Abstract: Based on the analysis of the influence of the Knothe time function parameter, This paper puts forward that before the Knothe time function is convergent, for the same point in time, the smaller the value of becomes, the smaller the Knothe time function value becomes, and vice versa. The influence of the different parameter on the Knothe time function value is very significant, especially when t∈[0,0.2]. According to the general laws of surface subsidence and the size at which the gob reached the full extraction, a new evaluation parameter model of Knothe time function (named the probability integral calculate the parameter method) was established. By comparing the measured value and the calculated value of the model of Pingan coal mine, Fuli coal mine and Suncun coal mine, the correctness of the model is verified. By applying the model to several observational subsidence data of the strike line of the 29401 face, and comparing the measured data and predictions, the practicality and reliability of the Knothe time function parameter calculation model is established in this paper.

Key words: mining subsidence, Knothe time function, probability integral calculate the parameter method