A failure criterion for shale considering the anisotropy and hydration based on the shear slide failure model

Qiangui Zhang ¹Bowei Yao ²Xiangyu Fan ³Yong Li ⁴Nicholas Fantuzzi ⁵Tianshou Ma ⁶Yufei Chen ⁷Feitao Zeng ⁸Xing Li ⁹Lizhi Wang²

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作者信息

1. Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China;Department of Civil,Geological and Mining Engineering,École Polytechnique de Montréal,Montreal H3T 1J4,Canada;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China
2. Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China
3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China
4. State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400030,China
5. Department of Civil,Chemical,Environmental and Materials Engineering,University of Bologna,Bologna 40136,Italy
6. Petroleum Engineering School,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China
7. School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China
8. Department of Civil,Geological and Mining Engineering,École Polytechnique de Montréal,Montreal H3T 1J4,Canada
9. Department of Civil and Mineral Engineering,University of Toronto,Toronto M5S 1A4,Canada
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Abstract

A failure criterion fully considering the anisotropy and hydration of shale is essential for shale formation stability evaluation. Thus, a novel failure criterion for hydration shale is developed by using Jaeger's shear failure criterion to describe the anisotropy and using the shear strength reduction caused by clay miner-als hydration to evaluate the hydration. This failure criterion is defined with four parameters in Jaeger's shear failure criterion (S1, S2, a and u), three hydration parameters (k, xsh and rs) and two material size parameters (d and l0). The physical meanings and determining procedures of these parameters are described. The accuracy and applicability of this failure criterion are examined using the published exper-imental data, showing a cohesive agreement between the predicted values and the testing results, R2=0.916 and AAREP (average absolute relative error percentage) of 9.260％. The error (|Dp|) is then dis-cussed considering the effects of b (angle between bedding plane versus axial loading), moisture content and confining pressure, presenting that |Dp| increases when b is closer to 30?, and |Dp| decreases with decreasing moisture content and with increasing confining pressure. Moreover, |Dp|is demonstrated as being sensitive to S1 and being steady with decrease in the data set when b is 0?, 30?, 45? and 90?.

Key words

Shale/Failure criterion/Mechanical strength/Shear slide failure/Anisotropy/Hydration

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基金项目

Sichuan Science and Technology Program(2022NSFSC0185)

National Natural Science Foundation of China(42172313)

National Natural Science Foundation of China(51774246)

Natural Science Foundation of Chongqing(cstc2020jcyjmsxmX0570)

Fundamental Research Funds for the Central Universities(2020CDJ-LHZZ-004)

Fundamental Research Funds for the Central Universities(2020CDJQY-A046)

State Key Laboratory of Coal Mine Disaster Dynamics and Control(2011DA105287-MS201903)

scholarship supports provided by the China Scholarship Council(CSC)()

出版年

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

参考文献量9

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