基于实测变形的混凝土坝横缝三向变形监控指标拟定

Development of Monitoring Index of Transverse Joint Three-way Deformation of Concrete Dam Based on Measured Deformation

针对大坝工程中通常只监测横缝开合度的变化而很少关注其在水平向、竖直向的变形协调问题,提出以相邻坝段水平位移和垂直位移差值来反映横缝错动量,然后结合开合度监测资料采用典型小概率法和云模型法拟定横缝三向变形监控指标,并以某水利枢纽重力坝变形监测资料为例,验证了该方法的效果。结果表明,本文提出的拟定横缝三向变形监控指标的方法具有可行性,典型小概率法和云模型法两种算法拟定的监控指标较接近,其中典型小概率法拟定的监控指标范围略小于云模型法,且横缝错动量极值均在监控指标范围内。

In view of the problem that only the change of the open degree of the transverse joint is usually monitored in dam engineering and little attention is paid to its deformation coordination in horizontal and vertical directions,the difference between horizontal and vertical displacements of adjacent dam section is proposed to reflect the dislocation momentum of the transverse joint.Combined with the open degree monitoring data,the typical low probability method and cloud model method were used to determine three-way deformation monitoring control indices of transverse joints.Taking deformation monitoring data of a certain water conservancy hub gravity dam as an example,the effect of this method was verfied.The results show that the proposed method is feasible,and the proposed two algorithms are relatively close to the proposed monitoring index.The monitoring index range by the typical low probability method is slightly smaller than that of the cloud model method,and the extreme values of the transverse joint dislocation are all within the monitoring index range.