首页|Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process

Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process

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The quantitative determination and evaluation of rock brittleness are crucial for the estimation of exca-vation efficiency and the improvement of hydraulic fracturing efficiency. Therefore, a'three-stage"triax-ial loading and unloading stress path is designed and proposed. Subsequently, six brittleness indices are selected. In addition, the evolution characteristics of the six brittleness indices selected are characterized based on the bedding effect and the effect of confining pressure. Then, the entropy weight method (EWM) is introduced to assign weight to the six brittleness indices, and the comprehensive brittleness index Bc is defined and evaluated. Next, the new brittleness classification standard is determined, and the brittleness differences between the two stress paths are quantified. Finally, compared with the previous evaluation methods, the rationality of the proposed comprehensive brittleness index Bc is also verified. These results indicate that the proposed brittleness index Bc can reflect the brittle characteristics of deep bedded sand-stone from the perspective of the whole life-cycle evolution process. Accordingly, the method proposed seems to offer reliable evaluations of the brittleness of deep bedded sandstone in deep engineering prac-tices, although further validation is necessary.

BrittlenessDeep bedded sandstoneWhole life-cycle evolution processBedding effectEffect of confining pressureEntropy weight method

Zhixiang Song、Junwen Zhang、Yang Zhang、Xukai Dong、Shanyong Wang

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School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

Priority Research Centre for Geotechnical Science&Engineering,The University of Newcastle,Callaghan NSW 2308,Australia

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYue Qi Distinguished Scholar Project

52034009519743192020JCB01

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(4)
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