冲沟大偏压隧道半明半暗进洞快速施工方法  

Quick Construction Method of Half-Light and Half-Dark Tunneling for Gully Large Bias Tunnel

作　　者：彭友勤 陈正聪 康源 李泽荣 PENG You-qin;CHEN Zheng-cong;KANG Yuan;LI Ze-rong(POWERCHINA SINOHYDRO ENGINEERING BUREAU 14 CO.,LTD.,Kunming 650041,China)

机构地区：[1]中国水利水电第十四工程局有限公司,云南昆明650041

出　　处：《云南水力发电》2023年第2期193-196,共4页Yunnan Water Power

摘　　要：山岭地区隧道洞口常常处于冲沟地形,造成了洞口偏压,洞口施工难度提升,并伴随较大的安全风险。在冲沟地形下,传统施工方法主要是通过对山体大面积开挖,在进行锚索、锚杆强支护或反压回填注浆固结进洞的方式,这些传统施工方法开挖工程量大、强支护成本高、对自然环境破坏大,增加边坡垮塌风险。采用半明半暗方法进洞大大降低洞口段偏压侧边坡开挖高度,保证了施工过程中的稳定,降低了安全风险,加快了施工速度。Tunnel portals in mountainous area are often located in gully terrain, resulting in bias pressure at the portals. The construction of the opening is more difficult and accompanied by greater safety risks. Under the gully terrain, the traditional construction method is mainly to consolidate the tunnel by excavating a large area of the mountain, then carrying out strong support with anchor cable and bolt or backfilling grouting with backpressure.These traditional construction methods are characterized by large quantity of excavation works, high cost of strong support and great damage to natural environment, which increase the risk of slope collapse. The excavation height of side slope at bias pressure side of opening section can be greatly reduced by using half-light and halfdark method. It guarantees the stability in the construction process, reduces the safety risk and accelerates the construction speed.

关 键 词：冲沟大偏压 半明半暗 大管棚 套拱 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]