基于实测垂线资料的山口岩大坝变形分析

Deformation analysis of Shankouyan dam based on measured vertical data

建筑物除需要进行垂直位移观测和水平位移观测外,还需要进行挠度观测,这对混凝土大坝,特别是双曲拱坝尤为重要.所谓挠度观测就是指建筑物垂直断面内各个高程点相对于底部基点的水平位移变化,垂线就是一种观测挠度的简便有效手段.垂线监测作为大坝变形监测的重要手段,一直以来都是大坝变形安全资料分析、评价的关键项目.垂线监测主要以正、倒垂线法实现坝体水平位移监测.本文以山口岩碾压混凝土双曲拱坝近4年来垂线实测资料为基础,初步讨论和评价坝体水平位移变化规律及坝体稳定性,环境量、库水位的变化直接影响着坝体水平位移的变化.通过对实测垂线监测数据的分析,认为山口岩大坝处于稳定变化态势.

In addition to the need for vertical and horizontal displacement observations,buildings need to be observed for deflection,which is particularly important for concrete dams,especially the double curved arch dams. The deflection observation refers to the horizontal displacement of each elevation point in the vertical section of a building relative to the base point of the base,and the vertical line is a simple and effective means to observe the deflection. Vertical monitoring,as an important means of dam deformation monitoring,has always been a key project for dam deformation safety data analysis and evaluation. Vertical line monitoring mainly uses horizontal and vertical plumb line to monitor horizontal displacement of dam. Based on the measured data of the vertical line of Shankouyan RCC double curved arch dam in the last 4 years,the variation of the horizontal displacement of the dam and the stability of the dam body are discussed and evaluated. The change of the horizontal displacement of the dam is directly affected by the changes of the environmental quantity and the water level of the reservoir. Based on the analysis of measured data,it is considered that the Shankouyan dam is stable.