Experimental Study on Anisotropy of Strength, Deformation and Damage Evolution of Contact Zone Composite Rock with DIC and AE Techniques

Wang, Weiqi; Ye, Yicheng; Wang, Qihu; Hu, Ning

doi:10.1007/s00603-021-02682-x

Cited by 23 publications

(8 citation statements)

References 63 publications

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“…Before the loading test, choose the undamaged sample, grind both ends of it flat, and the fine particles on the surface were removed. The stress loading mode was used to slowly load to 0.1kN, and then the displacement loading mode was used to load the sample to failure, and the loading rate was 0.002 mm/s (Wang et al 2021). A total of 4 probes are used in the experiment, 2 at the upper and 2 at the lower ends of the specimens.…”

Section: Experimental Equipment and Processmentioning

confidence: 99%

Deformation failure and acoustic emission characteristics of continuous graded waste rock cemented backfill under uniaxial compression

Guan

Yao

et al. 2022

Environ Sci Pollut Res

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In order to study the effect of aggregate particle size on damage and failure of cemented backfill, uniaxial compression tests were carried out on waste rock cemented backfill with different Talbol particle size gradations using YZW-30A rock direct shearing instrument. The characteristic parameters of acoustic emission (AE) of the specimens during loading process were monitored, and the damage evolution and failure mode of waste rock cemented backfill with different particle size gradations were discussed. The results show that：With the increase of Talbol particle size gradation index n, the uniaxial compressive strength of backfill body first increased and then decreased, and the failure mode of backfill body gradually changed from shear failure to tensile failure. The cracks on the surface of specimens are more and damage is more serious with the increase of the gradation index n. With the increase of the Talbol gradation index n, AE energy rate is more active, and the cumulative AE energy rate is higher. The AE energy rate increases rapidly in the plastic development stage, and reaches maximum value before and after the peak stress, which can be used as the precursor to judge the failure of waste rock cemented backfill. According to the test results, the damage model and constitutive equations of waste rock cemented backfill with different Talbol particle size gradations are established, which can provide engineering guidance for filling mined-out areas with waste rock to ensure safe production of mines.

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Section: Experimental Equipment and Processmentioning

confidence: 99%

Deformation failure and acoustic emission characteristics of continuous graded waste rock cemented backfill under uniaxial compression

Guan

Yao

et al. 2022

Environ Sci Pollut Res

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“…The composite rock mass is a naturally layered material composed of various properties, thicknesses, and components in different combinations in a certain order. The mechanical properties of layered composite rocks are significantly different from those of single homogeneous rocks 4 . Owing to the addition of soft rock, the loading conditions in the layered rock are changed.…”

Section: Introductionmentioning

confidence: 95%

The law of blast stress wave propagation and fracture development in soft and hard composite rock

Ding

Yang

Zhou

et al. 2022

Sci Rep

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The process of blasting stress wave propagation and crack propagation is directly affected by the physical properties of the rock mass and internal joints in the rock. In soft and hard rock layers, the blasting process is more complicated since the blasting stress wave needs to penetrate two kinds of rocks with different physical properties and the interface between soft rock and hard rock. In this study, the modal transformation of stress waves at the interface of layered composite rock was analyzed, and the process was reproduced by finite element analysis. Furthermore, the development law of cracks was explored. The research results demonstrated that in the single blasting-hole model, a triangular crack area caused by reflected stress waves appeared at the rock interface of rock medium I near the blast hole. In rock medium II, the tensile crack generated by the interface wave appeared on the side away from the blast hole. Besides, the development of the tensile crack was associated with the incident mode of the blast stress wave and the incident angle. In the deep hole blasting model, the incidence of the detonation wave front from hard rock to soft rock promoted the fragmentation of the hard rock.

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“…Layered composite rock masses with multiple parallel joints are present in many natural strata 1–4 . When the stress wave propagates through the layered composite rock masses, the wave not only undergoes direct transmission but also undergoes multiple reflections between parallel joints 5–8 .…”

Section: Introductionmentioning

confidence: 99%

The effects of joint spacing on transmission characteristics of stress waves through layered composite rock masses

Fan,

Shi,

Wang

et al. 2023

Num Anal Meth Geomechanics

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The effects of joint spacing on the transmission characteristics of stress waves through layered composite rock masses were investigated. First, a model of layered composite rock masses containing multiple parallel joints with different media in front of and behind the joints was introduced to study multiple reflections between joints. Second, wave transmission through layered composite rock masses was investigated and compared with wave transmission through traditional layered homogeneous rock masses. Finally, the effects of joint spacing and wave impedance ratio on particle velocity transmission coefficient were discussed. The results indicate that for wave propagation through rock masses with the same joint spacing, the onset time and amplitude of the transmitted wave in layered composite rock masses are smaller than those in layered homogeneous rock masses. For wave transmission through rock masses with the same nondimensional joint spacing, the onset time of the transmitted wave in the layered composite rock masses is similar to that in the layered homogeneous rock masses, while the amplitude of the transmitted wave in the layered composite rock masses is smaller than that in the layered homogeneous rock masses. In addition, the particle velocity transmission coefficient first increases and then decreases to be constant as the joint spacing increases, while it continues to increase as the wave impedance ratio increases for wave transmission through both layered composite rock masses and layered homogeneous rock masses.

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Experimental Study on Anisotropy of Strength, Deformation and Damage Evolution of Contact Zone Composite Rock with DIC and AE Techniques

Cited by 23 publications

References 63 publications

Deformation failure and acoustic emission characteristics of continuous graded waste rock cemented backfill under uniaxial compression

Deformation failure and acoustic emission characteristics of continuous graded waste rock cemented backfill under uniaxial compression

The law of blast stress wave propagation and fracture development in soft and hard composite rock

The effects of joint spacing on transmission characteristics of stress waves through layered composite rock masses

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