壁板坡隧道施工期可溶岩段涌水特征分析
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摘要
壁板坡隧道为沪昆客运专线最长隧道,隧址区水文地质条件复杂,可溶岩段占隧道总长的68.53%。基于施工地质及长期涌水观测认为,隧址区可溶岩中的过水通道沿垂向可分为强烈溶蚀段、全贯通式过水通道段和相对独立过水通道段等3段。隧洞涌水与降雨关系密切,涌水滞后效应明显;平导排水效果明显;可采用水均衡原理的降水入渗系数法来分析计算隧道洞身可溶岩段总涌水量,根据施工期间最大涌水量进行反算,宜取参数n≈2.1。
The Bibanpo tunnel where the soluble rock segment occupies 68.53% of the total length is the longest tunnel of shanghai-kunming passenger dedicated line,and the hydrogeological conditions of the tunnel site are complex.Based on the construction geology and longtime observation of the water burst,the water passageway along vertical direction can be divided into 3 segments consist of strong dissolution section,fully through and relatively?independent water section respectively.Moreover,the water burst is closely related to rainfall with a obvious hysteresis effect in the tunnel,and the effect of parallel adit drainage is positive.In the paper,the precipitation infiltration coefficient method based on the water balance principle can be used to calculate the total amount of water burst of the soluble rocksegment in the tunnel.And according to the back calculation to the maximum water outflow during construction,the Parameter n is approximately 2.1.
The Bibanpo tunnel where the soluble rock segment occupies 68.53% of the total length is the longest tunnel of shanghai-kunming passenger dedicated line,and the hydrogeological conditions of the tunnel site are complex.Based on the construction geology and longtime observation of the water burst,the water passageway along vertical direction can be divided into 3 segments consist of strong dissolution section,fully through and relatively?independent water section respectively.Moreover,the water burst is closely related to rainfall with a obvious hysteresis effect in the tunnel,and the effect of parallel adit drainage is positive.In the paper,the precipitation infiltration coefficient method based on the water balance principle can be used to calculate the total amount of water burst of the soluble rocksegment in the tunnel.And according to the back calculation to the maximum water outflow during construction,the Parameter n is approximately 2.1.
引文
[1]徐学渊,屈科.壁板坡隧道岩溶水系统地下分水岭确定及平导位置研究[J].西南交通大学学报,2012,(增刊3):0258-2724.
[2]中铁二院工程集团有限责任公司.长昆线盘县至曲靖段壁板坡隧道工程地质说明书[R].成都:中铁二院工程集团有限责任公司档案馆,2011.
[3]铁道部第二勘测设计院.岩溶工程地质[M].北京:中国中铁出版社,1984.
[4]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.
[2]中铁二院工程集团有限责任公司.长昆线盘县至曲靖段壁板坡隧道工程地质说明书[R].成都:中铁二院工程集团有限责任公司档案馆,2011.
[3]铁道部第二勘测设计院.岩溶工程地质[M].北京:中国中铁出版社,1984.
[4]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.