Study On High Slope Stability And Final Slope Angle Optimization Scheme

Compared with underground mining,open-pit mining has significant advantages such as high degree of mechanization,safe working environment and low transportation cost.Currently,most mineral resource mining in the world is based on open-pit mining,and the stability of open slope is the main problem faced by open-pit mining.Due to the continuous and rapid development of China’s economy,almost all mining slopes have a tendency to develop towards the high slope,and the main problem to be considered in the high slope is the design of the final slope Angle,because the design scheme of the final slope Angle directly affects the economic benefits of mining enterprises and the life safety of construction personnel.In this paper,a domestic research and eventually end slope stability of open pit slope slope Angle optimization scheme as the research subject,combined with mine possible factors that affect slope stability,the final slope stability analysis,and according to the analysis results,the slope of the original design reasonable slope Angle optimization scheme is put forward.(1)through the engineering hydrogeological survey and field exploration results,the typical section is determined to represent the geological profile and geometric parameters of the whole slope,and then the rock mechanics parameters are obtained through the indoor rock mechanics test,providing data support for the stability analysis of the slope.(2)an analytical model for judging the potential sliding surface of slope is established by using the markov distance method.Based on the data of field investigation and previous research results,it is concluded that the ultimate sliding surface of slope is circular arc.(3)because the blast wave generated by blasting vibration will decay into seismic wave,this paper calculates the impact coefficient of blasting vibration by combining the sadovsky formula and the calculation formula of seismic response coefficient.Based on the calculation formula of seismic influence coefficient in seismic building design code,the seismic influence coefficient of slope is calculated by combining the peak acceleration of seismic wave and the natural vibration period of slope.Due to blasting vibration analysis and crustal movement are produced by earthquake wave,thus can be found by comparing the earthquake influence coefficient is less than the blasting vibration effect coefficient,and long-term effects on mining slope blasting vibration,assume that if under the seismic effects of blasting vibration in instability and failure of slope is not going to happen,might happen in the region under the action of earthquake damage will not occur,so this paper only considering the influence of blasting vibration on slope stability,and in the subsequent to the slope safety coefficient calculation,blasting vibration effect coefficient into the slide software to calculate the results.(4)based on the two-dimensional numerical simulation software of slide,the limit equilibrium method is adopted to determine that there is a certain gap between the safety coefficient of the slope and the allowable safety coefficient of 1.25 after the seismic load is imported into the slope,so as to determine that the slope is in a relatively stable state.(5)using the coupling modeling technology of ansys software and flac3 d software,the slope calculation model was constructed,and the stress and displacement analysis of the slope was carried out.From the analysis results,it can be seen that the overall displacement of the slope is small,which is reflected in the subsidence of the upper part and the displacement of the lower part.There is local tension in the slope,which is mainly concentrated on the top of the slope and some steps,but not greater than the tensile strength of the rock mass,so the tension area of the slope will not cause tensile failure.It can be seen from the intensity stress than the cloud diagram that the rock mass above the fault is more stable.(6)by the result of the high slope stability analysis,put forward the corresponding optimization scheme of the slope stability,rock mass structure is relatively stable fault the advantage of the upper slope as the final slope Angle optimization area,will be weaker compared with the fault of the bottom slope rock mass structure as the final slope Angle optimization disadvantage areas,use of changing the way the upper bench slope Angle,slope Angle to change the advantage area,until the slope safety factor is close to or reaches 1.25 to complete the optimization.Using this optimization scheme,finally determine the fault zone 13-17 steps remain the same,fault zone 1-12 steps above steps take 72 ° to 73 ° slope Angle(specific value according to the area of the selected section),and platform width,height remains the same,the final slope Angle for 42 ° to 43 °(specific value according to the area of the selected section)design method of optimal design for the final slope.