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根据密云水库白河主坝和潮河主坝３０多年来的沉降监测资料，选择有代表性的标点，绘制沉降过程线，进行回归分析，判断土坝变形是否正常；再通过绘制沉降量的横断面、纵断面和平面分布图，判断是否因沉降不均匀而产生裂缝。分析结果认为，两主坝的沉降是正常的，其沉降分布比较均匀，白河主坝最大沉降发生在桩号０＋３００ｍ断面处，潮河主坝发生在桩号０＋２００ｍ断面处，即均发生在最大坝高断面处，符合正常规律。
According to the monitoring data of the subsidence of the Baihe main dam and the Chaohe main dam in the Miyun reservoir over the past 30 years, representative representative punctuation points are selected to draw the settlement process line and carry out regression analysis to determine whether the earth dam deformation is normal. Then, , Vertical section and plane distribution map, to determine whether the settlement due to uneven subsidence cracks. The analysis shows that the settlement of the two main dams is normal and the distribution of the subsidence is relatively uniform. The maximum settlement of the main dam of Baihe River occurs at 0 +300 m section of the pile. The main dam of the Chaohe River occurs at the cross section of 0-200 m of the pile, High section, in line with normal laws.