"Relative Geodynamics" is first introduced briefly, which explains the irresistibility of the earthquake power source based on physical principles. Then, the basic idea for the continuous measurement of stress in mines all over the country is proposed. Lastly, the calculation formulas of stress field is deduced, so that the correctness of the process and the superiority of the boundary element back-analysis method are verified, taking the calculation of a coal mine roadway an instance.
Earthquake is the swift vibration of the crust in a short time and one of the most serious disasters on the earth. Earthquakes happen on earth everyday, and those can be recorded by instruments are about 5 million times per year . ‘People have plenty of ways to research the space, but have few accesses to earth's deep interior’. We still face great difficulties to master the law of earthquake by putting the instruments in the crust to observe the epicenter directly. The earthquake phenomenon is indeed very complex. There are still some clues, however, indicating the existence of the window to have some insights of the earthquake rules. As the earthquake prediction has the most direct and effective capacity to reduce the destructive damage, we shouldn't give up any chance to find out the rules of earthquake occurrence. Zhao Wenjin, a Chinese Academy of Engineering academician, said: ‘I think Mr. Li Siguang's earthquake geology – earth stress research is very promising.’
Due to a serious lack of the interpretation of physics decades ago, geology study developed very slowly. With the interdisciplinary study of physics, mathematics, astronomy and other subjects, great academic progress was made in the seismic science. In 1950s, Hast (N. Hast) first carried out the work of earth stress measurements in the Scandinavian Peninsula.