000012120 001__ 12120
000012120 005__ 20141205160021.0
000012120 04107 $$aeng
000012120 046__ $$k2008-10-12
000012120 100__ $$aWu, Zhijian
000012120 24500 $$aA Study on Characteristics of Ground Motion in Permafrost Sites along the Qinghai-Tibet Railway

000012120 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000012120 260__ $$b
000012120 506__ $$arestricted
000012120 520__ $$2eng$$aBased on field geological investigation at permafrost regions, geological description and test of waves velocities of the 14 typical drilling holes distributing permafrost areas along the Qinghai-Tibet railway, elementary characteristics of soil wave velocities at the permafrost regions are presented. And then, combining results of dynamic triaxiality test, using 3 time histories of ground motion acceleration with the exceedance probabilities (62.5%, 10% and 2%) related to this research area, characteristics of ground motion are analyzed for the 10 permafrost profiles by an equivalent linearization method to estimate the seismic response of frozen soil ground. Moreover, influence of earth temperature on seismic acceleration respond spectrum for permafrost sites is studied. Consequently, there are 4 results could be revealed as follows: 1) at the similar conditions, waves velocities of frozen soils along the Qinghai-Tibet railway are greater than other non-frozen soils areas, and velocity ratio between shear wave and compression wave does the same also; 2) earthquake strength is a critical factor to influence the acceleration amplitude of ground motion at permafrost regions, e.g. with the depressing of earthquake strength, acceleration amplitude of ground motion reduces gradually; 3) proportions of moderate and short period of seismic acceleration respond spectrum in permafrost regions are evidently greater than other non-frozen areas; and 4) amplitude of acceleration response spectrum of ground motion decreases distinctly while earth temperature of frozen soils reduces. As an expectation of authors, this paper should contribute to earthquake disaster prevention of the engineering structures in permafrost areas at Qinghai-Tibet Plateau.

000012120 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012120 653__ $$aQinghai-Tibet railway, permafrost, velocity of wave, ground motion, earth temperature

000012120 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000012120 720__ $$aWu, Zhijian$$iSun, Junjie$$iXu, Shunhua$$iWang, Lanmin$$iCheng, Guodong
000012120 8560_ $$ffischerc@itam.cas.cz
000012120 8564_ $$s2399357$$uhttps://invenio.itam.cas.cz/record/12120/files/S09-004.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: S09-004.
000012120 962__ $$r9324
000012120 980__ $$aPAPER