The Effection of Stress Path on the Rock Relaxation Area of Large-Section Tunnel
Construction of large-section tunnel leads to changing of rock stress and comes about complicated stress-path, which causes continuously redistribution of rock stress with changing of stress path, leads expansion and change of plastic zone and brings relaxation-are avariation between left guide hole and right guide hole. The paper firstly introduced the construction situation of four-lane tunnel, and then analyzed its developments of design and construction at present. Relying on Dragon Head Mountain expressway tunnel with eight-lane and two way in Guangzhou, analyzed and discussed stress path, rock relaxation area effect on large-section tunnel by using site measured data from multi-displacement meter and numerical calculation result of rock relaxation area in different excavations. At the same time, verified the rational range of rock relaxation-area of large-section four- lane tunnel, which made the rock load of large-section tunnel to be studied further.
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
Z. X. Yan et al., "The Effection of Stress Path on the Rock Relaxation Area of Large-Section Tunnel", Advanced Materials Research, Vols. 368-373, pp. 2859-2865, 2012