Numerical Simulation Analysis of NPR Anchorage Monitoring of Bedding Rock Landslide in Open‐Pit Mine

Zhang, Kai; Yang, Xiao‐Jun; Cui, Xuebin; Wang, Yong; Tao, Zhigang

doi:10.1155/2020/8241509

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…A large number of scholars used numerical simulation methods combined with monitoring to conduct research on the stability of open pit slopes and used conventional GNSS, total station monitoring [27,28], etc. ere are few applications for InSAR (synthetic aperture radar jamming) obtaining mine surface deformation data but which is developing more rapidly today in other fields [29][30][31]…”

Section: Introductionmentioning

confidence: 99%

Mine Slope Stability Based on Fusion Technology of InSAR Monitoring and Numerical Simulation

Yuan

et al. 2022

Scientific Programming

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In this paper, the slope of the open pit of Dahongshan iron ore mine in Yunnan is taken as the research object, the safety coefficient and settlement values of the slope under natural and rainfall conditions are derived by the finite element software Midas/GTS, and the surface settlement versus time is produced by fusing the InSAR monitoring results of the study area for a whole year to judge the stability of the open pit slope. The results show that the settlement and deformation areas shown by numerical simulation and InSAR monitoring results are consistent; the comparison between InSAR monitoring results and rainfall intensity shows that the cumulative value of slope settlement has a high correlation with heavy rainfall. The safety coefficients of the slopes of the open pit under natural conditions and rainfall conditions are 1.50 and 1.21, the cumulative value of settlement in InSAR monitoring data for one year is 18.4 mm, and no obvious large deformation area is found. The use of numerical simulation combined with InSAR monitoring can realize the analysis of the stability of the slope of the open pit mine.

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Section: Introductionmentioning

confidence: 99%

Mine Slope Stability Based on Fusion Technology of InSAR Monitoring and Numerical Simulation

Yuan

et al. 2022

Scientific Programming

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“…In view of the limitation of traditional anchor cables with respect to mechanical properties and severe engineering environments, new anchor cables with extraordinary mechanical properties should be developed. Existing NPR anchor cables have solved the deformation problem of deep, soft rock roadways [20,21]. The deformation capacity increases to 3000-4000 mm, and the maximum constant resistance is 567.7-800 kN [22].…”

Section: Introductionmentioning

confidence: 99%

Load Transfer Behavior and Failure Mechanism of Bird’s Nest Anchor Cable Anchoring Structure

2022

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To research the internal load transfer behavior and failure mechanism of a bird’s nest anchor cable anchoring structure based on a pull-out test, a bond-slip failure model is established on the basis of statistical damage theory, and the distribution formula of shear stress at anchorage agent–rock interface is deduced. Combined with theoretical analysis, bird’s nest anchor cable pulling out test and particle flow code (PFC) numerical simulation test, as well as axial force distribution of the cable and shear stress distribution of its interface, help reveal its load transfer behavior and failure mechanism. Results show that: (1) The established bond-slip model can reflect the internal load transfer behavior and failure process of bird’s nest anchor cable anchorage structure. (2) The shear stress of the anchorage agent interface increases exponentially to the peak value and then decreases exponentially to the residual strength. The process is repeated at every location of the anchorage agent interface. The curve of the axial force and shear stress of the bird’s nest anchor cable is a negative exponential distribution with anchorage depth, and the maximum value occurs at the load end. (3) The crack of the anchorage agent interface extends from the load end to the other end and finally cuts through the whole interface. Rock mass generates radial cracks by the split effects of the bird’s nest. The failure mode is a combination of the debonding slip of the interface and the shear failure of the rock mass. The shear stress distribution and failure mode of the anchor structure are basically consistent according to laboratory tests and simulation tests, and PFC2D better reflects the internal load transfer behavior, failure mechanism, and failure process of the bird’s nest anchor cable under tensile loads.

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“…Cao et al [15,16] studied the settlement and deformation of an open-pit mine dump by combining field monitoring data and numerical simulations. Zhang et al [17] analyzed the anchor cable monitoring in the Nanfen open-pit mine and revealed the failure process of a bedding rock landslide and the stress evolution characteristics of negative Poisson's ratio (NPR) cables. Xu and Yan [18] used FLAC 3D to simulate the influence of excavation and blasting vibration on goaf stability.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Steep Rock Slope in a Large Open-Pit Mine in a High-Intensity Area: A Case Study of the Yejiagou Boron Iron Mine

Zhang

2022

Geofluids

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The slope stability of open-pit mines has always been a major problem affecting the safe production of resources from open-pit step mines. At present, slope excavation in open-pit mines is difficult and slope instability problems are becoming increasingly prominent. In this study, an open-pit bench rock slope in Liaoning Province was taken as the research object. The physical parameters of the rock mass in the area were obtained through engineering drilling and large-scale direct shear tests. Based on the determination of the dominant group of the slope’s structural plane, the seepage deformation failure and maximum stress deformation of the slope were analyzed to explore the stability of high and steep rocky slopes in large open-pit mines. The results show that there is a group of dominant structural planes at the no. 1~3 observation points whose dip angle is steep and consistent with the slope inclination. The dip angle is slightly lesser at the slope toe, and the slope is basically a stable structure. The Janbu method was used to calculate the seepage stability of the slope and it is found that section 4-4 is in a dangerous area. In the stress nephogram, the maximum principal stress is located inside the slope, and the minimum principal stress is located at the surface of the free surface.

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Numerical Simulation Analysis of NPR Anchorage Monitoring of Bedding Rock Landslide in Open‐Pit Mine

Cited by 11 publications

References 34 publications

Mine Slope Stability Based on Fusion Technology of InSAR Monitoring and Numerical Simulation

Mine Slope Stability Based on Fusion Technology of InSAR Monitoring and Numerical Simulation

Load Transfer Behavior and Failure Mechanism of Bird’s Nest Anchor Cable Anchoring Structure

Stability Analysis of a Steep Rock Slope in a Large Open-Pit Mine in a High-Intensity Area: A Case Study of the Yejiagou Boron Iron Mine

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