000011762 001__ 11762
000011762 005__ 20141205155944.0
000011762 04107 $$aeng
000011762 046__ $$k2008-10-12
000011762 100__ $$aSun, Junjie
000011762 24500 $$aStatic Friction Characteristics of Negative Skin Friction on Pile Induced by a Less Seismic Subsidence in Loess Field

000011762 24630 $$n14.$$pProceedings of the 14th World Conference on Earthquake Engineering
000011762 260__ $$b
000011762 506__ $$arestricted
000011762 520__ $$2eng$$aOne primary aim of the field testing in this paper is to observe the basic characteristics of negative skin friction (NSF) along pile in seismic subsidence caused by a short delay blasting, simulating an earthquake event. Fortunately, we discover that several results of this in-situ testing could indicate that the characteristic of NSF reported here differs from those before field features of NSF in collapsing loess ground. The first result is that the maximum NSF along pile hits 86kPa and this value is much more than before field NSF data related to the loess settlement by soaking. According to a statistical data of NSF by the effective stress method, this great difference cannot be explained successfully by the varied strength of soil mass and pore water pressure. The second result reveals that during the NSF’s increasing process, the position of natural point is almost at the same depth, approximately a 13m depth of pile body or a corresponding depth-buried of 15m, according with the bottom depth of seismic loess layer in the testing field. A fixed phenomenon of natural point is great contrast to the situation in collapsing loess ground evidently, in which the natural point changes its depth along pile with the development of NSF. The third result describes that NSF increases with the depth along pile gradually and there is an extreme value, likely being the maximum value also, of NSF on pile near/at the neutral point. Because position of natural point is relative stable on pile in the field testing, the distribution of NSF along pile merely bears on the weight of loess mass, which increases with the depth. Based on the three results of the field test and some statistical data in this text, the authors believe that this field testing observes a static friction characteristic of NSF, whereas the previous in-situ tests are performance of the NSF’s kinetic friction characteristic.

000011762 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000011762 653__ $$aNegative skin friction, static friction, kinetic friction, loess, seismic subsidence, settlement by soaking

000011762 7112_ $$a14th World Conference on Earthquake Engineering$$cBejing (CN)$$d2008-10-12 / 2008-10-17$$gWCEE15
000011762 720__ $$aSun, Junjie$$iWu, Zhijian$$iQiu, Rendong$$iXu, Shunhua$$iWang, Lanmin
000011762 8560_ $$ffischerc@itam.cas.cz
000011762 8564_ $$s160285$$uhttps://invenio.itam.cas.cz/record/11762/files/04-02-0029.pdf$$yOriginal version of the author's contribution as presented on CD, Paper ID: 04-02-0029.
000011762 962__ $$r9324
000011762 980__ $$aPAPER