Time-dependent deformation characteristics and reinforcement effect of anchored rock mass in deep underground pumping stations

被引：0
|
作者：
Wang K. [1 ]
Jin Z. [1 ]
Ma C. [2 ]
机构：
[1] School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310023, Zhejiang
[2] The Third Engineering Co., Ltd., China Railway Seventh Group, Xi'an, 710043, Shaanxi
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Fault; Loss of anchorage force; Prestressed anchor cable; Pump station cavern; Rock mechanics; Time-dependent characteristics;
D O I：
10.13722/j.cnki.jrme.2019.0312
中图分类号：
学科分类号：
摘要：
The support system of prestressed anchor cables can effectively reduce the expansion of the plastic zone of the surrounding rock in underground cavers. Based on in-situ monitoring and numerical analysis for the high-wall and long-span underground caverns, the deformation evolution process of the surrounding rock and the time-dependent characteristics of the anchor cable tension are analyzed. Three types of change modes of the anchor cable tension, including monotonically increasing, decreasing firstly and then increasing, and monotonically decreasing respectively at the top arch, arch waist and side wall of the underground cavern, are proposed. The deformation characteristics of the anchored rock during the excavation process are analyzed by using the finite difference software FLAC3D, and the variation mode of the anchor cable tension and the supporting effect are discussed. The results show that the anchor cable tension presents remarkable time- dependent characteristics and is closely related to its spatial position;The thru-anchor cable in the middle partition wall effectively reduces the distribution range of the plastic zone of the rock wall. The research conclusion has important theoretical value and guiding significance for the design and construction of similar projects. © 2019, Science Press. All right reserved.
引用
收藏
页码：2263 / 2271
页数：8
相关论文
共 25 条
  • [1] Dai F., Li B., Xu N.W., Et al., Deformation forecasting and stability analysis of large-scale underground powerhouse caverns from microseismic monitoring, International Journal of Rock Mechanics and Mining Sciences, 86, pp. 269-281, (2016)
  • [2] Zhu Z., Sheng Q., Zhang Y., Et al., Research on excavation damage zone of underground powerhouse of Dagangshan hydropower station, Chinese Journal of Rock Mechanics and Engineering, 32, 4, pp. 734-739, (2013)
  • [3] Luo Y., Lu W., Zhou C., Et al., Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress, Rock and Soil Mechanics, 32, 5, pp. 1553-1560, (2011)
  • [4] Li J., Deng H., Huang J., Et al., Analysis of factors affected on prestress losses of unloading rock mass, Rock and Soil Mechanics, 26, pp. 292-295, (2005)
  • [5] Liu X.M., Wang J.Q., Huang J., Et al., Full-scale pullout tests and analyses of ground anchors in rocks under ultimate load conditions, Engineering Geology, 228, pp. 1-10, (2017)
  • [6] Jiang S.H., Li D.Q., Zhang L.M., Et al., Time-dependent system reliability of anchored rock slopes considering rock bolt corrosion effect, Engineering Geology, 175, pp. 1-8, (2014)
  • [7] Sun H.Y., Wong L.N.Y., Shang Y.Q., Et al., Systematic monitoring of the performance of anchor systems in fractured rock masses, International Journal of Rock Mechanics and Mining Sciences, 47, 6, pp. 1038-1045, (2010)
  • [8] 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)
  • [9] Zhu W.S., Li X.J., Zhang Q.B., Et al., A study on sidewall displacement prediction and stability evaluations for large underground power station caverns, International Journal of Rock Mechanics and Mining Sciences, 47, 7, pp. 1055-1062, (2010)
  • [10] Rezaei M., Rajabi M., Vertical displacement estimation in roof and floor of an underground powerhouse cavern, Engineering Failure Analysis, 90, pp. 290-309, (2018)
123