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Effect of height-diameter ratio on the mechanical characteristics of shale with different bedding orientations

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2482-2502页

作者： Yide Guo xibing li linqi Huang School of Resources and Safety Engineering Central South UniversityChangsha410083China

Geological exploration cores obtained from shale gas wells several kilometers deep often show different height-diameter ratios(H/D)because of complex geological conditions(core disking or developed fractures),which makes further standard specimen preparation for mechanical evaluation of reservoirs *** multi-cluster hydraulic fracturing,shale reservoirs between planes of hydraulic fractures with different lengths could be simplified to have different H/D *** the effect of H/D on the mechanical characteristics of shale specimens with different bedding orientations will support mechanical evaluation tests of reservoirs based on disked geological cores and help to optimize multicluster fracturing *** this study,we performed uniaxial compression tests and acoustic emission(AE)monitoring on cylindrical Longmaxi shale specimens under five bedding orientations and four H/D *** experimental results showed that both the H/D-dependent mechanical properties and AE parameters demonstrated significant *** H/D did not change the uniaxial compressive strength(UCS)evolution versus bedding orientation,demonstrating a V-shaped relationship,but enhanced the curve *** stress level of crack damage for the specimens significantly increased with increasing H/D,excluding the specimens with a bedding orientation of 0°.With increasing H/D,the cumulative AE counts of the specimens with each bedding orientation tended to exhibit a stepped jump against the loading *** proportion of low-average-frequency AE signals(below 100 kHz)in specimens with bedding orientations of 45°and 60°increased to over 70%by increasing H/D,but it only increased to 40%in specimens with bedding orientations of 0°,30°,and 90°.Finally,an empirical model that can reveal the effect of H/D on anisotropic UCS of shale reservoir was proposed,the anisotropic proportion of tensile and shear failure cracks in specimens under four H/D ratios was classified based o

关键词： Geological cores Multi-cluster hydraulic fracturing Height-diameter ratio Longmaxi shale Uniaxial compression test

STRESS AND ENERGY TRANSFER OF WATER COUPliNG BLASTING

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中国有色金属学会会刊：英文版 1998年第2期8卷 167-173页

作者： Zhang, Qiang li, xibing Zhu, Fangcai Chen, Shouru Beijing General Research Inst of Mining & Metallurgy Beijing China

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ＳＴＲＥＳＳＡＮＤＥＮＥＲＧＹＴＲＡＮＳＦＥＲＯＦＷＡＴＥＲＣＯＵＰＬＩＮＧＢＬＡＳＴＩＮＧ①ＺｈａｎｇＱｉａｎｇＢｅｉｊｉｎｇＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅｏｆＭｉｎｉｎｇ＆Ｍｅｔａｌｕｒｇｙ，Ｂｅｉｊｉｎｇ１０００４４，Ｐ．Ｒ．...

关键词： water coupling blasting equivalent wave impedance method match of explosive and rock fragmentation experiment fracture law experiment

Rockburst prediction and prevention in underground space excavation

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Underground Space 2024年第1期14卷 70-98页

作者： Jian Zhou Yulin Zhang Chuanqi li Haini He xibing li School of Resources and Safety Engineering Central South UniversityChangsha 410083China Laboratory 3SR CNRS UMR 5521Grenoble Alpes UniversityGrenoble 38000France

The technical challenges associated with deep underground space activities have become increasingly *** these challenges,one major concern is the assessment of rockburst risks and the instability of rock *** research has been conducted by numerous scholars to mitigate the risks and prevent occurrences of rockburst through various assessment *** incidents commonly occur during the excavation of hard rock in underground environments,posing severe threats to personnel safety,equipment integrity,and operational ***,it is crucial to systematically document real cases of rockburst,allowing for a comprehensive understanding of the underlying mechanisms and triggering *** understanding will contribute to the advancement of rockburst prediction and prevention *** selection of an appropriate rockburst assessment method is a fundamental aspect in underground ***,there is a limited number of studies that summarize and compare different prediction and prevention methods of *** paper aims to address this gap by analyzing global trends using CiteSpace software since *** discusses rockburst classification and characteristics,comprehensively reviews research findings related to rockburst prediction,including empirical,simulation,mathematical modeling,and microseismic monitoring ***,the paper presents a compilation of current rockburst prevention ***,the paper emphasizes the significance of control strategies,which provide key insights into the effective utilization of stored energy within ***,the paper concludes by suggesting six directions for implementing intelligent management techniques to mitigate hazards during underground operations and reduce the probability of rockburst incidents.

关键词： Rockburst Underground space Scientometric analysis Characteristic analysis Rockburst prediction Rockburst prevention

Influence of maximum principal stress direction on the failure process and characteristics of D-shaped tunnels

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International Journal of Mining Science and Technology 2022年第5期32卷 1125-1143页

作者： linqi Huang Xuefeng Si xibing li Fengqiang Gong Yong Luo School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China School of Civil Engineering Southeast UniversityNanjing 211189China

To investigate the failure process and characteristics of D-shaped tunnels under different maximum principal stress directions θ, true-triaxial tests were conducted on cubic sandstone samples with a through D-shaped hole. The test results show that the failure process can be divided into 4 periods:calm, buckling deformation, gradual buckling and exfoliation of rock fragment, and formation of a Vshaped notch. With an increase in θ from 0° to 90°, the size of the rock fragments first decreases and then increases, whereas the fractal dimension of the rock fragments first increases and then decreases. Meanwhile, the failure position at the left side shifts from the sidewall to the corner and finally to the floor, whereas the failure position at the right side moves from the sidewall to the spandrel and finally to the roof, which is consistent with the failure position in underground engineering. In addition, the initial vertical failure stress first decreases and then increases. By comparing the results,the failure severities at different maximum principal stress directions can be ranked from high to low in the following order: 90°>60°>30°>45°>0°.

关键词： Deep D-shaped tunnel Rockburst Maximum principal stress direction True-triaxial test V-shaped notch

Numerical investigation on the tensile fracturing behavior of rock-shotcrete interface based on discrete element method

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International Journal of Mining Science and Technology 2020年第3期30卷 293-301页

作者： Jiadong Qiu lin Luo xibing li Diyuan li Ying Chen Yong Luo Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen 518060China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationCentral South UniversityChangsha 410083China School of Resources and Safety Engineering Central South UniversityChangsha 410083China Center of Rock Mechanics and Geohazards Shaoxing UniversityShaoxing 312000China

Four groups of numerical models of Brazilian tests on rock-shotcrete interfaces were successfully conducted by PFC2D. The tensile strength and Young’s modulus of shotcrete were considered. Six different undulations of rock-shotcrete interface were set up. The influences of multiple parameters on the bearing characteristics of the rock-shotcrete interface were studied. The results showed that a better support performance can be obtained by increasing the Young’s modulus of shotcrete rather than the tensile strength of shotcrete. For different tensile strength and Young’s modulus, the increase of sawtooth height has different effects on the support performance. The failure mechanism of the rock-shotcrete interfaces was analysed in detail. The stress shielding effect and stress concentration effect caused by the shape characteristics of rock-shotcrete interface were observed. The influence of these parameters on the overall support performance should be fully considered in a reasonable support design.

关键词： Tensile strength PFC Shotcrete Fracturing behavior Rock interface

REFLECTION AND REFRACTION OF STRESS WAVES AT A STRUCTURAL WEAKNESS PLANE IN ROCK MASS

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 11-18页

作者： li xibing Lai Haihui Gu Desheng Central South University of Technology Changsha 410083China

In the case or wave interactions with structural weakness planes in rook mass the results of reflection and refraction of waves at entirely cohesive boundaries have been used all ***,oblique incidences of compressive stress waves at the structural weakness plane may result in relative slippage of rocks on both sides of the *** authors have derived the reflection and refraction coefficients for plane stress waves generated by blasting incidents on the structural weakness plane in rook mass according to its special boundary *** formula of energy dissipation and some computational results at the structural weakness plane are *** the above basis,some problems about rook and soil engineering are discussed.

关键词： refraction entirely oblique

THREE DIMENSIONAL NUMERICAL SIMULATION OF EXCAVATION AND BACKFILliNG IN MINING ENGINEERING

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中国有色金属学会会刊：英文版 1999年第2期9卷 213-217页

作者： Gu, Desheng Deng, Jian li, xibing Zhang, Jiasheng Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｔｈｉｒｔｙｙｅａｒｓ，ｗｉｔｈｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｃｏｍｐｕｔｅｒｔｅｃｈｎｉｑｕｅ，ｉｔｂｅｃｏｍｅｓｐｏｓｉｂｌｅｔｏｓｉｍｕｌａｔｅｓｕｃｈｃｏｍｐｌｉ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｒｅｃｅｎｔｔｈｉｒｔｙｙｅａｒｓ，ｗｉｔｈｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｃｏｍｐｕｔｅｒｔｅｃｈｎｉｑｕｅ，ｉｔｂｅｃｏｍｅｓｐｏｓｉｂｌｅｔｏｓｉｍｕｌａｔｅｓｕｃｈｃｏｍｐｌｉｃａｔｅｄｐｒｏｃｅｓｅｓａｓｍｉ...

关键词： mining engineeringexcavationbackfillingnumerical simulation

IMITATING STUDY ON BLASTING EFFECT OF JOINTED ROCK MASSES

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Journal of Central South University 1998年第2期10卷 54-56页

作者： Qiyue li xibing li Shiyou Wen Fuguo Xiao 1. College of Resources Environment and Civil Engineering Central South University of Technology 410083 Changsha China 2. Shuikoushan Mine Bureau 421504 Changning

The blasting experiment of the cement mortar model reveals that joint inclination affects blasted rock size distribution, which is an important index to evaluate the blasting effect. According to the fractal theory, the relationship is built up between fractal dimension and mass fraction of blasted fragments screened, that is, y x=100(x/x m ) 3-D . On the basis of the experiment results, the fractal dimension describing fragment size distribution is calculated.

关键词： jointed rock masses experimental blasting fractal dimension

Stability analysis of underground mine hard rock pillars via combination of finite difference methods,neural networks,and Monte Carlo simulation techniques

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Underground Space 2021年第4期6卷 379-395页

作者： Chuanqi lia Jian Zhou Danial Jahed Armaghani xibing li School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Civil Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia

Pillar stability is always evaluated using the safety factor(SF),which is defined as the ratio of pillar strength to pillar ***,most researchers have estimated pillar stress using the pillar shape ratio(w/h),uniaxial compressive strength(UCS)of the intact rock mass,and pillar depth(H).In this study,the geological strength index(GSI)of hard rock pillars was considered as a new variable for predictive *** index was developed by combining numerical simulation software(i.e.,FLAC3D)and a backpropagation neural network(BPNN).A hard rock pillar stability analysis,based on three methods including deterministic method,sensitivity analysis,and Monte Carlo simulation(MCS),was performed.A new formula was proposed to estimate the SF values based on the predicted stress,considering the GSI variable in the deterministic *** sensitivity analysis indicated that the variables impacting the SF from high to low are UCS,GSI,w/h,and *** this study,pillar stability was analyzed mainly using the GSI and MCS *** MCS results revealed that the GSI is also a major factor in pillar stability and has a greater effect on weak pillars than on strong ***,a pillar is more likely to be unstable when both the GSI and the UCS are *** study provides several references and procedures for improving the design of stable pillars considering the GSI as an important factor.

关键词： Hard rock pillar Numerical simulation Neural networks Safety factor Geological strength index Monte Carlo simulation