title: Splitting failure in side walls of a large-scale underground cavern group: a numerical modelling and a field study.
abstract: Vertical splitting cracks often appear in side walls of large-scale underground caverns during excavations owing to the brittle characteristics of surrounding rock mass, especially under the conditions of high in situ stress and great overburden depth. This phenomenon greatly affects the integral safety and stability of the underground caverns. In this paper, a transverse isotropic constitutive model and a splitting failure criterion are simultaneously proposed and secondly programmed in FLAC3D to numerically simulate the integral stability of the underground caverns during excavations in Dagangshan hydropower station in Sichuan province, China. Meanwhile, an in situ monitoring study on the displacement of the key points of the underground caverns has also been carried out, and the monitoring results are compared with the numerical results. From the comparative analysis, it can be concluded that the depths of splitting relaxation area obtained by numerical simulation are almost consistent with the actual in situ monitoring values, as well as the trend of the displacement curves, which shows that the transverse isotropic constitutive model combining with the splitting failure criterion is appropriate for investigating the splitting failure in side walls of large-scale underground caverns and it will be a helpful guidance of predicting the depths of splitting relaxation area in surrounding rock mass.
authors.affiliation: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061 Shandong Province People's Republic of China.
authors.forename: Zhishen
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061 Shandong Province People's Republic of China ; School of Civil Engineering, Shandong University, Jinan, 250061 Shandong Province People's Republic of China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061 Shandong Province People's Republic of China.
authors.forename: Weishen
authors.initials: W
authors.lastname: Zhu
authors.affiliation: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061 Shandong Province People's Republic of China.
authors.forename: Yiguo
authors.initials: Y
authors.lastname: Xue
authors.affiliation: School of Civil Engineering, Shandong University, Jinan, 250061 Shandong Province People's Republic of China.
authors.forename: Song
authors.initials: S
authors.lastname: Yu
keywords: Field monitoring; High in situ stress; Large-scale underground caverns; Numerical simulation; Splitting failure; Transverse isotropic constitutive model