高地应力条件下Q系统在某勘探洞围岩分类中的应用

西南地区某水电站勘探洞高地应力是一个突出问题,高地应力洞段岩体属于坚硬岩或较坚硬岩,主要破坏方式是岩爆。高地应力区非岩爆岩体中未见结构性流变和软岩塑性流动等变形破坏现象,岩体质量较好。通过对岩体质量分类Q系统在该勘探洞高地应力洞段的应用,发现Q系统对于高地应力区非岩爆段岩体没有给出相应的SRF值;岩爆的发育条件是多方面的,但Q系统对岩爆的发育条件考虑较单一,所以它在高地应力区岩爆段的分类结果不能准确地体现出岩爆的等级和围岩类别。基于这2个问题,本文对Q系统做了相应的修改,以适应该勘探洞围岩分类,从修改后Q系统的分类结果看,效果良好。

Application of Q-System in Classification of Surrounding Rock in Tunnel under High Ground-Stress

Through the application of Q-System in quality classification about rock on high ground-stress segment in an exploring tunnel of a hydroelectric station, we have found that Q-System could not provide relevant SRF value on the non-rockburst segment in the region of high ground-stress and the calculated developing conditions of rockburst are rather unilaterally, so that the classified result of the rockburst segment in the region of high ground-stress cannot exactly manifest the rates of the roekburst in exploring tunnel and the sorts of the surrounding rock. Based on these, the author of this article make some relevant modification to Q-System, and through the classified result of the modified Q-System, the applicability proved correct.