研究结论: 通过在开挖支护过程中对围岩最大拉压应力、拱顶沉降、地表沉降、锚杆轴力、衬砌最大拉压应力等7 个指标参数的比较,提出优化的开挖方法为单侧壁导坑法,其次是CRD 六洞法,并且采用0. 3 m 厚的喷射混凝土衬砌和5 m 长的锚杆( 间距1. 5 m × 1. 0 m) 作为支护参数。该结论对设计施工具有指导意义。
Abstract:Research purposes: The Badaling Four - line - way Tunnel of the new Beijing - Zhangjiakou Railway is the first tunnel with so large span in China,featured with the span of 27. 3 m,the height of 18 m and the cross section area of 386. 56 m2 . For excavation,the following four excavation methods were planned: the single - wall pilot method,the single rock column method,the CRD four - hole method and the six - hole CRD method. The finite element software was used to make the simulation calculation of the excavation and support processes with the four methods mentioned above for the purpose of getting the optimal construction scheme.
Research conclusions: From the comparison of the seven parameters of the maximum drawing and compressive stresses,the vault settlement,the ground settlement,the axial force of the anchor arm and the maximum drawing and compressive force of the lining,it can be seen the single - wall pilot method is the optimal excavation method,followed by six - hole CRD method,based on taking the 0. 3 m thick spraying concrete lining and 5 m long anchor arm as the support paramters. The research result is reasonable and has the reference to the design and construction.
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