Abstract
This paper presents new valuable field data and a comprehensive approach to the determination of the rock mass classification and tunnel support systems for tunnels in unconsolidated sedimentary rocks as a special soil condition. The main objective of this study is to investigate and present the characteristics of the unconsolidated sedimentary rock by using the point load tests and slake durability tests. In addition, the appropriate rock mass classification and tunnel support system for the unconsolidated sedimentary rock tunnel are proposed, based on the results of experimental tests. The proposed rock mass classification and tunnel support system are validated through comparison against results from measuring the convergence of a tunnel under the construction. The proposed tunnel support system is appropriate for the unconsolidated sedimentary rocks, since the convergence factors, such as the maximum displacement and velocity of displacement, satisfy the criteria.
Highlights
A number of countries have seriously lacked land space because of the increase of population density and industrialization; a number of constructions such as the tunnel, high-speed railway, housing complex, airport, and harbor are progressing in special soil areas
The appropriate rock mass classification and tunnel support system for the unconsolidated sedimentary rock tunnel are proposed based on the results of experimental tests
The proposed rock mass classification and tunnel support system are validated through comparison against results from measuring the convergence of a tunnel under the construction
Summary
A number of countries have seriously lacked land space because of the increase of population density and industrialization; a number of constructions such as the tunnel, high-speed railway, housing complex, airport, and harbor are progressing in special soil areas. There was a desire to avoid construction of the tunnel in poor soil conditions, the tunnel has been recently constructed in special soil conditions, such as in unconsolidated sedimentary rock. There are no criteria in the rock mass classification for an unconsolidated sedimentary rock in South Korea. There are cases for unconsolidated sedimentary rocks in other countries. It is difficult for these criteria to apply to the classification method, due to local differences; real design cases are not opened, making it hard to obtain the information of rock mass classifications in other countries. This study is focused on investigating characteristics of the unconsolidated sedimentary rocks in South Korea and proposing the design method of a tunnel located in unconsolidated sedimentary rocks
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