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Articles 1 - 11 of 11
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 …
Constitutive Models For Dynamic Strain Aging In Metals: Strain Rate And Temperature Dependences On The Flow Stress, Yooseob Song, Daniel Garcia-Gonzalez, Alexis Rusinek
Constitutive Models For Dynamic Strain Aging In Metals: Strain Rate And Temperature Dependences On The Flow Stress, Yooseob Song, Daniel Garcia-Gonzalez, Alexis Rusinek
Civil Engineering Faculty Publications and Presentations
A new constitutive model for Q235B structural steel is proposed, incorporating the effect of dynamic strain aging. Dynamic strain aging hugely affects the microstructural behavior of metallic compounds, in turn leading to significant alterations in their macroscopic mechanical response. Therefore, a constitutive model must incorporate the effect of dynamic strain aging to accurately predict thermo-mechanical deformation processes. The proposed model assumes the overall response of the material as a combination of three contributions: athermal, thermally activated, and dynamic strain aging stress components. The dynamic strain aging is approached by two alternative mathematical expressions: (i) model I: rate-independent model; (ii) model …
A Simple One-Scale Constitutive Model For Static Liquefaction Of Sand-Silt Mixtures, Yang Liu, Ching-Shung Chang, Shun-Chuan Wu
A Simple One-Scale Constitutive Model For Static Liquefaction Of Sand-Silt Mixtures, Yang Liu, Ching-Shung Chang, Shun-Chuan Wu
Civil and Environmental Engineering Faculty Publication Series
Instability of liquefaction is one of the major reasons which results in the failure of earth structure such as dam. The present study focuses on the simulation of static liquefaction behavior for granular materials such as sand and sand-silt mixtures. Based on micromechanical analysis of inter-particle behavior, a simple one-scale model is proposed to simulate the stress-strain response of sand; then the proposed model is extended to simulate the sand-silt mixtures using the mixture theory combining the properties of sand and silt according to their proportions. Empirical expressions are introduced to fit the critical state strength and the location of …
A High Strain-Rate Constitutive Model For Sand With Application In Finite Element Analysis Internal Geotechnical Report 2011-4, William Higgins, Dipanjan Basu
A High Strain-Rate Constitutive Model For Sand With Application In Finite Element Analysis Internal Geotechnical Report 2011-4, William Higgins, Dipanjan Basu
Technical Reports
The report presents a constitutive model for simulating the high strain-rate behavior of sands. Based on the concepts of critical-state soil mechanics, the bounding surface plasticity theory and the overstress theory of viscoplasticity, the constitutive model simulates the high strain-rate behavior of sands under uniaxial, triaxial and multiaxial loading conditions. The model parameters are determined for Ottawa and Fontainebleau sands, and the performance of the model under extreme transient loading conditions is demonstrated through simulations of split Hopkinson pressure bar tests up to a strain rate of 2000/sec. The constitutive model is implemented in a finite element analysis software to …
Simplification Of Resilient Modulus Testing For Subgrades, Daehyeon Kim, Nayyar Zia Siddiki
Simplification Of Resilient Modulus Testing For Subgrades, Daehyeon Kim, Nayyar Zia Siddiki
JTRP Technical Reports
Resilient modulus has been used for characterizing the stress-strain behavior of subgrade soils subjected to traffic loadings in the design of pavements. With the recent release of the M-E Design Guide, highway agencies are further encouraged to implement the resilient modulus test to improve subgrade design. In the present study, physical property tests, unconfined compressive tests, resilient modulus (Mr) tests and Several Dynamic Cone Penetrometer (DCP) tests were conducted to assess the resilient and permanent strain behavior of 14 cohesive subgrade soils and five cohesionless soils encountered in Indiana. The applicability for simplification of the existing resilient modulus test, AASHTO …
Pile Design Based On Cone Penetration Test Results, Rodrigo Salgado, Junhwan Lee
Pile Design Based On Cone Penetration Test Results, Rodrigo Salgado, Junhwan Lee
JTRP Technical Reports
The bearing capacity of piles consists of both base resistance and side resistance. The side resistance of piles is in most cases fully mobilized well before the maximum base resistance is reached. As the side resistance is mobilized early in the loading process, the determination of pile base resistance is a key element of pile design. Static cone penetration is well related to the pile loading process, since it is performed quasi-statically and resembles a scaled-down pile load test. In order to take advantage of the CPT for pile design, load-settlement curves of axially loaded piles bearing in sand were …