Numerical Simulation of Inner Support for Excavation Based on FEM Software ABAQUS

Sun, Yue; Chen, Yue Nan; Wang, Zhi Yun

doi:10.4028/www.scientific.net/amm.236-237.632

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…FEM is one of the widely used numerical methodologies in engineering because of its flexibility in solving material heterogeneity, nonlinearity. As a well-developed and verified commercial code software, Abaqus is capable to handle numerical models with material complexity, complicated boundary conditions, and dynamic problems, and it is also user-friendly [25]. Since the acceptable constitutive model failure criteria in Abaqus for rock is the Mohr-Coulomb failure criteria [26], so both the 2D and 3D models use the Mohr-Coulomb failure criteria for the simulation calculation.…”

Section: Establishing the Numerical Modellingmentioning

confidence: 99%

Study of the Influence of Backfilling on Stability and Location of Remaining Stopes in Sill Pillar Recovery

Xu¹

2021

GEOMATE

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To extract steeply dipping orebodies, many mines in Canada have adopted the sublevel stoping method, such as blasthole stoping (BHS) and sublevel longhole retreat (SLR). In such methods, sill pillars are initially kept in place to support the weight of the overburden in underground mining. After the stope mining is complete, the stope voids will be backfilled with cemented rockfill (CRF). The strength of the CRF affects the stability of the adjacent stopes in the sill pillar recovery excavation scheme. Sill pillar recovery may cause prolonged failure, fatality, and equipment loss. Choosing a rational location of the last mined stope in sill pillar recovery can effectively eliminate the possible instability caused by the sill pillar recovery process. This paper uses the Finite Element Method (FEM) to present a comparison of sidewall swellings, floor heaves, and the roof subsidence of the crossing cuts in each stope among different last mined stope location scenarios. At all the 21 location scenarios, most of the roof corner displacements in undercuts are less than 10 cm, while in the overcuts, all the displacements in roof corners are over 10 cm. The values of the floor heave in the overcuts are more than 7 times that in the undercuts. Roofs in both undercuts and overcuts are prone to failures. Floors in the undercuts are more stable than the floors in the overcuts. For the optimum location of the last mined stope in sill pillar recovery, the last mined stope should be at least four-stope-width away from the two sill pillar edges.

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Section: Establishing the Numerical Modellingmentioning

confidence: 99%

Study of the Influence of Backfilling on Stability and Location of Remaining Stopes in Sill Pillar Recovery

Xu¹

2021

GEOMATE

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“…It has been proved that full-size 3D models can estimate the deformations of underground openings and explore the mining-induced stress redistribution paths during excavation than 2D models [42][43][44]. Thus, a full-size 3D elastoplastic finite element numerical model was established using the codes of ABAQUS [42][43][44][45][46]. The analysis domain has a size of 1200 m × 1200 m × 700 m (length × width × depth).…”

Section: Numerical Model Configurationmentioning

confidence: 99%

Investigation of Backfilling Step Effects on Stope Stability

Apel

Wang

et al. 2021

Mining

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Cemented rock fill (CRF) is commonly used in cut-and-fill stoping operations in underground mining. This allows for the maximum recovery of ore. Backfilling can improve stope stability in underground workings and then improve ground stability of the whole mine site. However, backfilling step scenarios vary from site to site. This paper presents the investigation of five different backfilling step scenarios and their impacts on the stability of stopes at four different mining levels. A comprehensive comparison of displacements, major principal stress, and Stress Concentration Factor (SCF) was conducted. The results show that different backfilling step scenarios have little influence on the final displacement for displacement in the stopes. Among the five backfilling scenarios, the major principal stress and stress concentration factor (SCF) have almost the same final results. The backfilling scenario SCN-1 is the optimum option among these five backfilling scenarios. It can immediately prevent the increase of the displacement and reduce the sidewall stress concentration, thereby preventing possible failures. Using the same strength of CRF can achieve the same effects among the four mining levels. Applying backfilling CRF of the same strength at different mining depths is acceptable and feasible to improve the stability of the stopes.

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“…Numerical modeling plays a great role in the design and assessment of the rock mass behavior. FEM is perhaps the most widely applied numerical method in engineering today because of its flexibility in handling material heterogeneity, non-linearity and complicated boundary conditions and dynamic problems, with many well developed and verified commercial codes with large capacities in terms of computing power, material complexity and user-friendliness, Sun [22].…”

Section: Numerical Modelling Establishmentmentioning

confidence: 99%