Indirect method for the quantitative identification of unstable rock

Du, Yan; Xie, Mowen

doi:10.1007/s11069-021-05197-4

Cited by 10 publications

(4 citation statements)

References 30 publications

(26 reference statements)

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“…Fractured rock masses can induce sliding deformation and damage to, for example, mine slopes, resulting in frequent engineering accidents and causing loss of life and property. Du Yan et al (Du et al, 2021;Du and Xie, 2022) reviewed the research on the genesis mechanism and early warning of rock collapse disasters, and proposed a cohesive safety factor (CSF) and a relatively objective analysis method, which can effectively identify unstable rocks. It provides a relatively complete quantitative evaluation index and evaluation standard for rock collapse early warning and prevention.…”

Section: Crack Angle ( °)mentioning

confidence: 99%

Numerical simulation of creep fracture evolution in fractured rock masses

et al. 2022

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The initiation, expansion, and penetration of microscopic cracks in rock is the macroscopic manifestation of creep. This paper investigates mechanical creep characteristics and fracture evolution processes in rock masses with different fracture angles, lengths, and rock bridge dip angles. Single fractures, dual parallel fractures, and fracture groups are considered. The approach comprises discrete element simulation based on continuum mechanics, utilizing the continuous and discontinuous software, GDEM. Single-fracture rock masses are characterized by a progressive fracture development mode dominated by tensile shear failure. The rate of creep and fracture magnitude both increase according to fracture length. With increasing fracture inclination angle, creep rate and fracture magnitude increase and decrease. The creep rate and degree of rupture are highest for fractures inclined at 30°. The dual-fracture rock mass exhibits both tensile crack failure and compressional shear failure. Creep rates are highest, and rupture effects are most apparent at rock bridge inclination angles of 90°. If the rock bridge is too long or too short, the stable creep stage is prolonged, but the creep acceleration stage intensifies due to interaction between fracture-bounded rock masses. The failure mode, in this case, involves collective failure by tension fractures and compressional shear. Creep rate and fracture magnitude increase with the number of fractures, which accelerates rock mass deformation to a certain extent. However, when the number of fractures reaches a certain threshold, a relatively stable structure may become established, slowing down the creep rate, especially during the creep acceleration stage. This study can provide a theoretical basis and reference for investigating the creep rupture law of rock mass engineering and the prevention and control of fractured rock mass geological disasters.

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Section: Crack Angle ( °)mentioning

confidence: 99%

Numerical simulation of creep fracture evolution in fractured rock masses

et al. 2022

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“…The collapse of dangerous rock masses is a common geological disaster in the western mountainous area of China, which threatens the environment and causes the loss of human lives and property, and also has adverse effects on engineering construction [1,2]. China is a country that experiences severe earthquake disasters, and earthquakes became a major cause of dangerous rock mass collapse in the western region [3,4].…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Stability and Spectral Characteristics of a Toppling Dangerous Rock Mass under Seismic Excitation

Wang,

Zhang,

Huang

et al. 2023

Sustainability

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To evaluate the dynamic stability of dangerous rock masses under seismic excitation more reasonably, a mass viscoelasticity model was adopted to simulate the two main controlling surfaces of a toppling dangerous rock mass. Based on the principles of structural dynamics, a dynamic response analysis model and motion equations were established for toppling dangerous rock masses. The Newmark-β method was utilized to establish a calculation method for the dynamic stability coefficient of a toppling dangerous rock mass. This method was applied to the WY2 dangerous rock mass developed in a steep cliff zone in Luoyi Village, and the dynamic stability coefficient time history was calculated. Subsequently, the acceleration response signals of the dangerous rock mass in different directions were analyzed using wavelet packet transform. The results show that the sum of the energy proportions of the first to third frequency bands in the n1 and s2 directions exceeded 95%. This suggests that the n1 and s2 directions of the WY2 dangerous rock mass suffered the initial damage under bidirectional seismic actions. Finally, the marginal spectra variations of the acceleration response signals in different directions were analyzed based on the HHT. The results show that the seismic energy in the n1 and s2 directions of the dangerous rock mass was found to be the most significant under seismic loading, indicating that the rock mass experienced the most severe damage along these two directions. This reveals that the failure mode of the dangerous rock mass is inclined toppling, consistent with the results of wavelet packet analysis.

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“…Jia et al (2017) established a dynamic characteristic model of crash-damaged and slip-damaged rock blocks. The relationship between the safety factor and natural vibration frequency was identified on the basis of the dynamic characteristic model and limit equilibrium method, and safety evaluation and early warning monitoring plans for rock blocks were established based on the natural vibration frequency (Du and Xie, 2022). , Du et al (2021) and Du et al (2017) studied the collapse mechanism and early warning index of dangerous rock through experiments.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on damage identification of topping dangerous rock structural surface based on dynamic characteristic parameters

et al. 2022

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Rock block tilting is one of the most common types of dangerous rock block failures with no clear indicator of displacement prior to failure. Existing stability evaluation methods remain limited in their ability to constrain the non-penetrating section area, which is closely related to rock stability, and stability evaluations are therefore associated with large uncertainties. The dynamic characteristic parameters of toppling dangerous rock are closely related to structural plane strength. Under vibration loading, rainfall, and/or excavation unloading conditions, the structural plane becomes damaged and the dynamic characteristic parameters change. In this study, we present a dynamic characteristic model of rock tilting and identify the quantitative and qualitative relationship between dynamic characteristic parameters and the bonded area of the structural plane. The model accuracy is verified by experiments. The experimental results show that the damping ratio decreases linearly with structural plane damage, whereas the maximum vibration speed and particle trajectory increases nonlinearly and the natural vibration frequency decreases nonlinearly. The dynamic characteristic model and experimental results can be used to evaluate the degree of structural surface damage of toppling dangerous rock.

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Indirect method for the quantitative identification of unstable rock

Cited by 10 publications

References 30 publications

Numerical simulation of creep fracture evolution in fractured rock masses

Numerical simulation of creep fracture evolution in fractured rock masses

Study on the Dynamic Stability and Spectral Characteristics of a Toppling Dangerous Rock Mass under Seismic Excitation

Experimental research on damage identification of topping dangerous rock structural surface based on dynamic characteristic parameters

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