Evaluation of Strength and Failure of Brittle Rock Containing Initial Cracks under Lithospheric Conditions

• Autorzy: Li X. , Qi C. , Shao Z. , Ma C.

Identyfikatory

DOI

10.1007/s11600-018-0123-4

• Języki publikacji: EN

Abstrakty

EN

Natural brittle rock contains numerous randomly distributed microcracks. Crack initiation, growth, and coalescence play a predominant role in evaluation for the strength and failure of brittle rocks. A new analytical method is proposed to predict the strength and failure of brittle rocks containing initial microcracks. The formulation of this method is based on an improved wing crack model and a suggested micro-macro relation. In this improved wing crack model, the parameter of crack angle is especially introduced as a variable, and the analytical stress-crack relation considering crack angle effect is obtained. Coupling the proposed stresscrack relation and the suggested micro-macro relation describing the relation between crack growth and axial strain, the stress-strain constitutive relation is obtained to predict the rock strength and failure. Considering different initial microcrack sizes, friction coefficients and confining pressures, effects of crack angle on tensile wedge force acting on initial crack interface are studied, and effects of crack angle on stress-strain constitutive relation of rocks are also analyzed. The strength and crack initiation stress under different crack angles are discussed, and the value of most disadvantaged angle triggering crack initiation and rock failure is founded. The analytical results are similar to the published study results. Rationality of this proposed analytical method is verified.

Słowa kluczowe

EN

brittle rocks; crack angle; friction; strength; failure

PL

skały kruche; kąt pęknięcia; tarcie; siła; niepowodzenie

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2018
• Tom: Vol. 66, no. 2
• Strony: 141--152
• Opis fizyczny: Bibliogr. 46 poz.

Twórcy

autor

Li X.

• School of Civil and Transportation Engineering, Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China
• School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, China

autor

Qi C.

• School of Civil and Transportation Engineering, Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China

autor

Shao Z.

• School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, China

autor

Ma C.

• School of Civil and Transportation Engineering, Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing, China

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018)