Study Of The Evaluation Of Highway Rock Slope Stability Based On The Wholly Grouted Anchor Force Monitoring

There are a lot of highway rock slopes exit in the side of mountainous area, these slopesstability influenced the safety of highway. Artificial produced highway rock slope has thecharacteristics of large in quantity, short in fund. The displacement monitoring method thataims at the slope failure can’t fill the bill. Bases on the present research situation，thisdissertation constructed the study method of stress monitoring route for rock slope. A newmonitoring method, which can evaluation the highway rock slope stability through the whollygrouted dynamometric anchor axial forces, has been established.This method can warningslope failure earlier, the monitoring pattern is simple, economical and in time early warningBases on the monitoring analysis of wholly grouted anchor axial forces to evaluate thehighway rock slope stress change and stability. The theoretical analysis、 numericalsimulation、centrifugal model test and by field tests were used to analysis the rock slopemonitoring principal and actual application effect. The study work on five aspects as follows:1. The relation between wholly grouted anchor axial force and safety factor for shearfailure and tension-shear failure rock slopes were established. And researched the changeregularity of anchoring force followed with rock parameters, so the theory for rock slopestability evaluation with wholly grouted anchor axial force monitoring could be received.2. Based on Mindlin′s solution of displacement with elastic space solid bearing theconcentrating force interiority, and combined with the existing literature description ofillusion mechanical characteristic form of wholly grouted anchor in structure plane，theformula of the axial force and shearing stress along the anchor were deduced，and thegeometry property theory solution of direction angle，anchoring depth and cross sectionproperty，is received based on the role of anchor in different rock mass.3．The FEM software Marc and fast lagrangian analysis of continuum software FLAC3Dwere combined to research the slope stress sensitive areas and the FLAC3D was used toresearch different forms of excavation and support of rock slope，and the method of strengthreduction is introduced in excavated rock mass，thus the relation with monitoring axial forceand safety factor were researched in further. The result can supply parameters of buried areasand warning axial force for wholly grouted anchor. 4．Through the geotechnical centrifuge model test，the real time curve between axialforces and acceleration was received. Based on the theory of shear failure，derived therelation with centrifugal acceleration and safety factor, and formula has been deduced.5．Taking four typical slopes along Dayu expressway and Guangshaan expressway as theexamples, the slope stability are evaluationed considering three aspects, the characterizationof engineering geology, the summarization of monitoring data, and the early warning axisforce. Consequently, the validity as well as the applicable value of the slope wholly groutedanchor axial force monitoring is verified from the viewpoint of practical engineering.The research from the dissertation suggest the method and practical process ofevaluation of rock slope stability and early warning，based on the wholly grouted anchor axialforce monitoring, which can offer references to the highway rock slope anchoring design andearly warning for the future.