大型地下洞室开挖支护弹塑性损伤有限元分析

发布时间：2018-04-25 10:46

本文选题：弹塑性损伤 + 有限元分析　；参考：《人民黄河》2017年08期

【摘要】：应用弹塑性损伤有限元理论,采用增量荷载变刚度迭代法,对地下厂房洞室群的稳定性进行三维数值模拟,以判定地下厂房洞室群布置、施工开挖顺序、围岩支护参数的合理性。模拟计算结果表明:围岩的破坏区基本限制在洞周2~6 m范围内,洞周位移为2~5 cm,围岩应力分布较均匀,整体稳定状态较好,说明采用的开挖方式和锚固支护参数基本是合理。但在洞室交岔口和断层穿过的部位,锚杆应力和洞周位移偏大,在断层处局部破坏范围也较大,这些部位的稳定条件稍差,在施工中可增加一些随机锚杆和锚索进行支护。通过施工过程中监测数据与计算结果的对比分析,验证了三维弹塑性损伤力有限元计算的正确性。
[Abstract]:Based on the elastic-plastic damage finite element theory and the incremental load variable stiffness iteration method, the stability of underground powerhouse cavern group is simulated by three-dimensional numerical simulation in order to determine the layout of underground powerhouse cavern group and the order of construction and excavation. The rationality of surrounding rock support parameters. The simulation results show that the failure zone of the surrounding rock is basically limited within 2 ~ 6 m around the hole, the displacement around the hole is 2 ~ 5 cm, the stress distribution of surrounding rock is more uniform, and the overall stability is better, which indicates that the excavation method and the parameters of anchor support are basically reasonable. However, the stress of bolt and displacement around the hole are larger and the local failure range is larger at the intersection of the tunnel and the fault. The stability condition of these parts is a little bad, and some random anchors and cables can be added to support in the construction. Through the comparison and analysis of the monitoring data and the calculated results during the construction process, the correctness of the finite element calculation of the three dimensional elastoplastic damage force is verified.
【作者单位】：西南石油大学土木工程与建筑学院;华能西藏发电有限公司;
【分类号】：TV554

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