Work out control measures for pillar upward mining of left-over coal, in view of coal floor movement, this paper analyzes theoretical foundation and mechanical properties of mechanical model on coal floor movement of rock strata between coal seams in pillar upward mining of left-over coal and presents a simplified corresponding mechanical condition. Taking into the relation between layer movement and time consideration, the PTh model is used to show its rheological properties. By using a two-dimension model, mechanical model of coal floor movement is set up and both ends of cantilever beam are fixed. Finally, subsiding partial differential equation is induced at different districts in pillar upward mining of left-over coal. After solving the equation, prediction model about law of coal floor movement at different districts is gotten in pillar upward mining of left-over coal, which provides a theory basis for further study on upward mining.

The primary of the research is decrease the traditional touched measurement complexity and modern three-dimensional untouched measurement high cost .The technique applied in the paper is referred to as follow: designing a rotating platform to control the people standing firstly, designing a video collecting system to obtain the body front and side images secondly, acquiring contour extraction through image preprocessing thirdly, obtaining anthropometric characteristics of image according to all parts of the body under the proportional and body three-dimensional contour curve fourthly, obtaining characteristic parameters of the actual body measurement by the camera calibration parameters finally. The results of the research demonstrated that the system is portable, high accuracy, low cost, particularly suitable for large, rapid measurement of body.