位洞室的需要 ,分别采用了与之相适应的开挖方式 .地下厂房由上至下 ～ 层顶拱、边墙 (包括端墙 )均采用锚喷支护方式 ,主要以锚杆挂网喷混凝土为主要支护型式 .地下厂房施工观测进行了围岩收敛观测、松动圈测试和多点位移计锚杆应力计观测 ,总体观测表明 ,地下厂房围岩安全稳定 .棉花滩地下厂房岩壁吊车梁混凝土中掺入 15%～ 2 0 %的粉煤灰 ,并采用泵送入仓 ,准确控制水灰比和入仓塌落度 ,获得了满意的效果 .
The construction of the underground powerhouse of Mianhuatan Hydropower Station is characterized by complex caverns and the three main caverns centered on the underground powerhouse are all high-wall caverns of large caverns, so excavation and support can not be completed at one time. Therefore, construction observation and construction process are emphasized .According to the needs of different parts of the cavern, respectively, with the corresponding excavation. Underground plant from top to bottom ~ top arch, side walls (including the end wall) are used anchor spray support, The main support type is spray grouting concrete with anchor net.Concrete observation, loose ring test and multi-point displacement meter stress measurement of anchor rod in underground powerhouse construction observation show that the surrounding rock of underground powerhouse is safe and stable. Mianhuatan underground plant rock wall crane beam concrete incorporation of 15% ~ 20% of the fly ash, and the use of pumping into the warehouse, accurate control of water-cement ratio and warehouse slump, and achieved satisfactory results.