Analysis of The Running State of Guizhou Guangzhao Roller Compacted Concrete Gravity Dam

摘要

The dam of the Guangzhao hydropower station is a full section RCC gravity dam,The maximum dam height of 200.5 m,crest length of 410 m,is currently the world has been built,in the construction of the highest RCC gravity dam.In order to understand and grasp the Guangzhao hydropower station RCC gravity dam running state,in the buried at different positions of the dam deformation monitoring,stress and strain monitoring,seepage pressure monitoring,such as monitoring instruments,monitoring the running state of the dam.This article through the Guangzhao of RCC gravity dam deformation,stress and strain,seepage in the early monitoring data analysis of osmotic pressure and joint operation,the level of the dam deformation and subsidence deformation is very small,much smaller than design value,the stress and strain monitoring show that the stress and strain measurement value is small,the stability of the dam.Dam section between the transverse crack in open state as a whole,have the effect of the induced slit dam design,the effect is better.Dam and on both sides of the slope rock and alveolar concrete and bedrock joint in good condition,contact state stability.In front of the dam before the main drain uplift pressure intensity coefficient between 0.042 ～0.134,the downstream the residual strength of uplift pressure coefficients between 0.031 ～ 0.214,either upstream or downstream anti-seepage curtain and drainage effect is good.Dam foundation uplift pressure,dam seepage flow and water relation is not obvious.Total water weir measured peak flow of 21.10 L/s,is far less than the dam seepage flow estimation.The dam runing in good condition.