Abstract: It is imperative to understand the spatial and temporal coordination deformation mechanism and develop targeted deformation control technologies for high sidewall–bottom transfixion (HSBT) zones to guarantee the stability of rock surrounding underground hydro-powerhouses under complex geological conditions. In this study, the spatial and temporal coordinated deformation control of HSBT zones was addressed from the aspects of the deformation mechanism, failure characteristics, and control requirements, and some coordinated deformation control technologies were proposed. On this basis, a case study was conducted on the deformation control of the HSBT zone of the underground powerhouse at the Wudongde hydropower station, China. The results showed that the relationship between excavation and support, and the mismatch of deformation and support of the surrounding rock mass in the HSBT zone of underground caverns with a large span and high in-situ stress can be appropriately handled. The solution requires proper excavation and construction procedures, fine blasting control, composite and timely support, and real-time monitoring and dynamic feedback. The technologies proposed in this study will ensure the safe, high-quality, and orderly construction of the Baihetan and Wudongde underground caverns, and can be applied to other similar projects.

大型地下厂房高边墙及下部贯通区变形协调控制研究

[1]BehniaM, SeifabadMC, 2018. Stability analysis and optimization of the support system of an underground powerhouse cavern considering rock mass variability. Environmental Earth Sciences, 77(18):645.

[2]BrochE, 2016. Planning and utilisation of rock caverns and tunnels in Norway. Tunnelling and Underground Space Technology, 55:329-338.

[3]ChenBR, FengXT, HuangSL, et al., 2011. Spatial-temporal feature of stress field evolution for Jinping II marble excavation in high stress zone. Materials Research Innovations, 15(S1):S535-S538.

[4]ChenF, HeC, DengJH, 2015. Concept of high geostress and its qualitative and quantitative definitions. Rock and Soil Mechanics, 36(4):971-980 (in Chinese).

[5]ChenYF, ZhengHK, WangM, et al., 2015. Excavation-induced relaxation effects and hydraulic conductivity variations in the surrounding rocks of a large-scale underground powerhouse cavern system. Tunnelling and Underground Space Technology, 49:253-267.

[6]DadashiE, NoorzadA, ShahriarK, et al., 2017. Hydro-mechanical interaction analysis of reinforced concrete lining in pressure tunnels. Tunnelling and Underground Space Technology, 69:125-132.

[7]DaiF, LiB, XuNW, et al., 2016. Deformation forecasting and stability analysis of large-scale underground powerhouse caverns from microseismic monitoring. International Journal of Rock Mechanics and Mining Sciences, 86:269-281.

[8]DengZY, LiangNH, LiuXR, et al., 2021. Analysis and application of friction calculation model for long-distance rock pipe jacking engineering. Tunnelling and Underground Space Technology, 115:104063.

[9]DengZY, LiuXR, ZhouXH, et al., 2022. Main engineering problems and countermeasures in ultra-long-distance rock pipe jacking project: water pipeline case study in Chongqing. Tunnelling and Underground Space Technology, 123:104420.

[10]DongJY, YangJH, YangGX, et al., 2011. Analysis on causes of deformation and failure of large scale underground powerhouse. Applied Mechanics and Materials, 71-78:644-650.

[11]FanQX, WangYF, 2010. Stability analysis of layered surrounding rock mass of large underground powerhouse of Xiangjiaba hydropower station. Chinese Journal of Rock Mechanics and Engineering, 29(7):1307-1313 (in Chinese).

[12]FanQX, WangYF, 2011. A case study of rock mass engineering of underground powerhouse at Xiluodu hydropower station. Chinese Journal of Rock Mechanics and Engineering, 30(S1):2986-2993 (in Chinese).

[13]FanQX, LiuYY, WangY, 2011. Construction and monitoring study of large underground powerhouse caverns of Xiangjiaba hydropower station. Chinese Journal of Rock Mechanics and Engineering, 30(4):666-676 (in Chinese).

[14]FanQX, ZhouSW, LiBF, 2012a. Key technologies of rock engineering for construction of Xiluodu superhigh arch dam. Chinese Journal of Rock Mechanics and Engineering, 31(10):1998-2015 (in Chinese).

[15]FanQX, LiuYY, YiZ, 2012b. Key technology of tailrace system at Xiangjiaba right-bank underground powerhouse. Chinese Journal of Rock Mechanics and Engineering, 31(12):2377-2388 (in Chinese).

[16]FanQX, LiY, WangHB, et al., 2018. Discussion on ventilation technique during construction of ultra-large underground caverns for Baihetan hydropower station. Water Resources and Hydropower Engineering, 49(9):110-119 (in Chinese).

[17]FanQX, LinP, JiangS, et al., 2020. Review on the rock mechanics and engineering practice for large hydropower stations along the downstream section of the Jinsha river. Journal of Tsinghua University (Science and Technology), 60(7):537-556 (in Chinese).

[18]FanQX, LinP, WeiPC, et al., 2021a. Intelligent construction of hydraulic engineering in high altitude areas: challenges and strategies. Journal of Hydraulic Engineering, 52(12):1404-1417 (in Chinese).

[19]FanQX, WangZL, HeW, et al., 2021b. Technological innovations in construction of underground caverns in basaltic rocks at Baihetan hydropower station on Jinsha river. Scientia Sinica Technologica, 51(9):1088-1106 (inChinese).

[20]FengX, XuD, ChenD, et al., 2015. Discrete Element Analysis of Stability of Surrounding Rock of Upstream Side Wall of 7#~8# Unit Section of Right Bank Main Powerhouse. Report No. IRSM-IRM-WDDDC-15, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China(in Chinese).

[21]GanDQ, YangX, ZhangYP, et al., 2019. Stability analysis of underground multicavities in bench blasting vibration. Mathematical Problems in Engineering, 2019:4014761.

[22]GhorbaniM, SharifzadehM, 2009. Long term stability assessment of Siah Bisheh powerhouse cavern based on displacement back analysis method. Tunnelling and Underground Space Technology, 24(5):574-583.

[23]HanG, ZhouH, ChenJL, et al., 2019. Engineering geological properties of interlayer staggered zones at Baihetan hydropower station. Rock and Soil Mechanics, 40(9):3559-3568 (in Chinese).

[24]HoekE, BrownET, 1980. Underground Excavations in Rock. CRC Press, Boca Raton, USA, p.527.

[25]HoekE, Carranza-TorresC, CorkumB, 2002. Hoek-Brown Failure Criterion–2002 Edition. https://static.rocscience.cloud/assets/verification-and-theory/RSData/Hoek-Brown-Failure-Criterion-2002-Edition.pdf

[26]HoekE, CarterTG, DiederichsMS, 2013. Quantification of the geological strength index chart. Proceedings of the 47th U.S. Rock Mechanics/Geomechanics Symposium, p.1757-1764.

[27]HuZH, XuNW, DaiF, et al., 2018. Stability and deformation mechanism of bedding rock masses at the underground powerhouse of Wudongde hydropower station. Rock and Soil Mechanics, 39(10):3794-3802 (in Chinese).

[28]HuZH, XuNW, LiB, et al., 2020. Stability analysis of the arch crown of a large-scale underground powerhouse during excavation. Rock Mechanics and Rock Engineering, 53(6):2935-2943.

[29]HuangJH, LuoY, ZhangG, et al., 2022. Numerical analysis on rock blasting damage in Xiluodu underground powerhouse using an improved constitutive model. European Journal of Environmental and Civil Engineering, 26(7):3009-3026.

[30]HuangSL, DingXL, ZhangYT, et al., 2020. Field and numerical investigation of high wall stability with thin, steeply dipping strata in an underground powerhouse. International Journal of Geomechanics, 20(6):04020055.

[31]IshidaT, KanagawaT, UchitaY, 2014. Acoustic emission induced by progressive excavation of an underground powerhouse. International Journal of Rock Mechanics and Mining Sciences, 71:362-368.

[32]JiangQ, FengXT, FanYL, et al., 2017. In situ experimental investigation of basalt spalling in a large underground powerhouse cavern. Tunnelling and Underground Space Technology, 68:82-94.

[33]JiangQ, FengXT, LiSJ, et al., 2019. Cracking-restraint design method for large underground caverns with hard rock under high geostress condition and its practical application. Chinese Journal of Rock Mechanics and Engineering, 38(6):1081-1101 (in Chinese).

[34]JiangRC, DaiF, LiuY, et al., 2020. An automatic classification method for microseismic events and blasts during rock excavation of underground caverns. Tunnelling and Underground Space Technology, 101:103425.

[35]JiangX, XuNW, ZhouZ, et al., 2019. Failure mechanism of surrounding rock of bus-bar tunnels at Lianghekou hydropower station subjected to excavation. Rock and Soil Mechanics, 40(1):305-314 (in Chinese).

[36]JinCY, MaZY, ZhangYL, 2009. Prediction of surrounding deformations of underground powerhouse using ANFIS. Journal of Dalian University of Technology, 49(4):576-579 (in Chinese).

[37]JingMG, ZhuL, LiuKP, et al., 2015. Study of blasting excavation of Nanganqu hydraulic tunnel in Xiangjiaba hydropower station. Blasting, 32(3):133-138 (in Chinese).

[38]KumarK, SainiRP, 2022. A review on operation and maintenance of hydropower plants. Sustainable Energy Technologies and Assessments, 49:101704.

[39]KumarV, JhaPC, SinghNP, et al., 2021. Dynamic stability evaluation of underground powerhouse cavern using microseismic monitoring. Geotechnical and Geological Engineering, 39(3):1795-1815.

[40]LiB, DaiF, XuNW, et al., 2013. Establishment and application of microseismic monitoring system to deep-buried underground powerhouse. Advanced Materials Research, 838-841:889-893.

[41]LiHB, YangXG, ZhangXB, et al., 2017. Deformation and failure analyses of large underground caverns during construction of the Houziyan hydropower station, Southwest China. Engineering Failure Analysis, 80:164-185.

[42]LiX, LiYL, ZhangP, et al., 2017. Precision analysis of seepage monitoring optimization mathematical model for dam body of Pubugou hydropower station. Water Resources and Power, 35(12):55-57 (in Chinese).

[43]LiXP, LvJL, LuoY, et al., 2018. Mechanism study on elevation effect of blast wave propagation in high side wall of deep underground powerhouse. Shock and Vibration, 2018:4951948.

[44]LiXP, BianX, LuoY, et al., 2020. Study on attenuation law of blasting vibration propagation of side wall of underground cavern. Rock and Soil Mechanics, 41(6):2063-2069 (in Chinese).

[45]LiY, ZhuWS, FuJW, et al., 2014. A damage rheology model applied to analysis of splitting failure in underground caverns of Jinping I hydropower station. International Journal of Rock Mechanics and Mining Sciences, 71:224-234.

[46]LinP, WangRK, KangSZ, et al., 2011. Key problems of foundation failure, reinforcement and stability for superhigh arch dams. Chinese Journal of Rock Mechanics and Engineering, 30(10):1945-1958 (in Chinese).

[47]LinP, ZhouYN, LiuHY, et al., 2013. Reinforcement design and stability analysis for large-span tailrace bifurcated tunnels with irregular geometry. Tunnelling and Underground Space Technology, 38:189-204.

[48]LinP, LiuHY, ZhouWY, 2015. Experimental study on failure behaviour of deep tunnels under high in-situ stresses. Tunnelling and Underground Space Technology, 46:28-45.

[49]LinP, ShiJ, WeiPC, et al., 2019. Shallow unloading deformation analysis on Baihetan super-high arch dam foundation. Bulletin of Engineering Geology and the Environment, 78(8):5551-5568.

[50]LiuW, 2010. Construction technology of twice tensioning for high-strength prestressed anchor bolt for rock-wall crane beam in underground powerhouse of Pengshui hydropower station. Water Resources and Hydropower Engineering, 41(7):57-59 (in Chinese).

[51]LuJJ, FangD, LiLQ, 2018. Optimal design of supporting for underground powerhouse on left bank of Baihetan hydropower station. Water Resources and Hydropower Engineering, 49(8):128-135 (in Chinese).

[52]LuoDN, LinP, LiQB, et al., 2015. Effect of the impounding process on the overall stability of a high arch dam: a case study of the Xiluodu dam, China. Arabian Journal of Geosciences, 8(11):9023-9041.

[53]LuoST, YangFJ, ZhouH, et al., 2020. Multi-index prediction method for maximum convergence deformation of underground powerhouse side wall based on statistical analysis. Rock and Soil Mechanics, 41(10):3415-3424 (in Chinese).

[54]LvXL, ChiSC, 2018. Strain analysis of the Nuozhadu high rockfill dam during initial impoundment. Mathematical Problems in Engineering, 2018:7291473.

[55]MaK, ZhangJH, ZhouZ, et al., 2020. Comprehensive analysis of the surrounding rock mass stability in the underground caverns of Jinping I hydropower station in Southwest China. Tunnelling and Underground Space Technology, 104:103525.

[56]MenéndezJ, SchmidtF, KonietzkyH, et al., 2019. Stability analysis of the underground infrastructure for pumped storage hydropower plants in closed coal mines. Tunnelling and Underground Space Technology, 94:103117.

[57]MWR (Ministry of Water Resources of the People’s Republic of China), 2014. Design Code for Hydropower House, SL 266-2014. MWR, Beijing, China(in Chinese).

[58]PanthiKK, BrochE, 2022. Underground hydropower plants. Comprehensive Renewable Energy, 6:126-146.

[59]PinheiroM, EmeryX, MirandaT, et al., 2021. Using geotechnical scenarios for underground structure analysis: a case study in a hydroelectric complex in northern Portugal. Tunnelling and Underground Space Technology, 111:103855.

[60]RezaeiM, RajabiM, 2018. Vertical displacement estimation in roof and floor of an underground powerhouse cavern. Engineering Failure Analysis, 90:290-309.

[61]ShenJY, PriestSD, KarakusM, 2012. Determination of Mohr–Coulomb shear strength parameters from generalized Hoek–Brown criterion for slope stability analysis. Rock Mechanics and Rock Engineering, 45(1):123-129.

[62]ShiAC, LiCJ, HongWB, et al., 2022. Comparative analysis of deformation and failure mechanisms of underground powerhouses on the left and right banks of Baihetan hydropower station. Journal of Rock Mechanics and Geotechnical Engineering, 14(3):731-745.

[63]ShiJ, LinP, ZhouYD, et al., 2018. Reinforcement analysis of toe blocks and anchor cables at the Xiluodu super-high arch dam. Rock Mechanics and Rock Engineering, 51(8):2533-2554.

[64]SongSW, FengXM, LiaoCG, et al., 2016. Measures for controlling large deformations of underground caverns under high in-situ stress condition–a case study of Jinping I hydropower station. Journal of Rock Mechanics and Geotechnical Engineering, 8(5):605-618.

[65]SunH, DuWS, LiuC, 2021. Uniaxial compressive strength determination of rocks using X-ray computed tomography and convolutional neural networks. Rock Mechanics and Rock Engineering, 54(8):4225-4237.

[66]SunYP, LiB, DongLL, et al., 2021. Microseismic moment tensor based analysis of rock mass failure mechanism surrounding an underground powerhouse. Geomatics, Natural Hazards and Risk, 12(1):1315-1342.

[67]WangM, LiHB, HanJQ, et al., 2019. Large deformation evolution and failure mechanism analysis of the multi-freeface surrounding rock mass in the Baihetan underground powerhouse. Engineering Failure Analysis, 100:214-226.

[68]WangM, ZhouJW, ShiAC, et al., 2020. Key factors affecting the deformation and failure of surrounding rock masses in large-scale underground powerhouses. Advances in Civil Engineering, 2020:8843466.

[69]WangQ, ShaoL, 2010. Stability analysis of Nuozhadu rock-fill dam based on non-circular slip surface. Water Resources and Power, 28(10):56-58 (in Chinese).

[70]WangZS, LiY, ZhuWS, et al., 2016. Splitting failure in side walls of a large-scale underground cavern group: a numerical modelling and a field study. SpringerPlus, 5(1):1528.

[71]WenLF, LiYL, ChaiJR, 2020. Numerical simulation and performance assessment of seepage control effect on the fractured surrounding rock of the Wunonglong underground powerhouse. International Journal of Geomechanics, 20(12):05020006.

[72]WuAQ, WangJM, ZhouZ, et al., 2016. Engineering rock mechanics practices in the underground powerhouse at Jinping I hydropower station. Journal of Rock Mechanics and Geotechnical Engineering, 8(5):640-650.

[73]WuFQ, HuXH, GongMF, et al., 2010. Unloading deformation during layered excavation for the underground powerhouse of Jinping I hydropower station, Southwest China. Bulletin of Engineering Geology and the Environment, 69(3):343-351.

[74]XiaoPW, LiTB, XuNW, et al., 2019. Microseismic monitoring and deformation early warning of the underground caverns of Lianghekou hydropower station, Southwest China. Arabian Journal of Geosciences, 12(16):496.

[75]XiaoYX, FengXT, FengGL, et al., 2016. Mechanism of evolution of stress–structure controlled collapse of surrounding rock in caverns: a case study from the Baihetan hydropower station in China. Tunnelling and Underground Space Technology, 51:56-67.

[76]ZhangCH, ZhangYL, 2009. Nonlinear dynamic analysis of the Three Gorge project powerhouse excited by pressure fluctuation. Journal of Zhejiang University-SCIENCE A, 10(9):1231-1240.

[77]ZhangJH, WangRK, ZhouZ, et al., 2018. Pre-load factor of the pre-stressed anchor cable in underground powerhouse with high geo-stress. Rock and Soil Mechanics, 39(3):1002-1008 (in Chinese).

[78]ZhangQY, LiF, DuanK, et al., 2021. Experimental investigation on splitting failure of high sidewall cavern under three-dimensional high in-situ stress. Tunnelling and Underground Space Technology, 108:103725.

[79]ZhouYY, XuDP, GuGK, et al., 2019. The failure mechanism and construction practice of large underground caverns in steeply dipping layered rock masses. Engineering Geology, 250:45-64.

[80]ZhuWS, SunAH, WangWT, et al., 2007. Study on prediction of high wall displacement and stability judging method of surrounding rock for large cavern groups. Chinese Journal of Rock Mechanics and Engineering, 26(9):1729-1736 (in Chinese).

[81]ZhuWS, LiXJ, ZhangQB, et al., 2010. 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):1055-1062.