Study on the Law of the Movement and Damage to Slope with the Combination of Underground Mining and Open-Pit Mining‪.‬

1. Introduction Underground mining will damage the balance of the ground stress and cause the surface movement of rock mass, leading to mining damage in these areas. However, in cases where both underground mining and open-pit mining are employed, the mining slope will receive integrated superposition according to the corresponding relation of the extraction level and the superposition process of mining effect. It exhibits as a kind of mining effect which interferes or acts to another balanced system, making two types of excavation body arouse and interfere mutually, and constitute a complex dynamic system. Many domestic and abroad scholars have participated in the study of Strata Movement and Mining Subsidence, one of the bases in mining, and made many valuable research results. Some coal-producing countries in Europe carried out a systematic research on Strata and surface movement in 1930s. Ever since the 1950s, studies on Strata and surface movement have been developed vigorously. The methods of entire filling stoping, segmental mining, concerted mining and strengthening building are used in Germany, Poland, Russia and the United Kingdom, which have overcome the hazards of mining effect and thus succeeded in coal mining under buildings and railways, with the establishment of a series of rock and ground movement theory [1].