(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Taking the red-bed soft rock as investigative subject，which has caused many deformation failures during the West-section of Shanghai-Chengdu construction，the deformation characteristics of red-bed soft rock are analyzed through indoor triaxial test，field load-bearing plate test and rheological test. With the triaxial test on natural and saturated red-bed soft rocks，the elastic constitutive equations of red-bed soft rock，considering the closing of structural surface，are established；and the deformation characteristics of water-bearning influence is analyzed. By performing load- bearing plate test，the deformation characteristics of two kinds of red-bed soft rocks with different argillaceous contents are analyzed. Meanwhile，the rock characteristics under cyclic load，and the stress and displacement distribution and the influential range and depth are studied. With the rheological test，the rheological constitutive equation considering the closing of structural surface is also established. Through the tests，the deformation characteristics of red-bed soft rock are further understanded，and it can provide the basis for further research. The results can give some advices to the design of counter-inclined red-bed soft rock slope，and can also offer references to the research on the reinforcement effect of prestressed cables.
