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Mechanical response and stability analysis of rock mass in high geostress underground powerhouse caverns subjected to excavation

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Journal of Central South University 2020年第10期27卷 2971-2984页

作者： LI Biao DING Quan-fu XU Nu-wen LEI Yi-fan XU Yuan ZHU Zhong-ping LIU Jing-fei School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Department of Engineering Science University of OxfordOX51PFUnited Kingdom Sichuan Dadu River Shuangjiangkou Hydropower Development Co. Ltd.Maerkang 624099China Power China Chengdu Engineering Co. Ltd.Chengdu 610072China

To investigate the stability of rock mass in high geostress underground powerhouse caverns subjected to excavation,a microseismic(MS)monitoring system was established and the discrete element method(DEM)-based numerical simulation was carried *** tempo-spatial damage characteristics of rock mass were *** evolution laws of MS source parameters during the formation of a rock collapse controlled by high geostress and geological structure were ***,a three-dimensional DEM model of the underground powerhouse caverns was built to reveal the deformation characteristics of rock *** results indicated that the MS events induced by excavation of high geostress underground powerhouse caverns occurred *** large-stake crown of the main powerhouse was the main damage *** to the rock collapse,the MS event count and accumulated energy release increased rapidly,while the apparent stress sharply increased and then *** amount and proportion of shear and mixed MS events remarkably *** maximum displacement was generally located near the spandrel *** MS monitoring data and numerical simulation were in good agreement,which can provide significant references for damage evaluation and disaster forecasting in high geostress underground powerhouse caverns.

关键词： high geostress underground powerhouse caverns microseismic monitoring discrete element modelling stability analysis

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In-site core disking phenomenon and break mechanism of hard marble:Investigation in 2400 m deep-buried underground laboratory

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Journal of Central South University 2020年第10期27卷 2959-2970页

作者： ZHONG Shan JIANG Quan LIU Chang LI Shao-jun QIN Wei-min ZHOU Ji-fang SUN Wen-liang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China College of Engineering Swansea UniversitySwansea SA18EPUK University of Chinese Acadamy of Science Beijing 100049China Yalong River Hydropower Development Company Ltd.Chengdu 610051China

The core-disk phenomenon has been observed generally in the drilling process under high-stress *** paper presents the in-situ experimental study of the coring-disking failure mechanism of marble in an underground cavens with 2400 m *** on the disk samples in several boreholes with different diameters,both macro-and micro-morphological characteristics of core-disks’break surface were analysis,using 3D optical scanning and electron microscope ***,the numerical back analysis was also used to simulate the drilling process for demonstrating the development of core *** in-situ experiment results showed that the failure types of core disking consisted of tensile break and shear break,i.e.,the shear break usually appears in the edge part of break surface,and tensile break appears in the central ***’s more,the ration of core-disks thickness to borehole diameter is in a relatively stable *** back analysis indicated this micro asynchronous break of hard marble is induced by high geostress and unloading drill.

关键词： rock mechanics deep engineering shear break tensile break high geostress

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Time-dependent squeezing deformation mechanism of tunnels in layered soft-rock stratum under high geo-stress

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Journal of Mountain Science 2021年第5期18卷 1371-1390页

作者： CHEN Zi-quan HE Chuan WANG Jun MA Chun-chi Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Sichuan highway Planning Survey Design and Research Institute Ltd Chengdu 610041China Key Laboratory of Engineering Structures of Heavy Haul Railway Ministry of EducationCentral South UniversityChangsha 410075China

Large squeezing deformation of layered soft rock tunnel under high geo-stress has a significant time-dependent deformation *** this paper,we studied the deformation mechanism during the construction period of deep-buried softrock tunnel by means of a combination of field observations and a numerical ***,a new classification criterion for large deformations based on the power exponent variation law between the deformation and the strength-stress ratio is ***,the initial damage tensor reflecting the bedding plane(joint)distribution and an equivalent damage evolution equation derived from the viscoplastic strain are introduced based on the geometric research method,i.e.,a new rheological damage model(RDL model)of layered soft rock is established consisting of elastic,viscous,viscoelastic,viscoplastic and plastic elements.A field test was conducted on the Maoxian tunnel in Sichuan province,southwestern China,which is in broken phyllite(layered soft rock)under high *** tunnel has experienced large deformation due to serious squeezing pressure,thus we adopted double primary support method to overcome the supporting structure failure *** rheological parameters of phyllite in the Maoxian tunnel were recognized by using SA-PSO optimization,and the RDL model does a good job in describing the time-dependent deformation behavior of a layered soft-rock tunnel under high ***,the RDL model was used to investigate the supporting effect and bearing mechanism of the double primary support *** with the single primary support method,the surrounding rock pressure,secondary lining force,surrounding rock deformation,and the depth of the damage to the rock mass was reduced by 40%-60%after the double primary support method was used.

关键词： Deformation mechanism Layered soft rock tunnel high geostress Large squeezing deformation Rheological damage model

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