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中国又一工程惊艳世界:长城下有座世界最深高铁站

2017-08-14 15:21:06   海外网

同时,长城站需要通过花岗杂岩地层,岩性种类多,成分变化大,风化差异明显,地质条件也非常复杂。

△花岗岩山体

地下交通调度也是挑战

施工高峰期13个工作面在逼仄的地下同时作业。仅2号斜井,就设置8条分通道,地下物流、交通等组织也是个挑战。

△施工现场

爆破难度大

地上有世界文化遗产、还有老京张铁路,施工中需要严格控制爆破对山体的影响。此外,地下洞室密集,爆破还不能造成相邻洞室围岩松动、支护变形等,难度非常大。

“没有金刚钻不揽瓷器活”,中国技术再升级!

在记者采访过程中,世界首次、国内首创这些词语在专家们口中出现的频率很高。我国高铁里程已突破2万公里,技术逐渐成熟并不断创新。

创新“品”字工法

专家说,长城站隧道采用大跨度设计,如果用传统的“挪威法”,步骤比较多,施工时间也较长。专家们经过钻研,提出“品字形”施工工法,顶洞超前探明地质、分部开挖化大为小、预留核心提供支撑、工法简洁转换自如,既可以安全快速施工,也方便大型机械展开。

△品字施工法

电子雷管爆破

通过使用电子雷管精细化分段,逐孔起爆,能将振速控制在安全范围内,保护文物也确保施工质量。2016年3月开工以来,这里已经爆炸了4500多次,每天要炸十几次。

△电子雷管

目前,总体工程已经完成总体工程的40%左右,争取2019年底前实现京张高铁建成通车。

责任编辑:韩佟 CL1368
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