Study on new polymer spraying support of mine roadway with weak cemented soft rock in West China
LI Xuebin
YANG Chunman
WANG Bo
SHAO Fangyuan
WANG Lei
YANG Fuqiang
Abstract：According to inhomogeneous mechanics performance,poor extension performance,hard to well seal and support the surrounding rock,influenced surrounding rock mechanics characteristics and support structure stability problems of the conventional shotcreting layer,in combination with an engineering geological conditions and the mine strata pressure behavior law of the mine soft rock roadway in West China,based on the material mix ratio of the conventional shotcreting,the indoor material mix ratio test was applied to determine the material mix ratio and mechanics performances of the new polymer spray layer.The researched and developed polymer spray layer was high in the strength and good in the anti-cracking performance and extension performances and could meet the support requirements of the mine soft rock deformed roadway.An industrial trial was conducted on a test section of the rock roadway section selected from the general auxiliary transportation roadway in Hongqingliang Mine.The 6 month site monitoring and measurement showed that there was no big difference of the spray layers in the no water section of the roadway and there was a good integrity of the new polymer spray layer in the watering section of the mine roadway.The stability of the surrounding rock was good and the bolt and anchor were less stressed.Therefore,the new polymer spray layer would effectively seal the weak cemented soft surrounding rock in West China and could keep the long term stability of the mine roadway.
Keywords：weak cemented soft rockshotcreting layermaterial mix ratio testmine strata pressure monitoring and measuring
Publication Date：2017-01-01