Experimental study of factors affecting fault slip rockbursts in deeply buried hard rock tunnels

Meng, Fanzhen; Zhou, Hui; Wang, Zaiquan; Zhang, Liming; Kong, Liang; Li, Shaojun; Zhang, Chuanqing; Hu, Shengmin

doi:10.1007/s10064-016-0926-y

Cited by 57 publications

(19 citation statements)

References 27 publications

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“…As one of the most important weak zones in rock mass, fault zone is a basic condition that controls engineering safety in mountain areas [1][2][3]. Studies on fault gouges' shear properties are helpful in explaining and predicting disaster risk in fault crossing areas [4].…”

Section: Introductionmentioning

confidence: 99%

Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge

Bao

Lan

et al. 2019

Advances in Civil Engineering

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Fault gouge has special mechanical properties and remarkable engineering effects. Using a ring shear test, the strength properties of the differently colored remolded fault gouges of the Shendaogou Fault in Yan’an were studied by changing moisture contents and normal stresses. Chlorite and illite are the main clay minerals in fault gouges; differences in mineral composition make fault gouges appear in different colors. Besides clay minerals, the dried fault gouges disintegration in water is also due to the transformation of gypsum. The gradation of green fault gouge and multicolor fault gouge is better than that of the red fault gouge, while the fault gouges’ strain softening properties become weaker as the coarse grain content increases. Affected by water content and normal stress, the shear planes can be divided into three failure modes: peeling failure, grooved failure, and sliding failure. With the increase of water content, there will be a significant weakening on cohesion and friction angle. A new parameter, the “Normal Stress Threshold (NST),” is introduced as a critical value for the emergence of the strain hardening phenomenon, and the NSTs of different fault gouges are significantly different. The functions obtained from the relation of residual strength, peak strength, and normal stress can be used to calculate shear strength parameters under any normal stresses. In addition, the residual strength of fault gouge is obviously different from clay and loess, which can be qualitatively explained by clay particle contents.

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Section: Introductionmentioning

confidence: 99%

Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge

Bao

Lan

et al. 2019

Advances in Civil Engineering

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“…With the construction and implementation of large-scale hydropower projects related to rock mass in China, a large number of engineering geological problems, such as the excavation of abutment slope, the excavation and support of underground cavern, and geological structural movement, have arisen, which seriously threaten the safety of the project and people's lives and property [1][2][3]. In particular, the excavation in this rock engineering is a process of unloading and stress redistribution in one or more directions of natural rock mass [4], so the mechanical characteristics of rock mass under loading and unloading conditions are essentially different, especially under soft rock conditions [5].…”

Section: Introductionmentioning

confidence: 99%

“…e fitted formulas of cumulative energy dissipation coefficient and axial strain 2. is the correlation coefficient between the CCDE and the axial strain.…”

mentioning

confidence: 99%

Mechanical Characteristics and Energy Evolution Laws for Red Bed Rock of Badong Formation under Different Stress Paths

Wen

Tang

Wang

et al. 2019

Advances in Civil Engineering

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Exploring mechanical properties of red bed rock of Badong Formation Section two (b2) from the Three Gorges Reservoir is crucial to determine the instability mode of reservoir slopes. In order to reveal the energy evolution laws for b2 rocks under different stress paths, loading tests, unloading tests, and cyclic loading-unloading tests were conducted, respectively. The results show that stress paths have significant influences on the mechanical properties and energy evolution characteristics of b2 rocks and the failure mechanism under three stress paths is revealed. Relative to the loading tests, the mechanical parameters of b2 rocks are deteriorated under the unloading conditions. In addition, the increasing trend of cumulative dissipation energy (CDE) is similar with that of total absorption energy (TAE) and the ESE-strain curves are characterized by multistep rise. For cyclic loading-unloading tests, the areas of hysteretic loop gradually increase as the cycle times increase, and the TAEs and the coefficient of the cumulative dissipation energy (CCDE) also increase gradually with approximately linear characteristics, while the CDEs gradually increase in an abrupt rate. This work can contribute to provide the failure mechanism of b2 rocks for evaluating the stability of reservoir slopes from the energy perspective.

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“…Holub and Petros [20] discussed the thick and integrity strata were contributed to mining-induced seismicity, which was one of the characteristics of rockburst. Lu et al and Meng et al [21,22] indicated geological structures, such as faults and joints, brought about stress increase sharply, which easily lead to rockbursts. Yang et al [4] presented high in situ stresses were the main factor that caused strain energy accumulation and gave rise to rockbursts in the strong rock.…”

Section: Introductionmentioning

confidence: 99%

Rockburst Characteristics and Mechanisms during Steeply Inclined Thin Veins Mining: A Case Study in Zhazixi Antimony Mine, China

Liu

et al. 2018

Shock and Vibration

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With the increase of mining depth, rockbursts have become important safety problems in Zhazixi Antimony Mine, where overlying strata exceed 560 m. Due to the small spacing between the steeply inclined veins, mining activities have great influences on rockbursts of adjacent veins. In order to study rockburst characteristics and mechanisms in Zhazixi Antimony Mine, in situ measurement, field geological survey, uniaxial compression tests, and numerical simulation are conducted to analyze rockburst proneness and simulate the elastic strain energy accumulation characteristics. Consequently, rockburst proneness criteria are established on the basis of experimental results to propose the necessary lithologic conditions for rockburst aiming to Zhazixi Antimony Mine. Rockburst dangerous districts are defined based on high stress concentration and elastic strain energy distribution characteristics in mining process obtained by theory analysis and numerical simulation. Accordingly, it is suggested that thrown-type rockbursts mainly occur in massive stibnite of ventilation shafts and stopes where the elastic strain energy exceeds 300 kJ·m−3, spalling-type rockbursts generally appear in slate of roadways where the elastic strain energy exceeds 100 kJ·m−3, and ejection-type rockbursts arise in different rock masses under a certain condition. Last but not the least, prediction results are basically consistent with statistics data of rockburst events after comparative analysis.

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Experimental study of factors affecting fault slip rockbursts in deeply buried hard rock tunnels

Cited by 57 publications

References 27 publications

Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge

Shear Mechanical Behaviours and Multistrength Parameter Characteristics of Fault Gouge

Mechanical Characteristics and Energy Evolution Laws for Red Bed Rock of Badong Formation under Different Stress Paths

Rockburst Characteristics and Mechanisms during Steeply Inclined Thin Veins Mining: A Case Study in Zhazixi Antimony Mine, China

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