ANALYSIS OF DAM UNEVEN SETTLEMENT DUE TO EXTENT OF ROCK DISSOLUTION IN DAM BASE AT HYDROPOWER PROJECT

The stability of dam would reduce after rock dissolution occurs at the dam base.Taking a project for example,this paper analyzes the uneven settlement of dam at different dissolution degrees of dam base rock mass. The paper uses a three-dimensional numerical analysis. The result of calculation can show the following findings: the maximum displacement on dam top will be 10 cm if a strong dissolution occurs at dam base. The maximum displacement on dam top will be 5.5 cm if a middling dissolution occurs at dam base. The maximum displacement on dam top will be 4 cm if a slight dissolution occurs at dam base.The more serious of dam base dissolution,the more serious degree of uneven settlement in dam.At the same degree of dissolution,uneven settlements of the dam heel will be of the most serious,uneven settlement of the dam top will be of middle serious,uneven settlement of the dam toe will be of slight.