Open Access. Powered by Scholars. Published by Universities.®
Civil and Environmental Engineering Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Civil and Environmental Engineering
Creep–Fatigue Constitutive Model Of Salt Rock Based On A Hardening Parameter, Jin-Yang Fan, Lu-Xuan Tang, Jie Chen, Zhen-Yu Yang, De-Yi Jiang
Creep–Fatigue Constitutive Model Of Salt Rock Based On A Hardening Parameter, Jin-Yang Fan, Lu-Xuan Tang, Jie Chen, Zhen-Yu Yang, De-Yi Jiang
Rock and Soil Mechanics
Salt rock has been recognized as an ideal medium for energy storage or oil and gas storage because of its good creep and self-healing characteristics. Accurate characterization and prediction of the complex mechanical behavior of salt rock is the basis for ensuring the safety of underground space utilization project of salt caverns. Based on proposed parameters of hardening and other characteristic factors, in this study, a new creep–fatigue constitutive model is developed for salt rock considering complex loading and unloading paths. Based on the dislocation mechanism of salt rock deformation, hyperbolic damping elements are introduced as state variables to characterize …
Static Characteristics And Engineering Applications Of Micro Negative Poisson’S Ratio Bolt, Zhi-Gang Tao, Ai-Peng Guo
Static Characteristics And Engineering Applications Of Micro Negative Poisson’S Ratio Bolt, Zhi-Gang Tao, Ai-Peng Guo
Rock and Soil Mechanics
Compared with traditional small deformation bolt materials, the negative Poisson’s ratio (NPR) bolt/cable material has excellent mechanical properties such as large elongation, high strength, high toughness, high constant resistance, and energy absorption. Based on the research and application of macro-NPR bolts/cables, He Manchao developed a new type of micro-NPR steel material and a new type of micro-NPR bolt. At present, there are few studies on the static characteristics of the micro-NPR steel, and the applicability of the micro-NPR anchor in urban underground tunnel engineering needs to be verified by field tests. The mechanical properties of the micro-NPR steel were studied …
Investigation Of Damage Evolution And Its Model Of Rock-Like Brittle Materials, Chao Zhang, Chu-Qing Yang, Yun Bai
Investigation Of Damage Evolution And Its Model Of Rock-Like Brittle Materials, Chao Zhang, Chu-Qing Yang, Yun Bai
Rock and Soil Mechanics
To investigate the description and evolution of the damage state of rock-like brittle materials, the physical meaning of each elastic modulus method parameter based on the strain equivalence hypothesis and the limitations of the model application are discussed. The modulus change during the triaxial cyclic loading and unloading test of limestone is studied. Moreover, the defects of the unloading modulus substitution method and the statistical damage evolution model in damage evolution analysis are discussed. The results show the existing elastic modulus method can only be used to reflect the damage evolution process of rock under uniaxial compression, and the unloading …
Statistical Damage Constitutive Model Of High Temperature Rock Based On Weibull Distribution And Its Verification, Hao-Peng Jiang, An-Nan Jiang, Xiu-Rong Yang
Statistical Damage Constitutive Model Of High Temperature Rock Based On Weibull Distribution And Its Verification, Hao-Peng Jiang, An-Nan Jiang, Xiu-Rong Yang
Rock and Soil Mechanics
The decrease of rock stability is caused by the possible deterioration of rock mechanical properties under high temperature environment. Therefore, the study of the constitutive behavior of rocks under high temperature is of great significance. Based on the recent researches of statistical rock damage constitutive model, the statistical damage constitutive model of rock after high temperature is established by adopting M-C criterion with the thermal damage variable and Weibull distribution function and the parameter expression is determined. The model is compared with the theoretical curve to verify its rationality. Finally, the model is verified by the uniaxial compression test results …
Rock Plastic-Damage Constitutive Model Based On Energy Dissipation, Qiu-Feng Ma, Zhi-He Liu, Yue-Ping Qin, Jing Tian, Shu-Li Wang
Rock Plastic-Damage Constitutive Model Based On Energy Dissipation, Qiu-Feng Ma, Zhi-He Liu, Yue-Ping Qin, Jing Tian, Shu-Li Wang
Rock and Soil Mechanics
In this paper, the dissipative energy in the damage process was employed to solve the damage variable while the damage constitutive model was established. In this model, the Mohr-Coulomb criterion and the energy dissipation theory were introduced. Considering the hardening and softening characteristics of rock during loading, the non-associated plastic flow rule was applied to describe the plastic deformation of rock, and the damage variable was calculated by quoting the dissipation energy and damage energy dissipation rate in the damage process. Based on the conventional triaxial loading-unloading experiments, the energy consumption and damage evolution law of rock was analyzed. The …
Study On Constitutive Model Of Fractured Rock Mass Based On Statistical Strength Theory, Wei Gao, Cheng-Jie Hu, Tian-Yang He, Xin Chen, Cong Zhou, Shuang Cui
Study On Constitutive Model Of Fractured Rock Mass Based On Statistical Strength Theory, Wei Gao, Cheng-Jie Hu, Tian-Yang He, Xin Chen, Cong Zhou, Shuang Cui
Rock and Soil Mechanics
With the aid of damage mechanics and on the basis of statistical strength theory, a method for establishing the constitutive model of deep fractured rock mass is proposed and verified by laboratory and numerical tests. The fractured rock mass is divided into numerous micro-cubes. The strength of micro-cubes is related to the fracture degree and the strength of each micro-cube is randomly distributed. Thus the strength can be used to reflect the fracture degree of the rock mass. Among them, based on the fact that the work done by friction between fracture surfaces is equal to the strain energy released …