Variation Law of Water  Pressure in Crack under Earthquake Loads

YANG Kai-gang; LI Zong-li; ZHANG Guo-hui

doi:10.11988/ckyyb.20170219

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Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (9) : 143-147. DOI: 10.11988/ckyyb.20170219

HYDRAULIC STRUCTURE AND MATERIAL

Variation Law of Water Pressure in Crack under Earthquake Loads

YANG Kai-gang, LI Zong-li, ZHANG Guo-hui

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Abstract

Water-containing cracks on concrete gravity dam are susceptible to instability due to additional water pressure generated by water compression caused by the rapid opening and closing of cracks under seismic load. In an attempt to obtain the variation law of water pressure in cracks under seismic load, we deducted the formula of additional water pressure in cracks under seismic load based on the assumption that the crack is oval. By case study, we analyzed the changes of additional pressure and factor of stress intensity at crack tip in different directions in the presence of varying crack size and drainage rate. Results revealed that the maximum additional water pressure of the calculation case reached 7.55 times of initial water pressure under seismic load. Meanwhile, with the increase of initial crack width, the maximum additional water pressures and the factor of stress intensity at crack tip declined rapidly; with the decrease of initial crack width, the influence of drainage rate on additional water pressure became more evident. In addition, the inclination angle of crack had no obvious impact on the factor of stress intensity at crack tip.

Key words

crack / seismic load / calculation model / maximum additional water pressure / stress intensity factor

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YANG Kai-gang, LI Zong-li, ZHANG Guo-hui. Variation Law of Water Pressure in Crack under Earthquake Loads[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(9): 143-147 https://doi.org/10.11988/ckyyb.20170219

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