title: Experimental investigation and constitutive model for lime mudstone.
abstract: In order to investigate the mechanical properties of lime mudstone, conventional triaxial compression tests under different confining pressures (0, 5, 15 and 20 MPa) are performed on lime mudstone samples. The test results show that, from the overall perspective of variation law, the axial peak stress, axial peak strain and elastic modulus of lime mudstone tend to gradually increase with increasing confining pressure. In the range of tested confining pressure, the variations in axial peak stress and elastic modulus with confining pressure can be described with linear functions; while the variation in axial peak strain with confining pressure can be reflected with a power function. To describe the axial stress-strain behavior in failure process of lime mudstone, a new constitutive model is proposed, with the model characteristics analyzed and the parameter determination method put forward. Compared with Wang' model, only one parameternis added to the new model. The comparison of predicted curves from the model and test data indicates that the new model can preferably simulate the strain softening property of lime mudstone and the axial stress-strain response in rock failure process.
authors.affiliation: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055 China.|School of Civil Engineering, Chongqing University, Chongqing, 400045 China.
authors.forename: Junbao
authors.identifier: 0000-0002-3417-9884
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055 China.|School of Civil Engineering, Chongqing University, Chongqing, 400045 China.
authors.forename: Xinrong
authors.initials: X
authors.lastname: Liu
authors.affiliation: Department of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing, 401331 China.
authors.forename: Baoyun
authors.initials: B
authors.lastname: Zhao
authors.affiliation: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055 China.
authors.forename: Zhanping
authors.initials: Z
authors.lastname: Song
authors.affiliation: School of Highway, Chang'an University, Xi'an, 710064 China.
authors.forename: Jinxing
authors.initials: J
authors.lastname: Lai
keywords: Constitutive model; Lime mudstone; Mechanical property; Test