Optimization Study On Peripheral Joint Of Arc Dams

In this paper, I established the model of a variety of arch dams with artificial jointfinite element model based on the engineering background of a certain level of morethan200m high arch dam. Study the influence of material constitutive model, position，elevation，depth，angle，friction coefficient to the peripheral joint.Studies have shown that using elastic-plastic material model in the overall stresslevel is lower than the linear elastic model. After introducing the plastic material intothe model, the arch dam stress distribution law more in line with the actual situation.Through the analysis of no joint model, completely peripheral joint model (that is thejoint on both sides and bottom) and only set bottom seam scheme we can see that jointschemes all can effectively reduce the arch dam stress concentration phenomenon, butthe joints of different parts of dam body make different effect on the stability of dam.With the complete peripheral joint scheme completely cut off the dam and thesurrounding contact, reduce the integrity of the dam, make the joint surface open easily.Only set bottom seam scheme can reduce the dam heel stress concentrationphenomenon, and not completely cut off the dam body, to a certain extent to ensure theintegrity of the dam.Joint height should be selected in the distance within the high40m range relativeelevation of the dam percentage is16%, the joint surface more closer to the bottom themore better effect it will make.Joint surface state unchanged and keep the consolidationclosed state after more than a quarter section width. The joint surface more deep themore better effect it will make. Within the scope of the reasonable joint plane angle, themore tilt to the bottom surface of the upstream direction the better improve effect is.The greater the coefficient is the joint surface more stable.