堆石坝坝顶行车二维动力响应分析

Two-dimensional Dynamic Response Analysis of Traffic on Rockfill Dam Crest

为了验证面板堆石坝坝顶通车的可行性,采用大型非线性有限元软件ABAQUS,对通车荷载作用下的堆石坝坝顶(帷幕灌浆加固后的)动力响应进行了分析,研究了坝体在不同水位、不同车速条件下的大坝动力响应规律,并分析了灌浆区材料的敏感性。结果表明,在相同水位条件下,灌浆区的动应力随车速的增大而增大;帷幕灌浆区的最大动主拉应力随灌浆区材料强度的降低而减小;在一定车速条件下,堆石坝坝顶通车对坝体产生的变形很小,产生的动主拉应力不足以使灌浆区产生裂缝,说明堆石坝坝顶通车的方案是可行的。

In order to indentify whether the traffic can pass the rockfill dam crest or not,the non-linear finite element software ABAQUS was adopted to analyze the dynamic response at the action of the traffic load.The influences of different speed and different water levels on the dam body dynamic response were studied.And then the sensitivity of grouting section material was analyzed.The results show that the dynamic stress of the grouting zone increases with the increase of the vehicle speed under the condition of the same water level.The maximum principal dynamic tensile stress of the curtain grouting zone decreases with the decreasing of the strength of materials.The deformation of the rockfill dam is small when the traffic passing the dam.The principal dynamic tensile stress is not enough to make a crack on the grouting area.So,the scheme of traffic on the rockfill dam crest is feasible.