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基于对现场地质条件和开挖响应的直观认识和对岩石室内试验所得物理力学特性的深刻揭示,建立了深埋条件下软弱围岩大变形挤压程度分级方法及相对应的安全系数计算方法。该方法考虑到隧洞原岩集聚的能量过大是造成开挖后围岩失稳的根本原因,将隧洞原岩能量和围岩的总变形与弹性变形之比相结合,分析了隧洞的围岩稳定性状况,并在此基础上通过增减隧洞原岩能量得到了其安全系数。通过实际工程应用及与传统经验评价方法的对比,验证了该方法的合理性与适用性。该方法考虑了围岩的地质情况、断面形状、尺寸、开挖方式等多种因素,弥补了传统经验评价方法无法适应复杂多变的现场工程施工情况的不足,更加贴近实际。可为大变形隧洞的安全预测、开挖方案、支护设计等提供重要参考依据。
Based on the intuitive understanding of on-site geological conditions and excavation response and the deep revealing of the physical and mechanical properties of rock laboratory tests, a method of grading the large deformation and compression of surrounding rock under deep-buried conditions and the corresponding safety factor calculation method are established. The method takes into account the energy accumulation of the original rock mass is the root cause of the surrounding rock instability after excavation. By combining the original rock energy of the tunnel and the total deformation and elastic deformation ratio of the surrounding rock, the surrounding rock of the tunnel Based on this, the safety factor is obtained by increasing or decreasing the original rock energy of the tunnel. Through the comparison of the practical engineering application and the traditional experience evaluation method, the rationality and applicability of the method are verified. The method takes into account the geological conditions of the surrounding rock, the shape and size of the cross section, the excavation method and other factors to make up for the shortcoming of the traditional experience evaluation method that can not adapt to the complex and changeable field construction situation and is more realistic. It can provide important reference for the safety prediction of large deformation tunnel, excavation scheme and support design.