In this paper, the calculation method for karst tunnel
surrounding rock hardness attenuation value ΔRc
and rock integrity attenuation value ΔKv is proposed based on the attenuation law of surrounding rock
hardness Rc and rock
integrity Kv, and then the
calculation method for karst development degree to the correction value of
tunnel surrounding rock classification index BQ karst is obtained. Based on the calculated
karst development degree correction index value BQ karst and the BQ value of different
surrounding rock subgrades of the tunnel, a
quantitative grading method for karst tunnel surrounding rock is proposed; and
based on the main geological engineering conditions of the tunnel, the
qualitative subgrade qualitative classification method
for karst tunnel surrounding rock is obtained. Finally, the method of
correction and classification of karst tunnel surrounding rock is verified by
case studies on the phase 1 project of Guiyang rail transit line 3 and the
newlybuilt 4 karst tunnels along the Zhejiang section
on QuzhouJiujiang Railway.
TONG Jianjun, GUI Dengbin, WANG Mingnian, LI Zhi′an, LYU Zhizhou, ZHAO Daming
. Modifying Methods for Surrounding Rock Grade of Karst
Tunnel[J]. Tunnel Construction, 2021
, 41(S1)
: 99
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.013
