Practice of rapid repair and treatment technology of highway in Huangyuchuan Coal Mine subsidence area

Highway construction has improved the travel speed and quality of mining area and surrounding cities. For the treatment of highways affected by coal mining subsidence,reconstruction of standardized road surface with road closure,standardized repair of local road closure,fast-setting materials rapid repair,and prefabricated board machinery are often used. Such kinds of technologies are not suitable for coal mining subsidence area because of the excessive length of the repaired section,the increased construction cost,the inability to adapt to the severe surface movement and deformation,the inability to avoid the influence of the second mining of the working face,the high cost,or the closed road and the long period of road reconstruction. In order to solve the problem of coal mining subsidence and damage by large movement and deformation,wide range and multiple disturbances of the road surface,taking the Xiqing highway of Huangyuchuan Coal Mine as the background,firstly,surface movement and deformation of the working face after mining was calculated and analyzed. Based on the numerical difference between road surface and surface movement and deformation,combined with the local pavement movement deformation damage threshold,the pavement anti-mining ability,the relationship equation between the Xiqing road surface movement deformation and the surface movement deformation was established. Then,the research and practice of the rapid pavement maintenance technology and practice in each district were carried out. Research and engineering application show that road damage can be divided into general crack zone and discontinuous crack zone based on the relationship equation of movement and deformation between surface and road. The pavement in the slightly deformed crack area is treated with potting,and the severely deformed discontinuous crack area is treated with hexagonal concrete bricks and its auxiliary processes and then the standard asphalt pavement is resurfaced after the surface movement and deformation are stabilized.