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Abstract The high red bed accumulation body slope is a particular type in red beds areas. It is widely distributed in Guangyuan—Bazhong expressway. Starting from the reform process of red bed accumulation body，and based on the geological checking investigation，the red bed accumulation body is divided into M type，double-M type and single side type by slope top shape；and at the same time，the red bed accumulation body is divided into layered accumulation body，mass rock and soil accumulation body，clay layer beneath mass rock and soil accumulation body，mass rock and clay mix up big solitary stone by soil types and accumulation types. The excavation deformation characteristics of the four types are analyzed through the field survey data and assisted by MIDAS/GTS (MIDAS/geotechnical and tunnel analysis system). The superficial partial slumps appear in all the types of accumulation body slopes. In layered accumulation body，tractive consequent landslide is the main pattern of sliding. While circular sliding face and plane sliding along the bedrock appear in the accumulation body which includes mass rock and soil or clay. The slope deformation and failure types with solitary stone changed obviously by variety of size and location of inside solitary stone. The geological checking investigation and numerical simulation results also show that besides structure type of accumulation body，the shape of bedrock and obliquity can also affect the deform characteristics. The characteristic of red bed accumulation body has the same diversification with the red bed slope. The results provide a basis for analyze the disease patterns and mechanism，and also provide a foundation for the design of red bed accumulation body area.
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Received: 14 January 2009
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