A multi-scale analysis method for the simulation of tunnel excavation in sandy cobble stratum

Du, Xiuli; Zhang, Pei; Jin, Liu; Lu, Dechun

doi:10.1016/j.tust.2018.09.019

Cited by 27 publications

(6 citation statements)

References 46 publications

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“…Similar with that in Zhang et al (2018) and Du et al (2019), the rocks were simulated as circles and the positions of rocks were determined using the popular "take and place" method (Unger and Eckardt 2011;Du et al 2014;Zhang et al 2018). This method can be detailed into two steps.…”

Section: Meso-structure Of Materialsmentioning

confidence: 99%

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Zhang

2021

Arab J Geosci

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Rock size has a significant impact on the mechanical behavior and deformation performance of soil-rock mixture. This paper aims at investigating and isolating the effect of rock size on the soil-rock mixture in mechanical behavior and deformation behavior and making clear how this factor influences them. Taking the material heterogeneity into account, a two-dimensional meso-scale numerical method for modeling soil-rock mixture is presented, which considers the rocks and soil matrix as separate constituents. Based on the comparison of stress-strain relationships between the numerical simulations and laboratory tests, it is validated that the meso-scale model could describe the macroscopic mechanical behavior of soil-rock mixture well. Then, using the meso-scale method, 160 groups of simulations on soil-rock mixture with different rock sizes under different rock contents are carried out. The shear strength and deformation performance of soil-rock mixture are explored, and their variation laws with rock sizes are discussed subsequently. The simulation results indicate that the soil-rock mixture samples with smaller rocks exhibit a higher peak shear strength, which shows a linear changing trend with rock size. There are no significant changes that took place in the initial elastic modulus under different rock sizes. However, the shear failure modes will present three types as tympany, necking, and cross shear band with the change of rock size. Finally, the influence mechanism of rock size on SRM shear strength and deformation performance is analyzed theoretically.

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Section: Meso-structure Of Materialsmentioning

confidence: 99%

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Zhang

2021

Arab J Geosci

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“…In the EdZ, also called Excavation Influence Zone (EIZ), the hydromechanical and geochemical properties of rocks are not change considerably [35,26]. For circular tunnels, according to Du et al [37], the extent of EdZ depends on the tunnels radius and generally limited to 3 times of their radius (≤3R). It is important to note that, as said by Perras and Diederichs [38], in in-situ measurements, the distinction between EIZ and EDZ is not obvious, and the transition between them is gradual.…”

Section: Excavation Loose Zone and Excavation Disturbed Zonementioning

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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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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“…Zhang et al (2018) considered rock blocks and soil matrix as separate constituents, and presented a mesoscale numerical method for modelling sandy cobble strata. Du et al (2019) presented a multi-scale analysis method for simulating tunnel excavation in sandy cobble strata, and reduced the numerical effort with the precision guaranteed. Khoiri et al (2014) analysed the strength and modulus parameters of the pebble layer by numerical back, and found that the strength parameter tends to decrease linearly.…”

Section: Adjacent Metro Project Sandy Cobble Stratum Computed Tomography Orthogonal Experiments Numerical Calculationmentioning

confidence: 99%

Characteristics of Ground Surface Settlement of Double-Line Adjacent Metro Construction in Sandy Cobble Stratum: A Case Study of Beijing Airport Line

et al. 2021

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A multi-scale analysis method for the simulation of tunnel excavation in sandy cobble stratum

Cited by 27 publications

References 46 publications

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

Evaluation of rock size on the mechanical behavior and deformation performance of soil-rock mixture: a meso-scale numerical and theoretical study

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

Characteristics of Ground Surface Settlement of Double-Line Adjacent Metro Construction in Sandy Cobble Stratum: A Case Study of Beijing Airport Line

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