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Research and Application of a Construction Scheme for a Bored Metro Tunnel Intersection in Shallow Fractured Surrounding Rock Based on the "Structure Priority" Principle
(1 College of Civil and Architecture Engineering, Shandong University of Science and Technology, Qingdao 266590;
2 No.1 Engineering Company of China Railway 17Bureau Group Co. Ltd., Taiyuan 030032)
Abstract Considering that the shallow-bored Zhongshan Park Station on Qingdao Metro line 3, which is located in a downtown area, is characterized by difficult construction, a tight schedule and a high safety level, and aiming at some specific problems—such as large traffic flow on the ground, fractured surrounding rock, shallow overburden, complex section shape of the intersection between the station and air duct, a large free face on both sides and high possibility of stress concentration at the corner point—this paper studies the stress and deformation of the surrounding rock under different working conditions with numerical simulation and field monitoring. A construction scheme is proposed for the bored metro tunnel intersection in the shallow fractured rock based on the “structure priority” principle. The results show that adopting this new scheme, featuring the construction of a ring beam and middle secondary lining for the intersection first and then forming a stable frame structure, can weaken the span effect of large-section construction, control the settlement of the fractured rock, improve the construction speed and ensure the stability of the intersection, which is suitable for the construction of a large-section tunnel intersection in a shallow fractured rock mass.
Abstract：
Considering that the shallow-bored Zhongshan Park Station on Qingdao Metro line 3, which is located in a downtown area, is characterized by difficult construction, a tight schedule and a high safety level, and aiming at some specific problems—such as large traffic flow on the ground, fractured surrounding rock, shallow overburden, complex section shape of the intersection between the station and air duct, a large free face on both sides and high possibility of stress concentration at the corner point—this paper studies the stress and deformation of the surrounding rock under different working conditions with numerical simulation and field monitoring. A construction scheme is proposed for the bored metro tunnel intersection in the shallow fractured rock based on the “structure priority” principle. The results show that adopting this new scheme, featuring the construction of a ring beam and middle secondary lining for the intersection first and then forming a stable frame structure, can weaken the span effect of large-section construction, control the settlement of the fractured rock, improve the construction speed and ensure the stability of the intersection, which is suitable for the construction of a large-section tunnel intersection in a shallow fractured rock mass.
.Research and Application of a Construction Scheme for a Bored Metro Tunnel Intersection in Shallow Fractured Surrounding Rock Based on the "Structure Priority" Principle[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(2): 182-189
2016, Vol. 53 