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地应力是由于地质构造形成的岩体内部的应力,其分布异常经常造成隧道施工的岩爆危害。利用常用的水压致裂法,获取了某公路隧道最深处的地应力分布特征,最大水平主应力值σH=15.87MPa、最小水平主应力值σh=11.25 MPa、自重应力值σV=13.50 MPa。在此基础上,利用工程岩体分级标准判别法、Russenes判别法、Turchaninov判别法、Hoek判别法等4种岩爆判别法对其进行了定性或定量评价。各方法均认为该隧道不存在产生岩爆的可能,该地应力条件下隧道施工是安全的。该方法体系可供类似隧道的岩爆评价作为参考。
Intrinsic stress is the stress inside the rock mass formed by the geological structure. The abnormal distribution often causes the rock burst of the tunnel construction. The common stress fracturing method was used to obtain the distribution of the stress in the deepest part of a highway tunnel. The maximum horizontal principal stress σH = 15.87MPa, the minimum horizontal principal stress σh = 11.25 MPa and the self-weight stress σV = 13.50 MPa. On the basis of this, qualitative and quantitative evaluation is made by using four kinds of rockburst discriminating methods, such as classification criteria of engineering rock mass, Russenes discriminant method, Turchaninov discriminant method and Hoek discriminant method. Each method considers that there is no possibility of rockburst in the tunnel and the tunnel construction is safe under the stress conditions. This method system can be used as tunneling rock burst evaluation.