Mechanical Behavior of Rock-Like Specimens with Hidden Smooth Joints under Triaxial Compression

Xiang, Zhipeng; Wang, Huanling; Xu, Weiya; Li, Liangquan; Cai, Ming

doi:10.1061/(asce)mt.1943-5533.0002787

Cited by 15 publications

(3 citation statements)

References 37 publications

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“…Elastic Moduli tests, p-wave Velocity measurements, and Point load determination have found differences in mechanical anisotropy of CJRM in different directions (Fan et al 2017;Sitharam et al 2001). Uniaxial and triaxial monotone loading tests show that the joint dip angle and number of joints affect the nonlinear mechanical behavior and failure modes of CJRM (Ji et al 2017;Xiang et al 2019). Triaxial cyclic load tests reveal that accumulation of irreversible plastic deformation is the main factor of failure of the CJRM specimens (Zhang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Anisotropic Shear Properties of Artificial Columnar Jointed Rock Mass Based on Three-Dimensional Printing Method

tao

2024

Preprint

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The anisotropic shear mechanical characteristics of columnar jointed rock mass (CJRM) were studied. Specimens were taken from the geometric structure of the CJRM of the dam foundation at the Baihetan hydropower station. A water-soluble material was used by three-dimensional printing technology to establish a columnar jointed network structure with different joint dip angles. The CJRM specimens were prepared with rock-like materials. The anisotropy characteristics of CJRM specimens with positive and negative joint dip angles under shear stress were analyzed by direct shear tests, and observed under scanning electron microscopy (SEM). The results show that the anisotropy of CJRM specimens depends on the joint dip angle. The anisotropy degree of the characteristic stresses and peak friction angle of CJRM specimens with positive joint dip angles is greater than that of negative joint dip angles. Four failure modes are observed, depending on the joint dip angle. The research results provide a reference for the anisotropic shear mechanical properties of CJRM in geotechnical engineering.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Anisotropic Shear Properties of Artificial Columnar Jointed Rock Mass Based on Three-Dimensional Printing Method

tao

2024

Preprint

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“…They found that the strength properties of pre-flawed sandstone specimens were closely related to the flaw angle and confining pressure. Xiang et al [10] carried out a series of triaxial compression tests on rock-like specimens with hidden smooth joints under triaxial compression. They found that the presence of hidden joints led to a large strength and deformation modulus reduction of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on biaxial dynamical compressive test and PFC2D numerical simulation of artificial rock sample with single joint

2023

Archives of Civil Engineering

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Dynamic biaxial compression tests and Particle Flow Code numerical simulations of the cement mortar specimens with a single joint were carried out to study the mechanical properties and crack evolution of artificial rock samples with a single joint. The effects of lateral stress 𝜎 2 , loading rate 𝑉 , the dip angle 𝛽 (between the vertical loading direction and the joint) on the biaxial compressive strength 𝜎 𝑏 , and the evolution law of crack were investigated. Test results showed that; (1) when both the dip angle 𝛽 and the loading rate 𝑉 remained unchanged, the biaxial compressive strength 𝜎 𝑏 increased with the increase in the lateral stress 𝜎 2 , while 𝜎 2 had no obvious effect on the crack evolution law;(2) when both the dip angle 𝛽 and the lateral stress 𝜎 2 were kept unchanged, the loading rate 𝑉 had an insignificant effect on the biaxial compressive strength 𝜎 𝑏 and the crack evolution law; (3) when both the lateral stress 𝜎 2 and the loading rate 𝑉 were constant, the biaxial compressive strength 𝜎 𝑏 decreased first and then increased with the increase in the dip angle 𝛽; however, the dip angle 𝛽 did not significantly affect the crack evolution law. The conclusions obtained in this paper are presented for the first time.

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“…At present, a lot of researches have been conducted on the influence of confining pressure on the mechanical properties of jointed rock (Lu et al, 2012;Ghazvinian and Hadei, 2012;Xiang et al, 2019;Tang et al, 2022). For example, Arzuá et al (2014) and Alejano et al (2017) conducted triaxial compression tests on jointed granite samples to study the influence of confining pressure and joint number on the peak strength and elastic modulus of massive jointed rock.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on compressive mechanical characteristics of filled jointed rock under confining pressure based on PFC

Song,

Chai,

et al. 2023

Front. Ecol. Evol.

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Confining pressure is an important factor affecting the strength and deformation characteristics of rock mass, it is of great significance to study the mechanical and deformation characteristics of jointed rock mass under confining pressure for the construction of deep underground engineering and the prevention of geological disasters. In order to study the mechanical and deformation characteristics of filled jointed rock under confining pressure, based on the laboratory experiment results of static uniaxial compression of filled jointed rock samples, the Particle Flow Code is used to conduct the numerical simulation. The strength characteristics, failure characteristics and micro-cracks development characteristics of filled jointed rock under different confining pressure levels, different joint inclination angles and different sample sizes are analyzed. The results show that the peak stress and peak strain increase with the increase of confining pressure level, and there is a strong linear relationship between peak stress and confining pressure level. The peak stress and initiation stress decrease first and then increase with the increase of joint inclination angle. With the increase of confining pressure level, the change law of initiation stress of filled jointed rock under different joint inclination angles is different. The confining pressure will prolong the development process of micro-cracks in filled jointed rock, which will make the distribution of micro-cracks more dispersed and the total number of micro-cracks increase. The failure mode changes from splitting failure to shear failure with the increase of confining pressure level. The change of joint inclination angle will seriously affect the failure mode and micro-cracks development characteristics of filled jointed rock.

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Mechanical Behavior of Rock-Like Specimens with Hidden Smooth Joints under Triaxial Compression

Cited by 15 publications

References 37 publications

Experimental Investigation on Anisotropic Shear Properties of Artificial Columnar Jointed Rock Mass Based on Three-Dimensional Printing Method

Experimental Investigation on Anisotropic Shear Properties of Artificial Columnar Jointed Rock Mass Based on Three-Dimensional Printing Method

Experimental study on biaxial dynamical compressive test and PFC2D numerical simulation of artificial rock sample with single joint

Numerical study on compressive mechanical characteristics of filled jointed rock under confining pressure based on PFC

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