Seismic response of underground rock cavern dominated by a large geological discontinuity subjected to near-fault and far-field ground motions
CUI Zhen1，2，SHENG Qian1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy
of Sciences，Wuhan，Hubei 430071，China；2. PowerChina Huadong Engineering Corporation Limited，Hangzhou，
Zhejiang 310014，China)
Abstract：Near-fault ground motion mechanisms have seldom been assessed in the seismic studies of underground rock caverns，especially the caverns controlled by large geological discontinuities. A nonlinear joint model was adopted to simulate the unfavorable geological discontinuities. The near-fault pulse-type，near-fault non-pulse-type and far-field ground motion records collected from the NGA-West2 database were used to analyze the influence of near-fault ground motions on unfavorable geological discontinuities. A damage potential index(DPI) was discussed and proposed for unfavorable geological discontinuities. The surge chamber #1 of the Baihetan hydropower plant，which is controlled by the interlayer shear weakness zone(ISWZ) C2，was used as a case study to investigate the differences between the pulse-type near-fault ground motion，non-pulse-type near-fault ground motion and far field ground motion. The significant velocity and displacement and the higher long-period response spectrum were found to associate with the pulse-type near-fault ground motion，while the non-pulse-type near-fault ground motions displayed the similar characteristics as the far field ground motions. The velocity pulse is responsible for the destructive capabilities of near fault ground motions，which may cause the unacceptable sliding along the discontinuity，leading to potential cavern failure. In comparison with several ground motion parameters，PGV was shown to be the most suitable DPI for large geological discontinuities under the earthquake excitation，which was true for both the near-fault and far-field ground motions. PGV was verified to be an effective DPI via the seismic analysis of the Baihetan surge chamber #1. The cavern becomes fragile when subjected to the near-fault ground motions. Therefore，the special seismic reinforcement measures are recommended. These findings may provide a reference for the seismic design of underground caverns.
引用本文:
崔 臻1，2，盛 谦1. 近断层/远场地震动作用下控制性岩体结构对地下洞室地震稳定性影响研究[J]. 岩石力学与工程学报, 2017, 36(1): 53-67.
CUI Zhen1，2，SHENG Qian1. Seismic response of underground rock cavern dominated by a large geological discontinuity subjected to near-fault and far-field ground motions. , 2017, 36(1): 53-67.
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