Cracks Analysis in Zavin Concrete Dam Using Fracture Mechanics Approach

Authors

1 Ph.D. student, M.Sc. of Civil Engineering, Department of Civil Engineering, Ferdowsi University of Mashhad International Campus, Mashhad, Iran

2 Professor, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

3 Assistant Professor, Ph.D., Department of Civil Engineering, Khavaran Institute of Higher Education, Mashhad, Iran.

4 Associate Professor, Department of Civil Engineering, Payame Noor University, Tehran, Iran

Abstract

Most of the existing concrete dams are subjected to cracking. These cracks are caused by various factors such as construction practices, curing, loads and volume change of mass concrete which reduce the efficiency, failure or instability of concrete dams. Using fracture mechanics as a new method to estimate stability and durability of concrete dams is recommended in scientific publications in worldwide. This study aimed to apply the principles and criteria of linear elastic fracture mechanics to evaluate the propagation of cracks in body and foundation of Kalat concrete gravity dam -that is located in the northern province of Khorasan Razavi, Iran- subjected to the worst-case loading, including the extraordinary loading case due to earthquake with full reservoir. For this purpose, ZENCRACK-v 7.7 and ABAQUS-v 6.10.1 software were utilized and nonlinear analysis of finite element are performed. Subsequently, linear elastic fracture mechanics criteria including stress intensity factor and maximum circumferential stress were calculated for existing cracks in various parts of dam body and foundation and stability of initial cracks, kinking angle and extension of them were determined. Based on the obtained results, crack propagation in areas near to both dam abutments is investigated. To do so, a plain strain condition is assumed that only expanded in longitudinal and transverse axes, but with being away from abutments toward dam center, crack growth logged from plain strain condition and expanded in the vertical direction. Also, under earthquake load with 10 second duration, maximum tension and compression stress were occurred between 2.32 to 4.26 seconds.

Keywords


[1]     Bina K., Esfahani M. R., Sadra R., “Crack Propagation Analysis in Concrete Gravity Dams Using Fracture Mechanics Concepts”, Journal of Iranian Society of Civil Engineering (ASAS), 16 (38), 5-13, 2014.

[2]     Plizzari G.A., “LEFM Application to Concrete Gravity Dam, Journal of Engineering Mechanics; 123 (8), 808-815”, 1998.

[3]     Galvez J., Lorca J. L., Elices. M, “Fracture Mechanics Analaysis of Crack Stability in Concrete Gravity Dams”, Dam Engineering; 7 (1), 35-63 , 1996.

[4]     Soauma V. E. and Milner D., “ On Why Fracture Mechanics Should Be Adopted For Dam Safety Investigation”, Dam Engineering, 7 (3), 215-229, 1996.

[5]     Bruhwiler E., Broz J., Saouma V. E., “ Fracture Model Evaluation of Dam Concrete”, Journal of  Materials in Civil Engineering, 3 (1), 235-251, 1991.

[6]     Saouma V. E., Hansen E., Rajagopalan B., Statistical and 3D Nonlinear Finite Element Analysis of Schlegeis Dam, Technical Report, University of Colorado, 2001.

[7]     Dewey R., Reich R.E., Saouma V.E., “Uplift Modeling For Fracture Mechanics Analysis Of Concrete Dams”, Journal of Structural Engineering, 120 (10), 3025-3044, 1994.

[8]     Linsbauer H. N. Designe and Construction of Concrete Dams under Consideration of Fracture Mechanics Aspects, Institut fur konstruktiven wasserbau, Astria, 1995.

[9]     Shah S. P, Swartz S. E., Ouyang C. Fracture Mechanics Of Concrete: Applications of Fracture Mechanics to Concrete, Rock and Other Quasi-Brittle Materials, John Wiley & Sons, 1995.

[10] Kishen J.M.C, Singh K. D., “ Stress Intensity Factors Based Fracture Criteria For Kinking and Branching of Interface Crack: Application To Dams”, Journal of  Engineering Fracture Mechanics, 68, 201-219, 2001.

[11] Meguid S. A. Engineering Fracture Mechanics, Elsevier, England, 1989.

[12] ABPOY Consulting Engineers. 3D Analysis of ZAVIN Concrete Gravity Dam, Technical Report, Iran, 2002.

[13] Zentech Inc. ZENCRACK background and theory manual, Issue 6, 2011.

[14] Abrishami J., Rejayee V. Concrete Dams; Design & Construction, Astaneghods Publication, Iran, 2002. (in persian).

[15] Ellyin F. Fatigue Damage, Crack Growth and Life Prediction, Chapman and Hall, United Kingdom, 1996.

[16] Schijve J. Fatigue of Structures and Material, springer, Second Edition, 2009.

[17] Shin C. S., Wang C. M., Song P. S., “Fatigue damage repair: a comparison of some possible methods”, International Journal of Fatigue, 18, 535–46, 1996.