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21
2025
-
04
Differences in surrounding rock classification between highway tunnels and railway tunnels
Author:
I. Different Transportation Pipelines for Highway Tunnels and Railway Tunnels
Highways and railways are two different transportation pipelines, with certain differences in transportation load and road conditions. Therefore, when designing highway tunnels and railway tunnels, different surrounding rock classification assessments need to be carried out according to the actual situation.
II. Highway Tunnel Surrounding Rock Classification
The assessment of highway tunnel surrounding rock is divided into two levels: support state assessment and surrounding rock stability assessment. Support state assessment is to evaluate the support state of surrounding rock under different surrounding rock levels. Surrounding rock stability assessment mainly evaluates the stability of surrounding rock under different surrounding rock levels. When carrying out highway tunnel surrounding rock classification, the main parameters considered include: surrounding rock hardness and strength, surrounding rock fissures, thickness of surrounding rock and rock strata, ground stress, and compressive and shear strength of surrounding rock, etc.
III. Railway Tunnel Surrounding Rock Classification
Railway tunnel surrounding rock classification is also divided into two levels: preliminary classification and detailed assessment. Preliminary classification can be carried out according to hard rock, medium-hard rock, soft rock, etc. Detailed assessment needs to consider parameters such as surrounding rock undulation, fissures, rock layer dip angle, rock layer bonding, ground stress, surrounding rock strength, and surrounding rock ductility. It is worth noting that factors to be considered in railway tunnel surrounding rock classification also include the speed and load of the railway line.
IV. Differences in Surrounding Rock Classification of the Two Types of Tunnels
The difference between the surrounding rock classification standards for highway tunnels and railway tunnels mainly lies in the setting of assessment quotas and different parameters. Highway tunnels are mainly classified and evaluated based on the hardness and strength of the surrounding rock, while railway tunnels need to consider factors such as the speed and load of the transportation line, and have higher requirements for the stability of the surrounding rock. In addition, in the assessment process, the rock grade of railway tunnel surrounding rock is only a preliminary classification, and further detailed assessment is needed to determine the final classification.
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