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Modeling and Simulation of Dynamic Unloading of Prestressed Rockmass

Computer Modeling in Engineering & Sciences 2019年第8期120卷 421-443页

作者： Liang Wu Xiaorui Xiang Yang Chen karrech ali Junru Zhou Ming Chen College of Science Wuhan University of Science and TechnologyWuhan430065China School of Civil and Resource Engineering the University of Western Australia35 Stirling HwyCrawley WA 6009Australia Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education Wuhan UniversityWuhan430072China

During the excavation of deep rock,a sudden change in boundary conditions will cause the in-situ stress on the excavation surface to release *** disturbance propagates in the form of an unloading stress wave,which will enlarge the damage field of surrounding *** this paper,the dynamic unloading problem of the insitu stress in deep rock excavation is studied using theoretical,numerical,and experimental ***,the dynamic unloading process of rock is analyzed through adopting the wave equation,and the equivalent viscous damping coefficient of the material is taken into *** show that there is significant tensile strain in the rock bar when the strain rate is above 10^-1 s^-*** an increase in the length or damping coefficient,the wave state will change from an underdamped to an overdamped ***,implicit and explicit solvers of the finite element method are employed to simulate rock unloading processes,which can be used to verify the theoretical results from one-dimensional to three-dimensional stress ***,the dynamic unloading experiment of a onedimensional bar is used to further verify the validity and accuracy of the theoretical analysis.

关键词： Deep rock mass dynamic unloading damping strain rate wave equation

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Exploring the frontiers of deep underground sciences and engineering—China Yunlong Lake Laboratory is striving to be the best

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Deep Underground Science and Engineering 2022年第2期1卷 131-137页

作者： Lihua Hu Jianguo Wang ali karrech Xiaozhao Li Peng Zhao Lulu Liu State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouChina Department of Civil Environmental and Mining EngineeringUniversity of Western AustraliaAustralia

This paper introduces the establishment of deep underground infrastructure for science and engineering ***,the representative deep underground research laboratories and facilities in the world and their functions were summarized and ***,the plan and service target of China Yulong Lake Laboratory were proposed for the storage of resources and energy,as well as the sealing of hazardous waste in deep underground *** this basis,this paper reveals how the facility addresses its key scientific issue on“The law of fluid matter migration in deep underground space”and engineering ***,the construction progress of the facility components was demonstrated in *** is hoped,this paper would provide useful reference to the deep underground research community;meanwhile,international collaboration on deep underground research is highly welcome.

关键词： fluid matter migration large spatial scale long time scale multi-lithology research laboratory and facility underground space

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Optimizing the solar energy capture of residential roof design in the southern hemisphere through Evolutionary Algorithm

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能源与人工环境(英文) 2021年第4期2卷 406-424页

作者： Saleh Kaji Esfahani ali karrech Robert Cameron Mohamed Elchalakani Rosangela Tenorio Fernando Jerez The Faculty of Arts BusinessLaw and EducationSchool of DesignUniversity of Western Australia6009 PerthWestern AustraliaAustralia Faculty of Engineering and Mathematical Sciences School of EngineeringUniversity of Western Australia6009 PerthWestern AustraliaAustralia The Australian Urban Design Research Centre University of Western Australia6000 PerthWestern AustraliaAustralia

Australia’s national energy system is heavily reliant on coal-fired power plants and requires quick action to de-crease CO_(2)emissions in order to meet the Paris climate change agreement by *** a good alternative to coal power,renewable resources can produce the required energy for Australia while keeping the environment *** annual amount of falling solar irradiation in Australia is a few thousand times higher than its energy consumption,but the amount of the collected solar energy is *** Perth,the sunniest city in Aus-tralia,one-third of the residential dwellings have roof-mounted solar collector ***,there have been limited studies into the integration of these systems in building design and it is still unknown which roof design can deliver maximum efficiency based on the local environmental ***,the aims of this study are to determine the optimum residential roof design in Perth,Western Australia and to maximise extracted solar power throughout a *** reach this aim,a combination of analytical modelling,numerical simulation,and evolutionary algorithm methods have been *** first,a series of detailed mathematical calculations were performed in Excel to find the optimum solar collector mounting *** the numerical simulation,the exam-ination was repeated in the Rhino-Grasshopper interface to verify the earlier findings and calibrate the chosen simulation package with the help of parametric *** the last step,a wide range of housing roof shapes has been tested by evolutionary algorithm plugin-Galapagos,to find the optimum roof shape design in the given *** results show that,unlike the traditional approach and common belief,a roof shape with a 25-degree tilt angle,170-175 azimuth angle,and aspect ratio of 1:1.2 is optimum to gain maximum solar gaining ***,this study advances the knowledge of solar capturing by suggesting a new parameter-oblique angle-in finding the op

关键词： Parametric architecture Solar gaining Roof form optimization Evolutionary algorithm

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Deep Geothermal: The ‘Moon Landing' Mission in the Unconventional Energy and Minerals Space

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Journal of Earth Science 2015年第1期26卷 2-10页

作者： Klaus Regenauer-Lieb Andrew Bunger Hui Tong Chua Arcady Dyskin Florian Fusseis Oliver Gaede Rob Jeffrey ali karrech Thomas Kohl Jie Liu Vladimir Lyakhovsky Elena Pasternak Robert Podgorney Thomas Poulet Sheik Rahman Christoph Schrank Mike Trefry Manolis Veveakis Bisheng Wu David A.Yuen Florian Wellmann Xi Zhang School of Petroleum Engineering University of New South WalesSydney NSW 2052Australia Earth Science and Resource Engineering CSIROKensington WA 6151Australia School of Earth and Environment The University of Western AustraliaPerth WA 6000Australia Department of Civil and Environmental Engineering & Department of Chemical and Petroleum Engineering University of PittsburghPittsburghPennsylvaniaUSA School of Geosciences University of EdinburghEdinburghUK Science and Engineering Faculty School of EarthEnvironmental and Biological SciencesEarth SystemsQueensland University of TechnologyBrisbaneAustralia Karlsruhe Institute of Technology KarlsruheGerman School of Earth Science and Geological Engineering Sun Yat-Sen University Geological Survey of Israel Jerusalem 95501Israel Idaho National Laboratory Idaho FallsUSA Land and Water CSIROFloreat Park WA 6014Australia School of Environmental Studies China University of Geosciences Department of Earth Sciences and Minnesota Supercomputing Institute University of MinnesotaMinneapolis MN 55455USA Aachen Institute for Advanced Study in Computational Engineering Science (AICES) RWTH Aachen University52062 AachenGermany

Deep geothermal from the hot crystalline basement has remained an unsolved frontier for the geothermal industry for the past 30 years. This poses the challenge for developing a new unconventional geomechanics approach to stimulate such reservoirs. While a number of new unconventional brittle techniques are still available to improve stimulation on short time scales, the astonishing richness of failure modes of longer time scales in hot rocks has so far been overlooked. These failure modes represent a series of microscopic processes： brittle microfracturing prevails at low temperatures and fairly high deviatoric stresses, while upon increasing temperature and decreasing applied stress or longer time scales, the failure modes switch to transgranular and intergranular creep fractures. Accordingly, fluids play an active role and create their own pathways through facilitating shear localization by a process of time-dependent dissolution and precipitation creep, rather than being a passive constituent by simply following brittle fractures that are generated inside a shear zone caused by other localization mechanisms. We lay out a new theoretical approach for the design of new strategies to utilize, enhance and maintain the natural permeability in the deeper and hotter domain of geothermal reservoirs. The advantage of the approach is that, rather than engineering an entirely new EGS reservoir, we acknowledge a suite of creep-assisted geological processes that are driven by the current tectonic stress field. Such processes are particularly supported by higher temperatures potentially allowing in the future to target commercially viable combinations of temperatures and flow rates.

关键词： geothermal energy enhanced geothermal systems fracture mechanics creep dissolution precipitation.

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岩石圈动力学三重破坏模型与初步应用

岩石圈动力学三重破坏模型与初步应用

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2014年中国地球科学联合学术年会——专题40：青藏高原周缘的构造变形与深部动力学过程

作者：刘洁 Klaus Regeanuer-Lieb ali karrech Gideon Rosenbaum Vladimir Lyakhovsky University of Western Australia 中山大学地球科学与地质工程学院 CSIRO Earth Science and Resource Engineering University of New South Wales University of Queensland

基于非平衡热动力学原理,我们给出了一个综合力学破坏与局部熔融破坏的全新"三重破坏"模型:对于力学破坏,我们考虑了基于非平衡热动力学的弹黏塑性破坏;对于局部熔融,我们采用了平衡的热动力学模型(借助基于Gibbs能最小化原理的MELTS软...

基于非平衡热动力学原理,我们给出了一个综合力学破坏与局部熔融破坏的全新"三重破坏"模型:对于力学破坏,我们考虑了基于非平衡热动力学的弹黏塑性破坏;对于局部熔融,我们采用了平衡的热动力学模型(借助基于Gibbs能最小化原理的MELTS软件包[1-3])。该模型在统一的热动力学框架下,实现了对岩石圈浅部脆性破坏、中深部韧性破坏和深部局部熔融破坏的综合描述,因而被称为三重破坏模

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