Study On Bedding Rock Slope Stability Of Highway In Mountainous Region

The engineering practice shows that the consequent rock slope is most likely to failure in the rock slopes,and it causes enormous loss of the engineering project and the life and belongs of people.The paper is based on the national science and technology support program "the process control and dynamic control technology of the subgrade of the highway in southwest mountainous area highway(2015BAK09B01)".The collapse of bedding rock slope in the section of chongqing-guiyang expressway was taken as an example to analyze the failure mechanism,stability calculation and engineering treatment design of bedding rock slope.Combined with the characteristics of the project,the construction process was monitored in real time to ensure the safety.Rotary drilling rig construction round anti slide pile and anchor cable was used for joint protection.By using Reinforcement scheme of FLAC numerical simulation,the reinforcement effect was evaluated.The main research contents are as follows:(1)The research status and treatment technology of bedding rock slope stability are summarized.On the basis of literature review and extensive investigation,two forms of instability of rock slope are summarized..(2)Based on the finite difference analysis method of FLAC,using the Mohr Kulun(Morh-Coulomb Model)criterion,a combination model of different slope angle,slope height and rock slope was established and effect of CIS layer slope safety coefficient is analyzed.The results show that : the safety factor of slope decreases monotonically with the increase of slope height and slope rate,and increases first and then decreases with the increase of dip angle of strata.The simulation results are consistent with the results obtained by the limit equilibrium method.(3)The collapse of bedding rock slope in the section of chongqing-guiyang expressway was taken as an example to analyze the failure mechanism,According to the characteristics of the project,the "eye of the eye" visual slope intelligent monitoring system is used to monitor the slope.According to the stability calculation and numerical simulation,the maximum displacement of the slope was analyzed.Monitoring data threshold was set,when the data exceeds the set threshold would be timely warning.Information of emergency decision making process and the purpose of setting up joint reinforcement scheme according to local conditions were achieved.(4)The simulation analysis of a bedding rock slope in the chongqing-guiyang expressway was carried out by FLAC.No protection after the collapse,After the protection(the anti slide pile and anchor cable are used to reinforce the stress field of the bedding slope)and the movement of displacement field were used to analyze and compare.It can be found that the stability of the slope is improved by the reinforcement of the pile and anchor cable of the bedding rock slope,which makes the stress more reasonable.The problems existing in the use of anchor(cable)or anti slide pile were solved.