VISCO-ELASTOPLASTIC CONSTITUTIVE MODEL FOR SEDIMENTARY SOFT ROCK AND ITS APPLICATION TO NUMERICAL CALCULATION
YE Guanlin1，ZHANG Feng2，SHENG Jiaren1，WANG Jianhua1
(1. Department of Civil Engineering，Shanghai Jiaotong University，Shanghai 200240，China； 2. Department of Civil Engineering，Nagoya Institute of Technology，Nagoya 466–8555，Japan)
Abstract：The sedimentary soft rock is a kind of geomaterial that exhibits the mechanical properties of strain softening，rheology，and influenced by the intermediate principal stress. In order to describe these properties as comprehensively as possible，a new visco-elastoplastic constitutive model is developed. Based on the tij concept and subloading surface，this model uses a state variable r which is a void ratio difference between the over- consolidated and normal consolidated states，and introduces a non-homogenous function as an evolution law for r. Compared to the Cam-clay model，only 4 new parameters are added to the new model，which have explicit physical meanings and can be determined from triaxial tests. A progressive failure of soft rock slope due to heavy rain is taken as background，and soil-water coupled FEM is conducted to investigate the influences of 2 kinds of groundwater table changes on the failure. The shear strain，displacement vector and propagation of the failure among the slope are analyzed carefully to clarify its failure.
叶冠林，张锋，盛佳韧，王建华. 堆积软岩的黏弹塑性本构模型及其数值计算应用[J]. 岩石力学与工程学报, 2010, 29(07): 1348-1354.
YE Guanlin1，ZHANG Feng2，SHENG Jiaren1，WANG Jianhua1. VISCO-ELASTOPLASTIC CONSTITUTIVE MODEL FOR SEDIMENTARY SOFT ROCK AND ITS APPLICATION TO NUMERICAL CALCULATION. , 2010, 29(07): 1348-1354.
