Analysis model for the excavation damage zone in surrounding rock mass of circular tunnel

Yang, Haiqing; Huang, Da; Yang, Xiuming; Zhou, Xiaoping

doi:10.1016/j.tust.2012.12.006

Cited by 30 publications

(5 citation statements)

References 14 publications

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“…Factors favorable to the formation and growth of EDZ must be identified and controlled. According to Yang et al [29,30], three main aspects may contribute to the formation of EDZ namely in-situ stress or excavation process, time-dependent behavior of rocks, and rock mass quality or evolution of fractured zones in rock mass. In fact, the EDZ is particularly formed when concentrated compressive or tensile in-situ stress is higher than the rock strength [31,32,33].…”

Section: Excavation Loose Zone and Excavation Disturbed Zonementioning

confidence: 99%

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Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Frenelus

Peng

Zhang

2021

Frattura Ed Integrità Strutturale

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Rocks are frequently host materials for underground structures, particularly for deep Tunnels. Their behavior plays a fundamental role in the overall stability of these structures. In fact, the erection of deep tunnels imposes rocks excavations around the defined routes. These excavations are generally carried out by various methods of which the most used are Drill-and-Blast (DB) and Tunnel Boring Machine (TBM). However, regardless of the tunnelling method used, the impacts such as the perturbation of the initial stress field in rocks and the release of the stored energy are always significant. The impacts produce damage, fractures and deformations which are generally time-dependent and influence the long-term stability of deep tunnels built in rocks. Thus, by considering the aforementioned excavation methods, this paper identifies, reviews and describes the relevant factors generated during and after rock excavations. Interestingly, such factors directly or indirectly influence the long-term stability and therefore the structural integrity of deep rock tunnels. In addition, some recommendations and proposals for future works are presented. This paper can provide useful references in understanding the degradations, damage and fractures generated by tunnelling methods and facilitate suitable actions to ensure long-term stability of deep underground structures.

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Section: Excavation Loose Zone and Excavation Disturbed Zonementioning

confidence: 99%

“…According to Yang et al [29], the elastic stress energy depends on various factors such as principal stresses, number of elements contained in the rocks, and the mechanical properties of rocks. Rocks with more elements can release more strain energy.…”

mentioning

confidence: 99%

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Frenelus

Peng

Zhang

2021

Frattura Ed Integrità Strutturale

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“…Excessive ground settlement can affect the function of the surrounding buildings and pipelines, even cause collapse [2]. In addition, the presence of buildings, vehicles, and other forms of surcharge loading on the ground causes additional stress [3,4] to the supporting structure, thereby increasing the deflection and ground settlement. The shear strength and loading path of soil will also affect the stability of foundation pit [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Inclination Angle on the Response of Double-row Retaining Piles: Experimental and Numerical Investigation

Ye¹,

Wang²,

Huang

et al. 2020

Teh. vjesn.

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The excavation depth of foundation pits has been increasing along with the continuous development of underground space and high-rise buildings. As a result, traditional double-row vertical piles cannot meet the ground settlement and deflection requirements. This study proposed a double-row pile optimization method to extend the suitability of double-row retaining piles to greater excavation depth. The optimization model was established by adjusting the inclination angle of the front and rear piles. Physical scale model tests were performed to analyze the effect of the inclination angle on the pile head displacements and bending moments during excavations and step loadings using three schemes, namely, traditional double-row piles with vertical piles, double-row contiguous retaining piles with batter pile in the front row, and double-row contiguous retaining piles with batter pile in both rows. Numerical simulations were also conducted to verify the effectiveness of the inclination angle adjustment in optimizing the double-row piles. Results indicate that the increase in the displacement and bending moment of the double-row contiguous retaining batter piles is not evident during excavation and step loading when compared with those of the double-row vertical piles and the double-row contiguous retaining piles with batter pile in the front row. Thus, double-row contiguous retaining batter piles can be used in deep foundation pits. The tilt angle is also excessively small to reduce the lateral displacement of the foundation pit, and the optimal tilt angle is 8°-16°. Although the embedment depth can influence the deformation of the double-row contiguous retaining batter piles significantly, a critical embedment depth may be reached. The findings of this study can provide references for the optimization of double-row piles in foundation pits.

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“…Yang [1] proposed an analytical model for the evolution of fractured zone in viscoelastic surrounding rock mass combining the sliding crack model and equivalent crack method, and the displacement after lining was set up is far more than the one at the moment of excavation just finished. Ding [2] summarized the safety risks and risk factors of the metro construction, interpreted the acquisition process of risk identification rules, and the production of rule-extensions and the storage of rule structures.…”

Section: Introductionmentioning

confidence: 99%

Discrete element analysis of the excavation effect of cross-river tunnel on the surroundings

Liu

Zhang

2017

MATEC Web Conf.

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Abstract. Cross-river tunnel as one of the underground constructions is complicated during its construction. For stability of tunnel excavation, it is emergency to analyze the dynamic characteristics of tunnel deformation under high water pressure. Therefore, a cross-river tunnel model is proposed based on DEM in this paper. Stiffness of particles decreases during excavation process which is as one of excavation methods. Porosity ratio of original porosity over its value at different excavation time has been considered. Radial displacements of particles at different angle around the tunnel are detected during excavation process. It shows that large deformation occurs at the vault of the excavation zone which accompanies with large radial displacement. The upper half of the tunnel performs larger deformation than the lower half part which results in many cracks in the concrete lining, the high water pressure may play an crucial role in it.

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Analysis model for the excavation damage zone in surrounding rock mass of circular tunnel

Cited by 30 publications

References 14 publications

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Effect of Inclination Angle on the Response of Double-row Retaining Piles: Experimental and Numerical Investigation

Discrete element analysis of the excavation effect of cross-river tunnel on the surroundings

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