Study on the Fracture Signs of Metamorphic Rock Bedding Slope and the Range of Slope Excavation Instability
The study of the instability mode and range of metamorphic rock bedding slopes is of great significance and engineering application value in ensuring the safety of people's lives and property.Taking the metamorphic rock bedding slope to be excavated at a petrochemical site in a certain industrial park as the research object,the geological environment and geotechnical characteristics of the experimental section slope were investigated,and an indoor similarity test model for slope excavation instability was established to obtain signs of slope instability and fracture and their formation mechanisms.The results show that for slopes with mainly hard structural planes,the visible trace length of joint development is mostly 3.0-7.0 meters,mostly in an open state;The deformation and failure modes of the slope are erosion erosion and sliding tensile cracking on the slope surface;Among them,slip tensile failure is a typical and main mode of instability and failure of such slopes;When the slope is excavated at a gentle inclination angle(30°),the instability range of the 3-5 level slope is large,and the crack opening width and depth extending into the interior of the slope are both large,posing a multi-level instability risk.The research results can provide useful support for establishing scientific and reasonable methods for predicting and evaluating slope stability and instability range.
metamorphic rocksbedding slopesigns of ruptureslope excavation instability range
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