Abstract
Taking Peng Jiawan slope in Yiba expressway as the project background, the deformation and failure mechanism of slope with interbedding of soft and hard rocks was studied on the basis of geological analysis and similarity theory. In geomechanical model test, the water infiltration softening process is used to simulate the rainfall infiltration. The result indications showed as follows: under the condition, the deformation mode of the slope is the previous sliding-tension and upper overall creep-slip, and the failure mode is overall slip failure in the sliding zone of deep soft rock. Strictly speaking, the deformation of hard rock differs from the deformation of soft rock, hard rock deforms mainly on sliding-tension and soft rock deforms mainly on overall creep-slippage. Changes of the condition of deep soft rock affect the total stability of the interbedded slope mostly.
Highlights
In recent years, Chinese national power has become increasingly powerful
Interbedded rock slope of soft and hard rock refers to the slope composed of two or more groups of rock masses with great difference in strength into interbedded structure, which is widely distributed in southwest, northwest, central and south China[1]
The exposed slope will be affected by rainfall infiltration, especially the soft rock layer
Summary
Chinese national power has become increasingly powerful. As an economic accelerator, expressway construction started late, but it has developed rapidly. With the gradual strengthening of differential weathering and hydraulic action , The soft rock layer will develop into a weak rock layer that seriously affects the stability of the slope[2], resulting in a large number of landslide geological disasters, such as Xuanhan Tiantai Township landslide[3], Chongqing Jiwei Mountain landslide[4], Qinghai Plateau Longmulgou red bed landslide[5], etc These disasters will bring about serious socio-economic losses. Wu Honggang[5] had studied the historical evolution process which was caused by the twice attenuation of red-bed rock mass strength of gaoyuan red-bed landslide in Qinghai These existing studies were focused more on the ground motion response and rock mass materials of the interbedded soft and hard rock slope, but there is less studies of systematic and experimental research on the deformation and failure mode of the interbedded rock slope. The study might provide reference for the following study of similar slope
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