Large deformation evolution and failure mechanism analysis of the multi-freeface surrounding rock mass in the Baihetan underground powerhouse

Wang, Meng; Li, Haibo; Han, Jiqing; Xiao, Xin-hong; Zhou, Jia‐wen

doi:10.1016/j.engfailanal.2019.02.056

Cited by 23 publications

(6 citation statements)

References 13 publications

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“…Applications of viscoelastic models can also be found in the geological field. Considering that rocks exhibit a pronounced time-dependent mechanical behaviour (e.g., the deformation and failure of rocks evolve gradually over time instead of occurring instantaneously), which is supported by evidence from several field studies [182][183][184], the rheology of rocks has become one of the essential topics in geomechanics. Recently, within the framework of irreversible thermodynamics, a finite-strain viscoelastic-damage model was developed by Cheng et al [185] using FEM to investigate the long-term strength and timedependent failure and instability of rocks.…”

Section: Failure and Instability Analysis Of Viscoelastic Rocksmentioning

confidence: 90%

A Review on Modelling of Viscoelastic Contact Problems

et al. 2022

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Approaches to solving viscoelastic problems have received extensive attention in recent decades as viscoelastic materials have been widely applied in various fields. An overview of relevant modelling approaches is provided in the paper. The review starts with a brief introduction of some basic terminologies and theories that are commonly used to describe the contact behaviour of viscoelastic materials. By building up the complexity of contact problems, including dry contact, lubricated contact, thermoviscoelastic contact and non-linear viscoelastic contact, tentative analytical solutions are first introduced as essential milestones. Afterwards, a series of numerical models for the various types of contact problems with and without surface roughness are presented and discussed. Examples, in which computational tools were employed to assist the analysis of viscoelastic components in different fields, are given as case studies to demonstrate that a comprehensive numerical framework is currently being developed to address complex viscoelastic contact problems that are prevalent in real life.

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Section: Failure and Instability Analysis Of Viscoelastic Rocksmentioning

confidence: 90%

A Review on Modelling of Viscoelastic Contact Problems

et al. 2022

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“…In this study, 3DEC was mainly used to help analyze the shear deformation mechanism, and the rock mass was regarded as a discontinuous discrete medium. Wang et al [46] studied the large deformation and failure mechanism analysis of the multi-free-face surrounding rock mass in the Baihetan To reduce the adverse effects of C 2 on the stability of the surrounding rock of the main powerhouse and other caverns, some cracking-restraint design methods for large underground caverns could be applied [15,20,21,47,48]. On the one hand, it was very necessary to construct concrete replacement tunnel in advance.…”

Section: Discussionmentioning

confidence: 99%

Deformation and Failure Analyses of the Surrounding Rock Mass with an Interlayer Shear Zone in the Baihetan Underground Powerhouse

Yuan

Shi

Zhou

et al. 2021

Advances in Civil Engineering

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In the process of underground cavern excavation, the existence of the interlayer shear zones or large faults often makes the surrounding rock tend to be unstable or even deformed. Under the influence of interlayer shear zone C2, different degrees of deformation and failure occurred in many parts during the excavation of the Baihetan left bank underground powerhouse. Based on field monitoring and numerical calculation, this paper studies the deformation and failure characteristics of the rock mass with C2 in the whole excavation process and the failure mechanisms are analyzed. The results show that C2 has poor mechanical properties. In the process of excavation, it mainly induces two failure modes: rock collapse and shear deformation, which specifically leads to rock collapses, large deformation and shotcrete cracking in the main powerhouse, and shear deformation in the omnibus bar caves. In addition, the similarities and differences between this study and other studies on the deformation and failure of surrounding rock of underground powerhouse in recent years are discussed, and the relevant treatment measures for C2 are given. The above research results can be a reference for other related studies.

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“…erefore, because of more intense unloading triggered by excavation disturbance, the surrounding rock mass at the intersection of caverns has a higher deformation rate and greater risk of large deformation, spoiling the stability of the underground powerhouse. e downstream sidewall of the main powerhouse has larger deformation than the upstream side because the intersection has been a prevalent phenomenon, which also occurs in the other underground powerhouses [29]. In addition to the intersection of the main powerhouse and the omnibus bar cave, there are many intersections of caverns in the underground powerhouse, such as the intersection of the main powerhouse and the diversion tunnel, of the tailrace tunnel and the construction adit, or of access tunnels.…”

Section: Intersection Of Cavernsmentioning

confidence: 99%

Key Factors Affecting the Deformation and Failure of Surrounding Rock Masses in Large‐Scale Underground Powerhouses

Wang

Zhou

Shi

et al. 2020

Advances in Civil Engineering

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The stability of the surrounding rock masses of underground powerhouses is always emphasized during the construction period. With the general trends toward large-scale, complex geological conditions and the rapid construction progress of underground powerhouses, deformation and failure issues of the surrounding rock mass can emerge, putting the safety of construction and operation in jeopardy and causing enormous economic loss. To solve these problems, an understanding of the origins and key affecting factors is required. Based on domestic large-scale underground powerhouse cases in the past two decades, key factors affecting the deformation and failure of the surrounding rock mass are summarized in this paper. Among these factors, the two most fundamental factors are the rock mass properties and in situ stress, which impart tremendous impacts on surrounding rock mass stability in a number of cases. Excavation is a prerequisite of surrounding rock mass failure and support that is classified as part of the construction process and plays a pivotal role in preventing and arresting deformation and failure. Additionally, the layout and structure of the powerhouse are consequential. The interrelation and interaction of these factors are discussed at the end of this paper. The results can hopefully advance the understanding of the deformation and failure of surrounding rock masses and provide a reference for design and construction with respect to hydroelectric underground powerhouses.

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Large deformation evolution and failure mechanism analysis of the multi-freeface surrounding rock mass in the Baihetan underground powerhouse

Cited by 23 publications

References 13 publications

A Review on Modelling of Viscoelastic Contact Problems

A Review on Modelling of Viscoelastic Contact Problems

Deformation and Failure Analyses of the Surrounding Rock Mass with an Interlayer Shear Zone in the Baihetan Underground Powerhouse

Key Factors Affecting the Deformation and Failure of Surrounding Rock Masses in Large‐Scale Underground Powerhouses

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