江垭枢纽工程坝区变形监测网优化设计

江垭水利枢纽工程坝区监测网自1998年蓄水前建立以来，共观测过6次，监测数据完整地反映了不同水位条件下大坝周连岩体的变形性状，发现了水库蓄水后坝址区岩体抬升的异常现象。究其原因，主要是坝基岩体中存在热承压含水层，热水的补给点位于下游，且高于库水位，水库蓄水后，热承压含水层的扬压力增大，对不透水层基岩顶板有一定的顶托作有所致。对该坝区变形监测网从施工优化设计到资料初步分析的情况进行了简要介绍。

Optimization design on deformation monitoring network in dam area of Jiangya hydroproject

Since the monitoring network in the dam area of the Jiangya hydroproject was set up in 1998 before impoundment, total 6 observatios were carried out and the measured data reflected the deformation behaviours of the rock mass surrounding the dam under different water levels. It is discovered that the rock mass in the dam site rose abnormally after impoundment. The reason is that there exists a hot artesian aquifer in the dam foundation rock stratum and the supplement source of hot water is located in the downstream of the dam, higher than water level of the reservoir. After impoundment, the uplift pressure of hot artesian aquifer increases and produces a certain jacking function to top impervious foundation rock stratum. This paper presents the optimization design of the deformation monitoring network in this dam area and preliminary analysis on the monitoring data.