Patent ID: 9689258
Date: 2017-06-27
CPC Classifications: E21F

Claim:
1. A water-preserved mining and roof-contacted filling method for controlling fissures of overlying strata and surface subsidence, comprising the following steps: a. detecting the goaf at the mining and filling working face, to ascertain the peak elevation of the roof; b. mounting a stress sensor at the peak elevation of the goaf roof to ascertain the bottom surface of the stress sensor is at the peak elevation of the goaf, and connecting the stress sensor through at least one data line to a digital display device disposed outside of the goaf; c. laying a filling pipeline, an air exhaust pipeline, a refilling pipeline, and a refilling air exhaust pipeline along the goaf roof in the area to be filled, in a way that terminal ends of the pipelines are at the peak elevation of the goaf roof and tilt upwards, a refilling pipeline plug is provided on the terminal port of the refilling pipeline, and a refilling air exhaust pipeline plug is provided on the terminal port of the refilling air exhaust pipeline; d. building a sealing wall at an ending port of the working face to seal the filling area in the goaf, connecting a grouting pump to the filling pipeline and grouting into the sealed goaf, until the grout over-flows out of the air exhaust pipeline, when grouted grout reaches the peak elevation of the goaf roof, the stress sensor transmits stress variation data generated in the filling process to the digital display device disposed outside of the goaf through the data line; e. when refilling the goaf, utilizing the hydraulic pressure in an underground water supply pipeline or the air pressure in an underground air supply pipeline to push out the plug on the refilling air exhaust pipeline, filling a filling body into the refilling pipeline at the same time to push out the plug on the refilling pipeline under the grout discharge pressure at the terminal ends of the refilling pipeline, and finally realizing a roof-contacted filling state of goaf.