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Research on the calculation of grout amount of harnessing the surface subsidence by injecting clay grouts into separated strata

YANG Yu, ZHAO De shen, LIU Wen sheng, FAN Xue li (Liaoning Technical University, Fuxin 123000, Liaoning, China)  
With the large amount exploitation of coal underground, the shifting of the space in coal bed caused land subsidence.We put forward using the technology of injecting clay grouts into separated strata to control the surface subsidence on the basis of the theory about the occurance and development. According to the experience of injecting project,the volume and the pump pressure corresponding with it are some of the most important factors. After studying the mechanism of injecting and the flowing model,the paper advances two methods to calculate the clay grouts volume\,introduces some important parameters\,brings out the matching relation with the pump pressure by using the Berniulli Equation and gives an example of selecting type on the basis of the theory above.The experience may provide theoretical foundation for the injecting design on spot.
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