Study On The Control Technology Of The Gobs Under Yushen Express Way

As coal excavating, coal mine gobs are getting more and more which cause severesurface subsidence in China. The subsidence not only endangers the surrounding buildingsand public facilities but also induces geological disasters. Coal mine gobs treatment technicshave improved a lot as the subsidence happens frequently. There are lots of coal mine gobsinvestigation technics that geophysical exploration has15different kinds while the gobstreatment technics also have lots of different kinds. The experts all over the world have beenexploring the most scientific, economic, convenient and safest treatment technics to ensurethe safety of human beings and properties.Based on the previous studies, the author systematically studies the mechanism of theinstability of the gobs through proving the spatial distribution and analyzing the inducefactors. Through researching the different treatment technics compared to different burieddepth and occurrence, the paper summarized the treatment technics and gives an improvedand optimized technology. The main achievements of this paper are below:(1) Based on the mining method and the geological condition of the coal mine gobsunder Yushen Express way which was taken as an example in this paper, the reasonableinvestigation methods were taken to get the distribution and other characteristics of the gobsto do the stability analysis.(2) This paper analyzed the form of surrounding rock movement and the factors ofinstability of coal mine gobs. And the author checked the stability of the gobs under thefoundation of Yushen express way which included the ratio of mining depth and thickness, thesafety of roof and floor, the strength of coal pillars and the threshold of excavating depth, etc.Therefore, the range of the gobs with security risk was determined. (3) A scientific and economic treatment scheme was developed to ensure thepost-treatment safety of the gobs and the above buildings.(4) This paper elaborated the treatment range of the gobs and gave a new basis to decidethe treatment range by calculation of the gobs under the bridge foundations.Through deformation and subsidence monitoring, the treatment technics is proved to bescientific, reasonable and economic and it meets the safety requirement of the express wayoperation.