论文部分内容阅读
迄今为止,岩爆研究已有诸多理论及成果,但岩爆仍然是一个世界性的难题,在隧道开挖过程中,极大地威胁着施工人员及施工设备的安全。古迹坪隧道为兰渝铁路全线高风险隧道之一,在隧道埋深较大、硬脆岩性局部地段具备产生岩爆的地质条件下,开展古迹坪隧道岩爆预测研究对该隧道安全施工具有重要的意义。基于平面应变问题建模对古迹坪隧道进行了数值模拟有限元分析,得出了隧道研究区段某一截面开挖后的二次应力场重分布相关特征,基于隧道工程土工测试数据和计算截面数值模拟分析结果,选取四种具有代表性的单指标岩爆数据对古迹坪隧道研究区段某一截面进行了岩爆预测研究,最终得出研究区段计算截面具有产生低~中等岩爆灾害的结论,对研究区段隧道开挖施工具有一定的指导意义。
So far, there have been many theories and achievements in rockburst research. However, rockburst remains a worldwide problem, which greatly threatens the safety of construction workers and construction equipment during tunnel excavation. The historic Ping Tunnel is one of the high-risk tunnels in Lanzhou-Chongqing Railway. Under the geological conditions of large depth of the tunnel and the presence of rockburst in the local areas of hard and brittle lithology, Significance. Based on the model of plane strain problem, the numerical simulation finite element analysis of the tunnel was carried out. The secondary stress field redistribution related characteristics of a section of the tunnel were obtained. Based on the tunnel engineering geotechnical test data and calculation section Numerical simulation results show that the rockburst prediction of a certain section of the study site in the ancient track Pingtung tunnel is selected from four representative single-index rockburst data. Finally, it is concluded that the calculated section of the study section has low- The conclusions of the study of tunnel excavation section of a certain significance.