On the Tunnel Support Mechanism of Shotcrete

喷射混凝土隧道支护机理探讨

• 批准号: 10555168
• 负责人: TAMURA Takeshi
• 金额: $ 3.07万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555168/
• 关键词: Tunnel; NATM; Earth Pressure; Shotcrete; Lining; Overburden; Loothening; Ground Reaction; 吹き付け; 覆工

The mechanical effect of the interaction between the shotcreting and the ground is studied from a view point of the tunnel support stability. A serial set of rigid bars jointed through the bending springs are adopted for a model of the lining while the constant coefficient of subgrade reaction is assumed for the ground. A lot of parametric numerical analyses are done by changing the width of shotcreting, the coefficient of the lateral earth pressure, the overburden and the shape of tunnel section. It is shown that the subgrade reaction is essential for the tunnel stability and that even a thin shotcrete lining supports the surrounding ground if an adequate amount of the subgrade reaction is expected. Other conclusions are as follows.1) The sugrade reaction reduces the bending moment of the shotcrete lining by controlling the deformation around the tunnel.2) The thin shotcrete lining may cause a large amount of bending moment.3) The thin shotcrete lining is preferred unless the buckling occurs.4) Even when bending failure occurs in the shotcrete lining, no serious damage is resulted if a sufficient ground reaction is expected.A further research is required concerning the tunnel stability since the present study was done through a very simple mechanical model.

从隧道支护稳定性的角度研究了喷射混凝土与地层相互作用的力学效应。衬砌模型采用一组由弯曲弹簧连接的刚性杆，地基土反力系数假定为常数。通过改变喷射混凝土宽度、侧土压力系数、覆盖层厚度和隧道断面形状等参数，进行了大量的数值分析。结果表明，路基反应是必不可少的隧道的稳定性，即使是薄的喷射混凝土衬砌支持周围的地面，如果有足够的路基反应预计。其它结论如下：1）路基反力通过控制隧道周围的变形来减小喷射混凝土衬砌的弯矩; 2）薄的喷射混凝土衬砌可能会产生很大的弯矩; 3）除非发生屈曲，否则优选薄的喷射混凝土衬砌; 4）即使喷射混凝土衬砌发生弯曲破坏，由于目前的研究是通过一个非常简单的力学模型进行的，因此需要进一步研究隧道的稳定性。

项目成果

Tamura,Takeshi: "Mechanics of Assembly of Rigidarticles"Rroc. Localization and Bi furcation Theory. 1. 181-188 (1999)

Tamura，Takeshi：“刚性物品组装力学”Rroc。

Tamura, Takeshi: "Mechanics of assembly of rigid particles"Proc. Localization and Bifurcation Theory. Vol.1. 181-188 (1999)

田村武：“刚性粒子组装力学”Proc。

Tamura, Takeshi: "Upper bound method of rigid particles and its application"Journal of Applied Mechanics, JSCE. Vol.1. 407-416 (1998)

Tamura, Takeshi：“刚性粒子的上限方法及其应用”应用力学杂志，JSCE。

田村 武: "鋼体要素からなる粒状体の上界法とその応用"応用力学論文集. 1. 407-416 (1998)

Takeshi Tamura：“由钢元素组成的颗粒体的上限方法及其应用”《应用力学杂志》1. 407-416 (1998)。

Teramoto, Tadashi: "An experiment of tunnel in steel rod layer"Proc.JSCE. No.631, III-48. 495-498 (1999)

Teramoto, Tadashi：“钢棒层隧道实验”Proc.JSCE。