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Centrifuge modelling of pile-soil interaction in liquefiable slopes
Haigh, Stuart K.,Gopal Madabhushi, S.P. Techno-Press 2011 Geomechanics & engineering Vol.3 No.1
Piles passing through sloping liquefiable deposits are prone to lateral loading if these deposits liquefy and flow during earthquakes. These lateral loads caused by the relative soil-pile movement will induce bending in the piles and may result in failure of the piles or excessive pile-head displacement. Whilst the weak nature of the flowing liquefied soil would suggest that only small loads would be exerted on the piles, it is known from case histories that piles do fail owing to the influence of laterally spreading soils. It will be shown, based on dynamic centrifuge test data, that dilatant behaviour of soil close to the pile is the major cause of these considerable transient lateral loads which are transferred to the pile. This paper reports the results of geotechnical centrifuge tests in which models of gently sloping liquefiable sand with pile foundations passing through them were subjected to earthquake excitation. The soil close to the pile was instrumented with pore-pressure transducers and contact stress cells in order to monitor the interaction between soil and pile and to track the soil stress state both upslope and downslope of the pile. The presence of instrumentation measuring pore-pressure and lateral stress close to the pile in the research described in this paper gives the opportunity to better study the soil stress state close to the pile and to compare the loads measured as being applied to the piles by the laterally spreading soils with those suggested by the JRA design code. This test data shows that lateral stresses much greater than one might expect from calculations based on the residual strength of liquefied soil may be applied to piles in flowing liquefied slopes owing to the dilative behaviour of the liquefied soil. It is shown at least for the particular geometry studied that the current JRA design code can be un-conservative by a factor of three for these dilation-affected transient lateral loads.
Transmission electron microscopy without aberrations: Applications to materials science
Angus Kirkland,Lan-Yun Chang,Sarah Haigh,Crispin Hetherington 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Aberration correction leads to a substantial improvement in the directly interpretable resolution of transmission electron microscopes.Direct electron optical correction based on a hexapole corrector and indirect computational analysis of a focal or tilt series of imagesoer complementary approaches and a combination of the two provides additional advantages. This paper describes aberration cor-rected instrumentation installed in Oxford which is equipped with correctors for both the image-forming and probe-forming lenses.bining direct and indirect methods.
담즙내 Oxysterol에 의한 담낭 상피세포의 Apoptosis와 그 기전에 관한 연구
서동완 ( Seo Dong Wan ),이성구 ( Lee Seong Gu ),김명환 ( Kim Myeong Hwan ),( Geoffrey Haigh ),( Sum P. Lee ) 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> 담낭은 담즙을 저장하고 농축하는 기능이 있어서 담낭 상피세포는 고농도의 콜레스테롤에 노출되어 있다. 한편 콜레스테롤의 산화물인 oxysterol은 혈액과 여러 장기에서 검출되고 있으며 담즙과 담석내에서도 oxysterol의 일종인 cholest-4-en-3-one, cholesta-4,6-dien-3-one 그리고 cholesta-3,5-dien-7-one 등이 존재한다고 보고된 바 있다. 그러나 이러한 oxysterol들이 담도내에서 어떤 역