巴基斯坦尼拉姆—吉拉姆水电站地下厂房围岩稳定反演分析

发布时间：2018-06-07 15:57

本文选题：尼拉姆—吉拉姆水电站 + 地下厂房　；参考：《水利水电技术》2017年10期

【摘要】：为了反演尼拉姆—吉拉姆水电站地下厂房开挖及支护过程,分析施工中出现问题的原因并给出优化方案,结合工程施工期安全监测资料及地质资料,采用通用岩土分析软件MIDAS GTS NX,考虑材料非线性、不同岩性材料分区及软弱夹层地质构造的影响,选取摩尔库伦本构模型对地下厂房、主变洞室及母线洞、尾水洞开挖支护过程进行有限元模拟,提出优化结构方案并对其进行验算。结果表明:反演计算结果与现场监测资料基本吻合,软弱夹层对围岩收敛变形及应力分布有较大影响;采用优化方案后,模型最大位移分布区域较初始模型有所减小;初始模型塑性区为洞室跨度的0.57倍,优化后塑性区降为洞室跨度0.4倍。研究成果可为类似地下厂房设计提供参考。
[Abstract]:In order to invert the excavation and support process of the underground powerhouse of Nilam-Jielam Hydropower Station, the causes of the problems in the construction are analyzed and the optimization scheme is given. The safety monitoring data and geological data during the construction period are combined. The general geotechnical analysis software MIDAS GTS NX, is used to consider the influence of material nonlinearity, different lithologic material zoning and weak intercalation geological structure. The Moore Coulomb constitutive model is selected for underground powerhouse, main transformer cavern and busbar cavern. The finite element simulation is carried out on the excavation and support process of tailrace tunnel, and the optimized structure scheme is put forward and checked. The results show that the inversion results are in good agreement with the field monitoring data, and the weak intercalation has a great influence on the convergence deformation and stress distribution of surrounding rock, and the maximum displacement distribution area of the model is smaller than that of the initial model. The plastic zone of the initial model is 0.57 times of the span of the cavern, and the plastic zone of the optimized model is 0.4 times of the span of the cavern. The research results can provide reference for similar underground powerhouse design.
【作者单位】：中水北方勘测设计研究有限责任公司;
【分类号】：TV223;TV731.6

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