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Scientific Importance of the Academic Achievements of Professor Knothe for Ground Movement Calculation in Germany

Hegemann M.

Prace Instytutu Mechaniki Górotworu PAN

2018

T. 20, nr 1

33--44

In Germany subsidence on the surface as a result of underground coal mining are known since 1850. In 1860, fi rst height measurements are carried out. With this data mining subsidence, engineering starts in Germany (1st period). The results of this first period only refer to subsidence. The “Trough Theory” of Lehmann (1919) essentially characterizes the 2nd period of research. The basic model of the ground movement elements and their interrelationships are defined. On this basis, different calculation procedures are developed. In the time after World War II (3rd period) different distribution functions of subsidence based on mathematical models are developed as well as empirical profile curves. In Poland, Professor Knothe introduces the calculation method based on the theory of stochastic media in 1953. It was 1959 before the ideas of Professor Knothe are published in German language. Very quickly, Professor Knothe´s model is picked up and in 1969, Erhardt and Sauer develop a computer software (Ruhrkohle Procedure). The author follows up with the theory of Professor Knothe during his thesis on horizontal ground movements. It is evident that horizontal movements of the measuring points change their direction continuously. At any time, all measuring points have the same destination point of their horizontal movements, which is called the focal point of impact. A qualitative correlation of the position of the focal point of impact and the panel speed is proved. It is confirmed by measurements that the change of the panel speed brings additional dynamics in the process of horizontal movements In the years 1999-2002, when Poland is still not an EC Member, the Institute IMG PAN attends a EU research project as guest. The aim of the Polish part project is to clarify the impact of the occasional cessation of face advance on the course of ground movement and deformation. The essential points are quoted from the final report of the EU project. Professor Knothe made a signifi cant contribution to scientific work in Europe by the establishment of the Institute of IMG PAN and his activities in international research.