正常运行条件下坝顶公路行车对坝体的影响

Influence of Traffic in Dam Crest on Dam Body under Normal Operating Condition

针对坝顶行车对坝体造成的影响问题,考虑正常运行条件下,采用大型非线性有限元软件ABAQUS,研究了坝顶行车下不同车重和车速对坝体的动拉应力、动压应力、动剪应力及动荷载引起的变形分布及变化规律,并根据灌浆区动拉应力,分别建立了车重、车速与动力响应之间的关系。结果表明,灌浆区动主拉应力随车重的增加呈线性增长趋势,此外,灌浆区动主拉应力也随车速的增加呈线性增长趋势,结合灌浆条件下的抗拉强度,反算出通车限制车重和车速为4.32t和26.60km/h,在考虑安全裕度的情况下,建议坝顶通车限制车重为3.60t,限制车速为22km/h。

Based on the influence of the traffic in dam crest on the dam body,the dynamic response of the reinforcement dam under the action of traffic load was analyzed by large nonlinear FEM software ABAQUS.The deformation distribution and change rule of the dam body caused by dynamic tensile stress,dynamic compressive stress,dynamic shearing stress and dynamic loads were analyzed under conditions of different vehicle weight and speed for the traffic in dam crest.According to the dynamic tensile stress in grouting zone,the dynamic stress response relationship between vehicle weight and vehicle speed is established.The results show that the dynamic principal tensile stress in grouting zone increases linearly with the increasing of vehicle weight and speed.Based on the dynamic tensile stress,the relationship between the vehicle weight,speed and dynamic response were studied.The maximum weight and speed of vehicle which allowed to the dam were 4.32 tand 26.60km/h,respectively.It suggest that the limit weight and speed of the vehicle were 3.60tand22km/h.