Study On Mechanical Properties And Stability Of Earth Rock Mixture

The mountainous area is rich in resources,attracting more and more engineering projects to enter,and the slope stability is an inevitable problem in the process of engineering construction.On the one hand,the limited land resources in the mountainous area make most of the project site selection must pass or close to the natural slope,on the other hand,the earth excavation in the process of engineering construction will destroy the natural shape of the original slope,causing damage to its rock and soil mass Disturbance increases the risk of slope collapse and sliding.The stability of the slope plays an important role in the safety of the project construction process and the use of the project after completion,so the research in this area is particularly important.On the one hand,the stability of the slope depends on the natural shape of the slope,on the other hand,it depends on the nature of the rock and soil mass of the slope.Among them,as a special geological body widely distributed in Yuntai mountain area,the mechanical properties and the selection of geotechnical parameters play an important role in the study of slope stability in Yuntai mountain area.Based on this,relying on the Evergrande health Valley Project of Yuntai Mountain,this paper takes the earth rock mixture and its formed slope as the research object,through the comprehensive application of various research methods,studies the mechanical properties and parameter acquisition methods of the earth rock mixture,the influencing factors of the slope stability,the slope cutting and reinforcement scheme of the side slope,etc.The research results of this paper solve the important problems in engineering technology,and provide reference for similar earth rock mixture slope.The main research results are as follows:(1)Based on the analysis of geological survey and design data,topography,geographical location,regional geological structure,formation lithology and hydrogeological conditions,the basic properties,distribution and genesis of the earth rock mixture in the study area are obtained.(2)the permeability coefficient k = 0.2 M / D of the soil rock mixture is obtained by the double ring water permeability test of the soil rock mixture in the study area;the shear strength parameter value c = 2.4 k Pa and the internal friction angle φ = 47.7 ° are obtained by the in-situ horizontal push shear test;the particle grading of the soil rock mixture is obtained by the indoor screening test and the cumulative curve of particle size grading is drawn.Combined with the measured natural angle of repose of the slope,the dynamic cone penetration in the field,the engineering analogy with similar geological bodies,and the establishment of slope model in critical state to invert the shear strength parameters of the earth rock mixture,the reliability of the shear strength parameters of the earth rock mixture obtained from the in-situ horizontal test is verified.(3)according to the geological conditions of the site,the slope geological model of the earth rock mixture is established.According to the geological model,it is transformed into a numerical simulation model.The calculation method of strength reduction is used to simulate and analyze the influence of the rock content and the size of block stone on the slope stability of the earth rock mixture.The specific performance is as follows: the stability of the earth rock mixture slope increases with the increase of the stone content in the earth rock mixture,but the growth trend of the safety factor of the slope is not the same due to the different spatial distribution of the block stone;when the stone content is the same,the stability of the slope will not change with the size of the block stone in the earth rock mixture,but the displacement range of the slope will increase with the size of the block stone When the slope is reduced,the shape of the slip zone will change.(4)According to the needs of engineering construction,the slope in the study area needs to be reinforced after cutting.Based on the analysis and calculation of the stability of four typical sections and side slopes,it is considered that the relatively short side slopes are in a stable state at a slope ratio of 1:1,and the rest of the slope surfaces are supported by prestressed anchor cables and lattice beams.