Spatial Propagation Effects of 3D Cracks on Mechanical Properties of Geomaterials Under Uniaxial Compression by 3D Reconstruction

Zhao, Zhi; Zhou, Xiaoping; Qi, Qian

doi:10.1007/s00603-022-03033-0

Cited by 8 publications

(7 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liu, Zhixiang, Zhao, Shuguo, and others [37,38] corrected the damage model of ordinary tailing sand cemented filling, but the results were unsatisfactory. Zhao Kang et al [5] introduced the correction coefficient α into the damage model, which is more suitable for fiber-doped fillers. Since the fiber-doped filling body still has residual strength in the post-peak damage stage and has not completely lost its load-bearing capacity, it is necessary to study its post-peak strength characteristics and the post-peak load-bearing characteristics of the fiber-doped tailing sand cemented filling body is the basis for determining its filling strength.…”

Section: Damage Modeling Ofmentioning

confidence: 99%

“…For example, Mitchell et al [3] proposed the first application of fibers to mine backfill, and they found that the addition of fibers increased the unconfined compressive strength (UCS) of the backfill and reduced the cement content; Chen et al [4] explored the effect of PP fibers on the UCS and microstructural properties of cement tailing slurry. They found that the effect of fiber content on cement tailing slurry was considered to be higher than that of fiber length; Zhao et al [5] carried out a study on the early mechanical properties and damage constitutive model of tailing sand filler under the action of different fibers, and the results showed that the enhancement effect of mixed fibers on the mechanical properties of tailing sand filler was better than that of single fiber; Hou et al [6] investigated the effect of fiber and rice husk ash on the performance of ultrafine tailing sand cemented filler, the results show that the appropriate amount of fiber and rice husk ash can effectively inhibit the destruction of ultrafine tailing sand filler specimens and improve its compressive strength. ; YI et al [7] studied the influence of PP fibers on the UCS of the filling.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Properties and Energy Damage Evolution Mechanism of Basalt Fiber-Modified Tailing Sand Cementation and Filling Body Mechanics

Chen,

Zhang

2024

Buildings

View full text Add to dashboard Cite

In order to investigate the mechanical properties of basalt fiber-doped tailing sand cemented filler and the evolution of energy damage, a uniaxial compression test was carried out on the basalt fiber-doped tailing sand cemented filler specimens to analyze the energy dissipation characteristics, and the damage constitutive equations with different basalt fiber contents were established based on damage mechanics. The results show that with the increase of fiber doping and fiber length, the uniaxial compressive strength and ductility of the filling body show a trend of increasing and then decreasing; the optimal value of fiber doping is 0.6%, and the optimal value of fiber length is 9 mm; the total strain energy, elastic strain energy and dissipation energy of basalt fiber-modified tailing sand cemented filling body at peak stress show a trend of increasing and then decreasing, and the energy dissipation energy of the filling body shows a trend of increasing and then decreasing. The energy dissipation energy shows a trend of increasing and then decreasing, and the energy dissipation energy shows a trend of increasing and then decreasing. The total strain energy, elastic strain energy, and dissipation energy at the peak stress show a trend of decreasing after increasing with the fiber doping and fiber length, and the energy damage evolution process can be divided into four stages: no damage stage, stable damage development stage, accelerated damage growth stage, and damage destruction; in addition, the existing damage constitutive model of the fiber-filled body was optimized, and the damage correction factor was introduced to obtain the damage constitutive model of the filled body with different fiber contents, and finally, after the verification of experimental and theoretical models, it was found that the two stress–strain curves coincided well. Finally, after the test and theoretical model verification, it is found that the stress–strain curves of the two are in good agreement, which indicates that the established theoretical model has a certain reference value for engineering practice, and at the same time, it has certain limitations.

show abstract

Section: Damage Modeling Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Energy Damage Evolution Mechanism of Basalt Fiber-Modified Tailing Sand Cementation and Filling Body Mechanics

Chen,

Zhang

2024

Buildings

View full text Add to dashboard Cite

show abstract

“…Zhao et al conducted an experimental study on the effect of three-dimensional roughness of rock fractures on seepage characteristics by means of the DIC method [25]. In addition, the evolution characteristics of rock deformation and damage from the mesoscopic level also could be found by the DIC method, as reported by [26].…”

Section: Introductionmentioning

confidence: 98%

Coupling Study of Deformation Field Evolution and Acoustic Emission Response Characteristics in Rock Failure and Instability Process

Zhu

Zhang

et al. 2022

Sustainability

View full text Add to dashboard Cite

During rock failure and instability, cracks usually appear as microcracks in local areas and then expand into significant macroscopic cracks. In this study, the whole process of rock deformation and instability under uniaxial loading is investigated with standard rock specimens, and acoustic emission (AE) and digital image correlation (DIC) technology are introduced to explore the process of rock failure and instability. AE technology is used to identify the location of crack propagation caused by microcracks and large cracks, and DIC is used to measure the crack propagation at different locations. Results show that the evolution of accumulated energy is closely related to the change in stress. When the specimen approaches failure, a “y” shaped localization zone is formed, and the evolution path is consistent with the through-through path of the crack, which better reflects the propagation law of the crack in the rock. The spatial distribution of the AE location event and energy density is consistent with the evolution path of the localization zone. The deformation value of the deformation field is closely related to the initiation and evolution of the deformation localization zone. On the basis of density-based spatial clustering of applications with a noise-clustering algorithm, AE positioning events are further processed and projected into the digital image of the deformation field, and the results of clustering projection are in good agreement with the deformation localization zone. Results show that AE and DIC coupling localization techniques can effectively identify the fracture process zone and fracture mechanism of rock, providing a new technical means for further studying the mechanical properties of rock materials.

show abstract

“…By capturing the displacement field around a crack tip in rocks, DIC enables dynamic observations. Zhao et al [5][6] used DIC technology to conduct macro-and micro-multiscale studies on the crack propagation process in quasi-rock brittle materials under uniaxial compression, obtaining clear paths of material crack rupture and damage evolution.…”

Section: Introductionmentioning

confidence: 99%

Method for identifying the position of crack tip by displacement distribution based on digital image correlation

Zhao,

Fu,

Xing

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Determining the position of crack tip is crucial for rock fracture characteristic analysis. This study aims to establish a quantitative standard for determining crack tip positions in crystalline rocks based on digital image correlation (DIC). Semi-circular bending (SCB) tests were conducted on four types of rocks under three-point bending. Optical microscopy and DIC were used to investigate characteristics of the horizontal displacement fields around the crack tips. A significant disparity in the displacement gradient was observed across the crack tips, with the internal gradient being approximately 3–5.1 times higher than the external gradient. A critical value ranging from 0.41%–0.64% was determined for the high internal displacement gradient (∂u/∂x) at a 20 pixel resolution equivalent to 1 mm. Furthermore, a novel DIC-based method was proposed that used three patterns of opening displacement gradients to classify SCB specimens into non-cohesive, cohesive, and elastic zones, providing a quantitative determination of Type I crack tip positions. This study offers valuable insights and a crack tip determination method based on DIC gradients, applicable for assessing parameters such as the crack extension length and fracture process zone length.

show abstract

Spatial Propagation Effects of 3D Cracks on Mechanical Properties of Geomaterials Under Uniaxial Compression by 3D Reconstruction

Cited by 8 publications

References 42 publications

Mechanical Properties and Energy Damage Evolution Mechanism of Basalt Fiber-Modified Tailing Sand Cementation and Filling Body Mechanics

Mechanical Properties and Energy Damage Evolution Mechanism of Basalt Fiber-Modified Tailing Sand Cementation and Filling Body Mechanics

Coupling Study of Deformation Field Evolution and Acoustic Emission Response Characteristics in Rock Failure and Instability Process

Method for identifying the position of crack tip by displacement distribution based on digital image correlation

Contact Info

Product

Resources

About