Evaluation of tunnels under squeezing rock condition

Ghiasi, Vahed; Ghiasi, Samad; Prasad, Arun

doi:10.1108/17260531211241167

Cited by 12 publications

(8 citation statements)

References 11 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ere is high demand for roadway support in swelling soft rocks in recent years [1][2][3][4][5][6]. Swelling soft rocks always contain clay minerals (smectite, kaolinite, etc.)…”

Section: Introductionmentioning

confidence: 99%

Strength and Cost Analysis of New Steel Sets as Roadway Support Project in Coal Mines

Yang

Wang

et al. 2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Roadway support in swelling soft rocks in coal mines has become a critical challenge in recent years. For deformation control in swelling soft rocks, high strength sets are preferred in sites. But high strength always means high costs. Therefore, higher strength sets with not too much cost will be more welcomed in situ. Based on this, three new sets, including a floor beam set, a roof + floor beams set, and a roof + floor beams + braces set, have been developed in the present research. Strength comparisons and costs comparisons have been conducted in this research. Results illustrate that compared with the original set, in the floor beam set, the relative strength of bottom corners reaches 2.964, while the relative cost reaches 1.294; compared with the original set, in the roof + floor beams set, the relative strength of the top arch reaches 2.345, while the relative strength of bottom corners reaches 2.964, and the relative cost reaches 1.568; and compared with the original set, in the roof + floor beams + braces set, the relative strength of the top arch reaches 2.635, and the relative strength of bottom corners reaches 5.905, but the relative cost reaches 1.930. Floor beam set and roof + floor beams set illustrate higher strength and not too higher costs than the original set. Although the roof + floor beams + braces set exhibit much higher strength, they also demonstrate much higher costs than the original set. These new sets can be chosen according to different geological conditions in situ.

show abstract

“…ere is high demand for roadway support in swelling soft rocks in recent years [1][2][3][4][5][6]. Swelling soft rocks always contain clay minerals (smectite, kaolinite, etc.)…”

Section: Introductionmentioning

confidence: 99%

Strength and Cost Analysis of New Steel Sets as Roadway Support Project in Coal Mines

Yang

Wang

et al. 2018

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Evaluation of tunnels under squeezing rock condition

Cited by 12 publications

References 11 publications

Strength and Cost Analysis of New Steel Sets as Roadway Support Project in Coal Mines

Strength and Cost Analysis of New Steel Sets as Roadway Support Project 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

Contact Info

Product

Resources

About