Citation

Kang H, Wang J, Lin J. Yanshilixue Yu Gongcheng Xuebao 2010; 29(4): 649-664.

Copyright

(Copyright © 2010, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences)

DOI

unavailable

PMID

unavailable

Abstract

Based on analyzing bolting mechanism, the theories of high prestress and intensive bolting are put forward, which emphasize the decisive part of the bolt prestress and its diffusion. It is pointed out that the primary supporting should be able to control the displacement and damage of the surrounding rock as soon as possible under complicated conditions. The complete bolting techniques for coal mine roadways are introduced, including geomechanics testing, the dynamic information method for bolting design, the materials of high strength bolts and cables, the construction quality detecting and monitoring techniques, and the combination techniques of bolting and grouting. Typical cases are described on the basis of roadway types, including the roadway with buried depth more than 1 000 m, the entry in soft rock, the entry strongly affected by active mining activity, the large section open-off cut, the entry driven along next goaf with a thin pillar, the entries retained for next sublevel and in the goaf, and the damaged chamber with soft and broken surrounding rocks. On the basis of the features of the roadways and field testing results, the reinforcement designs are carried out; and the rationality of the designs and the stability of surrounding rock are evaluated through the analysis and feedback to field monitoring data. These practices point out that the high prestress and intensive bolting system, combined with grouting if necessary, can effectively control the violent displacements of the surrounding rock and good reinforcement effects can be achieved.