Stress Evolution in Punch-Through Shear Tests: A Numerical Study Based on Discrete Element Method

Liu, Jie; Wan, Wen; Zhao, Yanlin; Fan, Xiang

doi:10.3389/fphy.2020.00327

Cited by 5 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is of great significance for predicting the residual strength of rocks in acidic environments. After immersing granite samples with different pH values, Liu et al [52] reached a similar conclusion through the uniaxial compression tests.…”

Section: Effect Of Acidification Time On the Strength And Deformationmentioning

confidence: 63%

“…The stronger and faster reaction was caused by the higher concentration of H + in the solution [52,53]. It can be further concluded that stronger acidity led to the destruction of more micro-structures.…”

Section: Mass Damage After Acidificationmentioning

confidence: 88%

“…The time scale refers to the ratio of the amount of H + substances consumed per unit time for two solutions with different initial pH values [52,54]. Assuming that under a strongly acidic solution, the amount of H + substances consumed per unit time is Δn 1 , and that in weak acid is Δn 2 , the time scale ƞ(t) of two different acidic solutions can be defined as:…”

Section: Calculation Of Time Scalementioning

confidence: 99%

See 2 more Smart Citations

Aging Features and Strength Model of Diorite’s Damage Considering Acidization

et al. 2020

Self Cite

View full text Add to dashboard Cite

Acidic fluids will cause rock erosion and further endanger the safety of rock engineering. To explore the aging characteristics of the mechanical damage under acid condition, diorite specimens were saturated in neutral water and acid solutions with pH values of 3 and 5 for 49 days. The masses and sizes of the specimens and the pH values of the acidic solution were tracked and measured. Besides, the specimens before and after saturations were observed by an electron microscope scanner. Meanwhile, triaxial compression tests were carried out under neutral water, pH 5 and pH 3 hydrochloric acid solutions, respectively. The mass damage features and mechanical properties of diorite specimens saturated in solutions with different pH values were analyzed. The results show: 1) after acidic saturation, the original lamellar structures and crystal forms were spongy or flocculent. The structure loosened and the boundary between layers became fuzzy. Meanwhile, the number of micro-cracks and micro-pores increased, which weakened the macro-mechanical performances of diorite; 2) the acid condition with pH value of 3 could be used to simulate the long-term effect of the weakly acidic environment in nature; 3) internal friction angle of diorite was more sensitive to acidic solutions than its cohesion; 4) at the initial stage of saturation, diorite broke rapidly. With increasing saturation time, the damage rate slowed down and finally stabilized. The established damage strength model considering acidification could properly describe the test results.

show abstract

Section: Effect Of Acidification Time On the Strength And Deformationmentioning

confidence: 63%

Section: Mass Damage After Acidificationmentioning

confidence: 88%

Section: Calculation Of Time Scalementioning

confidence: 99%

See 1 more Smart Citation

Aging Features and Strength Model of Diorite’s Damage Considering Acidization

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…e flat-joint model can properly simulate the fracture process of rock and rock-like materials [30,31]. In the flat-joint model, tension bond breakages occur when the normal stress between particles exceeds the tensile strength.…”

Section: Numerical Preparationmentioning

confidence: 99%

The Influence of Loading Rate on Direct and Indirect Tensile Strengths: Laboratory and Numerical Methods

Liu

Jiang

Liu

et al. 2021

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

To investigate different responses of direct and indirect tensile strengths to loading rate, direct and indirect tension tests were performed on sandstone, rust stone, and granite specimens. Typical load curves indicate that a peak tensile stress frequently appears before the second peak stress, used to calculate the tensile strength in indirect tension tests. As expected, increase in the loading rate increases the tensile strength. In addition, the calculated tensile strengths of the indirect tension tests are frequently higher. Interestingly, the increase ratio of the tensile strength with the increase in the loading rate in indirect tension tests is higher. To verify the above results, crack propagation and stress evolution in direct and indirect tension tests were dynamically monitored using PFC 3D. For direct tension tests, specimens fail at the peak tension point, corresponding to the tensile strength. However, for indirect tension tests, minor cracks, composing of continuous microcracks, form before the peak stress and accompany with the decreased slope of the compression curve. At the peak point, tensile stresses significantly concentrate at the crack tips and further cause large-scale crack propagation. In addition, the initiation stress instead of the peak tensile stress is closer to the tensile strength, obtained from the direct tests for the same loading rate.

show abstract

“…As a filling structure beside the roadway, ordinary concrete has the advantages of high final setting strength, low labor intensity, low cost, and making full use of gangue to reduce the discharge of gangue, but it has the disadvantages of long initial setting time and low initial strength [18]. In terms of surrounding rock deformation, the surrounding rock of gob-side entry retaining in deep mine has the characteristics of rapid deformation, large deformation, and long-term rheological deformation, which is an important reason for the difficulty of retaining roadway along goaf in deep mine [19,20]. erefore, scholars at home and abroad have done a lot of research on surrounding rock control of gob-side entry retaining in deep mine.…”

Section: Introductionmentioning

confidence: 99%

A Case Study on Gob‐Side Entry Retaining Technology in the Deep Coal Mine of Xinjulong, China

Wang

Ding

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Through the analysis of the project of gob-side entry retaining in the deep gangue filling 2305S-2# working face of the Xinjulong coal mine, the principle and technology of surrounding rock control of gob-side entry retaining along the deep mining face are discussed. It is found that the use of gangue to fill the goaf of the deep mining face can effectively alleviate the occurrence of violent strata pressure, which is the basis for realizing entry retaining along the goaf. In the Xinjulong coal mine, the gangue wall and concrete-filled steel tube columns are used as roadside support structure. Anchor bolt + W steel belt are used as advance support, monomer column + hinged beam are used as temporary support, and long anchor cable + beam are used as permanent support. Gob-side entry retaining of deep mining working face is successfully realized. The actual measurement results show that the bearing capacity of gangue wall increases slowly, and the deformation is large. The concrete-filled steel tube column has a certain drilling bottom, and the roof cable is easily broken on the side of the remaining roadway. It is necessary to strengthen the lateral constraint of the gangue wall, limit the deformation of the gangue wall, and improve the bearing capacity of the gangue wall. The bottom of the concrete-filled steel tube column needs to be installed with a large backing plate to control the bottom drilling amount, and the roof anchor cable of the roadway must have a certain elongation to realize the coordinated deformation of the anchor cable and the roof.

show abstract

Stress Evolution in Punch-Through Shear Tests: A Numerical Study Based on Discrete Element Method

Cited by 5 publications

References 33 publications

Aging Features and Strength Model of Diorite’s Damage Considering Acidization

Aging Features and Strength Model of Diorite’s Damage Considering Acidization

The Influence of Loading Rate on Direct and Indirect Tensile Strengths: Laboratory and Numerical Methods

A Case Study on Gob‐Side Entry Retaining Technology in the Deep Coal Mine of Xinjulong, China

Contact Info

Product

Resources

About