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浙江省淳安县河村水库系省定小(Ⅰ)型危库,右坝头及溢洪道均座落在不稳定古滑坡体上,为保坝及下游安全,决定在坝右山体开凿一条泄洪洞。洞径3.5米,长290米,泄量87米~3/秒。该洞轴线地质条件极为复杂,属矽质页岩夹石英脉,及二层灰岩和三层薄石层,倾角平缓,与洞轴线夹角很小,极易造成洞顶坍方。用常规开挖施工,进尺缓慢,缩小洞径,仍解决不了安全问题,改用锚锭钢筋及喷射水泥砂浆支护,大大加快了挖进速度,提高工效8.7倍。
Zhejiang Province Chun’an Hacic reservoir province set small (Ⅰ) type dangerous reservoir, right dam head and spillway are located in the unstable ancient landslide body, in order to protect the dam and downstream safety, decided to dig a spillway tunnel . Hole diameter of 3.5 meters, 290 meters long, discharge 87 meters ~ 3 / second. The cave axis geological conditions are extremely complex, is a quartz shale quartz vein, and two layers of limestone and thin layer of three thin layers, gentle angle, and the small angle between the hole axis, can easily lead to cave roof collapse. With conventional excavation construction, footage is slow, narrowing the diameter, still can not solve the security problem, switch to the anchor bar and jet cement mortar support, greatly speeding up the digging speed, improve efficiency of 8.7 times.