Numerical Modeling Study of the Geo-mechanical Response of Strata in Longwall Operations with Particular Reference to Indian Geo-mining Conditions

Behera, B.; Yadav, Akhilesh Kumar; Singh, Gurmohan; Sharma, S. K.

doi:10.1007/s00603-019-02018-w

Cited by 22 publications

(14 citation statements)

References 32 publications

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“…It can be seen from Figures 10 and 11 that the maximum displacement for both methods is approximately 1.3 × 10 −2 m, which is far bigger than that requiring 10 −4 m standard [3]. Figures 12 and 13 show the displacement of soil and concrete separately.…”

Section: Model 3: Model With Contact Interactionmentioning

confidence: 93%

“…In the numerical analysis of geotechnical engineering, the geostatic stress field procedure is used to verify that the initial geostatic stress field is in equilibrium with applied loads and boundary. Only when the obtained geostatic stress accurately restores the actual situation of the studied soil, can the simulated problems such as foundation pit excavation or tunnel excavation problems be solved in accordance with the actual situations [3]. erefore, the geostatic stress field procedure is one of the vital steps for various geotechnical engineering numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Geostatic Stress Field Procedure under Complex Conditions

Wang

Yuan

et al. 2021

Advances in Civil Engineering

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Geostatic stress field procedure is the first and the most important step for the numerical simulation of geotechnical engineering, which greatly influences the simulation results. Traditional methods often fail when the model is complex. In this paper, based on finite element method (FEM) software ABAQUS, failure reasons of four commonly used methods for the geostatic stress field are studied. According to the analysis results, a new set of methods, which can provide reasonable displacement and stress field results under complex conditions, is proposed. The proposed methods follow the principle that the stress of different materials should be obtained separately to avoid stress distortion. Then, the accuracy and applicability of the proposed method are verified through a comparison study and a specific application. This study provides a theoretical basis for the method of geostatic stress field procedure under complex condition and can serve as a reference for relevant studies.

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Section: Model 3: Model With Contact Interactionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Research on the Geostatic Stress Field Procedure under Complex Conditions

Wang

Yuan

et al. 2021

Advances in Civil Engineering

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show abstract

“…This representation techniques can also be seen in Li et al (2018) and Zhang et al (2019), in which FLAC3D was used to investigate rockburst and roof fracture caused by longwall top coal caving respectively. A longwall panel containing subhorizontal parting planes was explicitly modelled by FLAC3D using interface elements in Behera et al (2020). The modelling technique did not consider other typical structures such as joints within coal seam (Figure 2).…”

Section: Continuum Modelling Techniquesmentioning

confidence: 99%

Numerical modelling techniques for studying longwall geotechnical problems under realistic geological structures

2021

JMES

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Longwall - associated geotechnical problems have been extensively studied by using numerical modelling methods. However, proper representation of its geological structures remains a challenging task. This paper presents a systematic understanding of numerical modelling techniques for studying longwall coal mining with geological structures. The modelling techniques derived from conventional and advanced continuum and discontinuum methods were reviewed in detail with emphasiz on their mechanic's formulation and applications. This study suggests that the successful selection of a proper modelling technique should be based on the physical principle of longwall problem, texture and shape of materials, and mechanics formulation of the numerical program used for modelling. The paper’s conclusions assist numerical modellers in quickly and properly selecting modelling technique for investigating a site - specific longwall problem.

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“…e results showed that the mechanical structure of the hydraulic support had a certain impact on the support. Some previous works [21][22][23][24] established the stope analysis model of fully mechanized mining face using theoretical calculations and finite element software FLAC 3D. e working resistance and support force of the face guard were made equivalent to static rigid force by changing the working resistance and the horizontal support force of the face guard.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Protection Performance of Face Guard for Large Mining Height Hydraulic Support

Wan

Zhang

Meng

et al. 2021

Shock and Vibration

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With the increase of mining height, the problem of coal wall spalling in the working face gradually worsens. Hydraulic support and its face guard structure are the key pieces of equipment to restrain the coal wall spalling. However, at present, the hydraulic jack is mostly considered as rigid in the analysis of protection mechanism. This simplification cannot effectively reflect the true bearing state of the face guard. In order to improve the accuracy of analysis, this study considers the face guard jack as a flexible spring and establishes a rigid-flexible coupling analysis model of the face guard mechanism. First, based upon the multibody dynamics software ADAMS®, the multibody numerical model of the face guard of the hydraulic support was established. The influence of the two kinds of structures on the coal wall disturbance was analyzed and compared. Then, the rigid model was meshed. The hydraulic jacks were equivalent to the spring system, and the rigid-flexible coupling model was established. Based upon the application load on different positions of the rigid-flexible model, the load-bearing characteristics and hinge point force transfer characteristics of the two face guards were analyzed. The results show that the support efficiency of the integral type was higher than that of the split type. In the vertical support attitude, the dynamic disturbance of the coal wall, produced by the two kinds of face guards, was small. The four-bar linkage effectively improved the ultimate bearing capacity of the integral face guard. The results provide theoretical support for the design and optimization of the face guard.

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Numerical Modeling Study of the Geo-mechanical Response of Strata in Longwall Operations with Particular Reference to Indian Geo-mining Conditions

Cited by 22 publications

References 32 publications

Research on the Geostatic Stress Field Procedure under Complex Conditions

Research on the Geostatic Stress Field Procedure under Complex Conditions

Numerical modelling techniques for studying longwall geotechnical problems under realistic geological structures

Analysis of the Protection Performance of Face Guard for Large Mining Height Hydraulic Support

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