Determination of Stiffness of Circumferential Yielding Lining Considering the Shotcrete Hardening Property

Wu, Kui; Shao, Zhushan; Jiang, Yalong; Zhao, Nannan; Qin, Su; Chu, Zhaofei

doi:10.1007/s00603-022-03122-0

Cited by 42 publications

(11 citation statements)

References 41 publications

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“…Additionally, they worked to the short-term safety evaluation of ductile lining based on the Convergence-Confinement method, where the shotcrete hardening property was considered. 34 Whether from analytical approach or numerical method, current researches on the yielding supports are far from sufficient, compared with traditional structures. After reviewing, it can be found that researchers used to pay more attention to the theoretical analysis of deformation and bearing-capacity characteristics of yielding supports, but rarely focused on their interaction with surrounding rock.…”

Section: F I G U R Ementioning

confidence: 99%

“…studied the deformation characteristics of ductile lining using a theoretical method and presented a method to calculate its stiffness. Additionally, they worked to the short‐term safety evaluation of ductile lining based on the Convergence‐Confinement method, where the shotcrete hardening property was considered 34 . Whether from analytical approach or numerical method, current researches on the yielding supports are far from sufficient, compared with traditional structures.…”

Section: Introductionmentioning

confidence: 99%

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Study on the time‐dependent interaction between surrounding rock and yielding supports in deep soft rock tunnels

Wu,

Song,

Zhao

et al. 2023

Num Anal Meth Geomechanics

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As yielding supports can deform without being damaged, the yielding principle has attracted significant attention for tunnelling in squeezing ground compared with the heavy support method. The deformation energy of surrounding rock can be managed using yielding supports that maintain the rock pressure within the bearing capacity of the supports. However, although the yielding principle has been often applied in practical scenarios, a design method for yielding supports has yet not been well developed. This study discusses interaction between the squeezing ground and yielding supports and investigates the influence of the time‐dependent behaviour of rock on the yielding supports. The yielding supports can be implemented by the movement of sliding joints of steel arches or by shortening the yielding elements inserted in shotcrete linings. The deforming process of yielding supports can be divided into three stages: elastic a, yielding, and elastic b. A three‐stage pressure‐displacement relationship of yielding supports is proposed and a method is provided for the calculation of the support stiffnesses of yielding supports in different stages. Furthermore, a unified design approach for the yielding supports is presented and the theoretical model is established after simplifying the asymmetry of problem. The analytical solution for tunnel displacement and support pressure in a tunnel supported by the yielding supports is obtained. The proposed design method for the yielding supports is successfully applied to the Saint Martin La Porte access tunnel, and the mean tunnel deformation in this tunnel is appropriately predicted by the analytical solution. Additionally, a parametric investigation is performed based on the analytical solution, and the effects of yielding path, yielding displacement, support thickness, and installation time of the yielding supports are discussed. Finally, certain highlights of the analytical model of yielding supports in this study are identified, compared with other researches, and recommendations for the design of the yielding supports are provided. The outcome of this research has potential applications in the preliminary design of deep tunnels in squeezing ground.

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Section: F I G U R Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the time‐dependent interaction between surrounding rock and yielding supports in deep soft rock tunnels

Wu,

Song,

Zhao

et al. 2023

Num Anal Meth Geomechanics

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“…External environmental conditions include temperature and groundwater [28]. The decrease in temperature in the tunnel causes the freezing of water, and the volume expansion damages the tunnel structure further, driving other forms of freezing damage [29].…”

Section: Secondary Indexmentioning

confidence: 99%

“…After a tunnel is constructed, the original temperature equilibrium is broken. The temperature balance is reached by the heat exchange between the surrounding rock, the external environment, and the air [28,38]. The location of tunnel freezing damage is related to the length of the tunnel, but it is mainly distributed at the entrance, which is mainly due to the uneven temperature distribution in the tunnel [39,40].…”

Section: Tertiary Indexmentioning

confidence: 99%

Freezing Damage to Tunnels in Cold Regions and Weights of Influencing Factors

Shen

Dong

et al. 2022

Sustainability

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Concrete materials are widely used in tunnel engineering. In China, the cold regions have gradually become the main area for highway and railway construction. Affected by high altitude, low temperature, turbulent wind, and other conditions, freezing damage, such as tunnel icing, occurs in concrete materials, which seriously affects the quality and operational safety of tunnels in cold regions. Therefore, it is necessary to carry out a quantitative analysis of various factors affecting freezing damage to protect concrete materials in tunnels. This paper summarizes various freezing damage phenomena in tunnels in cold regions and divides them into three types: water seepage and hanging ice type freezing damage, lining interface type freezing damage, and tunnel foundation ice accumulation type freezing damage. Based on the qualitative evaluation of each factor, the affiliation of each factor was divided. Then, the influence weight of each factor on freezing damage was obtained through the analytic hierarchy process, and then each factor was ranked. This study is helpful to the selection of anti-freezing measures for tunnels in cold regions.

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“…Fatigue load is an important cause of rock mass instability rupture and frequent disasters 8,[11][12][13][14] . Eberhardt et al 15 studied the mechanical properties of fracture damage in brittle sandstone, and analyzed the extension conditions and fracture criteria of microcracks.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fatigue Mechanical Properties and Acoustic Emission Behavior of Hard Layer Sandstone under Cyclic Disturbance

Cheng,

Song,

et al. 2023

Preprint

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The fatigue deformation of sedimentary rock at tunnel bottom under the train disturbance load contains the mechanical damage behavior. The fatigue mechanics test and acoustic emission (AE) monitoring are carried out to investigate the fatigue deformation and AE response characteristics of layer sandstone under fatigue load. This study showed that there is a time-sensitive correspondence between hysteresis loop and layer degradation effect. The hysteresis loop undergoes intensive distribution, strain transition, sparse distribution and fracture instability, and the continuous stress drops induces a significant strain transition. The layer structure has a significant deterioration effect on bearing strength and fatigue life. The cycle peak strength is degraded by 15.05%-28.19% compared with static peak strength. The fatigue life is positively correlated with peak strength and fatigue life decreases first and then increases with the layer angle increasing. The fracture modes of layer sandstone has anisotropic properties, including tensile fracture I, tensile fracture Ⅱ, shear fracture and composite fracture, and the fractal dimension is negatively correlated with layer degradation effect. AE amplitudes at low-medium-high stress levels are distributed in banded shape, tower shape and semi-tower shape, showing a time-corresponding relationship with the stress paths. There is a competitive relationship between compaction strengthening and fracturing damage. The evolution stages of AE damage variable include damage calm phase, damage acceleration phase and damage burst phase, and 0.20 is the starting point of damage acceleration and mutation damage (DAE−C) near the peak stress indicates a complete fracture. The stronger the layer deterioration effect, the smaller the DAE−C. The result may be represents a useful complement to mechanical properties of sedimentary rocks and is of important for ensuring the rock engineering safety.

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Determination of Stiffness of Circumferential Yielding Lining Considering the Shotcrete Hardening Property

Cited by 42 publications

References 41 publications

Study on the time‐dependent interaction between surrounding rock and yielding supports in deep soft rock tunnels

Study on the time‐dependent interaction between surrounding rock and yielding supports in deep soft rock tunnels

Freezing Damage to Tunnels in Cold Regions and Weights of Influencing Factors

Experimental Study on Fatigue Mechanical Properties and Acoustic Emission Behavior of Hard Layer Sandstone under Cyclic Disturbance

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