响洪甸抽水蓄能电站地下厂房的开挖及支护施工

安徽省响洪甸抽水蓄能电站地下厂房采取先开挖顶拱，分台阶下挖，将相邻交叉部位的开挖与台阶开挖安排在同一施工段内进行；使多个工作面同时进行施工。。围岩支护随台阶下挖逐层进行施工，地下厂房在发电机层以上均采用喷锚、挂网、预应力锚杆等方法作永久支护，支护施工时段均安排在每层开挖结束后进行，在支护施工完成并达到龄期后，再进行下层开挖。

Excavation and Support Construction of the Undergroud House of Xianghongdian Pumped Storage Station

For the underground house of Xianghongdian Pump Storage Station in Anhui province,the top arch excavation was conducted firstly,then the down excavation by steps was adopted.The neighboring cross excavation and step excavation were arranged in the same construction stage to make construction on many work faces performed simultaneously.The surrounding rock support were constructed by layers as the down excavation of steps.Above the generator floor of underground house,the jetting concrete and anchoring,net hanging and prestressed anchor rod were used as permanent supports.The time intervals of support construction were all arranged after the excavation of each layer.After the support construction were finished and the age reached,the down layer excavation were conducted.