Abstract

In recent, various types of steel pipe-roof methods, which is reinforced by mortar after propulsion of steel pipe into the ground, have been used for the construction of trenchless underpass. Integrated steel pipe-roof has flexural stiffness and can resist against overburden load and reduce the stress acting on the concrete underpass structures. Due to arching effect, vertical and horizontal stress distribution around the steel pipe-roof is changing. In this study, therefore, the characteristic of stress distribution around the underpass induced by the construction of integrated steel pipe-roof is investigated by using numerical method. To examine the soil-structure interaction, interface element is introduced. Results show that vertical stress acting on the concrete structure placing inside the steel pipe-roof is significantly reduced due to arching effect and flexural stiffness of integrated steel pipe-roof. Design load can be reduced and effective design of underpass will be available if the earth pressure reduction due to arching effect is considered in the design stage.

Keywords

• Trenchless construction;
• Integrated steel pipe-roof;
• Flexural stiffness;
• Arching effect

• 비개착공법;
• 일체형 파이프루프;
• 휨강성;
• 아칭효과;

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Acknowledgement

Grant : 파이프루프의 지보강성을 고려한 비개착구조물의 최적설계

Supported by : 한국토지주택공사

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