Experimental and Numerical Investigation of Hard Rock Breakage by Indenter Impact by Hongxiang Jiang, Zhiyuan Cai, Ouguo Wang, Deguang Meng

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Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet by Yohan Cha, Tae-Min Oh, Gye-Chun Cho

“…In this study, the effects of the focus geometry on the optimum abrasive flow rate (AFR) and momentum transfer characteristics in hard rock cutting were investigated. Experiments were conducted using granite specimens to test the AFR under different focus geometry conditions such as diameter and length. …”
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Performance Evaluation of Hard Rock TBMs considering Operational and Rock Conditions by Xiaoyang Zou, Hui Zheng, Yongzhen Mi

“…This paper focuses on studying the correlations of the performance of hard rock tunnel boring machines (TBMs) with operational and rock conditions. …”
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Experimental Study of Bilinear Initiating System Based on Hard Rock Pile Blasting by Yusong Miao, Xiaojie Li, HongHao Yan, Xiaohong Wang, Junpeng Sun

“…It is difficult to use industrial explosives to excavate hard rock and achieve suitable blasting effect due to the low energy utilization rate resulting in large rocks and short blasting footage. …”
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Flow Field Simulation of Swirling Abrasive Jet Nozzle for Hard Rock Breaking by Zhang Dongqing, Li Jingbin, Hu Xiao, Liu Xin, Cheng Kang

“…Radial jet drilling (RJD) technology has been proved to be an economical and efficient stimulation technology for oil and gas, geothermal, hydrate, etc. but conventional RJD technology adopts pure water jet to break rock and form laterals, which has low rock breaking efficiency and is unable to effectively break hard rock such as shale. Swirling abrasive jet is proposed to promote the development of RJD. …”
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Experimental and Theoretical Investigations of Hard Rocks at High Temperature: Applications in Civil Engineering by Mambou Ngueyep Luc Leroy, Foguieng Wembe Marius, Ngapgue François

“…This work shows that hard rock mechanical and physical properties evolutions are strongly related to the evolution of the microstructure caused by the geological history, cracks nucleation occurrences, recrystallization, dehydroxylation, and dehydration reactions. …”
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Rock-Breaking Laws of Disc Cutters with Different Height Differences in Hard Rock Strata by Zelin Lu, Xuchun Wang, Hongwei Teng, Xiaoming Guan, Chen Song, Gang Fan

“…When shield machine traverses through hard rock mass, disc cutters will be abraded to different degrees. …”
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Study on Mechanical Response and Stability Algorithm of Soft and Hard Rock Interbedded Slope Excavation by Qingyang Ren, Xin Meng

“…The verification shows that the composite sliding surface algorithm objectively reflects the destruction of the slope by bedding sliding and can reasonably evaluate the safety of soft and hard rock interbedded slope.…”
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Hard rock aquifer architecture and water circulation levels in the Strengbach critical zone observatory (France) by Chabaux, François, Négrel, Philippe, Gal, Frederick, Viville, Daniel, Ranchoux, Coralie, Van der Woerd, Jérome, Delay, Frederick, Ackerer, Julien, Aquilina, Luc, Diraison, Marc, Masson, Frédéric, Mériaux, Anne-Sophie, Labasque, Thierry, Lucas, Yann, Pezard, Philippe Adrien, Reuschlé, Thierry, Schmitt, Anne-Désirée, Stille, Peter, Wyns, Robert, Lerouge, Catherine, Dezayes, Chrystel

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A Scientometric Review on Rockburst in Hard Rock: Two Decades of Review from 2000 to 2019 by Weizhang Liang, Bing Dai, Guoyan Zhao, Hao Wu

“…This study is aimed at providing a scientometric review on rockburst research in hard rock from 2000 to 2019. First, a total of 430 papers were collected from the Web of Science Core Collection database. …”
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Theoretical Calculation Method for the Hugoniot Elastic Limit of Hard Rock Based on Ideal Elastoplastic Model by Yihao Cheng, Chunming Song, Yizhong Tan, Songlin Yue, Gan Li, Yanyu Qiu, Tianhan Xu, Yong Liu, Fei Gao, Qian Yu

“…To study the theoretical calculation method of the HEL for hard rock, the major factors determining the strength of rock under dynamic loadings are firstly discussed. …”
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Experimental Study on the Influence Mechanism of the Structural Plane to Rockbursts in Deeply Buried Hard Rock Tunnels by Guangtan Cheng, Jian Zhang, Qiang Gao, Chuanxiao Liu

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Experimental Research on Brittleness and Rockburst Proneness of Three Kinds of Hard Rocks under Uniaxial Compression by Rongchao Xu, Yiding Jin, Yumin Zhang

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Damage Evaluation for Rock Burst Proneness of Deep Hard Rock under Triaxial Cyclic Loading by Shuang You, Hongguang Ji, Zijian Zhang, Chenghan Zhang

“…High stress and strong excavation disturbance are the main causes of dynamic disasters, rock burst in deep hard rocks, and are more frequent and violent than those in shallow, which seriously restricts the deep mining. …”
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Calculation Method of Overburden Damage Height Based on Fracture Mechanics Analysis of Soft and Hard Rock Layers by Liang Chen, Shaowu Fan, Can Zhao, Lang Zhang, Zhiheng Cheng

“…Under the geological condition of soft and hard rock interaction stratum, the overburden damage height can provide a quantitative support for the design of the locations of gas drainage boreholes in the roof mining fracture zone and the determination of the hydraulic fracture zone in coal seam mining. …”
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Experimental Study of Size Effects on the Deformation Strength and Failure Characteristics of Hard Rocks under True Triaxial Compression by Qiang Han, Yaohui Gao, Yan Zhang

“…Finally, by analyzing the relationship between the size of the mineral grains or clusters in the two types of hard rocks and the complexity of crack propagation in the fracture surface under TTC, it is suggested that the minimum side length of rock samples should not be less than 10 times the maximum mineral clusters (such as feldspar phenocrysts in BHT basalt). …”
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Mechanism and Prevention and Control of Mine Earthquake in Thick and Hard Rock Strata considering the Horizontal Stress Evolution of Stope by Ming Zhang, Xuelong Hu, Hongtao Huang, Guangyao Chen, Shan Gao, Chao Liu, Lihua Tian

“…This study investigated the mechanism, prevention measures, and control methods for earthquake disasters typically occurring in mines with thick and hard rock strata. A mine stope with large faults and thick hard rock strata in Hebei Province was taken as the background study object. …”
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Prediction Method for the Ground Vibration Damage Boundary of Thick and Hard Rock Layer Fracture Type Mine Quakes by Ming Zhang, Xuelong Hu, Min Tu, Yong Yue, Qingwei Bu

“…The proposed prediction method considers the “instantaneous” motion characteristics of mining thick and hard rock layer and the dynamic load effect of “mine quakes.” …”
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Study on Blasting Characteristics of Soft-Hard Rock Strata Based on Energy Fields and Particle Expansion Loading Algorithm by Jianbin Cui, Liangfu Xie, Yongjun Qin, Xuejun Liu, Wei Qiao, Zeyu Hu, Liming Wu, Liewang Qiu, Ke Huang

“…Results show that (i) the distance between the interface of soft-hard rock and the blasthole seriously affects the blasting effect. …”
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Experimental Analysis of Deformation Mechanics and Stability of a Shallow-Buried Large-Span Hard Rock Metro Station by Wei Li, Jiwen Bai, Kexian Li, Shijie Zhang

“…Based on a certain Qingdao metro station, a large-scale three-dimensional model test has been carried out to investigate the stability of the surrounding rock masses (hard rock) and a large-span metro station under different excavation methods and technologies. …”
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