Characteristics of burnt rock and slope stability analysis in Laojunmiao open pit coal mine

摘要

There is a large burning area in Xinjiang Laojunmiao open pit coal mine.To ensure the slope safety, characteristics of surrounding rock after baked and burnt were understood through the geological investigations and the rock mechanics tests.The typical profiles of burning area were selected according to the engineering geological characteristics.The safety factors of the profiles in the different final slope angles and the different states were computed through the limit equilibrium method, then the stabilities were analyzed to determine the reasonable final slope angle.The results show that strengths of burnt rock decrease compared with original rock.When the final slope angle of Laojunmiao mine is 36°, the slope safety can be ensured.