摘要
为指导施工,提高施工的安全性和经济性,对西周岭隧道进行了钻孔水压致裂法地应力测量。测试结果表明：西周岭隧道深埋段地应力场以水平应力为主,在测试深度内最大水平主应力值为10.57~19.39MPa,具中等偏高应力水平;最大水平主应力方向为近N33°W,与隧道走向的夹角较小,即地应力对隧道围岩稳定性较为有利。基于地应力实测结果,本文采用Hoek判据、Turchaninov判据、Russenes判据和工程岩体分级标准等4种判别方法进行岩爆预测,并分析了发生岩爆的临界深度,认为西周岭隧道深埋段有发生轻微-中等岩爆的可能,发生岩爆的临界埋深厚度约为397m。因此,在施工过程中应采取合理的开挖方式及防岩爆安全措施,防止岩爆灾害的发生。
In order to guide construction and improve the safety and economy of construction,hydro-fracturing stress measurements have been conducted for Xizhouling tunnel of Zhejiang Province.It is found that the most important stress direction is the horizontal direction in the surveyed area.Within the measured depths,the maximum horizontal stress is of 10.57～19.39MPa.This stress level can be classified as middle to high level in this deep-seated tunnel.The dominant direction of the maximum horizontal stress is about N33°W.The angle between the direction of the maximum horizontal stress and the direction of the tunnel axis is relatively small for this tunnel,and favorable to the stability of the tunnel and the surrounding rock mass.Based on the in-situ stress results and four distinguished methods（i.e.,Hoek method,Turchaninov method,Russenes method and engineering rock quality classification standard）rockbursts are forecasted during tunnel construction in the deep-seated tunnel conditions.The critical buried depth of rockburst is estimated.The results show that there are high possibilities of occurring weak and moderate rockbursts in this tunnel.The critical buried depth of rockburst is about 397m.In order to avoid the disadvantage conditions,reasonable excavation method and safety precautions should be adopted during the tunnel construction.
出处
《工程地质学报》
CSCD
北大核心
2011年第3期428-432,共5页
Journal of Engineering Geology
关键词
西周岭隧道
水压致裂法
地应力测量
岩爆
Xizhouling tunnel
Hydro-fracturing method
In-situ stress measurement
Rockburst forecast
