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| Effects of in-crack water pressure and contact condition of crack surface on crack propagation in gravity dams |
| Received:July 19, 2016 Revised:November 18, 2016 |
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| DOI：10.7511/jslx201705001 |
| KeyWord:crack propagation contact problem in-crack water pressure polygon element scaled boundary finite element |
| Author | Institution |
| 庞林 |
大连理工大学 海岸与近海工程国家重点实验室, 大连 ;大连理工大学 建设工程学部 水利工程学院 工程抗震研究所, 大连 |
| 林皋 |
大连理工大学 海岸与近海工程国家重点实验室, 大连 ;大连理工大学 建设工程学部 水利工程学院 工程抗震研究所, 大连 |
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| Abstract: |
| The polygon scaled boundary finite element method (polygon SBFEM) is used to simulate the crack propagation process of a gravity dam,including the effects of dam-reservoir-foundation interaction,contact condition of crack surfaces and in-crack water pressure.The contact model can prevent penetration of crack surface effectively.Concerning the distribution of in-crack water pressure,the aperture of the assumed rigid crack wall,the opening/closing velocity and the fluid state,i.e.,laminar flow or turbulent flow are considered.Furthermore,the cavitation and flow of the in-crack water are simulated based on the condition of continuity.The crack propagation process of the Koyna dam is analyzed to investigate the effects of contact condition of crack surface and in-crack water pressure.According to the results,the damage is increased when the contact condition is considered.Compared with the case of constant water pressure,the real distribution of water pressure has complicated influence on the results.When the crack is opening,the possibility of crack propagation is decreased,or,conversely,the possibility of crack propagation is increased,when the crack is closing. |
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