Study on Surface Ground Displacement Law Measure of Fully Mechanized Top Coal Caving Mining in Shallow Depth Thick Seam

In order to study the surface ground displacement law under the conditions of the fully mechanized top coal caving mining in shallow thick seam,a surface ground displacement observation station was established above a fully mechanized top coal caving mining face in Wanli Mining Area and several observations were conducted.With the measured data analysis on the surface ground displacement and deformation,the surface ground displacement law of the fully mechanized top coal caving mining under the conditions of the mining area was obtained.The results showed that the mining depth of the coal mining face was shallow,the mining scope of the coal mining face was large and the values of surface ground displacement and deformation were high.The distribution of the surface ground movement basin could basically meet the model of the probability integration,the comprehensive subsidence coefficient was 0.78,the tangent of the major influence angle was 2.8 and the deviation distance coefficient of the inflection point was 0.14.