当金山隧道区域地应力特征分析与应用

发布时间：2018-10-05 17:22

【摘要】：研究目的:敦格铁路当金山隧道位于兴蒙褶皱系与祁连山褶皱系之间的阿尔金断隆,隧道埋深大,地质条件复杂,高地应力是隧道施工中的主要地质问题。通过对隧道区域地应力特征分析,分析预测隧道施工中与高地应力有关的地质问题。研究结论:(1)当金山隧道区地应力高,以水平应力为主,属高地应力区;(2)根据切向应力准则判断,隧道施工中埋深较大地段较完整的云母石英片岩、花岗岩有发生轻微岩爆的可能,绿泥石英片岩发生岩爆的可能性小;(3)根据隧道区的地应力特征及岩性特征分析,断层破碎带(尤其是F5断层)岩质软弱,在施工中有发生较大变形的可能,其他地段发生变形的可能性较小;(4)本文采用的隧道地应力分析与评价方法及与高地应力有关主要地质问题的分析,对类似工程具有参考和借鉴意义。
[Abstract]:Research purpose: Dangjin Tunnel of Dung Railway is located between Xingmeng fold system and Qilian Mountain fold system. The tunnel buried deep and the geological conditions are complicated. High ground stress is the main geological problem in tunnel construction. The geological problems related to high in-situ stress in tunnel construction are analyzed and predicted by analyzing the characteristics of in-situ stress in tunnel area. The conclusions are as follows: (1) when the ground stress in Jinshan Tunnel is high, the horizontal stress is the main one, which belongs to the high ground stress area; (2) according to the criterion of tangential stress, the mica quartz schist, which is relatively deep buried in the tunnel construction, is relatively complete. There is a possibility of a slight rock burst in granite and a small possibility of rock burst in green-mud quartz schist. (3) according to the characteristics of in-situ stress and lithology in the tunnel area, the rock quality of fault fracture zone (especially F5 fault) is weak. There is a possibility of large deformation in construction, but the possibility of deformation in other areas is small. (4) the analysis and evaluation method of tunnel ground stress adopted in this paper and the analysis of main geological problems related to high ground stress. It has reference and significance for similar projects.
【作者单位】：中铁第一勘察设计院集团有限公司;
【分类号】：U452.11

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