引汉济渭工程隧洞施工若干技术问题探讨

发布时间：2018-05-31 04:51

  本文选题：引汉济渭工程 + 隧洞施工　； 参考：《水利水电技术》2017年08期

【摘要】：基于引汉济渭工程隧洞施工实际,结合我国现有技术规范要求,对比分析了引汉济渭工程隧洞动态设计、超前地质预报、隧洞开挖方式、隧洞支护时效及衬砌与掌子面距离等五个方面的问题,得到了适宜引汉济渭工程隧洞施工特点的动态施工技术方法。针对不同围岩条件实施隧洞动态设计,采用了不同的开挖和支护方式。对物探发现的异常区进行钻探验证,以提高地质超前预报及涌水预测精度。地质复杂区段按照"物探先行,钻探验证,有掘必探,先探后掘"的原则组织施工。在实际施工中,应提倡利用围岩在无支护条件下的允许暴露时间也就是围岩的自稳时间实现短距离的掘进与支护分离。对硬岩(Ⅰ—Ⅲ)围岩采用"钻爆设计、光爆施工、工序组织、快速施工"的思路,对软岩(Ⅳ—Ⅴ)围岩采用"围岩量测、确保安全、遵守设计、按部就班"的思路。
[Abstract]:Based on the tunnel construction practice of the diversion from Han to Jiwei engineering and the existing technical specifications of our country, this paper compares and analyzes the dynamic design of the tunnel, the advanced geological forecast and the excavation mode of the tunnel in the diversion from Han to Jiwei engineering. In this paper, the dynamic construction technique method suitable for the tunnel construction characteristics of Han Jiwei engineering is obtained from five aspects, such as the time limit of tunnel support and the distance between lining and face. According to different surrounding rock conditions, different excavation and support methods are adopted for dynamic tunnel design. In order to improve the accuracy of geological prediction and water inflow prediction, the abnormal areas discovered by geophysical exploration are drilled and verified. Geological complex section is organized according to the principle of "geophysical exploration first, drilling verification, drilling must be explored, first exploration and then excavation" principle. In actual construction, the allowable exposure time of surrounding rock under the condition of no support should be used to realize short distance excavation and support separation. The idea of "drilling and blasting design, smooth blasting construction, working procedure organization and rapid construction" is adopted for the surrounding rock of hard rock (鈪，

本文编号：1958356