车辆荷载作用下堆石坝动力响应分析  

Dynamic Response Analysis of Rockfill Dam under Action of Vehicle Load

作　　者：程小龙[1] 

机构地区：[1]重庆水利电力职业技术学院,重庆402160

出　　处：《水电能源科学》2016年第1期80-84,共5页Water Resources and Power

摘　　要：针对某堆石坝坝顶通车对大坝造成的影响问题,对加固后的大坝进行坝体通车荷载作用下的动力响应分析,研究了坝体在最危险水位组合下,不同车重、不同车速的多车辆荷载作用下的动拉应力、动压应力、动剪应力以及动荷载引起的永久变形的分布及变化规律,并根据动应力计算结果,建立了车重、车速与动力响应之间的关系。结果表明,随着车重的增加,灌浆区动主拉应力呈线性增长趋势,且随着车速的增加,灌浆区动主拉应力也呈线性增长趋势。结合灌浆条件的抗拉强度,根据拟合关系,反算得出允许通车的最大车重和最大车速为4.13t和24.44km/h,考虑安全裕度,建议坝顶通车限制车重和限制车速为3.44t、20km/h。Based on a certain rockfill dam project as well as the influence of the crest traffic on the dam,the dynamic response of the reinforcement dam under the action of traffic load was analyzed in this paper.The research contents include the dynamic tensile stress,dynamic compressive stress,dynamic shearing stress and the distributions and change rule of the dynamic loads caused by the permanent deformation under the combination of the most dangerous water level,different vehicle weight,different vehicle speed and different loads of many vehicle load.On the other hand,according to the calculation results of dynamic stress,this paper establishes the relationship between the vehicle weight,the speed and dynamic response.The results show that the dynamic principal tensile stress of the grouting zone is linear growth with the increase of vehicle weight,and the dynamic principal tensile stress of the grouting area is also linear growth with the increase of vehicle speed.According to the fitting relationship and combined with the tensile strength of grouting condition,it calculates that the crest to traffic on the dam＇s allowed maximum weight and speed is 4.13 tand 24.44km/h,respectively.Considering the safety margin,this research suggests that the crest to traffic＇s limit vehicle weight should be 3.44 t,and the limit speed should be 20km/h.

关 键 词：堆石坝 三维有限元 动力响应 水位组合 车辆动荷载 车速 车重 

分 类 号：TV641.4[水利工程—水利水电工程]