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该文以客运专线贵广线三都隧道为依托,采用现场试验方法,研究贵州地区炭质板岩软弱地层隧道施工过程中围岩变形特性、围岩压力,以及支护结构受力特征。现场精细化描述三都隧道掌子面炭质板岩节理信息。研究结果表明:隧道拱顶下沉和水平收敛较大,提前施作二次衬砌可有效抑制大变形及其引起的坍塌。围岩压力以竖向为主,拱顶锚杆轴力最大,建议加长拱部锚杆长度,边墙锚杆参数不变。二次衬砌拱顶和拱脚衬砌处于大偏心抗裂力学状态,成为结构关键控制截面,建议加强拱顶内侧、墙脚外侧配筋,提高结构整体安全性。
Based on the Sanduang Tunnel of Guiyang-Guangzhou Railway, a field test was conducted to study the deformation characteristics of surrounding rock and the pressure of surrounding rock during the tunnel construction in the carbonaceous slate weak area in Guizhou Province and the mechanical characteristics of the supporting structure. On-site refinement description Sandu tunnel face carbonaceous slate joints information. The results show that the settlement of the tunnel dome and horizontal convergence are large, and the secondary lining can be applied in advance to effectively suppress the large deformation and the collapse caused by it. The pressure of surrounding rock is mainly vertical, and the axial force of vault anchor is the largest. It is suggested that the length of anchor bolt should be lengthened and the parameters of the anchor of side wall should not change. The secondary lining vault and arch foot lining are in the state of large eccentric cracking resistance and become the key control section of the structure. It is suggested to reinforce the reinforcement inside the vault and the outside of the wall and foot so as to improve the overall structural safety.