Study of the fracture process in heterogeneous materials around boreholes filled with expansion cement

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:112

Article

Tang, S. B.^1,2  Huang, R. Q.²  Wang, S. Y.³  Bao, C. Y.⁴  Tang, C. A.¹ 

[1] Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116024, Peoples R China

[2] Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Peoples R China

[3] Univ Newcastle Callaghan, ARC Ctr Excellence Geotech Sci & Engn Civil Surve, Callaghan, NSW 2308, Australia

[4] Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China

关键词: Fracture process;    Expansion cement;    Numerical simulation;    Heterogeneous materials;   

DOI  :  10.1016/j.ijsolstr.2017.03.002

来源: Elsevier

【 摘 要 】

A numerical model is proposed to study crack initiation, propagation and coalescence in heterogeneous materials subjected to expansion pressure in boreholes using the finite element method and damage mechanics. The strength heterogeneity of materials is modeled at the mesoscopic level using the Weibull distribution. Using this numerical model, the initiation and propagation of cracks generated by expansion cement in boreholes were simulated. The numerical simulations qualitatively reproduced the crack patterns in samples tested in laboratory experiments. Moreover, the results clarified the failure mechanisms and fracture processes, thereby contributing to a better understanding of fracture mechanisms in heterogeneous materials subjected to expansion pressure in boreholes. The numerical model allows direct observation of the entire process of crack initiation and growth to a degree that would be difficult to obtain in experimental studies. (C) 2017 Elsevier Ltd. All rights reserved.

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