›› 2018, Vol. 39 ›› Issue (11): 4218-4225.doi: 10.16285/j.rsm.2017.0332

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of supporting resistance of reserved pier column for gob-side entry retaining in wide roadway

HU Ming-ming1, 2, 3, ZHOU Hui1, 2, ZHANG Yong-hui1, 2, ZHANG Chuan-qing1, 2, GAO Yang1, 2, HU Da-wei1, 2, LI Zhen4   

  1. 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3. Department of Civil Engineering, Hefei University, Hefei, Anhui 230601, China; 4. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
  • Received:2017-03-03 Online:2018-11-10 Published:2018-11-15
  • Supported by:
    This work was supported by the National Key R&D Program of China(2018YFC0809600), the National Natural Science Foundation of China (NSFC) (51427803), the Youth Innovation Promotion Association CAS，Wuhan Yellow Crane Talents(Science) Plan of China and the Key Research and Development Projects of Anhui Province (1804a0802206).

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Abstract: Conventional gob-side entry retaining technology has some limitations, such as mining speed restriction and risks of working in the goaf. In this study, we proposed a modified gob-side entry retaining technology named pier column reserving technology in the wide roadway. First, a wide roadway is excavated, and a row of pier columns are established in the middle of the roadway. One side of pier columns is the conveyance roadway of the working face, and the other side is the rail roadway of next working face. Then the rail roadway with the support of pier columns can be retained to use for the next working face. The results show that the pier columns can maintain the stability of surrounding rock during roadway drivage. Meanwhile, the safety is improved greatly by avoiding working behind the working face. During the roadway excavation, the technology of roadway secondary excavation and the bolt-column combined support are used to guarantee the roadway stability. At the stage of gob-side entry retaining, the high strength pier columns have great performance on roof cutting and supporting. When the distance between pillars is 1.5 m, the required pressure of pier column for roof cutting is 21.53 MPa, which is lower than the compression strength of pier columns. The bearing capacity of the pier column meets the requirements of gob-side entry retaining. The relative displacement of the top and bottom plates is 652 mm, and the maximum convergence of pier column is 164 mm. The pier column can play a certain role in relieving pressure and has good support to the roof, which can be well adapted to the roof activity law of gob-side entry retaining.

Key words: the wide section, gob-side entry retaining, pier column, roadside supporting resistance, stability of surrounding rock

CLC Number: 

  • TD 353
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