首页|Mechanical response of Q2 loess stratum surrounding a hydraulic tunnel under dry-wet cycles

Mechanical response of Q2 loess stratum surrounding a hydraulic tunnel under dry-wet cycles

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Understanding the mechanical response of Q2 loess subjected to dry-wet cycles(DWCs)is the premise for the rational design of a hydraulic tunnel.Taking the Hanjiang-to-Weihe south line project in China as the research background,the microstructure evolution,strength degradation and compression charac-teristics of Q2 loess under different DWCs were investigated,and the fluid-solid coupling analysis of the hydraulic tunnel was carried out using the FLAC3D software.The amplification effect of tunnel sur-rounding soil pressure(SSP)and its influence on the long-term stability of the tunnel under different DWCs were obtained.The results showed that the pore microstructure parameters of the undisturbed and remolded loess basically tend to be stable after the number of DWCs exceeds 3.The porosity of Q2 loess is increased by 26％.The internal friction angle and cohesion of Q2 loess are decreased by 35％and 31％,respectively.The vertical strain of Q2 loess is increased by 55％after considering the DWCs.After the DWCs stabilized,the SSP ratio is increased between 10％and 25％.With the increase in buried depth of the tunnel,the SSP ratio is increased by 8％-10％.The SSP is reduced from 8％to 16％by the rise in groundwater level.As the number of DWCs increases and the burial depth of the tunnel decreases,the distribution of SSP becomes progressively more non-uniform.Based on the amplification factor and the modified compressive arch theory,the SSP distribution model of loess tunnel was proposed,which can be preliminarily applied to the design of supporting structures considering DWCs.

Q2 loessHydraulic tunnelSurrounding soil pressure(SSP)Dry-wet cycles(DWCs)Amplification effect

Sen Peng、Caihui Zhu、Letian Zhai、Haoding Xu、Yubo Li、Guohua Deng、Miaomiao Ge、Yuan Liu

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Institute of Geotechnical Engineering,Xi'an University of Technology,Xi'an,710048,China

State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an,710048,China

China Railway First Survey and Design Institute Group,Co.,Ltd.,Xi'an,710043,China

Institute of Geotechnical Engineering,Wenzhou University,Wenzhou,325035,China

Shaanxi Institute of Water Resource and Electric Power Investigation and Design,Xian,710001,China

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2024

10.1016/j.jrmge.2024.07.013

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(12)