软岩隧道Ⅳ~Ⅵ级围岩相似材料正交试验研究
연암수도Ⅳ~Ⅵ급위암상사재료정교시험연구
Research on Similar Materials for Class Ⅳ ~ Ⅵ Surrounding Rock of Weak Rock Tunnel Based on Orthogonal Experiment
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