水工金属结构防腐设计的粗糙度参数确定

水工金属结构基体表面粗糙度参数是防腐设计中的一项重要指标。由于行业内各种规范对此缺乏确定的选用标准 ,给防腐处理的检验及验收带来困难。依据国家标准、国际标准、行业标准的规定 ,以及检测仪器、检测方法特点 ,分析了 3种粗糙度表示法的选用标准和内涵 ;提出了粗糙度检测的方法 ,并且建议水工金属结构防腐设计及施工统一选用Ry(轮廊最大高度 )标准

Monitoringon periphery fracture deformationof TGP reservoir area and analysis of seismic activity

In order to know the dynamic state of earth crust in the Three Gorges reservoir area and its surrounding area so as to predict and forecast possible earthquakes in these areas,14 fault-crossing deformation monitoring lines are provided in the Three Gorges reservoir area to mainly monitor relative vertical and horizontal displacements in these fracture zones.13 precise leveling lines are arranged to measure vertical displacements.These leveling lines are basically perpendicular to the fault directions or cross them.One precise indoor distance-measuring datum line is arranged in Zhouping to monitor horizontal displacements.Through comprehensive analysis of monitored data of topographic deformation on the surveying lines and the data measured before,it is found that the variation of elevations at the points on all the surveying lines are less than 2 mm.According to the observed results of fault-crossing deformation in several years in the Three Gorges area,there have not been remarkable vertical lift and subsidence or suddenly violent saltation.The tectonic activities of the faults are stationary and slow.