Principles of the roof cut short-arm beam mining method (110 method) and its mining-induced stress distribution

Tao, Zhigang; Song, Zhen; He, Manchao; Meng, Zhigang; Pang, Shuiquan

doi:10.1016/j.ijmst.2017.09.002

Cited by 73 publications

(40 citation statements)

References 3 publications

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“…The gob was filled with solid wastes, such as gangues and fly ash, which greatly reduced the roof subsidence and the pressure on roadside support. Fourth, the technique of no‐pillar mining with automatically formed gob‐side entry retaining was proposed . This technique presplit the roof along the gob‐side via borehole blasting, and the gob‐side roof was cut down to the gob as the working face advancing.…”

Section: Introductionmentioning

confidence: 99%

“…It becomes very difficult for traditional roadside supports to bear the tremendous pressure caused by hanging roof subsidence. Experts and scholars have proposed that cutting the roof at the roadside via borehole blasting can effectively eliminate the pressure on the roadside supports . However, the borehole blasting will be affected by many factors.…”

Section: Introductionmentioning

confidence: 99%

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An innovative approach for gob‐side entry retaining in deep coal mines: A case study

Fan

Liu

Tan

et al. 2019

Energy Science & Engineering

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Due to the complex geostress and mining conditions in the coal seam with depth of 800 m, stability of surrounding rock for gob‐side entry retaining is very difficult to achieve. In this paper, we firstly propose an innovative bolt‐grouting controlled roof‐cutting for gob‐side entry retaining (BCR‐GER) approach for deep coal mines. Secondly, a mechanical model of “surrounding rock‐supporting body” for BCR‐GER is constructed, which consists of coal wall, roadside props, and gangues in gob (the whole supporting body). Thirdly, the key parameters (ie, cutting height, cutting angle, grouting cable length, and row of roadside props) are designed. Finally, field practice was applied at the No. 31120 haulage roadway of the Suncun coal mine in China, and in situ investigations were conducted for verification. Field measurement results show that maximum convergences of roof‐to‐floor and side‐to‐side were 264 mm and 113 mm, respectively. What is more, the maximum support resistance of roadside props was reduced by approximately 58%. The deformation and failure of surrounding rock were effectively controlled, and the pressure on roadside props was greatly reduced. This research fully considers the bearing properties of gangues in gob, eliminates the secondary disasters caused by borehole blasting, and provides guidance and reference for deep surrounding rock control of the same or similar gob‐side entry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

Fan

Liu

Tan

et al. 2019

Energy Science & Engineering

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“…Currently, the existing and traditional means of gob-side entry retaining have been achieved mainly by using backfilling support to protect the entry and to control roof movement. In recent years, a new non-pillar mining technology, gob-side entry retaining by roof cutting (GERRC), has been put forward by a Chinese scientific research team [3,4]. In this technology, the relationship between the gob roof and the entry roof is cut off using a directional joint-cutting technique, forming a short cantilever beam structure above the entry roof.…”

Section: Introductionmentioning

confidence: 99%

Roof Deformation Characteristics and Preventive Techniques Using a Novel Non-Pillar Mining Method of Gob-Side Entry Retaining by Roof Cutting

et al. 2018

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Abstract:A new non-pillar mining technology, gob-side entry retaining by roof cutting (GERRC), different from the conventional gob-side entry retaining formed by a roadside filling support, is introduced in this study. In the new technology, roof cutting is conducted so that the roof plate forms a short cantilever beam structure within a certain range above the retained entry, thus changing the stress boundary condition of the roof structure. To explore the deformation characteristics of the roof under this special condition, a short cantilever beam mechanical model was established and solved using energy theory and displacement variational methods. Meanwhile, a theoretical and analytical control solution for roof deformation was obtained and verified via field-measured results. Based on the aforementioned calculation, the relationship between the roof deformation and main influence parameters was explored. It was concluded that the rotation of the upper main roof and width of the retained entry had the most significant impacts on roof deformation. Bolt and cable support and temporary support in the entry had a non-obvious influence on the roof deformation and could not prevent the given deformation that was caused by the rotation of the upper main roof. Based on comprehensive theoretical analysis and calculation results, ideas and countermeasures to control short cantilever roof deformation-that is, designing a reasonable height of roof cutting and a controlled width of retaining entry-were proposed and tested. Field monitoring shows that the entry control effects were satisfactory.

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“…In 2008, the "short cantilever beam by roof cutting" theory [13][14][15][16] was put forward by Professor Manchao He, an academician of the Chinese Academy of Sciences. In this theory, the ground pressure is used for the purpose of advancing the roof caving by precutting to form a cantilever beam above the gob-side gateway.…”

Section: Introductionmentioning

confidence: 99%

Study on Presplitting Blasting the Roof Strata of Adjacent Roadway to Control Roadway Deformation

Yang

et al. 2019

Shock and Vibration

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In order to solve the problem of roadway deformation based on the theory of “short cantilever beam by roof cutting,” the method of “pressure relief by roof cutting in the adjacent roadway” is proposed. Through presplitting blasting the roadway hard rock layer, the stress propagation path is cut off, and the surrounding rock stress environment of the roadway is improved, to achieve the purpose of controlling the deformation of the roadway caused by stress. Through theoretical analysis, it is determined that the depth of the presplitting blasthole is 17 m, and the angle with the vertical direction is 10°. Based on in situ measurements and tests, by presplitting blasting the roof strata of the adjacent roadway, the maximal value of the working resistance of the hydraulic support in the presplitting blasting side of the working face decreased by 24.9%, and the average volumes of the maximum floor heave, the maximum roof subsidence, and the maximum ribs displacement were reduced by 50.1%, 34.9%, and 41.7%, respectively. This method completely changes the traditional thought patterns of “reinforcing support” to control roadway deformation from “strong support” to “pressure relief.” It provides a new idea for controlling the roadway deformation.

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Principles of the roof cut short-arm beam mining method (110 method) and its mining-induced stress distribution

Cited by 73 publications

References 3 publications

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

An innovative approach for gob‐side entry retaining in deep coal mines: A case study

Roof Deformation Characteristics and Preventive Techniques Using a Novel Non-Pillar Mining Method of Gob-Side Entry Retaining by Roof Cutting

Study on Presplitting Blasting the Roof Strata of Adjacent Roadway to Control Roadway Deformation

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