Rapid In-Situ Stress Measurement in Vertical Borehole Based on Borehole Diametrical Deformation Analysis

Wang, Chao; Han, Zhengsheng; Wang, Yiteng; Wang, Chuanying; Wang, Jinchao; Hu, Sheng

doi:10.1007/s00603-023-03472-3

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…However, observing P 32 in nature is difficult. We thus constrain P 32 using an inferred P 10 value based on a multi‐dimensional intensity metric (Wang, 2005). The particular relation between P 32 and P 10 is implemented in FracMan, which we apply to generate the fracture network, using P 32 = 0.005/m.…”

Section: Model Setupmentioning

confidence: 99%

Rupture Dynamics of Cascading Earthquakes in a Multiscale Fracture Network

Palgunadi,

Gabriel,

Garagash

et al. 2024

JGR Solid Earth

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Fault‐damage zones comprise multiscale fracture networks that may slip dynamically and interact with the main fault during earthquake rupture. Using 3D dynamic rupture simulations and scale‐dependent fracture energy, we examine dynamic interactions of more than 800 intersecting multiscale fractures surrounding a listric fault, emulating a major listric fault and its damage zone. We investigate 10 distinct orientations of maximum horizontal stress, probing the conditions necessary for sustained slip within the fracture network or activating the main fault. Additionally, we assess the feasibility of nucleating dynamic rupture earthquake cascades from a distant fracture and investigate the sensitivity of fracture network cascading rupture to the effective normal stress level. We model either pure cascades or main fault rupture with limited off‐fault slip. We find that cascading ruptures within the fracture network are dynamically feasible under certain conditions, including: (a) the fracture energy scales with fracture and fault size, (b) favorable relative pre‐stress of fractures within the ambient stress field, and (c) close proximity of fractures. We find that cascading rupture within the fracture network discourages rupture on the main fault. Our simulations suggest that fractures with favorable relative pre‐stress, embedded within a fault damage zone, may lead to cascading earthquake rupture that shadows main fault slip. We find that such off‐fault events may reach moment magnitudes up to Mw ≈ 5.5, comparable to magnitudes that can be otherwise hosted by the main fault. Our findings offer insights into physical processes governing cascading earthquake dynamic rupture within multiscale fracture networks.

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Section: Model Setupmentioning

confidence: 99%

Rupture Dynamics of Cascading Earthquakes in a Multiscale Fracture Network

Palgunadi,

Gabriel,

Garagash

et al. 2024

JGR Solid Earth

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“…Literature reported the typical ranges of internal and external factors of rock mass. For evaluation of these factors, different destructive and nondestructive techniques can be employed [4,[29][30][31]. Various simulation tools were also discussed in different studies for the prediction of rock mass internal and external factors.…”

Section: Introductionmentioning

confidence: 99%

The Evaluation of Rock Mass Characteristics against Seepage for Sustainable Infrastructure Development

et al. 2022

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The determination of rock seepage characteristics is a complex phenomenon due to the variability, discontinuities, and formation age of rocks. The available literature on rock mechanics covers empirical relationships and approaches for the estimation of seepage characteristics from the rock mass parameters. In this study, an area comprising of infrastructure such as a water reservoir, embankments, roads, etc., constructed on mix rock mass formations was selected. The field and laboratory tests’ geo-mechanical data for the study area were evaluated. The data obtained from the field geo-mechanical engineering tests like Rock Quality Designation (RQD), Rock Core Recovery, Lugeon, etc., were analyzed. The data retrieved from the geological and geotechnical laboratory tests such as petrography, uniaxial compression, Hoek shear, elastic modulus, etc., were also evaluated. Rock mass was characterized based on petrographic and RQD, and was found in the hybrid formation of igneous, metamorphic, and sedimentary deposits. Seepage analysis in the study area was also carried out based on adit and piezometric data (installed in accordance with the mining technology guidelines), using Seep W Finite Element Method (FEM). The seepage observed in adits were compared with seepage calculated from Seep W. The trend of simulated flux was also presented against K ratio. Seepage quantities for different ranges of K ratio were plotted to evaluate interdependency between seepage and K ratio. Correlations of RQD were developed with hydraulic conductivity “k” for igneous, metamorphic, and sedimentary rocks for quick assessment of seepage characteristics of rock mass by RQD. These correlations and seepage related evaluations will be beneficial for the characterization of rock mass in relation to seepage for sustainable infrastructure development.

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Rapid In-Situ Stress Measurement in Vertical Borehole Based on Borehole Diametrical Deformation Analysis

Cited by 2 publications

References 33 publications

Rupture Dynamics of Cascading Earthquakes in a Multiscale Fracture Network

Rupture Dynamics of Cascading Earthquakes in a Multiscale Fracture Network

The Evaluation of Rock Mass Characteristics against Seepage for Sustainable Infrastructure Development

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