Numerical simulation on excavation-induced damage of rock under quasi-static unloading and dynamic disturbance

Niu, Leilei; Zhu, Wancheng; Cheng, Zhen‐Qiang; Guan, Kai; Qin, Tao

doi:10.1007/s12665-017-6955-4

Cited by 19 publications

(6 citation statements)

References 47 publications

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“…unnel excavation is regarded as an unloading process that can cause degradation of the main properties of surrounding rocks. More broadly, Qiu et al [20] and Niu et al [21] have reported that the surrounding rocks endure a complex unloading-loading process during deep tunnelling. This process affects the main properties of rocks, and generates instability around tunnels.…”

Section: Degradation Of Properties Of Surrounding Rocksmentioning

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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Section: Degradation Of Properties Of Surrounding Rocksmentioning

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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“…During tunnels excavations, the surrounding rocks endure a complex unloading-loading process. 28,29 Thus there is redistribution of the existing stress field. Then, two main zones are formed namely the Excavation Damaged Zone (EDZ), and the Excavation Disturbed Zone (EdZ).…”

Section: Groundwater Inflows Triggering and Mechanisms Into Rocks Tunnelsmentioning

confidence: 99%

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Frenelus¹,

Peng²,

Zhang³

2021

IJH

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Groundwater inflow into tunnels is always a salient topic in Hydrology, Hydraulic Engineering, Hydrogeology, Rock Engineering and allied sciences. In fact, tunnels particularly built below the groundwater table, often face groundwater inflows during their excavation, and even sometimes after they are put into operation. These inflows, habitually regarded as unpredictable geological hazards, cause instabilities in the surrounding rocks of tunnels, and lead to considerable damages such as injuries, loss of lives, and huge-scaled economic expenses. It is argued that groundwater conditions are of decisive significance for the design and running of tunnels. Therefore, accurate prediction or evaluation of groundwater inflows into tunnels is of paramount importance. Such prediction, although it is still challenging, has been broached by many researchers with diverse methods. However, a state-of-the-art review of these methods has not yet been presented. This paper reviews the assessment methods of groundwater inflows into tunnels built in rocky media. The results mainly include analytical, semi-analytical, empirical, semi-empirical, numerical, machine learning, and other methods used in the field. This was made possible by selecting and analysing relevant scientific articles published by various worldwide Journals. In addition, some recommendations and future trends are pointed out. This paper can provide useful references in understanding groundwater inflows prediction in different points of view and their limits in terms of applicability and accuracy.

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“…Xiao et al [32] illustrated that more energy release caused by large-scale integral excavation could aggravate the possibility of rock- For the stress transient unloading effect, numerous research results show that the redistribution of surrounding rock stress caused by stress dynamic unloading has an important influence on the formation and development of the excavation-disturbed area [20][21][22]. Niu et al [23] proposed that the damage zone is influenced by both the magnitude of in situ stress and waveform of the dynamic disturbance. It will be larger with the increase of in situ stress degree [24].…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Excavation Procedure Design of Underground Powerhouses under High In Situ Stress in China

et al. 2021

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To recommend the excavation procedures and design parameters for underground powerhouses, excavation procedures of fifty-one underground powerhouses in China were summarized and analyzed based on in situ stress conditions. Firstly, the complex stress environment in China was introduced and fifty-one underground powerhouses with their engineering scale, size, lithology, rock classification and in situ stress level were listed in detail. Subsequently, to evaluate the influence of in situ stress levels on excavation procedure design, the correlation between excavation procedures and in situ stress level in three main excavation zones were analyzed accordingly. Moreover, to provide the excavation design recommendations, the strength–stress ratio (SSR) was promoted to analyze and recommend the design parameters, and the blasting excavation design based on the stress transient unloading control was also supplemented. The results show that excavation procedures have different priorities under different in situ stress levels, and the design parameters show an obvious relationship with in situ stress levels. Moreover, the excavation procedure parameters are suggested to adjust accordingly under different SSR. The discussion of influencing factors and specification ensures its rationality and accuracy. It is believed that the summary and recommendations can provide a good reference for excavation procedure optimization of underground powerhouse under high in situ stress.

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Numerical simulation on excavation-induced damage of rock under quasi-static unloading and dynamic disturbance

Cited by 19 publications

References 47 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

Evaluation methods for groundwater inflows into rock tunnels: a state-of-the-art review

Optimization Analysis of Excavation Procedure Design of Underground Powerhouses under High In Situ Stress in China

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