Stability Analysis Of Locked Slope And Research On Mechanical Properties Of Locked Section

As a common geological rock mass in nature,the slope with locked section structure will show the characteristics of short landslide time and long landslide distance when it is damaged due to its own structural characteristics.And when it is disturbed by the outside world(such as earth-quakes and rainstorms),it is easy to evolve into a highspeed debris flow landslide,causing huge casualties and economic losses.Therefore,in order to explore the stability of the slope with the locked section structure and the mechanical mechanism of the locked section in the process of controlling the stability of the slope,indoor uniaxial tests were carried out,assisted acoustic emission and DIC counting,and the experimental results were analyzed.The main research contents of this paper are as follows:(1)In order to explore the stability calculation method of the slope with the locked section structure,combined with the principle of virtual work and the structural characteristics of the slope itself,the virtual velocity is given to the slope and the locked section.By calculating the maximum elastic strain energy that the locked segment can accumulate,its deformation rate and internal energy dissipation power can be reversed.And according to the relevant flow law,the virtual velocity and internal energy dissipation power of the locked section and the rock slope are combined,and finally the calculation formula of the safety factor of the locked slope is successfully deduced.(2)For samples with different locked section lengths and angles,indoor uniaxial compression experiments were carried out to analyze various mechanical parameters of the samples during the loading process,and multi-factor analysis was carried out for the indicators affecting the compressive strength of the samples.Based on the matrix analysis of MATLAB,the influence of the geometric characteristics of the tensile section and the creep section of the sample on the overall strength of the sample is quantified,and the geometric distribution of the prefabricated failure section when the uniaxial compressive strength of the sample is the smallest is solved.(3)The acoustic emission signals collected in the experiment were processed for data processing.Through processing methods such as acoustic emission AE count,accumulated AE count,acoustic emission b value characteristics,and RA and AF sample shearing and tensile failure signal identification characteristics,each failure stage of the sample is quantitatively divided.The internal crack propagation of the locked-type specimen during the rupture process was analyzed,and it was found that with the increase of the angle of the locked section,the specimen gradually showed the structural characteristics that it was difficult to close in the early stage of loading and easy to rupture in the later stage.(4)Combined with DIC technology and the theory of maximum circumferential tensile stress,the strain displacement field of the locked section and the expansion direction of the prefabricated failure section are analyzed.The SVM classification prediction model is introduced to predict the final failure form of the locked section according to the geometric characteristics of the locked specimen.(5)Using finite element simulation software,a large number of slope models with different locking section lengths,locking section shear modulus,and locking section angles were constructed,and the corresponding safety factors were calculated,and the theoretical and experimental results were simulated and verified.