Influence of Hematite Coating on the Activation of the Swelling Potential of Smectite-Bearing Rocks

Mutschler, Thomas; Kramar, U.; Vergara, Maximiliano R.; Triantafyllidis, Theodoros

doi:10.1007/s00603-012-0289-z

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…), when interacted with air and water, become continuously and highly deformable [21]. Roadway support in swelling soft rocks has become one of the challenging mining problems in recent years [22][23][24][25][26][27]. Chagannuoer coal field is a typical swelling soft rock field in Inner Mongolia of China.…”

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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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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“…Roadway control in soft rock is a problem in many mines (Bilir 2011; Ghiasi et al 2012; Serafeimidis and Anagnostou 2013; Thomas et al 2013). For roadway control, a variety of support materials and structures have been developed, such as arch sheds, bolting, cables, and shotcrete (Goetze 1984; Okubo et al 1984; Rotkegel 2001; Stalega 1995).…”

Section: Introductionmentioning

confidence: 99%

“…The problem of roadway support in swelling soft rock has become a challenging problem in recent years (Bilir 2011; Ghiasi et al 2012; Schädlich et al 2013; Serafeimidis and Anagnostou 2013; Thomas et al 2013). In swelling soft rock, support measures include either, the application of a strong, rigid supporting formwork to limit deformation, or allowing floor heave to release swelling pressures, or a combination of both (Christoph et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Deformation mechanisms in a coal mine roadway in extremely swelling soft rock

Shi

Yang

2016

SpringerPlus

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The problem of roadway support in swelling soft rock was one of the challenging problems during mining. For most geological conditions, combinations of two or more supporting approaches could meet the requirements of most roadways; however, in extremely swelling soft rock, combined approaches even could not control large deformations. The purpose of this work was to probe the roadway deformation mechanisms in extremely swelling soft rock. Based on the main return air-way in a coal mine, deformation monitoring and geomechanical analysis were conducted, as well as plastic zone mechanical model was analysed. Results indicated that this soft rock was potentially very swelling. When the ground stress acted alone, the support strength needed in situ was not too large and combined supporting approaches could meet this requirement; however, when this potential released, the roadway would undergo permanent deformation. When the loose zone reached 3 m within surrounding rock, remote stress p∞ and supporting stress P presented a linear relationship. Namely, the greater the swelling stress, the more difficult it would be in roadway supporting. So in this extremely swelling soft rock, a better way to control roadway deformation was to control the releasing of surrounding rock’s swelling potential.

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“…Roadway control in soft rock is a problem in many mines (Bilir 2011; Ghiasi et al 2012; Serafeimidis and Anagnostou 2013; Thomas et al 2013). When roadways are excavated, pressure is redistributed.…”

Section: Introductionmentioning

confidence: 99%

Effect of bolting on roadway support in extremely weak rock

Shi

Qin

2016

SpringerPlus

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In mine roadway support operations, floor bolting not only played a role in floor heave control, but also in reinforcing roof and its two sides. Correspondingly, bolting of roof and two sides also played a part in floor heave control. To quantify the effect of such bolting, based on roadway support in extremely weak rock, three physical models were produced and tested in laboratory. Through comparison of their displacements in three physical simulation experiments, the reinforcing effect of bolting in extremely weak rock roadways was quantified. Reinforcing coefficients was defined as displacement ratio between original support and new support regime. Results indicated that the reinforcing coefficients, for bolting of roof and its two sides, on floor, two sides, and roof reached 2.18, 3.56, and 1.81 respectively. The reinforcing coefficients for floor bolting on floor, two sides, and roof reached 3.06, 2.34, and 1.39 respectively. So in this extremely weak rock, the surrounding rock should be considered as an integral structure in any support operation: this allows for better local strength improvement, and provided future design guidance.

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Influence of Hematite Coating on the Activation of the Swelling Potential of Smectite-Bearing Rocks

Cited by 7 publications

References 6 publications

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

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

Deformation mechanisms in a coal mine roadway in extremely swelling soft rock

Effect of bolting on roadway support in extremely weak rock

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