Research Of Rock Cutting Slope Security Status Assessment Method Based On Deformation Condition

Rock cutting slopes are encountered in mountain highway construction, itsassessment of the security situation has been widespread concern in engineering, andnumerous studies have been carried out. In these studies, deformation monitoringmethods and the security situation in discrimination method based on deformationmonitoring data are considered to be one of the effective ways in the construction phasestability control and operational safety assessment, it becomes a research hotspot.Because of the complexity of the rock mass, many issues need to be solved, such as therational arrangement of monitoring points, the correlation of deformation and stability,how to determine the stability based on deformation data.In this paper, broken structure, layered structure (cis-dip structure), massivestructure three kinds of rock mass structure slope as the research object, using a largeuniversal finite element software ANSYS, deformation and steady state were studiedduring the construction and operation of cutting slope respectively. Through numericalsimulation analysis, the slope of three rock structure deformation data and stabilityfactor are calculated during construction and operation, displacement-stabilitycoefficient curve is established, displacement monitoring sensitive points which can bethe most appropriate Characterization of the slope security situation are founded bycurve fitting and other mathematical derivation method. Finally, according to therelationship between monitoring sensitive point deformation and slope stability andrelevant research results, the judgment of rock slope security status based ondeformation is developed. The results showed that: the broken rock structure rock slopeusually occurs arc sliding failure, the sliding surface through the toe; The dip structurerock slope usually occurs linear slide along the exposed bottom of weak layers; Themassive structure rock slope usually occurs two weak layers polyline tracing slide; Inthe body of three kinds of rock structure slippery slope can be used as monitoringsensitive point, but the deformation is in different sizes, the largest deformation point ofbroken rock structure slope is located in toe and crest within5~15m, the largestdeformation point of dip structure slope is located in exposed the soft layer and the topof the hill, the largest deformation point of massive structure rock slope is located in thebottom exposed the weak layer and a soft layer on top. Depending on the size of slope deformation, slope security risk can be divided into low-risk, medium risk, super highrisk.In this paper, the conclusions obtained have some theoretical significance andpractical value in the following aspects: using slope deformation monitoring data todetermine the security situation of slope, making predictions and warning on slopesafety risk early, protection of construction slope stability, reducing operational harm ofslope instability.