检索结果-内蒙古大学图书馆

Development and validation of TOUGH-3DEC: A three-dimensional discontinuum-based numerical simulator for coupled thermo-hydro-mechanical analysis

引用

GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT 2025年 42卷

作者： Kwon, Saeha Kim, Kwang-Il Lee, Changsoo Lee, Jaewon Kim, Jin-Seop Korea Atom Energy Res Inst 111 Daedeok Daero 989Beon gil Daejeon 34057 South Korea

The discontinuum-based numerical methods can simulate the coupled thermo-hydro-mechanical (THM) processes in porous media with multiple discontinuities, so it is appropriate to model the mechanical behavior of a fractured host rock under the coupled processes such as a geological repository for high-level radioactive waste. TOUGH-3DEC, a three-dimensional discontinuum-based simulator for the coupled THM analysis, was developed by linking the integral finite difference method TOUGH2 and the distinct element method 3DEC to describe the coupled THM processes in porous media and discontinuous media. TOUGH2 handles the coupled TH analysis through the internal simulation module, while 3DEC performs mechanical analysis based on the constitutive models of porous media and discontinuity, coupling the thermal and hydraulic responses from TOUGH2. The thermal and hydraulic couplings are key processes and should be carefully verified by sufficient cases, so this study performed TM and HM verifications by modelling analytic solutions including the uniaxial consolidation, fracture static opening, and the heating of a hollow cylinder. As comparative validations, two models describing laboratory-scale experiments regarding the HM and TM processes of fractured rock were simulated and compared to the experimental results. The developed TOUGH-3DEC simulator showed sufficient accuracy in reflecting the coupled THM processes of the small-scale discontinuous rock, but still needs to be verified by more complicated and large-scale coupled process problems to be applicable to the demonstration of the field-scale model requiring the coupled THM processes of various geological media, such as a multi-barrier system of a geological repository.

关键词： Numerical simulations Coupled processes Discontinuum Fractured rock distinct element method TOUGH 3DEC

来源：评论

学校读者我要写书评

暂无评论

Calibration and intelligent optimization for DEM numerical parameters in heterogeneous rock mass

引用

COMPUTERS AND GEOTECHNICS 2025年 177卷

作者： Shang, Runpeng Yang, Yugui Huang, Bingxiang Chen, Yong Qiu, Chao Liu, Wang China Univ Min & Technol State Key Lab Intelligent Construct & Hlth Operat Xuzhou 221116 Jiangsu Peoples R China China Univ Min & Technol State Key Lab Fine Explorat & Intelligent Dev Coal Xuzhou 221116 Jiangsu Peoples R China

Calibrating meso parameters is a crucial step in modeling rock materials using the distinct element method (DEM). Improved calibration methods integrating machine learning and optimization algorithms have been proposed to revise the time-consuming conventional trial-and-error approach. This study introduces an innovative calibration method for heterogeneous DEM numerical parameters, optimized with the improved DBO algorithm (IDBO) utilizing Latin Hypercube Sampling combined with Gaussian Processes (GP-LHS) for initialization and hybrid strategies for iteration. Findings suggest the proposed enhanced heterogeneous DEM calibration method can accurately reproduce laboratory results and similar material experiments. Additionally, this method performs better than the DBO-DEM, PSO-DEM, and GA-DEM calibration methods in heterogeneous DEM parameters calibration speed with the same accuracy requirement during unconfined compression tests. The findings affirm the potential of the method for heterogeneous DEM numerical parameters calibration.

关键词： distinct element method Dung Beetle Optimizer Parameter calibration Heterogeneity Latin Hypercube Sampling Gaussian Process

来源：评论

学校读者我要写书评

暂无评论

Influence of 3D joint roughness on fracture behaviours of rock mass subjected to compression

引用

GEOMATICS NATURAL HAZARDS & RISK 2024年第1期15卷

作者： Gou, Qi Wang, Peitao Jing, Guoye Cai, Meifeng Univ Sci & Technol Beijing Beijing Key Lab Urban Underground Space Engn Beijing Peoples R China Univ Sci & Technol Sch Civil & Resources Engn Beijing Peoples R China Univ Sci & Technol Beijing Minist Educ Efficient Min & Safety Met Mine Key Lab Beijing Peoples R China

Jointed rock mass with internal rough structural planes have a significant influence on the mechanical behaviour and damage mode of the rock mass. Based on the Weierstrass-Mandelbrot (W-M) fractal function, a numerical model containing a single rough fracture was established. Multi-parameters sensitivity analysis was carried out to determine the key parameters affecting the mechanical properties. By conducting experimental research on the single fracture inclination, fractal dimension, and surface precision of numerical model uniaxial compression, the influence laws of different parameters and the model cracking process were revealed. The results show that the cracks go through the process of sprouting from the single fracture and expanding to both sides, and the expansion of shear cracks in the structural plane reflects the roughness pattern of the structural plane. The higher the roughness was, the lower the peak uniaxial compression strength of the model was. The change of the parameters influenced the macroscopic cracking morphology of the model, and the model finally showed the destruction along the diagonal, the V-shaped destruction, the X-like destruction, and the X-type destruction. The results have an outstanding reference value for further researches on the application of three-dimensional rough discrete fracture networks.

关键词： Joint roughness rough fracture failure pattern numerical simulation distinct element method

来源：评论

学校读者我要写书评

暂无评论

A modified Prandtl's model for predicting the bearing capacity of lunar soil ground under extraterrestrial gravitational environment

引用

ACTA ASTRONAUTICA 2025年 234卷 59-72页

作者： Xi, Banglu Jiang, Mingjing Qi, Lin Yang, Jiaqiang Chen, Mingliang Hefei Univ Technol Collage Civil Engn Hefei 230009 Peoples R China Suzhou Univ Sci & Technol Sch Civil Engn Suzhou 2150092 Jiangsu Peoples R China

The prediction on bearing capacity of regolith on the Moon plays an important role in the design and construction of the future lunar base. However, the classical analytical methods are developed on Earth for terrestrial soils, which may be unable to predict the bearing capacity of lunar soil on the Moon since the gravity effect on the bearing behavior is excluded. Therefore, the assumptions in Prandtl's bearing capacity theory were first examined and the gravity effect on such assumptions was detailedly analyzed based on DEM simulations of plate loading tests under different gravity fields. Then a modified Prandtl's model considering the gravity effect was developed and verified with the experimental data under different gravity fields. The results showed that the modified Prandtl's model predicts bearing capacities within 50 % error of experimental data under different gravity fields, which implies that the modified Prandtl's model can well capture the gravity effect on the bearing capacity of lunar soil and its simulants.

关键词： Lunar base Lunar regolith Bearing capacity Gravity effect distinct element method

来源：评论

学校读者我要写书评

暂无评论

Suitability and mechanistic validation of two-dimensional bonded block models for simulating spalling and strainbursting at the mine tunnel scale

引用

COMPUTERS AND GEOTECHNICS 2025年 183卷

作者： Roy, Justin Eberhardt, Erik Univ British Columbia Dept Earth Ocean & Atmospher Sci Geol Engn Vancouver BC Canada

Spalling and strainbursting are common mechanisms for tunnel instability in high-stress environments with massive to moderately jointed rock mass conditions. These mechanisms are complex and not adequately captured for ground support design using conventional analytical, empirical, and numerical approaches due to the inability to address: i) stress fracture localization and directional deformation, ii) variable energy release rates for gradual spalling and discrete strainbursting events under mining-induced loading paths, and iii) the localized deformation and energy demands imposed on the ground support from the spalling or strainbursting ground. Explicit numerical simulation of the spalling and strainbursting mechanisms with bonded block models has the potential to considerably improve the engineering design and ground support of deep mining and civil tunnels;however, very few studies have applied this approach. This article addresses the suitability and mechanistic validation of two-dimensional bonded block models using the distinct element method for simulating spalling and strainbursting at the mine tunnel scale. The critical importance of mechanical damping parameters is highlighted and shown with conceptual simulations, and a preferred damping mode is identified. A contact constitutive model with linear strain softening is introduced and tested, which increases control over energy release rates and damage evolution in the simulations. The models are validated to show they capture the correct rupture modes, depth of spalling/strainbursting, and kinetic energy release for a range of common rock types. The results provide a helpful engineering tool for excavation and ground support design for spalling and strainbursting behaviours.

关键词： Spalling Strainburst Rockburst Bonded block model distinct element method Numerical modelling

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of hydraulic fracturing optimization in multi-well and multi-layer shale gas development: Insights from inter-well interference analysis

GEOENERGY SCIENCE AND ENGINEERING

引用

GEOENERGY SCIENCE AND ENGINEERING 2025年 250卷

作者： Du, Botong Zhang, Fengshou Dontsov, Egor Meng, Keyu Tongji Univ Coll Civil Engn Dept Geotech Engn Shanghai 200092 Peoples R China Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China ResFrac Corp Palo Alto CA 94301 USA

The development of unconventional shale gas is gradually evolving towards multi-layer and multi-well developments with small well spacing to improve resource recovery. However, the inter-well interference mechanism and the procedures for determining an optimal well spacing in multi-layer developments remain unclear. This study establishes a field-scale distinct element numerical modeling based on the data from the Luzhou deep shale gas reservoir, in Southwest China. The hydraulic fracturing process of three staggered wells is hydro- mechanically simulated, followed by an analysis of the interaction mechanism between multiple wells and the effect of well spacing on hydraulic fracturing. The results show that the effect of interference between wells on fracturing effectiveness varies non-linearly with increasing well spacing. Fracture growth is limited when well spacing is too small, resulting in reduced stimulated reservoir volume (SRV). Excessive well spacing is detrimental to the formation of complex fracture networks and results in a waste of reservoir resources between wells. Furthermore, a multi-factor scoring method was proposed to evaluate the effectiveness of hydraulic fracturing. This method considers reservoir stimulation, fracture network quality, and resource utilization to generate comparable scores. The assessment result clearly shows that an optimal well spacing exists for multi-well and multi-layer development and numerical modeling can be used to identify this value. This study describes a possible mechanism for multi-well interactions and provides a methodology for the design of multi-well and multi-layer developments in Luzhou and related shale gas development areas.

关键词： distinct element method Multi-layer shale gas development Hydraulic fracturing Well spacing optimization

来源：评论

学校读者我要写书评

暂无评论

Numerical investigation of large-slope planar failure considering entrainment effects: New insights into the 2009 JWS event

引用

ENGINEERING GEOLOGY 2025年 346卷

作者： Liu, Yinpeng Song, Chuang Li, Zhenhong Peng, Jianbing Changan Univ Coll Geol Engn & Geomat Xian 710054 Peoples R China Changan Univ Big Data Ctr Geosci & Satellites Xian 710054 Peoples R China Key Lab Loess Xian 710054 Peoples R China Minist Educ Key Lab Western Chinas Mineral Resources & Geol En Xian 710054 Peoples R China Minist Nat Resources Key Lab Ecol Geol & Disaster Prevent Xian 710054 Peoples R China

On 5th June 2009, a massive rapid long run-out rock avalanche occurred at the Jiweishan (JWS) area in Chongqing Municipality, China, which claimed 74 lives and injured an additional eight. Previous studies have applied numerical simulation to analyze the post-failure behavior of the JWS rock avalanche over the last decade, but the simulations conducted so far have not fully captured the lateral rock movements, the entrainment of slide mass on weathered blocks at the slope toe, and the subsequent deposition of the debris. This study simulates the planar failure at the initiation of the rock avalanche by three-dimensional (3D) numerical modeling to model the debris movement and deposition of the rock avalanche under the brittle failure of the key block at the front of the slope. The 3D topography and local joint sets are considered in the calculations, with the joint sets cutting the sliding rock mass into irregularly shaped blocks. The shoveling effects are considered to erode the hill ahead of the slope toe to expand the area of influence and match the actual topography. The 3D numerical modeling accurately captured the fundamental characteristics of the rock avalanche, resulting in a post-failure configuration closely resembling what was observed in the field. This method of quantitatively establishing a shoveling model based on field survey results can serve as a reference for the early warning and risk assessment of similar rock avalanche events.

关键词： JWS rock avalanche Planar failure Polyhedral blocks Shoveling effect distinct element method

来源：评论

学校读者我要写书评

暂无评论

Mechanisms detection by nonlinear finite and distinct element simulations of a historical religious masonry complex

引用

BULLETIN OF EARTHQUAKE ENGINEERING 2025年 1-45页

作者： Schiavoni, Mattia Di Giosaffatte, Martina Roscini, Francesca Clementi, Francesco Univ Politecn Marche Dept Construct Civil Engn & Architecture DICEA Via Brecce Bianche 12 I-60131 Ancona Italy Niccolo Cusano Univ Dept Engn Via Don Carlo Gnocchi 3 I-00166 Rome Italy

The detection of collapse mechanisms in masonry structures poses a critical challenge in structural engineering, particularly when dealing with complex historical buildings under seismic loading. Masonry structures exhibit highly non-linear mechanical behaviour due to their composite nature, characterized by discontinuities, weak tensile strength, and anisotropy. Accurately capturing these failure mechanisms, which include cracking, crushing, and sliding along joints, is essential for evaluating their seismic vulnerability. This paper focuses on the mechanical challenges of simulating collapse mechanisms in a masonry historical religious complex, significantly damaged during the 2016 Central Italy earthquake. Nonlinear numerical simulations are carried out to model the structure's response to seismic loads implementing both the Finite element method, based on Concrete Damage Plasticity and the distinct element method, studied using two different approaches: Discrete element method (DEM) and the Non-Smooth Contact Dynamics (NSCD). Despite their advanced properties in numerical simulation, neither method can fully capture the complexity of masonry collapse mechanisms. Instead, the combined and controlled use of both Finite and distinct element methods enhances the predictive accuracy of the simulations. Therefore, this study aims to propose a benchmark approach for damage analysis: through a methodological cross-assessment of their respective displacement behaviours, the time-step activations corresponding to local collapse mechanisms are identified. It is then demonstrated that together, these methods offer a more comprehensive approach to detecting collapse mechanism, with reciprocal compensating for the limitations of the other. This synergistic application is essential to address the inherent complexity of masonry mechanics, including material heterogeneity and non-linear failure progression.

关键词： Masonry Collapse mechanisms Finite element method distinct element method Non-linear dynamic analysis Cross-assessment analysis

来源：评论

学校读者我要写书评

暂无评论

Mechanical behavior of clayey methane hydrate-bearing sediment: Effects of pore size and physicochemical characteristics using a novel DEM contact model

引用

COMPUTERS AND GEOTECHNICS 2025年 178卷

作者： Zhang, Xudong Jiang, Mingjing Yin, Zhenyu Zhang, An Tianjin Univ Sch Civil Engn Tianjin 300072 Peoples R China Tongji Univ Coll Civil Engn Shanghai 200092 Peoples R China Suzhou Univ Sci & Technol Sch Civil Engn Suzhou 215009 Jiangsu Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hung Hom Kowloon Hong Kong Peoples R China Ocean Univ China Coll Environm Sci & Engn Qingdao 266100 Shandong Peoples R China

The mechanical behavior of Methane Hydrate-Bearing Sediment (MHBS) is essential for the safe exploitation of Methane Hydrate (MH). In particular, the pore size and physicochemical characteristics of MHBS significantly influence its mechanical behavior, especially in clayey grain-cementing type MHBS. This study employs the distinct element method (DEM) to investigate both the macroscopic and microscopic mechanical behavior of clayey grain-cementing type MHBS, focusing on variations in pore size and physicochemical characteristics. To accomplish this, we propose a Thermo-Hydro-Mechanical-Chemical-Soil Characteristics (THMCS) DEM contact model that incorporates the effects of pore size and physicochemical characteristics on the strength and modulus of MH. This THMCS model is validated using experimental data available in the literature. Using the proposed contact model, we conducted a series of investigations to explore the mechanical behavior of MHBS under conventional loading paths, including isotropic and drained triaxial tests using the DEM. The numerical results indicate that smaller pore sizes and lower water content-key physicochemical characteristics resulting from variations in electrochemical properties and the intensity of the electric field-can lead to reduced shear strength and stiffness due to the increased breakage of aggregates and weakened cementation. Additionally, heating was found to further accelerate the process of structural damage in MHBS.

关键词： distinct element method Methane hydrate-bearing sediments Thermo-hydro-mechanical-chemical-soil characteristics contact model Pore size Physicochemical properties

来源：评论

学校读者我要写书评

暂无评论

A Three-Dimensional Supporting Technology, Optimization and Inspiration from a Deep Coal Mine in China

引用

ROCK MECHANICS AND ROCK ENGINEERING 2024年第1期57卷 655-677页

作者： Guo, Feng Zhang, Nong Xie, Zhengzheng Han, Changliang Zhang, Chenghao Yuan, Yuxin He, Zhe Liu, Jinhu China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China Xuzhou Univ Technol Sch Civil Engn Xuzhou 221018 Jiangsu Peoples R China Univ Ghent Dept Civil Engn Lab Geotech B-9052 Zwijnaarde Belgium Xuzhou Coal Min Grp Co Ltd Xuzhou 221116 Jiangsu Peoples R China

The instability control of deep mining roadway is currently dominated by ejection and grouting, as well as floor support, which contradicts the economic and excavation efficiency of production. Taking the failure site of Xin'an Coal Mine in China as an example, this paper systematically analyzes the failure characteristics of supporting components, crack propagation, and surrounding rock deformation in situ, and the impact of failure on the rights and interests of staff, enterprise benefits, and low-carbon environmental protection. Then, a three-way continuous anchorage theory and the derived control technology are proposed based on the exploration of the instability mechanism. Besides, the UDEC Trigon model is adopted to reproduce the instability process and demonstrate the effect of the proposed control technology. According to the subsequent industrial test, the plastic deformation developing from shallow to deep parts leads to the bending, subsiding, swelling, and deformation of rock mass within 5.5 m of the roof, and the surrounding rock failure mainly features the shear failure in the middle of the tail of the supporting components and anchorage relaxation. Meanwhile, it wrecks huge havoc on the rights and interests of staff, enterprise benefits, and CO2 emission. Following the smooth application of the new technology to roadway excavation, the roof subsidence and two side displacements are reduced by 91.18% and 58.5%, respectively, compared with the original scheme, the rock mass fractures within 1.71 similar to 3.92 m of the roof is effectively sealed, the evolution depth of bed separation is down by 78.6%, and the excavation efficiency rises by 50% while ensuring the supporting cost. In addition, the defects of the new technology in engineering application are also discussed. Accordingly, the R&D and application of this new technology provide a positive reference for the efficiency control of deep mining roadway. Highlights center dot A three-way continuous

关键词： Deep underground engineering Coal pillar concentrated stress Coal-mudstone composite roof Three-way continuous support technology distinct element method

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：