Analysis Of Roller Compacted Concrete Dam Seepage And Stress Fields

Roller compacted concrete dam has being used increasingly in water works. But,due to construction conditions, roller compacted concrete dam often occurs weakintercalated layers, Which may lead to changes in the distributions of displacementand stress in the structure, and make the weak layers easily to be the failure controlpositions of the dam structure; And because of the existence of quantities ofhorizontal layers, it makes the dam's seepage flow characteristic, seepage flowcontrolling and construction plans complicated, and the layers become the possibleseepage flow concentration access and the weak planes of stability against sliding.Based on the seepage flow characteristic of the roller compacted concrete dam,the fractured flow model is used to simulate the effect of the layer in order to analyzethe plane steady seepage flow problem about the roller compacted concrete damquantitatively and to probe the distribution law of seepage flow body force in theroller compacted concrete dam in this paper At the same time, an equivalentcontinuum constitutive model in which the effect of layer on the stress analysis istaken account comprehensively is adopted to calculate the interlaminar stress of rollercompacted concrete dam and also carry out the stress analysis of roller compactedconcrete dam in accordance with two alternatives of which the water load is appliedwith the form of seepage flow body fore and with the form of distribute load. Theresults show that, due to the effect of the layer, an obvious difference of the iso-potential line distribution exists between the roller compacted concrete dam andgeneral concrete dam when steady seepage flow field analysis is conducted and theseepage flow quantity in the roller compacted concrete dam increases remarkbably,and that the tensile stress in the heel of dam is higher by the water load in the form ofthe seepage flow body force than that of distribute load, thus being more unfavorableto the crack-resistance of the dam body.