Research on the Bearing Mechanical Characteristics of Soil-rock Mixed Fill under Different Water Factor Effects
Soil-rock mix filled structure such as dam or embankment is inevitably affected by the complex natural environment,and its vertical bearing mechanical characteristics are the focus of attention in construction.Based on the similarity ratio theory of soil and rock in southwest mountainous area,a well-graded embankment model of soil and rock mixed filling is made.Three equally spaced soil pressure boxes are arranged in the adjacent to the center line of the embankment("left column"),loading plate center line("middle column"),and adjacent embankment and open slope("right column"),making them in the initial environmental state(Model A),rainfall saturated environmental state(Model B),and dry wet cyclic environmental state(Model C)respectively,and model load tests and numerical simulations are carried out by using the hierarchical loading program.The research results indicate that Model A and C have good structural properties,with obvious inflection points in the p～s curve and sudden damage.Model B has no inflection point in the load settlement relationship curve,and under the same load,Model Cs settlement is between Model A and B;Under the same layer conditions,the soil pressure at the center of the loading plate is greater than that of adjacent soil.The constraint on the"left"column is greater than that on the"right"column,which leads to asymmetric vertical stress diffusion in the soil rock mixed embankment under different environmental conditions.The soil pressure on the"left"column is greater than that on the"right"column and becomes more significant with the increase of embankment depth.Tshe loss of bearing characteristics on the free side slope intensifies the asymmetry of stress diffusion.
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