An analytical design method for ductile support structures in squeezing tunnels

Wu, Kui; Shao, Zhushan; Qin, Su

doi:10.1007/s43452-020-00096-0

Cited by 76 publications

(43 citation statements)

References 27 publications

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“…High temperature can able to alter the structure of salt rock and lead to the variation in its mechanical properties. erefore, it is of great significance to study the creep properties of salt rock at different temperatures to ensure the long-term safety and stability of USC [46][47][48].…”

Section: Influence Of Temperature On the Creep Properties Of Saltmentioning

confidence: 99%

Creep Properties and Constitutive Model of Salt Rock

Zhang

Song

Wang

et al. 2021

Advances in Civil Engineering

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Due to the advantages of low porosity, low permeability, high ductility, and excellent capacities for creep and damage self-healing, salt rock is internationally considered as the ideal medium for underground storage of energy and disposal of radioactive waste. As one of the most important mechanical properties of salt rock, creep properties are closely related to the long-term operation stability and safety of salt rock underground storage cavern. A comprehensive review on the creep properties and constitutive model of salt rock is put forward in this paper. The opinions and suggestions on the research priority and direction of salt rock's mechanical properties in the future are put forward: (1) permeability variation of salt rock under the coupling effect of temperature and stress; (2) damage mechanism and evolution process under the effect of creep-fatigue interaction and low frequency cyclic loading; (3) microdeformation mechanisms of salt rock and the relationship between microstructure variations and macrocreep behavior during creep process; (4) the establishment of the creep damage constitutive model with simple form, less parameters, easy application, and considering the damage self-healing ability of salt rock simultaneously.

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Section: Influence Of Temperature On the Creep Properties Of Saltmentioning

confidence: 99%

Creep Properties and Constitutive Model of Salt Rock

Zhang

Song

Wang

et al. 2021

Advances in Civil Engineering

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“…During rock cutting by the disc cutter, the normal force is known to be a dominant effect. erefore, many researchers have conducted quasistatic penetration tests and simulations to study the mechanical responses and failure characteristics of disc cutters [11][12][13][14][15][16]. Gong et al [17,18] and Bejari and Khademi Hamidi [19] studied the effects of joint orientation and joint spacing on crack propagation and chip formation by using the UDEC.…”

Section: Introductionmentioning

confidence: 99%

Breakage Mechanism of Layered Sandstone Penetrated by TBM Disc Cutter

Bao

Cheng

Jiang

2021

Shock and Vibration

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In this paper, the breakage mechanism of layered sandstone subjected to the TBM disc cutter was investigated. A series of typical layered sandstone specimens were prepared for true triaxial compression tests in the laboratory to simulate the disc cutter action at the tunnel face, and an acoustic emission (AE) system was used to monitor the breaking process during the penetration tests. Furthermore, a DV recorder was employed to capture the surface deformation. Then, the failure specimens were scanned by high resolution X-ray micro-CT. The results show that the failure mode of layered sandstone in terms of cracking transforms into local crushing with increasing confining stress. The propagation pattern of the cracks varies with the bedding inclination, which is distinctly different from intact rock. The results also indicate that the peak force presents linear variation with the confining stress and an increasing trend with the bedding inclination at the first penetration, and the failure mode of the second penetration is mainly related to the broken status from the first penetration.

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“…The empirical equation can be used to accurately predict the inflow of groundwater into a tunnel and thus the amount of water entering the tunnel. Discrete element numerical simulations [16][17][18][19][20], mechanical tests [21][22][23][24], and model tests [25][26][27][28] have been used to study the surrounding rock deformation laws of jointed rock in underground engineering. As an emerging technology, 3D printing is also used in the research of jointed rock masses.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

Wang

2021

Geofluids

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The coupling of the joint network and groundwater in rock under bias conditions has a significant impact on the deformation and failure of the surrounding rock due to tunnel excavation. This paper studies the deformation and failure of surrounding rock after tunnel excavation under different joint network and groundwater conditions. A finite element-based composite joint network modeling method is proposed in this paper, and the typical parameters of the surrounding rock, such as the plastic zone size, vertical displacement, and lateral displacement, are analyzed and compared through numerical calculations. According to the different stratum and hydraulic conditions considered, four numerical models under four different working conditions are established and studied. The deformation and failure laws of the surrounding rock during tunnel excavation are obtained. The results show that with a single joint network, when there is no influence of groundwater, the surrounding rock mainly undergoes shear failure at the arch crown after tunnel excavation. When the influence of groundwater is considered, there are differences in the mode of damage between the left and right sides of the tunnel. The stratum approximately 1 m from the invert breaks, and the right sidewall fails approximately 1 m from the measuring point. In rock with a composite joint network, when groundwater is not considered, two kinds of failures occur in the surrounding rock near the tunnel; however, the surrounding rock far from the tunnel is dominated by shear failure. The stratum approximately 3.5 m from the arch crown fractures and the surrounding rock within approximately 5.5 m from the measurement point on the right sidewall undergoes separation failure. Under the dual effects of joints and groundwater, soft rock deforms considerably. The total hydraulic gradient decreases from left to right before and after tunnel excavation. The total hydraulic gradient of the composite joint network strata is generally smaller than that of the single joint network. In the composite joint network strata, the total hydraulic gradient near the tunnel changes dramatically. This research can provide a reference for tunnel engineering under similar conditions.

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An analytical design method for ductile support structures in squeezing tunnels

Cited by 76 publications

References 27 publications

Creep Properties and Constitutive Model of Salt Rock

Creep Properties and Constitutive Model of Salt Rock

Breakage Mechanism of Layered Sandstone Penetrated by TBM Disc Cutter

Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

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