摘要
大部分隧洞工程出现超挖的部位是洞壁和顶拱,其中一重要因素是爆破影响。吉牛水电站引水隧洞结合生产性爆破试验后爆破参数合理,洞壁和顶拱开挖较为平整,但底板超挖问题严重。分析其原因主要为隧洞开挖过程中施工积水和运碴车轮压循环荷载的影响。针对以上原因,提出了及时跟进短锚杆加固底板围岩的方案。经过数值分析,该方案能较好地控制吉牛水电站底板的超挖问题。
Most of the tunnel overbreak areas appear in the cave walls and crowns. One of the important factors is the effect caused by blasting. Due to the combination of the productive blasting tests, the blasting parameters are so reasonable that the cave walls and crowns of the Jiniu Hydropower Station Diversion Tunnel are relatively flat, but there is a serious problem of overbreak at the base. Through an analysis of the problem, it turns out to be the effect of construction water and wheel pressure of cyclic loading in the process of tunnel excavation. For the above reasons, this paper presents the timely follow--up of short anchor to reinforce the sur-rounding rock of the floor. Through a numerical analysis, the scheme can control the overbreak of Jiniu Hydropower Station floor well.
出处
《中国农村水利水电》
北大核心
2014年第2期92-94,97,共4页
China Rural Water and Hydropower
关键词
底板超挖
施工积水
运碴车轮压
及时跟进短锚杆
overbreak at the base
construction water
wheel pressure of cyclic loading
timely follow-up of short anchor
