中国牛人外文翻译

ORIGINAL PAPER

Stability assessment of a slope under a transformer substation using numerical modelling

H.J.Li •F.C.Dai •W.C.Li •L.Xu •

H.Min

Received:2April 2010/Accepted:26July 2010/Published online:17September 2010ÓSpringer-Verlag 2010

Abstract This paper presents an analysis of the defor-mation mechanism and stability assessment of a slope in Yunnan Province,China.Field investigations indicated that the deformation of the slope was caused by the com-bined effects of the unfavorable topographical,geological and hydrogeological conditions and the placement of man-made fill.The stability of the slope was assessed by 3D numerical modeling which showed that the factor of safety of the slope was 1.1in the natural state but reduced to 1.03after fill was placed.Pile reinforcement was undertaken,which raised the factor of safety to 1.27.

Keywords Fill slope ÁDeformation mechanism ÁNumerical modelling ÁStrength reduction

Re

´sume ´L’article pre ´sente une analyse du me ´canisme de de

´formation et une e ´valuation de la stabilite ´d’une pente dans la province de Yunnan,en Chine.Les travaux de

terrain ont indique

´que la de ´formation de la pente re ´sultait d’effets combine

´s en rapport avec des conditions topo-graphiques,ge

´ologiques et hydroge ´ologiques de ´favorables et la construction d’un stabilite

´de la pente a e

´te ´e ´value ´e a `l’aide d’une simulation nume ´rique 3D qui a montre

´que le facteur de se ´curite ´de la pente valait 1,1en conditions naturelles mais passait a

`1,03apre `s construction du remblai.Des renforcements par pieux ont e

´te ´re ´alise ´s,ce qui a fait passer le coefficient de se

´curite ´a `1,27.Mots cle

´s Remblai sur pente ÁMe ´canisme de de

´formation ÁSimulation nume ´rique ÁDiminution de re

´sistance Introduction

In order to develop the provincial economy and satisfy the need for power,a 220kV transformer substation was constructed in Yanjin,located in northeastern Yunnan Province,PR China.The construction of the transformer substation commenced in November 2004,and the site was filled in March 2005.The total volume of cut and fill was 152,000m 3.The compaction was accomplished using a sheeps-foot roller with a layer thickness of 200mm.

During heavy rainfall between July 18and July 20,2005,a creeping slide was observed in the slope at the northwest of the construction site.It led to tensile cracks in the retaining wall with a maximum crack width of 20cm.Meanwhile,the foundation of the 110kv framework located on the top of the slope subsided by 29cm.The moving slope was 340m long and 100m wide.The unstable slope threatened the safety of the transformer substation,the end tower of the 110kv power output and the lives and prop-erties of the residents nearby.After deformation,the fill slope was reinforced immediately with 23rectangular piles in the northwest of the site and 41circular piles in two rows at the northwestern corner of the site.Each rectangular pile

H.J.Li (&)

Institute of Mine Safety Technology,China Coal Research Institute,

Beijing 100013,People’s Republic of China e-mail:geolhj@

F.C.Dai ÁW.C.Li ÁL.Xu

Institute of Geology and Geophysics,

Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,People’s Republic of China H.Min

Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,

Wuhan 430071,People’s Republic of China

Bull Eng Geol Environ (2011)70:385–394DOI 10.1007/s10064-010-0318-7