Research on Control Technology and Structural Characteristics of Very Instable Surrounding Rocks in Structural Belt
According to the actual state of the 1150 horizontal main haulageway of Tailai colliery is in the affected areas of many faults, both on the roof to floor and two sides convergences are about 1000mm,the YTJ20 strata structure detector was used to detect the strata structure character of the roadway roof, it showed the surrounding rock of 1150 horizontal main haulageway is very broken and the maximum failure depth reached to 6m; meanwhile we took 4 group of rock samples from the broken zone to carry out x diffraction, the results showed that the surrounding rock in the broken contained high expansibility rock, so measure of rock surrounding grouting reinforcement was proposed without changing the original supporting parameters. Comparative analysis of rock surrounding reinforcement effect before and after grouting was calculated by FLAC simulation soft. The result shows only supported “bolts + shotcrete layer + cables”, both the deformation speed and deformation amount are very obviously, the community of “rock-support” shows loose and breaking state; But using the combined supporting method of grouting reinforcement and “bolts + shotcrete layer + cables”, the surrounding rock deformation obtained effectively control with less stress release, the community of “rock-support” shows higher integrity degree, It can ensure the safe use of the roadway.
Y. J. Zhu "Research on Control Technology and Structural Characteristics of Very Instable Surrounding Rocks in Structural Belt", Advanced Materials Research, Vols. 261-263, pp. 1743-1748, 2011