Study on ground stress distribution law in Longkou sea area

摘要

After mining under a water body, the surrounding-rock deformation was large and the support was difficult, which seriously affected the production of the Longkou Beizao mine. One reason is the undefined value and direction of the ground stresses, the other is the high rheology of the overburden rock due to the high clay content. In terms of mining and tunnel engineering, reasonable roadway direction, section configuration,dimension, excavation step, supporting form, supporting parameters and so on can be determined only once the ground stress distribution is mastered. Stress distribution law is obtained through analyzing structures in the mining area and the tectonic stress field to master the ground stress distribution law in Longkou sea area.Distribution law of ground stress field in extended sea area of Beizao mine is qualitatively analyzed. Then in-situ stress measurements have been carried out in Longkou Beizao mine. The results show that the horizontal tectonic stress is the major principal stress and that the vertical stress is slightly smaller than the upper terrane weight.Finally, the relationship between ground stress distribution law and stability of surrounding rocks is analyzed,which provides scientific basis for support of roadway in extended Longkou sea area.