Piezoelectric characteristics of coal rock leakage under uniaxial compression by Zeyi Liu, Ke Gao, Yujiao Liu, Chengyao Zhu, Yao Zhang

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Numerical Modeling and Stability Analysis of Surrounding Rock of Yuanjue Cave by Zhigang Meng, Fangzheng Fan, Xuebin Cui, Shu Tao, Yi Cao

“…Yuanjue Cave, located in Big Buddha Bay, Mount Baoding, Dazu Rock Carvings Area, has extremely high historical, artistic, and religious value and is an important grotto cultural relic in China. …”
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Optimal Nozzle Structure for an Abrasive Gas Jet for Rock Breakage by Yong Liu, Juan Zhang, Tao Zhang, Huidong Zhang

“…Improving the efficiency of rock breakage using abrasive gas jets is an essential precondition for future coal-bed methane exploration. …”
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The Analytical Approach to Evaluate the Load-Displacement Relationship of Rock Bolts by Jianhang Chen, Shengli Yang, Hongbao Zhao, Junwen Zhang, Fulian He, Shuaifeng Yin

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The Relationship between Climbing Ability and Physiological Responses to Rock Climbing by Jiří Baláš, Michaela Panáčková, Barbora Strejcová, Andrew J. Martin, Darryl J. Cochrane, Miloš Kaláb, Jan Kodejška, Nick Draper

“…Mean oxygen consumption and heart rate (HR) increased with wall inclination and climbers reached a mean (±SD) peak V˙O2 of 40.3 ± 3.5 mL·kg−1·min−1 during the maximal test. …”
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Prediction Model of Drilling Performance for Percussive Rock Drilling Tool by Dae-Ji Kim, Jaewon Kim, Booyeong Lee, Min-Seok Shin, Joo-Young Oh, Jung-Woo Cho, Changheon Song

“…This study suggests a method for quantitatively estimating the drilling performance of the down-the-hole (DTH) hammer during percussive drilling of rock surfaces. …”
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Experimental study on pressure relief blasting in rock-blast tunnel by ZhenLin Chen, Wenjing Cai, Meng Wei, Cassandra J. Rutherford, Xiao Zhu, Zelin Wang, Tao Su

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Study on the Rock Size Effect of Quasistatic and Dynamic Compression Characteristics by Jun Zhou, Xiangrui Meng, Chongyan Liu, Zhixi Liu, Wensong Xu, Xiang Cheng

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Side Friction of Rock-Socketed Piles Involving Thick Sediment by Tie Hang Wang, Liang Zhang, Yan Zhou Hao, Xin Jin

“…Due to the thick layer of sediment, the axial force of the rock-socketed segment of the pile gradually decreases along the vertical direction from the applied load on the pile top to zero at the bottom. …”
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Influence of Stress Sensitivity on Water-Gas Flow in Carbonate Rocks by Shuaishi Fu, Lianjin Zhang, Yingwen Li, Xuemei Lan, Roohollah Askari, Junjie Wang, Wen Wen, Xinze Li, Shaobin Cai, Ke Wang, Jie Liu, Yushu Wang, Yongfei Yang

“…Therefore, the irreversible closure of pores leads to the decrease of permeability and the increase of gas-phase seepage resistance, especially in carbonate rocks with fractures, vugs, and large pores. The findings of this study are helpful to better understand the gas production law of depletion development of carbonate gas reservoirs and provide support for efficient development.…”
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Damage of Green Synthetic Cement Slurry to Clastic Rock Reservoir by Meng Xu, Xin Tan, Libo Yang, Hanlie Cheng, David Cofell

“…The research results show that the average porosity of the clastic rock reservoir in the study area is 15%, the permeability is high, the average pore size of the reservoir is between 37 and 56 μm, the microfractures are developed in the reservoir section, and the porosity and permeability conditions are good; high-valent cations and inorganic ions in the filtrate generate inorganic scales such as CaCO3 and Mg(OH)2 and cross-link with dissolved polymers to form flocculation substances, which cause the filtrate to damage the reservoir, and at the same time, the cement particles in the pore throats in the near wellbore zone are lost along with the leakage. …”
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Experimental study on mechanical properties of S-RM with different rock block proportions in fault zone by Peng-fei Wang, Xue-yang Xing, Yong-cheng Jin, Jian-biao Bai, Chang-hong Li

“…During the process of increasing the RBP from 20 to 80%, the cohesion increases from 83.12 kPa to 119.38 kPa, and the friction angle increases from 6° to 11°. (4) When the RBP is low (20% and 40%), as the experiment progresses, a significant conjugate shear deformation zone will form within the S-RM sample, and block rock particles will migrate towards this area and undergo shear slip failure between particles. …”
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Study on the Constant Resistance Coupling Support Technology for Rock Column at the Intersection Point of Deep Soft Rock Large Section Roadway: A Case Study in China by Huichen Xu, Yong Zhang, Jinkun Yang, Jiangbing Li, Xiaoming Sun, Cheng Xie

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Ronnie Von: de ídolo da juventude a artista psicodélico (1966-1970) by Marcelo Garson, Herom Vargas

Subjects: “…Ronnie Von…”
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Effects of Rainfall Intensity and Vegetation Cover on Erosion Characteristics of a Soil Containing Rock Fragments Slope by Bingqin Zhao, Lun Zhang, Zhenyao Xia, Wennian Xu, Lu Xia, Yongzhe Liang, Dong Xia

“…Rainfall events coupled with shallow and gravelly sloping farmland have led to serious soil erosion and associated problems in the Three Gorges reservoir. Previous studies have shown that the use of vegetation is an effective way to control soil erosion. …”
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Influence of Moisture Content on the Structural Characteristics of Argillaceous Weakly Consolidated Rock Caused by Dynamic Loading in the Coal Mine by Lingdong Meng, Lijun Han, Hexuan Zhu, Wenlong Dong, Wei Li

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Short Cantilever Rock Beam Structure and Mechanism of Gob-Side Entry Retaining Roof in Reuse Period by Jingke Wu, Yun Dong, Jiarui Chen, Chunlei Zhang, Wei Yin, JiHua Zhang, Yongzhen Cheng

“…A dynamic-equilibrium mechanical model of the main roof structure is presented and the formation mechanisms of different types of short cantilever rock beam structures are clarified. The following major conclusions are drawn: (1) Three types of short cantilever rock beam structures occur in the main roof of a gob-side entry retaining during the reuse period, namely, the “short cantilever-articulated rock beam” structure, “short cantilever step rock beam (type I)” structure, and “short cantilever step rock beam (type II)” structure. (2) The stability criterion for these three short cantilever rock beam structures was also determined; that is, when the sliding instability coefficient K ≥ 1, the short cantilever-articulated rock beam structure will form, and when the sliding instability coefficient K < 1, the short cantilever step rock beam (type I or II) will form. (3) The governing law for the thicknesses of the main roof, immediate roof, and coal seam of the short cantilever rock beam structure was clarified; namely, the K-value gradually increases with increases in the thickness of the coal seam, drops sharply and then decreases gradually with increases in the thickness of the main roof, and decreases slowly with increases in the thickness of the immediate roof. …”
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Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses by Qian Dong, XinPing Li, JunHong Huang

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Study of Rock Burst Risk Evolution in Front of Deep Longwall Panel Based on Passive Seismic Velocity Tomography by Kunyou Zhou, Linming Dou, Siyuan Gong, Jiazhuo Li, Jinkui Zhang, Jinrong Cao

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Corrigendum to “Numerical Simulation Modeling of Carbonate Reservoir Based on Rock Type” by Peiqing Lian, Cuiyu Ma, Bingyu Ji, Taizhong Duan, Xuequn Tan

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