雅鲁藏布江峡谷段某深埋隧道岩爆特征分析
发布时间：2019-03-21 19:45
【摘要】：拉萨至日喀则铁路以隧道形式穿越雅鲁藏布江峡谷段。受区域地质环境的影响,区段内盆因拉围岩内构造应力集中,施工过程中岩爆问题突出。在对现场地应力数据和隧道围岩物理力学特性参数的实验测试的基础上,分析了盆因拉深埋隧道花岗岩、片麻岩和闪长岩围岩体的弹性应变能、强度和变形脆性系数以及弹性应变能等指标,进而分析了围岩体岩爆倾向。利用MIDAS有限元软件计算了隧道洞壁最大切向应力,应用Russeness和Barton判据对围岩岩爆强度进行了评判。其中花岗岩具有轻微—中等岩爆倾向;片麻岩具有中—强岩爆倾向,局部具有轻微岩爆倾向;闪长岩具有强岩爆倾向,局部具有轻微—中等岩爆倾向。计算结果和施工监测结果一致,研究结论为该区域类似工程施工提供了参考。
[Abstract]:The Lhasa-Xigaze railway tunnels through the Yarlung Zangbo Valley. Under the influence of the regional geological environment, the tectonic stress concentration in the basin surrounding rock is concentrated in the section, and the rock burst problem is prominent in the construction process. The elastic strain energy of granite, gneiss and diorite surrounding rock in basin drawing is analyzed on the basis of in-situ stress data and physical and mechanical parameters of surrounding rock of tunnel, and the elastic strain energy of granite, gneiss and diorite surrounding rock mass in basin drawing is analyzed. The strength and deformation brittleness coefficient and elastic strain energy, etc., are used to analyze the rock burst tendency of surrounding rock mass. The maximum tangential stress of tunnel wall is calculated by using MIDAS finite element software. The rock burst strength of surrounding rock is evaluated by Russeness and Barton criteria. The granite has the tendency of mild to medium rockburst, the gneiss has the tendency of moderate to strong rockburst, and the diorite has the tendency of strong rockburst, and the diorite has the tendency of mild to moderate rockburst. The calculated results are consistent with the results of construction monitoring, and the research conclusions provide a reference for similar projects in this area.
【作者单位】： 西南石油大学地球科学与技术学院;
【基金】：中国铁路总公司重大课题(2013G014-B)
【分类号】：U456.3
[Abstract]:The Lhasa-Xigaze railway tunnels through the Yarlung Zangbo Valley. Under the influence of the regional geological environment, the tectonic stress concentration in the basin surrounding rock is concentrated in the section, and the rock burst problem is prominent in the construction process. The elastic strain energy of granite, gneiss and diorite surrounding rock in basin drawing is analyzed on the basis of in-situ stress data and physical and mechanical parameters of surrounding rock of tunnel, and the elastic strain energy of granite, gneiss and diorite surrounding rock mass in basin drawing is analyzed. The strength and deformation brittleness coefficient and elastic strain energy, etc., are used to analyze the rock burst tendency of surrounding rock mass. The maximum tangential stress of tunnel wall is calculated by using MIDAS finite element software. The rock burst strength of surrounding rock is evaluated by Russeness and Barton criteria. The granite has the tendency of mild to medium rockburst, the gneiss has the tendency of moderate to strong rockburst, and the diorite has the tendency of strong rockburst, and the diorite has the tendency of mild to moderate rockburst. The calculated results are consistent with the results of construction monitoring, and the research conclusions provide a reference for similar projects in this area.
【作者单位】： 西南石油大学地球科学与技术学院;
【基金】：中国铁路总公司重大课题(2013G014-B)
【分类号】：U456.3
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