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International Journal of Mining Science and Technology 2023年第5期33卷 625-637页

作者： Xiaodong Wu Min Gong Haojun Wu Guangfeng Hu Sijie Wang School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

Interlaid rock is an important component in the construction of neighborhood tunnels that supports and reinforces the area between two ***,the blasting load during excavation can sometimes damage the interlaid rock and threaten the stability of a tunnel’s *** paper presents a case study of the small clearance section of the Liantang highway tunnel project in Shenzhen,China,where the minimum distance between the two tunnels involved is only 0.5 *** reduce the damage to the interlaid rock caused by blasting loads,we proposed a four-part excavation method with a vibrationcushioning rock layer in the following tunnel of neighborhood *** simulation was used to model the damage prevention mechanism of the vibration-cushioning rock layer and to better understand the propagation of cracks in the interlaid ***,based on the simulation results,combined microseismic controlled-blasting technology was implemented,using innovative blasting patterns combined with different charge structures and blasting equipment designed according to the varying thickness of the interlaid ***,this implementation succeeded in protecting interlaid rock during blasting operations.

关键词： Neighborhood tunnels Interlaid rock rock damage Blasting design Ground vibration

Discussion on blasting vibration monitoring for rock damage control in rock slope excavation

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 53-65页

作者： Yang Jianhua Cai Jiyong Yao Chi Zhang Xiaobo Liu Liansheng School of Civil Engineering and Architecture Nanchang UniversityNanchang 30031China School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Drill and blast is a commonly used method for rock slope excavation in hydropower *** blasting excavation of rock slopes,far-field vibration monitoring on the first upper berm for statutory compliance is usually performed to control the blast-induced rock damage to the final slope *** this study,for the rock slope excavation in the Jinping-I hydropower station,the field vibration monitoring and acoustic testing are presented to investigate the vibration characteristics on the first upper berm and the damage depth in the current *** relationship between the PPV on the first upper berm and the PPV damage threshold on the damage zone boundary is also studied through three-dimensional FEM *** results show that on the first upper berm,the maximum vibration velocity component occurs in the vertical *** on the blasting damage zone boundary,the horizontal radial vibration velocity is the maximum *** the Jinping-I slope with a bench height of 30 m,the radial PPV on the inner side of the first upper berm is 2.06%of the PPV threshold on the damage zone *** ratio is increased as the bench height ***,the bench height of the rock slope is an important factor that cannot be ignored in determining the allowable vibration velocity for rock damage control.

关键词： rock slope blasting excavation vibration rock damage

Evaluation method of rock damage under uniaxial compression based on unit series-parallel electrical conductive model

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Rock Mechanics Bulletin

rock Mechanics Bulletin 2023年第4期2卷 18-26页

作者： Ganglie Yuan Ailan Che Youzhi Shi Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University800 Dongchuan-RoadShanghai200240China School of Civil Engineering and Architecture Xiamen University of TechnologyXiamen361024China

The evaluation of rock damage behaviour is an important requirement for ensuring stability control and safety prediction in rock ***,they have not been able to obtain sufficiently accurate and dynamic results due to the insufficient evaluation *** this study,by means of fractals and unit series division,a unit series-parallel conductive model of damaged rock is derived,and a new evaluation method of rock damage under uniaxial compression was *** was damaged by uniaxial compression,while electrical measurements and X-ray microscopy tests were performed to obtain the damaged rock resistivity,porosity,and fractal dimension *** establishing the relationship between defined meso-damage factor and resistivity,rock damage evolution law under axial compression was *** results indicate that the growth trend was agree with the classical statistical damage model,which verified the accuracy of the results obtained by the proposed ***,as the strain increased,the damage factor determined by resistivity gradually decreased to0.06 firstly and then increased rapidly to *** from previous damage evolution law,brittle failure was observed and the cracks development in each stage was considered,including the closure(negative damage)and expansion(positive damage)of cracks.

关键词： rock damage Uniaxial compression Unit series-parallel Electrical resistivity measurement

Effects of loading waveforms on rock damage using particle simulation method

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Journal of Central South University 2018年第7期25卷 1755-1765页

作者： XIA Ming GONG Feng-qiang Hunan Key Laboratory of Geomechanics and Engineering Safety Xiangtan UniversityXiangtan 411105China College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan 411105China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

The particle simulation method is used to study the effects of loading waveforms （i.e. square, sinusoidal and triangle waveforms） on rock damage at mesoscopic scale. Then some influencing factors on rock damage at the mesoscopic scale, such as loading frequency, stress amplitude, mean stress, confining pressure and loading sequence, are also investigated with sinusoidal waveform in detail. The related numerical results have demonstrated that： 1） the loading waveform has a certain effect on rock failure processes. The square waveform has the most damage within these waveforms, while the triangle waveform has less damage than sinusoidal waveform. In each cycle, the number of microscopic cracks increases in the loading stage, while it keeps nearly constant in the unloading stage. 2） The loading frequency, stress amplitude, mean stress, confining pressure and loading sequence have considerable effects on rock damage subjected to cyclic loading. The higher the loading frequency, stress amplitude and mean stress, the greater the damage the rock accumulated; in contrast, the lower the confining pressure, the greater the damage the rock has accumulated. 3） There is a threshold value of mean stress and stress amplitude, below which no further damage accumulated after the first few cycle loadings. 4） The high-to-low loading sequence has more damage than the low-to-high loading sequence, suggesting that the rock damage is loading-path dependent.

关键词： rock damage failure process crack initiation and propagation loading waveform cycle loading particle simulation method

damage of reservoir rock induced by CO_(2) injection

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Petroleum Science 2022年第4期19卷 1674-1681页

作者： Jing Li Zhao-Yang Chen Yong-Cun Feng Li-Sha Qu Jia-Geng Liu Wen-Yan Li Meng-Ying Dai College of Pipeline and Civil Engineering China University of PetroleumQingdao266580ShandongChina College of Petroleum Engineering China University of PetroleumBeijing102249China School of Geosciences China University of PetroleumQingdao266580ShandongChina Research Institute of Exploration and Development PetroChina Tarim Oilfield CompanyKorla841000XinjiangChina

The study of reservoir rock damage induced by gas injection is of great significance to the design of reservoir stimulation and the improvement of oil and gas recovery. Based on an example horizontal well in the Hudson Oilfield of the Tarim Basin and considering the multi-physics coupling effects among highpressure fluid, rock deformation, and damage propagation during CO_(2) injection, a three-dimensional finite element model for CO_(2) injection in deep reservoir considering seepage-stress-damage coupling was developed. The evolution of reservoir rock damage under different CO_(2) injection conditions was systematically investigated. The results show that tensile damage and shear damage are concentrated in the vertical direction and the horizontal maximum compressive principal stress direction, respectively,and the tensile damage is the main damage mode. At higher CO_(2) injection rate and pressure, the damaged areas near the wellbore are mainly distributed in the direction of the maximum compressive principal stress, and the development of the damaged area near the wellbore will be inhibited by the formation and evolution of far-field damage. CO_(2) injection aggravates the extension of tensile damage,but inhibits the initiation of shear damage, and eventually leads to the gradual transition from shear damage to tensile damage. Under the same injection conditions, CO_(2) injection has superior performance in creating rock damage compared with the injection of nitrogen and water. The results in this study provide guidance for enhanced oil recovery in deep oil and gas reservoirs with CO_(2) injection.

关键词： CO_(2)injection Seepage-stress-damage coupling rock damage Numerical simulation

Simulation experiment of AE-based localization damage and deformation characteristic on covering rock in mined-out area

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 255-260页

作者： Sheng-jun Miao Xing-ping Lai Xing-guang Zhao Fen-hua Ren School of Civil ＆ Environmental Engineering University of Science and Technology Beijing Beijing 100083 China School of Energy Engineering Xi＇an University of Science and Technology Xi＇an 710054 China

The localization damage and deformation characteristics of multiple rock in mined-out area under thick soil layer were investigated by acoustic emission （AE）-based physical similar simulation experiment and damage test combined with the AE theory on rock damage. During different mining courses, the degree of wall rock suffered from mining disturbed process in mined-out area was different, so did the AE density of initial damage and fracture. Some characteristic parameters, including large events, total events, and energy rate, presented fluctuations with temporal and spatial change and take on a certain extent statistic relation. Subsequently, the percent of damage degree was defined and divided into 4 stages, and the localization damage and deformation characteristics of surrounding rock in mined-out area and coal pillars were analyzed quantitatively.

关键词： acoustic emission soil layer underground mine rock damage in-site monitoring

A 3D microseismic data-driven damage model for jointed rock mass under hydro-mechanical coupling conditions and its application

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Journal of rock Mechanics and Geotechnical Engineering 2023年第4期15卷 911-925页

作者： Jingren Zhou Jinfu Lou Jiong Wei Feng Dai Jiankang Chen Minsi Zhang State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resources and HydropowerSichuan UniversityChengdu610065China CCTEG Coal Mining Research Institute Beijing100013China State Key Laboratory of Coal Mining and Clean Utilization China Coal Research InstituteBeijing100013China Department of Engineering Mechanics Tsinghua UniversityBeijing100084China School of Civil and Architecture Engineering East China University of TechnologyNanchang330013China

rock mass is a fractured porous medium usually subjected to complex geostress and fluid pressure ***,the properties of rock mass change in time and space due to mining-induced ***,it is always challenging to accurately measure rock mass *** this study,a three-dimensional(3D)microseismic(MS)data-driven damage model for jointed rock mass under hydro-mechanical coupling conditions is *** is a 3D finite element model that takes seepage,damage and stress field effects into account *** factors(***,water and microseismicity)are used to optimize the rock mass mechanical parameters at different *** model is applied in Shirengou iron mine to study the damage evolution of rock mass and assess the crown pillar stability during the transition from open-pit to underground *** is found that the damage pattern is mostly controlled by the structure,water and rock mass *** damage pattern is evidently different from the two-dimensional result and is more consistent with the field *** difference is caused by the MS-derived damage acting on the rock *** data are responsible for gradually correcting the damage zone,changing the direction in which it expands,and promoting it to evolve close to *** the crown pillar,the proposed model yields a more trustworthy safety *** order to guarantee the stability of the pillar,it is suggested to take waterproof and reinforcement measures in areas with a high degree of damage.

关键词： Microseismic monitoring Numerical simulation rock damage Jointed rock mass Hydro-mechanical coupling

Analysis on damage and rheological characteristics of deep surrounding rock of shaft engineering

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Journal of Coal Science & Engineering(China) 2010年第1期16卷 29-34页

作者： YU Wei-jian ZHANG Yan School of Energy and Safety Engineering Hunan University of Science and Technology Xiangtan 411201 China Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science and Technology Xiangtan 411201 China School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China

According to the characteristics of deep engineering surrounding rock main shaft of No.3 mining district in Jinchuan, electron microscope scanning and rock mechanics test were adopted to analyze the damage features of rock. The software of FLAG3D and Burgers body （Kelvin-Maxwell model） were used to research on rheological theory, and rheological model was modified. The results indicate that the damage of rock mass is very serious, and the rheological characteristics also outstanding; rheological behavior of deep surrounding rocks of the shaft can be taken as superposition of transient and stable rheology; and there exist the most dangerous zone on 100 m higher than 1 063 m level, so it is necessity that works of monitor and corresponding reinforcement should strengthen.

关键词： shaft engineering deep surrounding rock rock damage rheological characteristics

The Study of Statistical damage Constitutive Models of rock and Its Parameters Based on Lade-Duncan Criterion

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Journal of Groundwater Science and Engineering 2013年第2期1卷 74-79页

作者： Lin Huan Liu Jie Tianjin University Institute of technology

Based on damage mechanics theory,a rock statistical damage constitutive model is established based on Lade-Duncan criterion assuming that the rock damage variable follows either a power function distribution or normal *** parameters m and F0 of two version of the models were studied using variety of calculation *** two models are compared with experimental results to explore models’ applicability.

关键词： Lade-Duncan failure criterion rock damage Stress-strain curve Power function distribution Normal distribution

STUDY ON THE damage CONSTITUTIVE RELATION OF rock UNDER UNIAXIAL STRESS CONDITION

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Journal of Coal Science & Engineering(China) 1999年第2期5卷 25-28页

作者：杨更社

The damage propagation constitutive relation of rock under uniaxial stress condition is studied by CT scanning in this paper. damage variables of rock are calculated using CT scanning method and Lemaitre’s equivalent... 详细信息

关键词： rock damage constitutive relation CT scanning