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为分析大坝坝顶道路通车对坝体及帷幕灌浆区的影响,在四种不同灌浆方案下,分析了坝顶道路行车条件下的大坝动力响应情况,坝体在车辆动荷载作用下不同灌浆面积时的动拉应力,以及动荷载引起的大坝永久变形分布及变化规律,并根据坝体在车辆荷载作用下的动力响应,探讨了车重、车速与动应力之间的关系。分析结果表明,在坝顶道路行车条件下,灌浆区的最大动主应力随灌浆区面积的增大逐渐减小,说明灌浆区面积越大对通车越有利;各灌浆方案下的坝体变形均较小,且变形分布均匀,未出现位移集中区;灌浆区动主拉应力随车重的增加基本呈线性增长;在坝高1/3范围内及以下全部灌浆时,坝顶路面车辆间距为10m,车速为20km/h时,建议通车车重不超过4.38t,限高1.90m。研究成果为工程实践提供了参考依据。
In order to analyze the influence of road opening on the dam body and curtain grouting area, the dynamic response of dam under the driving conditions of the dam top is analyzed under four different grouting schemes. The dam body is different under the dynamic load of the vehicle The dynamic tensile stress of the grouting area and the permanent deformation of the dam caused by the dynamic load, and the relationship between the vehicle weight, the vehicle speed and the dynamic stress is discussed according to the dynamic response of the dam under the vehicle load. The results show that the maximum dynamic stress of grouting zone decreases with the increase of grouting zone under the driving conditions of dam road, which shows that the larger the grouting zone is, the better the opening is. The deformation of the dam under each grouting scheme And the deformation distribution is uniform and no displacement concentrated zone appears. The main tensile stress of grouting zone increases linearly with the increase of the weight of the vehicle. When the grouting is within 1/3 of the dam height and below, the vehicle spacing of the dam top pavement is 10m, the speed is 20km / h, it is suggested that the traffic volume should not exceed 4.38t and the limit height is 1.90m. The research results provide a reference for engineering practice.