A5086318631- Rock Mechanics and Modeling
- Landslides and related hazards
- Hydraulic Fracturing and Reservoir Analysis
- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Geophysical Methods and Applications
- Drilling and Well Engineering
- Geotechnical and Geomechanical Engineering
- Geotechnical Engineering and Analysis
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Geoscience and Mining Technology
- Hydrocarbon exploration and reservoir analysis
- Geotechnical Engineering and Underground Structures
- CO2 Sequestration and Geologic Interactions
- Mineral Processing and Grinding
- High-Velocity Impact and Material Behavior
- Geotechnical and construction materials studies
- Advanced Photocatalysis Techniques
- Multimodal Machine Learning Applications
- Geotechnical Engineering and Soil Stabilization
- Numerical methods for differential equations
- Advanced Text Analysis Techniques
- Geothermal Energy Systems and Applications
- Tunneling and Rock Mechanics
Xidian University
2022-2024
University of Science and Technology of China
2022-2024
Chinese Academy of Sciences
2024
ETH Zurich
2020-2023
University of Science and Technology Beijing
2017-2020
Kunming University of Science and Technology
2019-2020
Dalian University of Technology
2017
The measurement of the stress field and its natural heterogeneity is a common challenge in geophysics underground engineering. This study presents findings from an extensive mini-frac campaign conducted at Bedretto Underground Laboratory (BedrettoLab) Swiss Alps. Six dedicated boreholes, spanning 500 m along Tunnel, were utilized to prepare for meso-scale hydraulic stimulation experiments granitic rock volume. A detailed analysis induced fracture trace morphology was carried out using...
The Longmaxi shale is an extensive, prolific unconventional play in southwestern China. Its development the Changning area affected by ineffective hydraulic fracturing (HF) stimulation, fault reactivation and casing damage. It suspected that stress contrast within between reservoirs formations above below matters to fracture propagation reservoir stimulation. To this end, deserves a dedicated quantification of situ state its variations. In study, we re-visit available data from one play's...
Abstract We quantitatively investigate the spatial stress variations within fault zone rock mass by explicitly incorporating macroscopic fractures into a 2D multilayer model. Based on elastic crack theory, we first derive unified constitutive law for frictional fractures, featuring and plastic shear deformation shear‐induced dilatancy. To honor varying degrees of damage across zones, model is composed densities randomly oriented from layer to layer. Under boundary conditions specific global...
Abstract The in situ stress state within fault zones is technically challenging to characterize. At the Bedretto Underground Laboratory Swiss Alps, breakouts observed an array of eight inclined boreholes penetrating a zone offer unique opportunity characterize fault‐associated spatial variations. Synthesizing multiple geophysical logs, natural geologic structures intersecting these are identified, revealing hierarchy major along with secondary structures. Within boreholes, breakout rotations...
Quantum dot (QD) sensitized NiO photocathodes rely on efficient photoinduced hole injection into the valence band. A system of a mesoporous film co-sensitized with CdSe QDs and molecular proton-reduction catalyst was studied. While successful electron transfer from excited to is observed, most photogenerated holes are instead quenched very rapidly (ps) by trapping at surface thiols capping agent used as linker molecules. We confirmed our conclusion first using thiol free second varying...
Abstract Based on the assumption that fault slip dominates in stress relaxation brittle crust, Coulomb theory allows for crustal estimation with an empirical frictional coefficient. However, natural variability of friction and uncertainty exist Earth's crust. To address extent to which heterogeneous slips influence its evolution, we establish a quasi‐static, 2D model represent fractured rock mass. The consists randomly oriented fractures distribution coefficients. global mechanical response...
We apply binary logistic regression to correlate fracture shear-slip criticality hydraulic conductivity using data from four deep scientific boreholes in fractured crystalline rocks. In each borehole, an optimized decision boundary is obtained by maximizing the joint probability of classifying all fractures consideration as critical or not. All cases feature close empirical rock friction (μ = 0.6), corroborating applicability laboratory-derived coefficients faults situ. Utilizing this...
Abstract. The Tangshan region is one of the most seismically active areas in North China, and 1976 M 7.8 earthquake occurred on 28 July near fault zone. Matouying enhanced geothermal system (EGS) field located ∼90 km away from city Tangshan. Since late 2020, preliminary hydraulic stimulation tests have been conducted at depths ∼3965–4000 m. Fluid injection into reservoir facilitates a heat exchanger system. However, fluid may also induce earthquakes. In anticipation EGS operation uplift, it...
A shear strength reduction method based on a dual factoring strategy was considered in which cohesion and the coefficient of internal friction were each reduced by different factor. By using path introduced present study, series numerical tests conducted to bring slope into states critical equilibrium through definitions factor safety adopted some preceding studies evaluated. This found be more conservative than traditional method. Generally, defined limit should adopted, most probable under...
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Solid Earth. Version RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]Global Frictional Equilibrium via Stochastic, Local Coulomb SlipsAuthors Shihuai Zhang Xiaodong Ma iDSee all authors ZhangSwiss Federal Institute Technology...