快速硬化型喷射混凝土的适用性及在崤山隧道中的应用

依托蒙华铁路崤山隧道工程,建立了考虑喷射混凝土硬化过程的围岩-支护耦合模型,研究在不同围岩级别条件下,不同硬化速率的喷射混凝土对围岩变形的影响,并在崤山隧道Ⅴ级围岩段进行现场喷射试验。研究结果表明:喷射混凝土硬化速率对隧道围岩变形具有一定影响,且围岩越差变形控制效果越好,在Ⅳ,Ⅴ,Ⅵ级围岩中,与常规硬化喷射混凝土相比,快速硬化喷射混凝土拱顶沉降可分别减小5. 61%,7. 92%,8. 09%,最大水平收敛可分别减小1. 47%,9. 72%,12. 10%;在崤山隧道Ⅴ级围岩段拱顶沉降可减小24. 25%。

Applicability of Rapid Hardening Shotcrete and Its Application in Xiaoshan Tunnel

Based on the Xiaoshan tunnel project of the Mongxi-Huazhong railway,a coupling model of surrounding rock and support considering the hardening process of shotcrete was established.The inf luence of shotcrete with different hardening rates on the deformation of surrounding rock was studied under different surrounding rock grades and the f ield shotcrete tests were carried out in the Ⅴ grade surrounding rock section of Xiaoshan tunnel.The research results show that the hardening rate of shotcrete has a certain inf luence on the deformation of surrounding rock,and the worse the surrounding rock is,the better the deformation control effect will be.Compared with conventional hardening shotcrete,the vault settlement of rapid hardening shotcrete can be reduced by 5.61 %,7.92 % and 8.09 % respectively,and the maximum horizontal convergence can be reduced by 1.47 %,9.72 % and 12.10 % respectively in Ⅳ,Ⅴ and Ⅵ grade surrounding rocks.The vault settlement of Ⅴ grade surrounding rock section of Xiaoshan tunnel can be reduced by 24.25 %.