Stability Analysis of Layered and Jointed Rock Masses at Rigth Bank Underground Powerhouse of Wudongde Hydropower Station

被引：0

作者：

Hu Z. ^{[1
]}

Xu N. ^{[1
]}

Dai F. ^{[1
]}

Gu G. ^{[2
]}

Liu K. ^{[2
]}

Li A. ^{[1
]}

Li B. ^{[1
]}

机构：

[1] State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu

[2] China Three Gorges Co., Beijing

来源：

Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2017年 / 49卷

关键词：

Deformation characteristic; Layered and jointed rock masses; Microseismic monitoring; Surrounding rock damage; UDEC; Underground powerhouse;

D O I：

10.15961/j.jsuese.201600772

中图分类号：

学科分类号：

摘要：

With the developing of hydroelectricity resource, more and more hydropower stations were built in alpine valleys which had complex geographic and geomorphic conditions, and many of them were built in underground with bedded rock. Therefore it has been a critical issue to quantitatively analyze the deformation and stability of underground powerhouse located in bedded rock. The deformation of bedded rock with different dense was analyzed in this case by means of field monitoring and numerical simulation. The results of deformation monitoring, acoustic wave testing and microseismic monitoring were employed to reveal the deformation law and damage zone of surrounding rock. Based on the characteristics of geologic framework and measured data, a calculation model was established to study the stress and deformation field, and plastic zone for the purpose of searching for the potential damage zone of the underground powerhouse during excavation unloading by using the plastic zone had a close connection with that of deformation. The difference of deformation was the result of discrete element analysis procedure UDEC. It was shown by the simulation and microseismic monitoring toghther that when the 6th floor which is between the elevation 815~809 m, the deformation value of elevation 812 m at the upstream side wall increases the fastest, and the amount of maicroseismic events around it increased rapidly. As a whole, the unloading of X axis was more acute than that of Y axis; the defomation value of the upstream side was greater than that of the downstream side. The maximum value of the deformation appears at the elevation of 812 m at the upstream side wall where the value of deepness of the plastic zone is largest. The distribution was more intensive bedding joint at the upstream side than that of the downstream side. The deformation of the surrounding rock has a close connection with the dense of the bedding joint, and the excavation will lead to the activity of bedding joint, leading to the damage of the surrounding rock and reducing the overall strength of the surrounding rock. The severer the excavation is, the faster the quantity of microseismic event increases. The research results will provide useful references for later construction and operation of the underground powerhouse. © 2017, Editorial Department of Advanced Engineering Sciences. All right reserved.

引用

页码：103 / 111

页数：8

共 27 条

[1] Peng Q., Wang D., Deng J., Et al., Analysis of surrounding rock deformation characteristics in underground powerhouse, Chinese Journal of Rock Mechanics and Engineering, 26, 12, pp. 2583-2587, (2007)
[2] Huang Q., Deng J., Su P., Et al., Analysis of surrounding rock displacement character during construction in Pubugou Hydropower Station underground powerhouse chambers, Chinese Journal of Rock Mechanics and Engineering, 30, pp. 3032-3042, (2011)
[3] Yan C., Liu T., Wu F., Deformation and stability analysis of largescale underground cavern group under complicated geological conditions, Journal of Engineering Geology, 16, 1, pp. 84-88, (2008)
[4] Jiang Q., Feng X., Chen G., Et al., Stability study of large underground caverns under high geostress, Chinese Journal of Rock Mechanics and Engineering, 27, pp. 3768-3777, (2008)
[5] Zhao J., Zhu W., Stability Analysis and Modelling of Underground Excavations in Fractured Rocks, (2003)
[6] Zhu W.S., Sui B., Li X.J., Et al., A methodology for studying the high wall displacement of large scale underground cavern complexes and it's applications, Tunnelling and Underground Space Technology, 23, 6, pp. 651-664, (2008)
[7] Zhu W.S., Zhang Q.B., Zhu H.H., Et al., Large-scale geomechanical model testing of an underground cavern group in a true three-dimensional (3-D)stress state, Canadian Geotechnical Journal, 47, 9, pp. 935-946, (2010)
[8] Wang D., Peng Q., Tang R., Et al., Causes analysis of cracking of rock-bolted crane girder in an underground powerhouse, Chinese Journal of Geotechnical Engineering, 26, 10, pp. 2125-2129, (2007)
[9] Wei J., Deng J., Wang D., Et al., Characterization of deformation and fracture for rock mass in underground powerhouse of Jinping I Hydropower Station, Chinese Journal of Rock Mechanics and Engineering, 29, 6, pp. 1198-1205, (2010)
[10] Gao C., Deng J., Wei J., Analysis of surrounding rock displacement characteristics during construction in Guandi underground powerhouse chambers, Chinese Journal of Rock Mechanics and Engineering, 31, pp. 3911-3919, (2012)

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