Lateral damage mechanism of the double-track tunnel in the mountainous layered soft rock and NPR anchor cable control

Sui, Qiru; He, Manchao; Ting-ting, Shi; Pang, Shuiquan; Xiang, Jinyang; Tao, Zhigang; Qu, Dengxing

doi:10.1016/j.undsp.2022.10.011

Cited by 10 publications

(1 citation statement)

References 21 publications

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“…Thus, concrete lining is usually used as a support structure to control the deformation of the surrounding rock and prevent its destruction [2]. At present, numerous scholars have conducted varying degrees of research on the impact of load [3,4], structure [5][6][7][8], and materials [9][10][11] on the overall stability of tunnels within the tunnel support system, yielding abundant results. Sun et al [12] studied the bolt-surrounding rock interaction behavior considering pre-reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Study on Coordinated Deformation Failure Mechanism and Strength Prediction Model of Rock-lining Concrete

Hu,

Sun,

Wei

et al. 2024

Period. Polytech. Civil Eng.

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Shotcrete has been widely used in the excavation of caverns and tunnels as a key load-bearing element in the support system. However, the interfacial stresses and bond strengths within the composite structures formed by the interaction of geologic bodies and tectonic formations are not well understood, which can lead to safety accidents and excessive wastage of support materials in engineering. To address this gap, rock-concrete composite specimens were created using six distinct types of surrounding rocks. The strength law of composite specimens was analyzed, and the uniaxial compressive strength prediction model of composite specimens was derived based on Mohr−Coulomb strength yield criterion. The results show that the uniaxial compressive strength of the composite specimen changes with the change of rock type, which is between the strength of rock and concrete. The uniaxial peak strength and elastic modulus of composite specimens are linearly positively correlated with the ratio (Y) of concrete-rock elastic modulus, which is easily affected by concrete properties. However, the peak strain is linearly and negatively correlated with Y, which is greatly influenced by rock. The rock-concrete interface of the composite specimen plays an important role in the failure of the specimen, which changes the stress transfer state of the composite specimen, produces uncoordinated deformation, and finally causes the failure of the specimen. The theoretical and test value error of the derived composite specimen uniaxial compressive strength prediction model are –1.19%~12.20%, and the theoretical calculation model can be used to predict the uniaxial compressive strength of rock-concrete composite specimens.

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