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Full-Text Articles in Engineering
3d Experimental Studies Of Temperature And Crystallographic Effects On Creep And Strength In Rock Salt, Amirsalar Moslehy
3d Experimental Studies Of Temperature And Crystallographic Effects On Creep And Strength In Rock Salt, Amirsalar Moslehy
Doctoral Dissertations
Salt domes utilization as storage reservoirs in the energy sector has led to extensive studies on rock salt’s mechanical and geothermal behavior. These important facilities’ safety and serviceability rely on understanding rock salt’s compressive strength and creep behavior under various loading directions, water contents, in-situ stresses, and temperatures. Despite numerous studies on rock salt’s mechanical behavior in the literature, there are still many unanswered questions about rock salt’s behavior. This dissertation was aimed at utilizing state-of-the-art experimental techniques such as 3D synchrotron micro-computed tomography (SMT) and 3D x-ray diffraction (3DXRD) along with hundreds of compression and creep experiments to enhance …
Long-Term Stress Characteristics And Load Reduction Effect Of High-Fill Box Culverts With Eps Slabs, Qi Gao, Bao-Guo Chen, Sen Wu, Shan Yuan, Meng-Yao Sun
Long-Term Stress Characteristics And Load Reduction Effect Of High-Fill Box Culverts With Eps Slabs, Qi Gao, Bao-Guo Chen, Sen Wu, Shan Yuan, Meng-Yao Sun
Rock and Soil Mechanics
Laying expandable polystyrene (EPS) slabs on the top of high-fill box culverts to reduce earth pressure has been used in engineering practice, but the creep of EPS slabs will cause the earth pressure on the box culvert to change over time. The present design theory of box culverts cannot clearly reflect the long-term load reduction effect of EPS slabs and the long-term stress characteristics of box culverts. In this analysis, model tests were carried out to investigate the short-term stress characteristics of the box culvert with EPS slabs, and a numerical model was validated by the model test results. Then …
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 …
Macroscopic And Microscopic Experimental Study On Fractal Fragmentation Characteristics Of Calcareous Sand During One-Dimensional Compression Creep, Bin Chen, Jian Deng, Jie-Ming Hu, Jian-Lin Zhang, Tao Zhang
Macroscopic And Microscopic Experimental Study On Fractal Fragmentation Characteristics Of Calcareous Sand During One-Dimensional Compression Creep, Bin Chen, Jian Deng, Jie-Ming Hu, Jian-Lin Zhang, Tao Zhang
Rock and Soil Mechanics
Calcareous sand is a natural foundation material for ports, airports and some civil buildings in ocean areas. Through the one-dimensional compression creep test of calcareous sand and the analysis of its micro-structure, it was found that the surface pore area decreased after creep and showed a dispersed distribution. In addition, the characteristics of instantaneous deformation, rapid deformation and attenuation deformation of the sample during the test were highly correlated with the particle size. The relative particle breakage rate and mass fractal dimension improved based on fractal theory were used to describe the degree of particle breakage after creep. The relationship …
Effect Of Loading Rate Change On The Mechanical Properties Of Mudstone Under Uniaxial Compression, Fu-Lin Li, Jian Yang, Wei-Qun Liu, Zhen-Hua Fan, Yu-Gui Yang
Effect Of Loading Rate Change On The Mechanical Properties Of Mudstone Under Uniaxial Compression, Fu-Lin Li, Jian Yang, Wei-Qun Liu, Zhen-Hua Fan, Yu-Gui Yang
Rock and Soil Mechanics
To study the effect of the loading rate change on the deformation and strength properties and creep behavior of mudstone, a series of uniaxial compression tests and graded loading creep tests was conducted on mudstone specimens at four loading rates (0.005, 0.05, 0.5, and 3 mm/min). The test results find that the mudstone exhibits an obvious loading rate change effect, which is represented by an isotach viscosity behavior. When loading at a constant rate, different stress-strain relationships are observed and corresponded to different constant loading rates. When loading at variable rates, as the loading rate changes, the stress-strain relationships also …
Study On The Mechanical Model Of Macro-Mecro Creep Under High Seepage Pressure In Brittle Rocks, Xiao-Zhao Li, Li-Ren Ban, Cheng-Zhi Qi
Study On The Mechanical Model Of Macro-Mecro Creep Under High Seepage Pressure In Brittle Rocks, Xiao-Zhao Li, Li-Ren Ban, Cheng-Zhi Qi
Rock and Soil Mechanics
High seepage pressure has a great significance on creep behaviors of brittle rocks under deep underground engineering. However, the macro-mecro relationship between mecrocrack growth and macroscopic deformation under high seepage pressure during the decelerated, steady-state, accelerated creep has been rarely studied. In this study, based on the stress intensity model of crack tips with the influence of initial cracks and new wing cracks, the mechanical relationship between seepage pressure and initial cracks and new wing cracks is introduced, and the stress intensity model model of crack tips considering seepage pressure is established. Then combined with the subcritical crack law and …
Study On Creep Characteristics Of Claystone Under Thermo-Hydro- Mechanical Coupling, Wei-Zhong Chen, Fan-Fan Li, Jiang Lei, Hong-Dan Yu, Yong-Shang Ma
Study On Creep Characteristics Of Claystone Under Thermo-Hydro- Mechanical Coupling, Wei-Zhong Chen, Fan-Fan Li, Jiang Lei, Hong-Dan Yu, Yong-Shang Ma
Rock and Soil Mechanics
As an alternative medium for the underground disposal of radioactive waste, claystone will be in the complex conditions of thermo-hydro-mechanical coupling for a long time. In order to study the long-term stability of surrounding rocks, a series of heating-cooling drainage creep tests on claystone was carried out under different confining pressures and deviatoric stresses, and the following conclusions were drawn. The rise of temperature will increase the creep rate of claystone, and extend the time of decay creep stage. But during the cooling process, the samples mainly experience shrinkage deformation without obvious creep deformation being observed. The decrease of confining …
Analysis Of Energy Evolution During The Step Loading And Unloading Creep Experiments Of Sandstone, Chao Han, De-Peng Pang, De-Jian Li
Analysis Of Energy Evolution During The Step Loading And Unloading Creep Experiments Of Sandstone, Chao Han, De-Peng Pang, De-Jian Li
Rock and Soil Mechanics
The uniaxial step loading and unloading creep experiments were conducted on the sandstone samples from Shaanxi Province to analyze the law of energy evolution of the samples during the process of deformation and failure. The results show that with the increase of cyclic series, the dissipation energy of each grade exhibits a nonlinear increase and the plastic strain energy of each grade is relatively stable. The dissipation energy exceeding plastic strain energy can be regarded as a precursor energy characteristic of the sample failure. By defining the correlation coefficient and establishing the relationship between energy and deformation, it can be …