Physical modeling of deformation failure mechanism of surrounding rocks for the deep-buried tunnel in soft rock strata during the excavation. (April 2018)

• Record Type: Journal Article
• Authors: Sun, Xiaoming; Chen, Feng; Miao, Chengyu; Song, Peng; Li, Gan; Zhao, Chengwei; Xia, Xing
• Is Part Of: Tunnelling and underground space technology. Volume 74(2018)
• Page Start: 247
• Page End: 261
• Publication Date: 2018-04
• Subjects: Deep roadway -- Physical model experiment -- Infrared thermal -- Deformation mechanism; Tunneling -- Periodicals; Underground construction -- Periodicals; Tunnels -- Periodicals; Underground areas -- Periodicals; 624.193
• DOI: 10.1016/j.tust.2018.01.022
• Languages: English
• ISSNs: 0886-7798

Abstract

Highlights: Bedding plane produced an inevitable effect on the displacement of surrouding rock. Temperature variations of surrounding rock can reflect the behavior change of surrounding rock. The transfer path of stress during the excavation was achieved. Driving footage influenced the displacement of tunnel during the excavation processes. Abstract: A physical modeling experiment was carried out to study deformation mechanism of tunnel excavated in the deep-buried soft rock strata. During the process of excavation, an infrared camera and a full-field strain measurement system were employed to obtain the thermal response and deformation of surrounding rock. Meanwhile, strain rosettes were used to measuring the strain of surrounding rocks, which were installed with a circular layout pattern in the surrounding rocks. Deformation failure mechanism of surrounding rocks was investigated by synthetic analysis of the infrared images, experimental pictures, and displacement field images. A numerical model was implemented to compare the displacement results of the physical model. The results showed that driving footage produced an effect on the deformation of surrounding rock, the bedding plane had an inevitable influence on the deformation of surrounding rock during the excavation processes and temperature variations of surrounding rock can reflect the behavior change of surrounding rock.