本文選題：尼拉姆—吉拉姆水電站 + 地下廠房��； 參考：《水利水電技術(shù)》2017年10期

【摘要】：為了反演尼拉姆—吉拉姆水電站地下廠房開(kāi)挖及支護(hù)過(guò)程,分析施工中出現(xiàn)問(wèn)題的原因并給出優(yōu)化方案,結(jié)合工程施工期安全監(jiān)測(cè)資料及地質(zhì)資料,采用通用巖土分析軟件MIDAS GTS NX,考慮材料非線性、不同巖性材料分區(qū)及軟弱夾層地質(zhì)構(gòu)造的影響,選取摩爾庫(kù)倫本構(gòu)模型對(duì)地下廠房、主變洞室及母線洞、尾水洞開(kāi)挖支護(hù)過(guò)程進(jìn)行有限元模擬,提出優(yōu)化結(jié)構(gòu)方案并對(duì)其進(jìn)行驗(yàn)算。結(jié)果表明:反演計(jì)算結(jié)果與現(xiàn)場(chǎng)監(jiān)測(cè)資料基本吻合,軟弱夾層對(duì)圍巖收斂變形及應(yīng)力分布有較大影響;采用優(yōu)化方案后,模型最大位移分布區(qū)域較初始模型有所減小;初始模型塑性區(qū)為洞室跨度的0.57倍,優(yōu)化后塑性區(qū)降為洞室跨度0.4倍。研究成果可為類似地下廠房設(shè)計(jì)提供參考。
[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.
【作者單位】： 中水北方勘測(cè)設(shè)計(jì)研究有限責(zé)任公司;
【分類號(hào)】：TV223;TV731.6

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