Abstract：Research purposes: During the realization of Algeria East － West Highway Project，toppling deformation of marlite slope was observed in several places and some slopes were even transformed into landslide，which was unfavorable for project advancement． In this case，it is necessary to research on the mechanism of toppled and deformed slopes and to study their stability，in order to proceed to treatment or pre － consolidation before toppling deformation．
Research conclusions: ( 1) Deformation failure mode of the slope is dependent on the inner structure of slope，the physic － mechanical properties and outsider factors; ( 2) Studies on mechanism of the slope deformation failure and on slope deformation failure and stability at every different evolution stage are necessary for proposing proper slope treatment measures in accordance with its development stage; ( 3) Comprehensive treatment proposition，which combines several propositions such as earthwork reliving，materials replacement，anchorage，retaining and drainage etc． ，could be taken into consideration during the treatment．
Ding Xiaojun，Liu Weimin，Wang Zuo，etc． Mechanism for Toppling Deformation and Treatment Engineering Examples of Soft Rock Slope ［M］． Beijing: China Communications Press，2011．
CCCC First Highway Consultants Co． Ltd． Engineering Geological Investigation Report on Toppling Deformation Slope of Lot M3 PK137 + 035 － PK137 + 420 Algeria East － West Highway Project ［R］． Xi ＇an: CCCC First Highway Consultants Co． Ltd，2009．
CCCC First Highway Consultants Co． Ltd． Treatment Design Report on Toppling Deformation Slope of Lot M3 PK137 + 035 － PK137 + 420 Algeria East － West Highway Project ［R］． Xi ＇an: CCCC First Highway Consultants Co． Ltd，2009．
Han Xin． Research on Differences between Chinese and European( French) Standard Systems for Geotechnical Engineering ［J ］． Journal of Railway Engineering Society，2011( 11) : 117 － 121．
2012, Vol. 29 
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