中天山隧道地应力测量及岩爆预测研究

在勘察设计阶段研究越岭隧道区域内的现代地应力特征,可以为越岭隧道选线设计、隧道断面设计及隧道二次衬砌设计提供依据,并揭示出施工中可能发生岩爆的具体段落.介绍了应用钻孔内水压致裂法进行地应力测试,确定出隧道通过区岩体的原地应力大小和方向.根据原地应力测量成果,综合分析钻孔附近地层地应力的基本特征,结合隧道通过区各类型地层...

Study of the Crustal Stress Survey and Rock Burst Prediction for the Zhongtianshan Tunnel

At the survey and design stage,making a study of the modern features of the crustal stress in the region of an uphill tunnel may provide technical grounds for the design of routing an uphill tunnel,its cross-section,and the 2nd lining of the tunnel,with the specific likely rock burst sections during the construction exposed.In the paper described is the application of the stress test of hydraulic fracturing in borehole conducted to determine the stress magnitude and directions of the rock mass in situ of the region through which the tunnel goes.By analyzing the results obtained from the survey,making comprehensive analyses of the basic characteristics of the stress of the formation near the borehole,and taking account of the features of the engineering geology,physical and mechanical properties of the various strata of the region through which the tunnel goes,the possibilities of rock burst in different strata during the excavation of the tunnel are analyzed.Our construction practice shows that both the stress measurement and rock burst prediction are correct,which play a positive role in the prediction of rock burst.