Modifying Methods for Surrounding Rock Grade of Karst
Tunnel

doi:10.3973/j.issn.2096-4498.2021.S1.013

Tunnel Construction ›› 2021, Vol. 41 ›› Issue (S1): 99-.DOI: 10.3973/j.issn.2096-4498.2021.S1.013

Modifying Methods for Surrounding Rock Grade of Karst Tunnel

TONG Jianjun^{1, 2}, GUI Dengbin^{1, 2, *}, WANG Mingnian^{1, 2}, LI Zhi′an^{1, 2}, LYU Zhizhou^{1, 2}, ZHAO Daming^{1, 2}

(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Online:2021-07-30 Published:2021-08-27

Abstract

Abstract: 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 subgrades 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 subgrade 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 newlybuilt 4 karst tunnels along the Zhejiang section on QuzhouJiujiang Railway.

Key words: karst tunnel, development degree of karst, surrounding rock classification, correction factor

CLC Number:

U 45

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-.

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Modifying Methods for Surrounding Rock Grade of Karst Tunnel

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