Improvement of the U-shaped steel sets for supporting the roadways in loose thick coal seam

Jiao, Yu Yong; Song, Liang; Wang, Xin Zhi; Adoko, Amoussou Coffi

doi:10.1016/j.ijrmms.2012.12.038

Cited by 125 publications

(48 citation statements)

References 13 publications

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“…Jiang et al [18] studied the influence of foundation stiffness of the immediate roof on the stability of roadway roof. In terms of roof fall control technology, Jiao et al [19] proposed a method for strengthening the chamber dome by U-shaped steel support for the roadway in the weak coal seam. Ju et al [20] proposed an inner stagger layout to control the roadway roof fall for the layout of the lower coal seam roadway.…”

Section: Introductionmentioning

confidence: 99%

Dome Roof Fall Geohazards of Full-Seam Chamber with Ultra-Large Section in Coal Mine

et al. 2019

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Featured Application: In this study, the mechanism of roof fall of full-seam ultra-large section chamber was uncovered and the corresponding control technology was put forward and successfully applied. The study provide a successful case of roof fall control in a special condition, and has a guiding and reference significance for ultra-large section chamber control during extra-thick coal seam mining, which is beneficial to ensure the production efficiency of coal mine. Abstract:The roof fall hazard is more likely to take place within chamber with ultra-large section, which would not only damage mechanical equipment, but also cause casualties. In this paper, the strap joint chamber of the Tashan coal mine is studied, and finite and discrete element method (FDEM) is used to establish the numerical model of the roof fall of the chamber dome. The simulation results show that the chamber dome mainly undergoes shear failure and forms a large number of cracks. With further development and penetration of cracks, a distinct roof separation is found in the chamber dome. When the crack develops to the dome surface of the chamber, under the effect of the mine pressure, the coal body is separated from the surface of the chamber and the roof fall hazard occurs. Based on the mechanism of roof fall hazard of the chamber dome, it is concluded that improving the shear strength of the surrounding rock and reducing the crack penetration are the main ways to control the roof fall. Therefore, the high-strength anchor bolt and cable support is adopted to fill the cracks and improve the shear strength of the surrounding rock. The result showed that the roof separation of the chamber dome in the field is confined to 0.012 m. The surrounding rock is well controlled and no roof fall occurs.

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Section: Introductionmentioning

confidence: 99%

Dome Roof Fall Geohazards of Full-Seam Chamber with Ultra-Large Section in Coal Mine

et al. 2019

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“…The low intensity, poor cementation means that it is difficult for bolting and cabling to exert the anchoring effects, and because of swelling in water, grouted bolting could not be used in situ. There is a growing realization that a set with high strength is an effective alternative to control large deformation in this rock [32], therefore, high strength steel sets become an important approach to control this deformation. In order to get higher strength steel sets, higher strength materials can be In swelling soft rocks, support approaches should possess sufficient bearing capacity [31].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Bearing Capacity and Stiffness in New Steel Sets Used for Roadway Support in Coal Mines

Yang

Zhu

2017

Energies

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Abstract:There is high demand for roadway support in coal mines for the swelling soft rocks. As high strength steel sets can be taken as an effective alternative to control large deformation in this type of rocks, based on an original set, three new sets, including a floor beam set, a roof and floor beams set, and a roof and floor beams and braces set, are proposed in this research. In order to examine the strengths of new sets, four scaled sets of one original set, and three new sets, have been manufactured and tested in loading experiments. Results indicated that three new sets all exhibited higher strength than the original set. In experiments, the roof beam in set plays a significant effect on top arch strengthening, while the floor beam plays significant effect on bottom arch strengthening. The maximum bearing capacity and stiffness of the top arch with roof beam are increased to 1.63 times and 3.06 times of those in the original set, and the maximum bearing capacity and stiffness of the bottom arch with floor beam are increased to 1.44 times and 3.55 times of those in original set. Based on the roof and floor beams, two more braces in the bottom arch also play a significant effect in bottom corners strengthening, but extra braces play little role in top arch strengthening. These new sets provide more choices for roadway support in swelling soft rocks.

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“…However, the effectiveness and applicability of rock bolt system for the reinforcement of soft rock masses has not yet been established (Jiao et al, 2013;Wang et al, 2000;Yoshinaka et al, 1998). Soft rock refers to a group of geotechnical materials that has a uniaxial compressive strength between 0.5 and 25 MPa and has similar geotechnical characteristics, including slaking, swelling, compressibility, time dependence, and volume change (Jiao et al, 2013;Wang et al, 2000;Yoshinaka et al, 1998). Roadways caved out of soft rocks exhibit large deformation in the form of severe roof sag, wall convexity, and floor heave.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers suggested that yieldable and flexible support patterns should be used to support soft rock roadways, instead of stiff supports such as the rock bolt system (Jiao et al, 2013;Wang et al, 2000). A common structure for supporting roadways in soft rocks is the installation of yieldable U-shaped steel sets.…”

Section: Introductionmentioning

confidence: 99%

“…A common structure for supporting roadways in soft rocks is the installation of yieldable U-shaped steel sets. This support pattern is believed to provide sufficient support to suppress the deformation of soft rocks surrounding a roadway and has been proven to be successful where implemented (Jiao et al, 2013;Wang et al, 2000). In contrast to rock bolting, the yieldable U-shaped steel sets are passive, costly, and time-consuming to install.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on support pattern of a coal mine roadway within soft rocks — a case study

Kang

Lin

Fan

2015

International Journal of Coal Geology

157

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Improvement of the U-shaped steel sets for supporting the roadways in loose thick coal seam

Cited by 125 publications

References 13 publications

Dome Roof Fall Geohazards of Full-Seam Chamber with Ultra-Large Section in Coal Mine

Dome Roof Fall Geohazards of Full-Seam Chamber with Ultra-Large Section in Coal Mine

Assessment of Bearing Capacity and Stiffness in New Steel Sets Used for Roadway Support in Coal Mines

Investigation on support pattern of a coal mine roadway within soft rocks — a case study

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