Fracture properties of jointed rock infilled with mortar under uniaxial compression

Zhong, Zhibin; Deng, Ran; Jin, Zhangdong; Hu, Xiao

doi:10.1016/j.engfracmech.2019.106822

Cited by 31 publications

(18 citation statements)

References 46 publications

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“…Cracks and macrocracks in rock mass have a noticeable impact on the strength and stability of surrounding rocks, especially on the construction and service safety of underground engineering [1][2][3][4][5]; thus, it is particularly important to study the deformation and failure mechanism of fractured rock. To date, some researchers have conducted substantial basic research on fractured sandstone, analyzing the influence of crack shape [6], crack length [7], crack angle [8], and crack location [9], on the deformation and failure characteristics of rock. Some achievements have been obtained, but most of these have been confined to the analysis of experimental phenomena, so the mechanisms of deformation and failure require further study.…”

Section: Introductionmentioning

confidence: 99%

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Yao

Liu

et al. 2022

Energies

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To explore the influence of crack angle on the mechanical properties, energy evolution, and damage evolution of sandstone, uniaxial loading tests were conducted on sandstones with different crack angles. Through the stress–strain curve, the influence of the crack angle on the mechanical properties was analyzed. Based on energy theories and principles, the influence of crack angle on the energy conversion mechanism was analyzed. Based on crack angle and dissipated energy, a damage model considering the initial damage to the fractured sandstones was established. The following conclusions were drawn: (1) The strength and elastic modulus of sandstone decrease with an increase in crack angle, and Poisson’s ratio increases with an increase in crack angle; prefabricated cracks affect the crack initiation position, and accelerate the formation of fracture surfaces. (2) The stress–strain curve was divided into compaction stage, elastic stage, yield stage, and failure stage. The larger the crack angle, the longer the yield stage and the shorter the failure stage. (3) At the peak point, the elastic energy, dissipated energy, and input energy of fractured sandstone always decrease with an increase in crack angle; the energy consumption ratio increases with an increase in crack angle; and the energy storage ratio decreases with an increase in crack angle. (4) The damage variable shows a trend of slow accumulation–steady accumulation–rapid accumulation; the crack angle affects the initial damage of the specimen, and the dissipated energy affects the variation trend of the damage variable.

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Section: Introductionmentioning

confidence: 99%

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Yao

Liu

et al. 2022

Energies

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“…Having high mechanical properties when completely cured as well as low viscosity, which enables it to penetrate into the finest seams, cracks, and pores in soils and fill them homogeneously, along with undisputed adhesion capability, makes grouting a unique strategy to increase the performance of geotechnical structures [ 8 , 9 , 10 , 11 ]. Cement has been used as the base material in grout mixtures for a long time due to ease in accessibility and price efficiency in addition to its convenient post-curing strength [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. However, despite the beneficial traits cement-based grouts provide, there are a few considerable drawbacks that do not allow cement grouts to be applied in every situation.…”

Section: Introductionmentioning

confidence: 99%

“…However, despite the beneficial traits cement-based grouts provide, there are a few considerable drawbacks that do not allow cement grouts to be applied in every situation. For instance, cement grouts could not be used when extremely fine soils like silts are to be treated since cement particles may not infiltrate the soil fine pores or while inclined cracks or joints in rock or concrete need to be filled, though gravity would force the mixture to creep out [ 10 , 15 , 19 , 20 ]. Chemical compounds have also been employed for grouting purposes to overcome the defects experienced with cement [ 19 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effects of Cement and Polymer Grouting on the Shear Behavior of Rock Joints

et al. 2022

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This study carried out a comparison between cement grouting and chemical grouting, using epoxy and polyurethane, with respect to their effects on the shear behavior of joints. Joint replicas, with three different grades of surface roughness, were molded and grouted by means of cement and epoxy grouts of various mixtures. To investigate their shear behavior, samples were subjected to direct shear tests under constant normal load (CNL) condition. According to the results obtained, grouting improves the overall shear strength of the rock joints. All the grouted samples yielded higher maximum and residual shear strength in comparison with the non-grouted joint. Grouting resulted in an improvement in the cohesion of all the samples. However, a fall in friction angle by 5.26° in the sample with JRC of nine was observed, yet it was reduced by 2.36° and 3.26° for joints with JRC of 14 and 19, respectively. Cement grouts were found to have a more brittle behavior, whereas the chemical grouts were more ductile. Higher amounts of cement used in the grout mixture do not provide as much cohesion and only increase the brittleness of the grout. As a result of being more brittle, cement grout breaks into small pieces and joint planes are in better contact during shearing; consequently, there would be less of a fall in friction angle as opposed to epoxy grout whose ductile characteristic prevents grout chipping; therefore, joint planes are not in contact and a greater fall in the friction angle occurs. There was no noticeable change in the cohesion of the larger grouted joints. However, the friction angle of both natural and grouted joints increased in the larger joint. This can be related to the distribution of random peaks and valleys on the joint surface, which increases with the joint size.

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“…To our knowledge, research on the compressive behavior of grouted rock with a bi-directional penetrating crack is rare. Zhibin et al [23] analyzed fracture properties of grouted rock with bi-directional penetrating crack (as shown in Figure 2) under uniaxial compression. In Zhibin's research, the angle between crack and principal stress and crack width were not considered.…”

Section: Introductionmentioning

confidence: 99%

“…The uniaxial compression tests were carried out to analyze the failure mode and compression strength of the grouted rock with the change of the crack type, so as to provide reference for the design and construction of grouting reinforcement in underground engineering. Samples with bidirectional crack [23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Compression Behavior of Grouted Rock with Bi-Directional Penetrating Crack

et al. 2021

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Grouting is a common method of reinforcing fractured rock mass. The mechanical property of grouted rock is a major aspect of the reinforcement effect, which depends on the geometry of the crack, the angle (β) between the load direction and the crack, and other factors. Few studies have focused on grouted rock with bi-directional crack which can reflect well the grouting reinforcement in the stratum with developed fractures. To explore the grouting effect on fractured rock mass, uniaxial compression tests were carried out on grouted rock samples with different bidirectional widths (t) and angles cracks. The results showed that: (1) when the β was 30°, the failure mode was sliding along the interface of rock and grout, when the β was 45°, the failure mode was composite failure mode, and when the β was 0°, 60°, or 90°, the failure mode was typical intact rock failure mode; (2) when the β increased from 0° to 90°, the uniaxial compressive strength (UCS) decreased and then increased again; (3) when the β was 30°, the UCS had nothing to do with the grout thickness, and when the β was not 30°, the greater the grout thickness, the greater the compressive strength and the ultimate energy storage capacity. The test results can provide reference for grouting reinforcement construction and design in the underground excavation process.

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Fracture properties of jointed rock infilled with mortar under uniaxial compression

Cited by 31 publications

References 46 publications

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Investigating the Effects of Cement and Polymer Grouting on the Shear Behavior of Rock Joints

Experimental Study on the Compression Behavior of Grouted Rock with Bi-Directional Penetrating Crack

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