Results 31 to 40 of about 3,618 (152)

Triaxial Compression Performance Research of Steel Slag Concrete on the Unified Strength Theory

Applied Sciences, 2020
To better explore the mechanical properties of steel slag concrete (SSC) under triaxial compression, true triaxial tests were performed on SSC with three replacement ratios (30%, 70%, 100%) by a servo-controlled setup (TAWZ-5000/3000).
Zhiheng Deng, Jingkai Zhou, Beiquan Chen, Xiaoyan Wen, Bing Liu   +4 more
doaj   +1 more source

Experimental Investigation on the Influence of Depth on Rockburst Characteristics in Circular Tunnels

Sensors, 2022
To investigate the influence of depth on the rockburst of surrounding rock in a circular tunnel, true-triaxial tests at different depths were carried out on cubic granite specimens with a circular through-going hole.
Xuefeng Si, Kang Peng, Song Luo
doaj   +1 more source

Advancing mine pillar design: Evaluating traditional methods and integrating AI for enhanced stability of pillars in the Great Dyke, Zimbabwe

Deep Underground Science and Engineering, EarlyView.
B1 is bord width 1, B2 is bord width 2, L is the pillar length, W is the pillar width, red color and letter A represent the pillars, and white color and number 1 represent excavated areas. Pstress is the average pillar stress; σv is the vertical component of the virgin stress, MPa; and e is the areal extraction ratio. e = B o B o + B P ${\rm{e}}=\frac{{
Tawanda Zvarivadza, Hendrik Grobler, Peter Apata Olubambi, Moshood Onifade, Manoj Khandelwal   +4 more
wiley   +1 more source

Mechanical parameter evolutions and deterioration constitutive model for ductile–brittle failure of surrounding rock in high-stress underground engineering

Underground Space
The deep surrounding rock is usually in the true triaxial stress state, and previous constitutive models based on the understanding of uniaxial and conventional triaxial test results have difficulty characterizing the degradation and fracture process of ...
Zhi Zheng, Ronghua Li, Qiang Zhang, Xiaohua Huang, Wei Wang, Shuling Huang   +5 more
doaj   +1 more source

Acoustic Emission b Value Characteristics of Granite under True Triaxial Stress

Mathematics, 2022
The acoustic emission b value is an important and widely used parameter for the early prediction of rock fractures. In this study, five groups of true triaxial compression tests were conducted on granite specimens to analyze changes in b value during the
Longjun Dong, Lingyun Zhang, Huini Liu, Kun Du, Xiling Liu   +4 more
doaj   +1 more source

Fracture evolution of a thick soft protection layer and the water inrush mechanism in overburden under longwall mining

Deep Underground Science and Engineering, EarlyView.
Through shear–tensile creep tests and viscoelastic modeling, the fracture evolution of thick soft protective layers is clarified. Results show thickness‐dependent rheological failure modes that govern four types of roof water inrush, providing a mechanism‐based framework for hazard prediction and control. Abstract In the Jurassic coal‐bearing strata of
Mengnan Liu, Wei Qiao, Xianggang Cheng, Xiangsheng Meng, Peichao Feng   +4 more
wiley   +1 more source

Energy evolution and damage analysis of true triaxial cyclic loading and unloading of sandstone at different rates

Meitan xuebao
To investigate the effects of different rates on the energy and damage evolution of sandstone during true triaxial cyclic loading and unloading damage, the true triaxial compression test, true triaxial primary loading and unloading test, and true ...
Qihang ZHANG, Xiangrui MENG, Guangming ZHAO, Wensong XU, Chongyan LIU, Zhixi LIU, Xukun WU, Minjie QI   +7 more
doaj   +1 more source

Experimental Study of Strain Rockburst considering Temperature Effect: Status-of-the-Art and Prospect

Shock and Vibration, 2021
In deep mining and excavation of tunnels with high geothermal, the surrounding rock is not only subjected to high ground stress but also subjected to high temperature.
Lei Xu, Fengqiang Gong
doaj   +1 more source

Experimental study on rockburst fragment characteristic of granite under different loading rates in true triaxial condition

Frontiers in Earth Science, 2022
In order to study the effect of loading rate on rockburst, an indoor test of single-face fast unloading-three directions and five-face stress-vertical continuous loading is conducted under different loading rates using a new true-triaxial rockburst test ...
Feiyue Sun, Jiaqi Guo, Junqi Fan, Xiliang Liu   +3 more
doaj   +1 more source

Rock mechanical properties under reconstructed deep in situ thermo–hydro–mechanical conditions: Implications for CO₂‐related injection scenarios

Deep Underground Science and Engineering, EarlyView.
The graphical abstract illustrates a reconstructed in situ thermo‐hydro‐mechanical (THM) framework in which porosity serves as the central variable linking stress, pore pressure, and temperature to evolving mechanical properties of rocks. Under burial conditions, in situ stress, pore pressure, and temperature jointly govern volumetric strain and ...
Mingyuan Lu, Jun Wang, Zixiong Qi, Ruixuan Chen, Hongtao Wang, Hongwei Zhou   +5 more
wiley   +1 more source