Qinghua Lei

Coupled hydromechanical responses around a roadway excavation in inclined coal–mudstone strata

Chenxi Zhao, Fuqiang Gao, Qinghua Lei, Shuangyong Dong et autres

Abstract We conduct a numerical investigation into the spatio-temporal evolution of excavation-induced disturbances around roadways in inclined coal–mudstone strata containing fracture networks. The intact rock is modeled using a Mohr–Coulomb plastic constitutive law to capture deformation and failure, while the displacement of …

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Influence of fracture network connectivity and size distribution on injection-induced seismicity in two-dimensional fractured rocks

Iman Vaezi, Chin‐Fu Tsang, Qinghua Lei

Fluid injection into fractured rocks can trigger seismicity through hydro-mechanical interactions. We perform 2D fully coupled hydro-mechanical simulations, based on the finite element method and the discrete fracture network approach, to quantify how fracture network geometry controls pressure diffusion, damage growth, fracture …

Surrogate‐Assisted Bayesian Inference of Fracture Network Parameters From Elastic Waves: A Sensitivity‐Guided Approach

Le Zhang, Qinghua Lei, Longjun Dong, Chuanyin Jiang et autres

Abstract We develop a sensitivity‐guided, surrogate‐assisted Bayesian framework to infer fracture network parameters from elastic waves. Synthetic fracture networks characterized by power‐law length exponent , fracture density , and percolation parameter are constructed. Elastic wave propagation through these fracture networks is then …

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Fracture–Matrix Flow Partitioning Governs Retention Regime Transitions in Unsaturated Fractured Rock

Muhammad Andiva Pratama, C. Jiang, Martin Ziegler, Qinghua Lei

Abstract Upscaling unsaturated flow in fractured rock remains challenging because fractures and matrix often exhibit sharply contrasting hydraulic behaviors across saturation states. Here, we demonstrate that unsaturated flow undergoes a transition between matrix‐ and fracture‐dominated regimes. Three‐dimensional direct numerical simulations reveal that …

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Influence of geomechanical loading configuration on modeling stress-dependent flow and transport in 3D fractured rocks

Nicholas Izuchukwu Osuji, Chuanyin Jiang, Auli Niemi, Chin‐Fu Tsang et autres

Boundary conditions (BCs) in geomechanical modeling are typically prescribed as pure stress, pure displacement, or mixed formulations. However, their effects on flow and transport in three-dimensional fractured rock systems have not been systematically investigated, creating uncertainty in stress-dependent hydraulic response. This paper …

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A coupled thermo–hydraulic model with phase change and local thermal nonequilibrium for simulating freeze–thaw dynamics in fractured porous media

Jia-Jing Lin, Chuanyin Jiang, Chin-Fu Tsang, Auli Niemi et autres

Seasonal freeze–thaw cycles pose major challenges to underground infrastructures in cold regions, where rock fractures exert strong control over subsurface fluid flow, heat transfer, and ice formation. However, the role of fracture–matrix interactions during freezing and thawing remains poorly understood. In this …

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The PF-A experiment: in-situ progressive failure of faulted Opalinus Clay — insights from underground excavation, laboratory tests, and numerical simulations

Martin Ziegler, Senecio Schefer, Markus Furche, Thies Beilecke et autres

The PF/PF-A (Progressive Failure of Structurally Controlled Overbreaks) experiment examines how structurally controlled rock mass damage evolves and spreads in faulted Opalinus Clay shale excavations. The project includes an in-situ experiment, installed at the Main Fault of the Mont Terri rock laboratory …

Numerical simulation of damage evolution around the PF/PF-A experiment borehole in faulted Opalinus Clay

Qinghua Lei, Chenxi Zhao, Muhammad Raharsya Andiva, Martin Ziegler

The Progressive Failure (PF/PF-A) experiment at the Mont Terri rock laboratory offers a unique opportunity to investigate damage evolution around underground openings in faulted Opalinus Clay under in-situ stress conditions. We present a 3D numerical modelling framework developed to simulate progressive failure …

Surrogate-Assisted Bayesian Inference of Fracture Network Parameters from Elastic Waves: A Sensitivity-Guided Approach

Le Zhang, Qinghua Lei, Chuanyin Jiang, Longjun DONG et autres

We develop a sensitivity-guided, surrogate-assisted Bayesian framework to infer fracture network parameters from elastic waves. Synthetic fracture networks characterized by power-law length exponent \(a\), fracture density \(d\), and percolation parameter \(p\) are constructed. Elastic wave propagation through these fracture networks is then …

Adsorption Preceding Wetting Front Controls Seismic Velocity

Rui Xue Wu, Hongpu Kang, Fuqiang Gao, Xiangyuan Peng et autres

Abstract Rock elasticity varies with both humidity and water saturation, yet their combined effects remain poorly understood, although in nature vapor adsorption and liquid infiltration occur simultaneously. Here, we present experimental data of P‐wave velocity and volume expansion in a free‐standing sandstone …

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Reply on RC3

Qinghua Lei

Abstract. Many catastrophic events, including landslides, rockbursts, glacier breakoffs, and volcanic eruptions, are preceded by an observable acceleration phase that offers a critical window for early warning and hazard mitigation; however, the duration of this precursory phase remains poorly constrained across sites, …

se (code pays fourni par la source)

Reply on RC2

Qinghua Lei

Abstract. Many catastrophic events, including landslides, rockbursts, glacier breakoffs, and volcanic eruptions, are preceded by an observable acceleration phase that offers a critical window for early warning and hazard mitigation; however, the duration of this precursory phase remains poorly constrained across sites, …

se (code pays fourni par la source)