文档介绍：英文原文
Study on destressing technology for a roadway driven along goaf in a fully mechanized top-coal caving face
Abstract Based on the deformation characteristics of the roadways driven along goaf in fully mechanized top-coal caving faces,the author considers that it is the key to ensure the stability of surrounding rocks of roadway driven along goaf to control the deformation during the period affected by the characteristics of the roadway layout in fully mechanized top-coal caving faces,a technical scheme of destressing is put forward and the destressing effect is analyzed by using the software of Universal Distinct Element Code (UDEC- ).
Keywords fully mechanized top-coal caving,gob-side entry driving,
roadway layout
characteristics of the gob-side entry in a fully mechanized top-coal caving face
In the light of key stratum theory and the law of overlying strata movement , we know that along the dip direction the main roof broke in coal wall of the lower district sublevel and formed a rock beam structure called big structure of surrounding rocks after the upper district sublevel is extracted forward. At the same time , the peak of side abutment pressure is transferred to the depth away from the periphery along the dip direction and the coal body under the big structure lies in stress-relaxed area where the gob-side entry is laid out , as shown in . The stability analysis of the big structure of surrounding rocks and field surveys all show that the deformation law of the roadway driven along goaf in fully mechanized top-coal caving faces obviously differs from other kinds of entries. The main characteristics are listed as follows[1,2].
The structure relationship between gob-side entry and overlying strata in a fully mechanized top-coal caving face
(1)During the period of roadway excavation, the deformation law of the gob-side entry in a fully mechanized top-coal caving face is similar to that of general