高黎贡山隧道工程地质条件复杂，断层破碎带、节理密集带等不良地质易造成TBM卡机事故。为有效避免TBM卡机事故的发生，以TBM穿越高黎贡山隧道燕山期花岗岩地层为背景，提取卡机段采用TSP法(tunnel seismic prediction)获取的围岩力学参数，通过分析TSP参数的相关性以及对比分析卡机段和正常掘进Ⅴ级围岩段的TSP参数，获取TSP参数与围岩的相关性及卡机段TSP参数的波动规律。研究结果表明： 1）随着泊松比的增大，卡机段的围岩纵波速度呈下降趋势，岩体的静态弹性模量总体呈现降低的趋势； 2）对比正常掘进Ⅴ级围岩段，卡机段TSP法获取的围岩纵波速度、静态弹性模量、波阻抗均有不同程度的下降，而泊松比则有增大的趋势。通过层次分析法理论，对围岩纵波速度、泊松比、静态弹性模量和波阻抗进行定量分析，一定程度上可作为TBM掘进过程中卡机判别的依据。
The complex and unfavorable geological conditions of
Gaoligongshan tunnel, such as fault and fractured zones and joint concentrated
zones can easily cause tunnel boring machine (TBM) jamming accidents.
Accordingly, the mechanical parameters of surrounding rocks obtained from tunnel
seismic prediction (TSP) method at TBMjammed section when crossing
Yanshanian granite formation of Gaoligongshan tunnel are extracted. The
correlation of TSP parameters is analyzed, and the TSP parameters at the TBM
jammed section are compared with those at the normal tunneling section to
obtain the correlation between the TSP parameters and surrounding rock, as well
as the fluctuation law of the TSP parameters. The following are the findings:
(1) with an increase in the Poisson′s ratio, the
longitudinal wave velocity of the surrounding rock in the TBMjammed section and the horizontal wave velocity decreases, whereas
the static Young′s modulus of the rock mass shows a
decreasing trend and (2) compared with the normal tunneling section in Grade V
surrounding rock, the longitudinal wave velocity, static elastic module, and
wave impedance obtained from the TSP method at the TBMjammed
section decreases, whereas the Poisson′s ratio shows an
increasing trend. Finally, the longitudinal wave velocity, Poisson′s ratio, static Young′s modulus, and wave
impedance are quantitatively analyzed using the analytic hierarchy process
theory, which can be used as a basis for judging the TBM jamming during the
tunneling process to a certain extent.
