The Application And Research Of Red Clay And Bentonite Plastic Concrete Diaphragm Wall In The Earth-rock Dam

This paper presents a comparative experimental study on the influences of red clay and cement content on concrete performance,comparing three series and fifteen sets of different mix proportion,focusing on the behaviors of plastic concrete in compressive strength,splitting tensile strength,bending strength,elastic modulus,slump,diffusion,and permeability coefficient.Then combined with Duncan-Chang(E-B)Model,using the finite element software Ansys workbench to earth dam model three-dimensional simulation calculation,in-depth analysis summary of red clay and bentonite plastic concrete cut-off wall of earth dam stress deformation and seepage control effect,and considering the soil areas in Yunnan.The cement content of the three series was 120,150 and 180 kg/m3;the red clay content of five sets for each series 0,50,100.150 and 200 kg/mJ.The following conclusions:(1)Test results showed that for the plastic concrete of the three series with a certain fixed cement content,as its red clay content was increased from 0 to 200 kg/m3 its elastic modulus was decreased by 45.3,23.0 and 14.6%for respectively,and its coefficient of permeability decreased by 57.8,56.6 and 78.1%respectively,showing a steep dropping trend.And its corresponding slump,diffusion and compressive strength,splitting tensile strength and bending strength at 28 d age.all showed dropping trends but at different rates.For the plastic concrete of different series with a certain fixed red clay content,as its cement content was increased from 120 to 180 kg/m3,its elastic modulus was increased by 107.6.116.7,149.2.184.8 and 224.5%respectively and a significant increase of more than 30%observed in these three strength parameters.In particular,when its cement content exceeded 150 kg/m3.all its strength parameters took a larger increasing rate,its elastic modulus decreased much slower,and its slump,diffusion and permeability coefficient grew at a considerably greater rate.Furthermore.the plastic concrete achieved an optimal performance in the condition of cement content of 150-180 kg/m3 and red clay content of 150-200 kg/m3.(2)The red clay and bentonite plastic concrete cut-off wall of maximum compressive stress and the maximum tensile stress value is the optimal mixture ratio does not exceed the strength of plastic concrete,so the red clay and bentonite the stress of the plastic concrete cut-off wall is safe.The study found that the red clay and bentonite plastic concrete diaphragm wall of earth-rock dam.earth-rock dam downstream of the dam deformation is reduced,the upstream deformation increases.the dam of large and small primary stress increase;in the normal storage level runtime leakage from 100370 m3/a drop of 4970 m3/a,seepage control effect is remarkable.