Investigation on the Deformation Law of Inner Waste Dump Slope in an Open‐Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Cao, Bo; Wang, Shuai; Song, Danqing; Du, Han; GUO, Weiqiang

doi:10.1155/2021/9953554

Cited by 4 publications

(3 citation statements)

References 39 publications

(39 reference statements)

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“…In studies [25][26][27][28], researchers have used numerical modeling and simulation techniques to study the internal dump slope stability. Empirical and experimental studies of the internal dump stability are presented in [29,30]. Several researchers have proposed and evaluated stability analysis and internal dump design methods [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Determining the Safe Distance for Mining Equipment Operation When Forming an Internal Dump in a Deep Open Pit

et al. 2023

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In the surface mining of mineral deposits, land resources suitable for agricultural purposes are inappropriately spent in large volumes. When mining deep open pits, overburden rocks are mainly transported to the surface. The optimal solution for reducing the area of disturbed lands is the placement of overburden rocks in internal dumps in the open pit. This is especially suitable when mining a mineral deposit with several open pits where at least one of them is depleted. Therefore, it is important to assess the feasibility of building an internal dump, based on the stability parameters of its slopes and the safe distance for placing mining equipment within its boundaries, which was the focus of this research. Numerical modeling with Slide 5.0 software was used to determine the stability of the dump slope inside the open pit and the safe distance from the upper slope edge for placing mining equipment. This reflected the geomechanical situation occurring within the boundaries of the dump formed in the open-pit field with a high degree of reliability. It was determined that the maximum standard safety factor values of the open-pit slopes are within the limits when the overburden rocks border on the hard bedrock (Ks.s.f ≥ 1.2). Under the condition where the dump slope bordered on sedimentations represented by clays, loams, and sands with a strength of 2–3 on the Mohs scale, the safety factor decreased by 22%. It was determined that the minimum safe distance from the outer contour of the dragline base to the upper edge of a single-tier dump was 15.5 m with a safety factor of 1.21. The maximum safe distance values in the range of 73.5–93 m were concentrated within the boundaries of sections 5–9, with a safety factor from 1.18 to 1.28. When the dragline was located within the boundaries of section 7, the dump construction works should be conducted only if the dump exist for up to 3 years. Based on the identified parameters, on the example of using the ESH-11/70 walking dragline, a technological scheme of its operation was developed with the allocation of safe boundaries for its placement when forming an internal dump. The results obtained are useful for the development of projects for the reclamation of depleted open pits.

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Section: Introductionmentioning

confidence: 99%

Determining the Safe Distance for Mining Equipment Operation When Forming an Internal Dump in a Deep Open Pit

et al. 2023

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“…Chen and Zhang [14] studied the compression response of space variable rock columns with three-dimensional random fields. 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.…”

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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“…Slope failure is an inevitable aspect of economic mine slope design in the mining industry (Neil et al, 2020); large landslides or floor heaves have occurred at the south dump of the Antaibao Openpit Mine, the east dump of the Pingshuo Opencast Mine, the external waste dump at the "South Field" lignite mine, Northern Greece, the Jianshan dump of the Lanjian Iron Mine, etc. due to insufficient bearing capacity of foundations (Steiakakis et al, 2009;Cao et al, 2021;, which is a serious threat to mine safety and sustained operation. Hence, it is necessary to systematically study the bearing capacity of the foundation to ensure the safety and stability of the waste dump (Zhang et al, 2011;Chakraborty 2013;Park et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Bearing Capacity Calculation of Soft Foundation of Waste Dumps—A Case of Open-Pit Mine

et al. 2022

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For a waste dump with soft foundation, the foundation bearing capacity has an important impact on slope stability. According to the load distribution and stress characteristics of a waste dump, combining the gravity load of the triangular slope of the waste dump and the passive Earth pressure exerted by the foundation soil with an improved Plandtl formula, the foundation bearing capacity and the ultimate pile height of a waste dump are calculated and determined. The concept of foundation bearing capacity of a waste dump is redefined, that is, the ultimate pile height corresponding to a certain slope angle. A method for determining the ultimate pile height of a waste dump based on the slope angle of the waste dump is proposed, and the relation function between dump slope angle and waste height is established. The results show that the sliding moment increment (∆MS) caused by the gravity load of the triangular slope after waste increase is positively proportional to the pile height increment (∆H); the anti-sliding moment increment (∆MAS) is positively proportional to or positively correlated with the pile height increment (∆H); the slope angle of the waste dump decreases with the increase of the thickness of soft bedrocks, and the smaller thickness of soft bedrocks is more favorable to the ultimate pile height of the waste dump. The research results can provide reference for the calculation of the bearing capacity of soft foundation and the optimal design of slope shape of waste dumps.

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Investigation on the Deformation Law of Inner Waste Dump Slope in an Open‐Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Cited by 4 publications

References 39 publications

Determining the Safe Distance for Mining Equipment Operation When Forming an Internal Dump in a Deep Open Pit

Determining the Safe Distance for Mining Equipment Operation When Forming an Internal Dump in a Deep Open Pit

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

Bearing Capacity Calculation of Soft Foundation of Waste Dumps—A Case of Open-Pit Mine

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