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Application of concrete‐filled steel tubular columns in gob‐side entry retaining under thick and hard roof stratum: A case study
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Application of concrete‐filled steel tubular columns in gob‐side entry retaining under thick and hard roof stratum: A case study
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Journal Article
Application of concrete‐filled steel tubular columns in gob‐side entry retaining under thick and hard roof stratum: A case study
2019
Overview
The successful retaining of the gob‐side entry under a thick and hard roof stratum is difficult because of the high pressure present and complex construction technology commonly used. To solve this problem, a new type of gob‐side entry supporting system is proposed in this paper. This system is mainly composed of concrete‐filled steel tubular columns (CSTCs), flexible cushion, and gob isolation structures. This new supporting system combines the high‐strength support of CSTCs with the flexible support of cushion bodies and is simple to construct, enabling fast and efficient gob‐side entry retaining under a thick and hard roof stratum. The range of the roof strata controlled by gob‐side support structures is determined for a case study, and a calculation formula for the gob‐side support resistance is established. Through theoretical and experimental research, a reasonable calculation formula for the choice of CSTC is also established. The CSTC structure ultimately selects Φ194 × 8 mm hollow steel tubes and C40 grade concrete for use in a field application, which can provide 4814 kN of supporting force. A simple on‐site construction process is designed for the field application, and the time required for entry retaining per meter is only approximately 40‐45 minutes. This application shows that the new technology controls the deformation of the retained entry very well; the final deformation stabilizes at 412 mm, which meets the engineering requirements. In this work, a new type of gob‐side supporting system based on the concrete‐filled steel tubular columns (CSTCs) was proposed. It was proven that the new type of gob‐side entry retaining technology based on the CSTC structure is more suitable for entry retaining engineering under high‐stress conditions and clearly exhibits the advantages of a high supporting resistance, low supporting cost, and simple construction process.
Publisher
John Wiley & Sons, Inc,Wiley
Subject
