Seismic Damage and Analysis of the Xiker Earth Dam During the 2020 Jiashi Earthquake, Northwestern China

The 2020 Jiashi Mw 6.0 earthquake occurred at the Kepingtage fold-and-thrust belt in South Tianshan front, Northwestern China. ground shaking caused extensive co-seismic deformation of Xiker dam meizoseismal area. We obtained strata distribution characteristics foundation through drilling. Using laboratory and situ tests, particle size distribution, standard penetration, shear wave velocity each layer were obtained. Along with peak acceleration, we evaluated potential sand liquefaction various layers proposed a relationship between fissures liquefaction. Our results suggest that silty 0–3 m beneath foundation. Sand occurs behind dam, resulting uneven settlement foundation, making horizontal backslope significantly larger than foreslope dam. numerical simulations, found can cause different vectors (maximum is ∼7.45 cm) backslope, which to rotate downstream direction. Large also formed on crest.