Time-domain characteristics of overlying strata failure under condition of longwall ascending mining

Liang, Shun; Li, Xuehua; Mao, Yanxin; Liu, Chengjun

doi:10.1016/j.ijmst.2013.04.018

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…The borehole imaging instrument used in the field imaging consisted of four parts: the main equipment, auxiliary equipment, high-definition probe and supporting rods [35], as shown in Figure 7. The images of the borehole wall that the auxiliary equipment generated could be transmitted via the electric cable to the main equipment, appear on its display in real time, and are stored in the high-capacity memory card.…”

Section: Field Imagingmentioning

confidence: 99%

A Novel Comprehensive Detection Method for the Dynamic Characteristics of Coalface Overburden: A Case Study in China

et al. 2017

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Accurate and efficient acquisition of information about the dynamic characteristics of coalface overburden can provide an important theoretical basis for green mining in coal producing regions in western China. In this study, a novel method for comprehensively detecting the dynamic behavior of coalface overburden is proposed in order to address deficiencies of the existing detection methods. The new method combines surface radon measurement, overburden borehole imaging, and underground pressure observation into a comprehensive detection technology system, resulting in spatial and temporal integration of surface, overburden, and underground detection. To examine the feasibility of the proposed method, a field experiment was carried out at #1103 coalface in the Suancigou Coal Mine, which is operated by the Inner Mongolia Yitai Coal Co. Ltd. The results of the three approaches are largely consistent and they complement one another. But it must be pointed out that this method needs to be further improved by more field experiments. Based on the experimental results, a technique for forced caving by presplit blasting of the overburden was developed and then implemented to #1103 coalface. The practical use of the technique led to good results: it effectively prevented roof-associated accidents by controlling the first weighting step to about 82 m, contributing to safe and efficient mining; coal production was expected to increase about 126 kilotons.

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Section: Field Imagingmentioning

confidence: 99%

A Novel Comprehensive Detection Method for the Dynamic Characteristics of Coalface Overburden: A Case Study in China

et al. 2017

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“…And, mudstone contains a high proportion of clay minerals, which easily leads to disintegration and high inflation under certain stress [15]. Based on this, some scholars have used the conventional compression test [16], shear test [17], and acoustic emission test [18] and found that the failure evolution and stress distribution of the weakly cemented surrounding rock had had obvious time effects [19][20][21]. Furthermore, the rock crept steadily under the lighter stress [22].…”

Section: Introductionmentioning

confidence: 99%

Study on the Rheological Failure Mechanism of Weakly Cemented Soft Rock Roadway during the Mining of Close‐Distance Coal Seams: A Case Study

Ning

et al. 2020

Advances in Civil Engineering

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During the mining of the shallow-buried and close-distance multiple coal seam, the rheological failure of the surrounding weakly cemented soft rock of the roadway in the lower coal seam under the concentrated stress is very rare. However, the stress on the roof of the upper coal seam is transmitted down through the residual pillar, resulting in this situation. Taking the Gaojialiang coal mine which is located in the mining areas of western China as the research object, the failure mechanism of the roadway roof under the residual coal pillar in the shallow-buried and close-distance multiple seam is studied in combination with field monitoring and numerical simulation. Furthermore, suggestions on the roadway support under such geological conditions are proposed. The results show that the residual coal pillar in the working face of the lower coal seam gradually collapses during the mining of the shallow-buried and close-distance multiple coal seam. The concentrated stress transferred by the coal pillar increases further, which makes the roof stress of the lower coal seam roadway to increase continuously. In addition, the stress of the roadway roof also increases further due to the rotation of the broken rock above the goaf, and the peek region of stress moves to the nongoaf area. Combining the heavy concentrated stress and weakly cemented property, the shallow-buried surrounding rock shows rheological behavior and failure. Therefore, we must pay more attention on the creep failure of the roadway roof under the action of the residual coal pillar even in the shallow-buried coal seam.

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“…Formation and distribution of interburden fractures induced by upward mining were explored with simulated material models [ 36 ]. Time-domain characteristics of interburden failure over an abandoned longwall working were investigated with field measurements [ 37 ]. Movement of the interburden in upward mining was analysed with numerical modelling [ 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study

et al. 2018

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Upward mining of the residual coal seam over an abandoned pillar working is one of the effective measures to alleviate the contradiction between limited resources and increased consumption. Interburden stability over an abandoned pillar working plays a significant role in guaranteeing the safety of upward mining; however, it has not yet been extensively studied and understood. In this study, the vertical stress of the interburden over an abandoned pillar working was first investigated. The mechanical model of the interburden was established and the damage conditions were analysed. Then, the stability of the interburden over 38502 abandoned workings in Baijiazhuang coal mine was determined by mechanical analysis and field monitoring. The results show that: (i) Vertical stress of the interburden over abandoned mining zones is clearly lower than the initial stress, indicating the existence of a de-stressed effect. Moreover, vertical stress of the interburden over residual coal pillars is greater than the initial stress, which is the evidence of a stress concentration effect. (ii) The interburden over an abandoned pillar working should be regarded as an elastic rectangular plate supported by generalized Kelvin bodies in mechanical modelling. (iii) The interburden over abandoned mining zones may experience two damage stages. In the first stage, initial plastic damage appears at the central region of interburden. In the second stage, the plastic damage evolves from the central point to the surrounding areas. (iv) The mechanical analysis and field monitoring both indicate the initial damage occurred at the central region over 38502 abandoned workings in Baijiazhuang coal mine before upward mining. Related rock control measures should be implemented in that region to guarantee the safe mining of the residual coal seam.

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Time-domain characteristics of overlying strata failure under condition of longwall ascending mining

Cited by 11 publications

References 1 publication

A Novel Comprehensive Detection Method for the Dynamic Characteristics of Coalface Overburden: A Case Study in China

A Novel Comprehensive Detection Method for the Dynamic Characteristics of Coalface Overburden: A Case Study in China

Study on the Rheological Failure Mechanism of Weakly Cemented Soft Rock Roadway during the Mining of Close‐Distance Coal Seams: A Case Study

Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study

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