Acoustic emission investigation of cemented paste backfill prepared with tantalum–niobium tailings

Zhao, Kang; Xiang, Yu; Zhu, Shengtang; Zhou, Yun; Wang, Qing; Wang, Junqiang

doi:10.1016/j.conbuildmat.2019.117523

Cited by 60 publications

(11 citation statements)

References 19 publications

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“…e determination of the mechanical strength of rock materials is still confined to the traditional solid mechanics system that takes homogeneous materials such as metals as research objects. Although some new research methods have been reported recently [19,20], some mechanical concepts of traditional solid mechanics are still used, such as the yield criterion of traditional solid mechanics. Among them, the maximum tensile stress criterion is the first theory on the strength of materials under complex stress conditions.…”

Section: Reason For Splitting Failurementioning

confidence: 99%

The Mechanism of Interface Dilatancy of Cement Mortar Rockbolts

Zhan

Wang

et al. 2020

Advances in Civil Engineering

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In this paper, the mechanism of the interface dilatancy of cement mortar rockbolts is studied based on the phenomenon of splitting failure of samples with a high sand content in the grouting material in laboratory tests. A conceptual model of the interface layer is used to explain the dilatancy mechanism of the interface. Based on the thick-walled cylinder theory, the causes of splitting failure of the samples are analyzed. By using the numerical simulation method, the influences of different dilatancy angles of the interface layer on the interface shear stress and the radial stress are analyzed. The results show that the sand content of the grouting material has a substantial effect on the bearing capacity of the rockbolt. The higher the sand content in the grouting material is, the more obvious the interface dilatancy will be, and the greater the radial stress generated by dilatancy will be, which will produce a higher bearing capacity of the anchorage system. Under the same load, the maximum shear stress of the interface layer increases with increasing dilatancy angle. Similarly, the larger the dilatancy angle of the interface layer is, the greater the radial stress caused by dilatancy will be. Away from the interface layer, the radial stress decays rapidly. The influence range of the radial stress caused by dilatancy is mainly in the interface layer and the rock nearby.

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Section: Reason For Splitting Failurementioning

confidence: 99%

The Mechanism of Interface Dilatancy of Cement Mortar Rockbolts

Zhan

Wang

et al. 2020

Advances in Civil Engineering

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“…Gong et al, studied the filling body's acoustic emission and bvalue characteristics under the loading and unloading conditions and discovered the energy evolution distribution law of the filling body during the loading and unloading process [13]. Zhao et al, summarized the relationship between acoustic emission event rate, ringing count rate, and stress time of tantalum-niobium tailings backfill in uniaxial compression and splitting tests and analyzed the stress and acoustic emission characteristics of each stage [14]. Cheng et al, established a prediction model for the strength of cemented tailings backfill, ultrasonic wave velocity, and density of the backfill in the ultrasonic testing and mechanical tests of the cemented tailings backfill and constructed the damage evolution model of cemented tailings backfill [15].…”

Section: Introductionmentioning

confidence: 99%

Study on Acoustic Emission and Coda Wave Characteristics of Layered Cemented Tailings Backfill under Uniaxial Compression

Huang

et al. 2022

Minerals

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The paper analyzes the effects of filling times and filling interval time on the acoustic emission characteristics and coda wave characteristics of layered cemented tailings backfill under uniaxial compression and, to a certain extent, enriches the study of layered cemented tailings backfill in this field. The work aims to monitor the early warning of layered cemented tailings backfill with different layering factors during deformation and damage by the changing law of acoustic emission and ultrasonic signals. By conducting uniaxial compression tests, acoustic emission, and ultrasonic tests of layered cemented tailings backfill, the acoustic emission parameters and their fractal characteristics of layered cemented tailings backfill with different layering factors during uniaxial compression were calculated. Meanwhile, the variation law of the coda wave velocity variation rate of layered cemented tailings backfill during uniaxial loading was analyzed using coda wave interferometry. The test results show the feasibility of using acoustic emission and ultrasonic means to monitor and warn about the deformation damage of layered cemented tailings backfill.

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“…Sun et al [23] studied the relationship between the AE signal and the failure of the backfill and constructed the constitutive damage model of the backfill. Zhao et al [24] studied the relationship between AE event rate, ringing count rate, and stress-time through uniaxial compression and splitting failure tests. Cao et al [25] investigated the compressive strength behavior and AE characteristics of 180-day cured CTB samples by using four different loading rates.…”

Section: Introductionmentioning

confidence: 99%

Study on Backfill Acoustic Emission Characteristics and Source Location under Uniaxial Compressive

Shi

Guo

et al. 2022

Advances in Civil Engineering

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This study investigates the acoustic emission (AE) characteristic of cemented tailings backfill (CTB) under uniaxial compressive loading. A classified tailings material source from Wushan Copper Mine was used to prepare cylindrical CTB samples. This study used an SLB10 loading machine for the uniaxial compressive test. A PCI-2 acoustic wave system was attached to the CTB specimen to measure the acoustic emission during loading. Overall, the backfill specimen’s uniaxial compressive strength (UCS) is 3.58 MPa. The failure modes of the CTB sample could be divided into five stages, including the pore microfracture compacting stage (stage-a), linear elastic deformation stage (stage-b), yield deformation stage (stage-c), failure stage (stage-d), and residual stage (stage-e). At each stage, the AE characteristic parameters such as the hits per second (HPS), the cumulative number of impacts, energy rate, and total energy vary a lot, which indicates the AE parameter reflects the internal failure evolution of the CTB sample. In stage-a, no apparent AE behavior was measured. In Stage-b, there is no evident macroscopic change in the specimen, while the AE parameters steadily and continuously increase. During stage-c, the number of AE impacts grows sharply, the energy rate increases significantly, and changes suddenly. The cumulative number of AE impacts is 31.3% in stage-d, and the cumulative energy rate is 49.4%, which is the most active stage of acoustic emission activities. The specimen has prominent crack propagation and bifurcation phenomena. In stage-d, the CTB sample was destroyed entirely, and the characteristic parameters of acoustic emission were significantly reduced. Finally, multiple regression analysis methods are introduced into the time difference positioning method to locate the AE source. The positioning results show that the technique can better invert the close relationship between the damage and destruction of the CTB and the generation and penetration of the internal cracks and describe it to a certain extent. The failure surface of the filler specimen has an excellent guiding value for the analysis of the interior failure characteristics of the sample.

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Acoustic emission investigation of cemented paste backfill prepared with tantalum–niobium tailings

Cited by 60 publications

References 19 publications

The Mechanism of Interface Dilatancy of Cement Mortar Rockbolts

The Mechanism of Interface Dilatancy of Cement Mortar Rockbolts

Study on Acoustic Emission and Coda Wave Characteristics of Layered Cemented Tailings Backfill under Uniaxial Compression

Study on Backfill Acoustic Emission Characteristics and Source Location under Uniaxial Compressive

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