Determination of statistical discontinuity persistence for a rock mass characterized by non-persistent fractures

Zhou, Wen; Lan, Zhiguang; Ma, Zhifa; Tan, Chun; Que, Jinsheng; Wang, Fengyan; Cao, Chen

doi:10.1016/j.ijrmms.2019.104177

Cited by 40 publications

(12 citation statements)

References 49 publications

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“…Rectangular areas were selected for window sampling because of the perpendicular shape of the blocks, and the side lengths of the rectangles were twice as long as the sides of the largest blocks. The results of the manual methods were combined with the results of automatic and semi-automatic image analysis techniques [22,47,62,73,76,77,80,84,85] applied to the 3D HRPC model and used to determine the size of the relevant block.…”

Section: Results Of the Geological And Geotechnical Surveymentioning

confidence: 99%

Geotechnical Study of Raspadalica Cliff Rockfall, Croatia

2022

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The Raspadalica Cliff is an almost vertical 100 m high limestone cliff with a railway line at its foot and is known for numerous rockfall occurrences in the past. This article presents the results of the geotechnical study of the cliff based on a traditional geological and geotechnical field survey and remote sensing analysis. Both the traditional geological and geotechnical field survey and remote sensing surveys and analyses enabled the establishment of the structural model of the Raspadalica Cliff and the determination of the discontinuity sets and discontinuity features, such as orientation, spacing, persistence, roughness, discontinuity wall strength, aperture, degree of weathering of discontinuity wall, seepage conditions, and the presence and hardness of discontinuity filling. Kinematic analyses were performed on five cliff zones with slightly different structural features, indicating a relatively low probability of typical failures in the cliff rock mass that precede the rockfall occurrences. Although rockfall phenomena from the cliff face are relatively frequent, the kinematic analyses did not indicate a high probability of their occurrence. The aim of this manuscript is to make scientists and practitioners aware that investigation of rock mass cliffs and possible rockfall failures must not be based on usual methods without critical review of the obtained results and consequences. The combined use of traditional geological and geotechnical methods and more commonly used advanced remote sensing methods leads to better modelling, while the analysis of more associated failure modes can explain the triggering of rockfall.

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Section: Results Of the Geological And Geotechnical Surveymentioning

confidence: 99%

Geotechnical Study of Raspadalica Cliff Rockfall, Croatia

2022

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“…To validate whether the CEL method can be applied to fluid-structure coupling and to calibration of water parameters, a numerical test of water collapse was performed. The original physical test was conducted by Kushizuka, et al (1995) [36], and it has been widely used for the validation of the free surface flow problems and fluid-structure coupling [37,38]. In the test, a water column was presented in the water tank, and the collapse behavior of the water column under the influence of gravity was recorded.…”

Section: Model Validationmentioning

confidence: 99%

Effect of the Fracturing Degree of the Source Rock on Rock Avalanche River-Blocking Behavior Based on the Coupled Eulerian-Lagrangian Technique

et al. 2022

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In this study, the effect of the fracturing degree of the source rock on rock avalanche river-blocking behavior was investigated. The study included the analysis of mass movement behavior, impulse wave behavior, and the formation of landslide dams. The study included a series of simulations of rock avalanche river-blocking based on the coupled Eulerian-Lagrangian (CEL) technique. Prior to the simulation, a water column collapse model was applied to validate the use of the CEL technique on fluid-structure interaction, and to calibrate the material parameters. The source rock in the rock avalanche simulation was cut by different groups of structural planes, with the number of 0 × 0 × 0, 1 × 1 × 1, 4 × 4 × 4, 9 × 9 × 9, 14 × 14 × 14, 19 × 19 × 19 in each dimension, respectively, to represent different fracturing degrees, on the premise of the same volume and shape of the source rock. The simulation results showed that the sliding mass exhibited structure stabilization, such that the structure of the sliding mass gradually stabilized to a steady status over time, in the mass movement process. The structure stabilization made the center of the sliding mass constantly decrease, and provided a higher speed of movement for the rock avalanches with higher fracturing degrees of the source rock. As for the impulse wave behavior, with the increase in the fracturing degree of the source rock, the maximum kinetic energy of the water decreased, and the maximum height and propagation speed of the impulse waves decreased, which indicated that the maximum height and the propagation speed of the impulse waves were positively correlated with the maximum kinetic energy of the water. In regard to the formation of the landslide dams, when the fracturing degree of the source rock was low, the shape of the landslide dam was very different. With the increase of the fracturing degree of the source rock, the shapes of the landslide dams stabilized, and varied slightly after the fracturing degree of the source rock reached a threshold value.

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“…Field investigation demonstrated that no fillings existed in fractures, implying that the cohesion of small fractures is equal to zero (i.e., c f = 0). The linear persistence is defined as the ratio of fracture trace lengths (only the trace lengths of small fractures in the rock mass between the large fractures are considered in the present study) to the total length of the coplanar given line (Shang et al, 2018;Zhang et al, 2020b). In the present study, several lines along different directions are set in the rock mass between the large fractures, and then the linear persistence is measured.…”

Section: Parameter Determination For Srm Modelmentioning

confidence: 99%

“…By coupling the DFN technique with continuum, discontinuum, and hybrid modelling approaches, synthetic rock mass (SRM) models can be set up to investigate the mechanical properties of fractured rock masses (Elmo and Stead, 2009;Mas Ivars, 2010;Pierce et al, 2007). The SRM approach has been widely used to determine the representative elementary volume size of a fractured rock mass (Esmaieli et al, 2010), reproduce rock mass properties and behaviours (Mas Ivars et al, 2011), and simulate fracture propagation in a fractured rock mass (Zhang and Stead, 2014). SRM models have been primarily used to simulate failure and deformation of fractured rock slopes (Bonilla-Sierra et al, 2015;Elmo et al, 2013); simulate hydraulic fracturing in naturally fractured reservoirs (Damjanac and Cundall, 2016); and estimate rock mass strength, fragmentation, and microseismicity in caving mines (Lorig et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Stability evaluation and potential failure process of rock slopes characterized by non-persistent fractures

Wen

Wang

et al. 2020

Nat. Hazards Earth Syst. Sci.

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Abstract. Slope failure, which causes destructive damage and fatalities, is extremely common in mountainous areas. Therefore, the stability and potential failure of slopes must be analysed accurately. For most fractured rock slopes, the complexity and random distribution of structural fractures make the aforementioned analyses considerably challenging for engineers and geologists worldwide. This study aims to solve this problem by proposing a comprehensive approach that combines the discrete fracture network (DFN) modelling technique, the synthetic rock mass (SRM) approach, and statistical analysis. Specifically, a real fractured rock slope in Laohuding Quarry in Jixian County, China, is studied to show this comprehensive approach. DFN simulation is performed to generate non-persistent fractures in the cross section of the slope. Subsequently, the SRM approach is applied to simulate the slope model using 2D particle flow code software (PFC2D). A stability analysis is carried out based on the improved gravity increase method, emphasizing the effect of stress concentration throughout the formation of the critical slip surface. The collapse, rotation, and fragmentation of blocks and the accumulation distances are evaluated in the potential failure process of the rock slope. A total of 100 slope models generated with different DFN models are used to repeat the aforementioned analyses as a result of a high degree of variability in DFN simulation. The critical slip surface, factor of safety, and accumulation distance are selected by statistical analysis for safety assurance in slope analysis and support.

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Determination of statistical discontinuity persistence for a rock mass characterized by non-persistent fractures

Cited by 40 publications

References 49 publications

Geotechnical Study of Raspadalica Cliff Rockfall, Croatia

Geotechnical Study of Raspadalica Cliff Rockfall, Croatia

Effect of the Fracturing Degree of the Source Rock on Rock Avalanche River-Blocking Behavior Based on the Coupled Eulerian-Lagrangian Technique

Stability evaluation and potential failure process of rock slopes characterized by non-persistent fractures

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