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Seismic Response Analysis of Surrounding Rocks Around Underground Works Adjacent to Bank Slopes
(1 Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010; 2 Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010)
Abstract Because of the motion during an earthquake, terrain such as high mountains and canyons may affect the seismic response characteristics of surrounding rocks around underground works adjacent to bank slopes, and structures on the bank slopes may also have adverse effects on the stability of the surrounding rock due to dynamic loads. On this basis, the main factors affecting surrounding rock stability are analyzed and the key problems regarding the calculation analysis of its seismic response are discussed and compared quantitatively by means of numerical simulation. Then, using the underground caverns of the Wudongde hydropower station as an example, a time-history analysis of the stability of the surrounding rocks is performed, with earthquake inputs determined by the fortification criterion. The factors of cavern excavation, high mountainous and canyon terrain and the dynamic loads of structures on bank slopes are considered in the calculation. The research results show that earthquakes have a little influence on the underground structures because of the sound rock lithology, the stability of the surrounding rock is mainly governed by cavern support, and the dynamic loads of the arch dam foundation base do not have a controlling influence on surrounding rock stability.
Abstract：
Because of the motion during an earthquake, terrain such as high mountains and canyons may affect the seismic response characteristics of surrounding rocks around underground works adjacent to bank slopes, and structures on the bank slopes may also have adverse effects on the stability of the surrounding rock due to dynamic loads. On this basis, the main factors affecting surrounding rock stability are analyzed and the key problems regarding the calculation analysis of its seismic response are discussed and compared quantitatively by means of numerical simulation. Then, using the underground caverns of the Wudongde hydropower station as an example, a time-history analysis of the stability of the surrounding rocks is performed, with earthquake inputs determined by the fortification criterion. The factors of cavern excavation, high mountainous and canyon terrain and the dynamic loads of structures on bank slopes are considered in the calculation. The research results show that earthquakes have a little influence on the underground structures because of the sound rock lithology, the stability of the surrounding rock is mainly governed by cavern support, and the dynamic loads of the arch dam foundation base do not have a controlling influence on surrounding rock stability.
ZHANG Yu-Ting-1,
DING Xiu-Li-1,
ZHOU Shu-Da-2
.Seismic Response Analysis of Surrounding Rocks Around Underground Works Adjacent to Bank Slopes[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(5): 40-47
2015, Vol. 52 