软硬不均砾岩水工隧洞项目若干问题分析

Several Problems about Hydraulic Tunnel Project in Complex Uneven Conglomerate Strata

第三系灵山组砾岩胶结程度较差,且软硬不均,该地层中修建水工隧洞难度颇大。保定市大水系湾子隧洞主洞全长4468m,在第三系地层中修建如此规模的隧洞在河北省尚属首例。煤矿悬臂式非全断面掘进机在该工程中的应用,为水工隧洞施工提供了新思路和成功范例。以此为例,说明在第三系砾岩等类似特殊地质条件下修建水工隧洞,在满足相关规范的基础上提高勘察精度、加强施工地质工作、引进或应用先进方法,以及解决由此带来的诸如相关定额和规范的修编等问题,是水利水电工程顺利进行的重要条件。

It is very difficulty that long distant hydraulic tunnel is built in complex uneven Lingshan Fm. of Tertiary section. The length of Wanzi-tunnel, which is the part of the big water system engineering of Baoding City, is 4468 meters. The scale of the tunnel built in Tertiary section was the first in Hebei Province. Coal boom-type partial-section roadheader is used in the project. New idea and successful example is provided for hydraulic tunnel hole. Based on the project, the paper explains that there are important conditions for building water conservancy and hydropower projects smoothly, namely, improving survey precision higher than related standard requirement, strengthening the geological work of construction stage, intrudueing or using advanced methods and solving some problems such as relevant norm and standard revision.