EXPERIMENT STUDY ON MECHANICAL PROPERTIES OF GRANITE UNDER REPEATED LOADING AND UNLOADING

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1634-1639 ◽  
Author(s):  
YUN-HUA HU ◽  
QUAN-SHENG LIU
Keyword(s):  
Acoustic Emission ◽  
Plastic Strain ◽  
Axial Stiffness ◽  
Repeated Loading ◽  
Testing System ◽  
Lateral Stiffness ◽  
Internal Damage ◽  
Brittle Rocks ◽  
Loading And Unloading ◽  
Change Trend

Deformation rules and acoustic emission characteristics of granite under repeated loading-unloading are studied using the MTS Mechanics Testing System and Disp. acoustic emission instrument. It's found that the axial stiffness of granite as well as Poisson's ratio increases with the development of the plastic strain while the change trend of lateral stiffness is negative. For brittle rocks, strain is produced by three mechanisms: elastic deformation, axial micro-cracking and compaction. The peak AE rate is increasing with the plastic strain, which indicates that using the axial plastic strain as the internal damage variable to represent rock damage is reasonable.

scholarly journals Experimental Study on the Effects of Stress Variations on the Permeability of Feldspar-Quartz Sandstone

Geofluids ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Fugang Wang ◽  
Zhaoxu Mi ◽  
Zhaojun Sun ◽  
Xufeng Li ◽  
Tianshan Lan ◽  
...  
Keyword(s):  
Injection Pressure ◽  
Confining Pressure ◽  
Repeated Loading ◽  
Micropore Structure ◽  
Injection Process ◽  
Reservoir Permeability ◽  
Stress Changes ◽  
Cyclic Variations ◽  
Loading And Unloading ◽  
Stress Variations

The multistage and discontinuous nature of the injection process used in the geological storage of CO2 causes reservoirs to experience repeated loading and unloading. The reservoir permeability changes caused by this phenomenon directly impact the CO2 injection process and the process of CO2 migration in the reservoirs. Through laboratory experiments, variations in the permeability of sandstone in the Liujiagou formation of the Ordos CO2 capture and storage (CCS) demonstration project were analyzed using cyclic variations in injection pressure and confining pressure and multistage loading and unloading. The variation in the micropore structure and its influence on the permeability were analyzed based on micropore structure tests. In addition, the effects of multiple stress changes on the permeability of the same type of rock with different clay minerals content were also analyzed. More attention should be devoted to the influence of pressure variations on permeability in evaluations of storage potential and studies of CO2 migration in reservoirs in CCS engineering.

scholarly journals Hydraulic properties and energy dissipation of deep hard rock under H-M coupling and cycling loads

2019 ◽  
Vol 23 (Suppl. 3) ◽  
pp. 935-942 ◽  
Author(s):  
Cheng-Han Zhang ◽  
Shuang You ◽  
Hong-Guang Ji ◽  
Fei Li ◽  
Hong-Tao Wang
Keyword(s):  
Acoustic Emission ◽  
Osmotic Pressure ◽  
Hydraulic Properties ◽  
Coupling Effect ◽  
High Stress ◽  
Confining Pressure ◽  
In Situ Stress ◽  
Dissipated Energy ◽  
Underground Engineering ◽  
Loading And Unloading

The permeability of deep rock is closely related to the stability and safety of underground engineering. The rocks in deep stratum are mostly with high stress and high osmotic pressure. Therefore, it is necessary to consider the coupling effect between porewater pressure and in situ stress on rock mass. A series of triaxial cyclic loading and unloading experiments under hydraulic-mechanics coupling conditions are carried out to studied the mechanical and hydraulic properties of granite in the depth of 1300 m to 1500 m. Especially, the effect of the disturbance on the permeability of fractured rocks are investigated by unloaded the confining pressure. Tests results presented that the stress-strain curves of deep granite showed typical brittle characteristics. The principal stress of granite exhibited a linear relationship under the high confining pressure of 34-40 MPa and high osmotic pressure of 13-15 MPa. Dissipated energy of the rock decreased to a relatively low level after 2-3 loading cycles and then slowly increased. Permeability showed a decreasing trend as the loading and unloading cycles increase. Finally, acoustic emission technology was used to monitor the fracture evolution in rocks, the acoustic emission signal released as the fractures develop and energy dissipated. The results would provide basic data for the exploitation and excavation in the deep galleries.

scholarly journals Damage and fractal evolution trends of sandstones under constant-amplitude and tiered cyclic loading and unloading based on acoustic emission

2019 ◽  
Vol 15 (7) ◽  
pp. 155014771986102
Author(s):  
Dongxu Liang ◽  
Nong Zhang ◽  
Lixiang Xie ◽  
Guangming Zhao ◽  
Deyu Qian
Keyword(s):  
Acoustic Emission ◽  
Cyclic Loading ◽  
Damage Evolution ◽  
Damage Accumulation ◽  
Fractal Dimensions ◽  
Damage Variable ◽  
Constant Amplitude ◽  
Kaiser Effect ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading

It is of significance to study the damage and destruction of rock under cyclic loading in geotechnical engineering. We determined the trends in damage evolution of sandstone under constant-amplitude and tiered cyclic loading and unloading under uniaxial compression. The results of the study show that (1) the variation of acoustic-emission events was consistent with the stress curves and 89% of all acoustic-emission events occurred during the cycling stages. The observed Kaiser effect was more notable in tiered cycling. (2) The damage variable increased sharply in the cycling stages and its increment was 0.07 higher for tiered cycling than constant-amplitude cycling. Sandstone exhibited greater damage under tiered cyclic loading and unloading. (3) Equations for the evolution of the damage variable under the two cycle modes were obtained by fitting of experimental data. (4) The fractal dimensions of the constant-amplitude cycle were larger than those of the tiered cycle. The process of damage and destruction presents a trend of reducing fractal dimension. The damage accumulation of sandstone under tiered cycling was faster than under constant-amplitude cycling. These results provide references for damage and early warning of rock under both constant-amplitude and tiered cyclic loading and unloading.

Creep and Long-Term Strength of Molybdenum Alloy

2016 ◽  
Vol 843 ◽  
pp. 28-33
Author(s):  
S.P. Samoilov ◽  
A.O. Cherniavsky
Keyword(s):  
Tensile Strength ◽  
Plastic Strain ◽  
Strain Curve ◽  
Type Equation ◽  
Monotonic Loading ◽  
Molybdenum Alloy ◽  
Repeated Loading ◽  
Temperature Application ◽  
Term Creep

Mechanical behavior of a molybdenum alloy for high-temperature application was investigated at monotonic loading up to fracture, stress-and strain-controlled cyclic loading and short-term creep (less than 9 hours) under the temperatures from 293 to 1773 K using Gleeble-3800 physical simulator. The tests show that plastic strain corresponding to the tensile strength of the material under monotonic loading is small enough (<1%) whereas residual plastic strain after fracture exceeds by 50%. Repeated loading decreases the tensile strength and yield stress, but increases stable (rising) part of stress-strain curve. Increase in the test temperature leads to the change in fracture type from ductile to quasi-brittle distributed at a temperature above 1673 K. Under relatively low temperatures the rheological properties of the material depend strongly on the material processing history. Obtained creep data allows putting up a thermo-activational type equation used to calculate the steady creep rate. Coupling with the known Hoff's model for the creep prefracture stage, this equations allow not only strain rate but also adequate estimation of fracture time.

EVALUATION OF FRACTURE IN CONCRETE WITH RECYCLED AGGREGATE BY ACOUSTIC EMISSION

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3652-3657
Author(s):  
SAYAKA NISHIBATA ◽  
TAKESHI WATANABE ◽  
CHIKANORI HASHIMORO ◽  
KIYOSHI KOHNO
Keyword(s):  
Acoustic Emission ◽  
Fracture Behavior ◽  
Average Frequency ◽  
Recycled Aggregate ◽  
Recycled Aggregates ◽  
Repeated Loading ◽  
Uniaxial Compression Test ◽  
Adhesion Properties ◽  
Propagation Of Elastic Waves ◽  
Non Destructive

This research revealed fracture behavior of concrete in using recycled aggregates by Acoustic Emission as one of the Non-destructive Inspection. The phenomenon of acoustic emission (AE) is the propagation of elastic waves generated from a source, known as a micro-crack in an elastic material. There were taken to use low-treated recycled aggregate, crushed returned ready mixed concrete for aggregate and normal aggregate. Examination measured AE under the uniaxial compression test. The condition of load is repeated loading. As a result, fracture behavior due to low treated recycled aggregate was detected by AE. It is clarified that AE of concrete with low treated recycled aggregate appeared in low stress level. It has been understood that difference of aggregates becomes clear from Kaiser effect in repeated loading. In relation between RA value and average frequency, it has been understood the adhesion properties of the cement paste in recycled aggregate are appreciable.

scholarly journals Нарушение эффекта Кайзера при нагружении эвтектических сплавов сиcтемы Pb-Sn

2020 ◽  
Vol 46 (18) ◽  
pp. 12
Author(s):  
Д.С. Салита ◽  
В.В. Поляков
Keyword(s):  
Acoustic Emission ◽  
Plastic Flow ◽  
Memory Effect ◽  
Mechanical Loading ◽  
Beta Phase ◽  
Repeated Loading ◽  
Kaiser Effect

This paper investigates acoustic emission under mechanical loading of Pb-Sn alloys. It is revealed that the Kaiser effect under repeated loading is not observed when certain concentrations of constituents lead to establishment of eutectic structures. The absence of acoustic emission memory effect in eutectic Pb alloys is explained. The proposed explanation is based on peculiar features of plastic flow caused by the motion of eutectic alpha- and beta-phase colonies at the joint interfaces.

scholarly journals Research on Coal Mechanical Properties Based on True Triaxial Loading and Unloading Experiment

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yanyan Peng ◽  
Haoxiang Deng ◽  
Minghong Xing ◽  
Pengfei Guo ◽  
Chun Zhu
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Principal Stress ◽  
Coal Mine ◽  
Test System ◽  
Intermediate Principal Stress ◽  
Mine Safety ◽  
Triaxial Loading ◽  
True Triaxial ◽  
Loading And Unloading

To study the safety issues caused by coal mine excavation, self-developed simulation of earth interior atmosphere and sound test system was used to perform true triaxial loading and unloading tests of coal. An acoustic emission detection system was used to record the damage evolution trend of coal under different intermediate principal stress states. The experimental results show that in the true triaxial unloading test, as the intermediate principal stress increases, the failure state of coal changes from shear failure to partial shear tension failure, finally leading to overall yield failure. In the stress-strain curves, with the increase in intermediate principal stress, the strain in the direction of intermediate principal stress gradually changes from compression to expansion, and typical expansion occurs. The Mogi–Coulomb strength criterion better reflects the strength failure characteristics of coal during unloading. The stress-acoustic emission diagrams show that the increase in intermediate principal stress causes the internal cracks of the coal to grow unsteadily and exponentially, and the increase in intermediate principal stress makes the coal lose its ability to continue to bear the load. Studying the influence of the intermediate principal stress on the mechanical properties of coal has practical significance for coal mine safety production.

Sign in / Sign up

Export Citation Format

Share Document