Indonesia Conference Directory

One of the causes of failure of a dam structure is the occurrence of seepage triggered by high pore water pressure that occurs in the body of the dam. Pore water pressure can cause the shear strength of the constituent material to decrease. In the Panohan Dam seepage occurs on the downstream slope of the dam which can disrupt the security level of the Panohan Dam. The purpose of this research is to evaluate the pore water pressure and seepage in the body of the Panohan Dam by using two methods namely analysis using numerical method (finite element method) in the planning stage and analysis based on the reading of piezometer and v-notch instrument data that installed on the body of Panohan Dam. The results of the two analyzes are compared to determine the condition of pore water pressure and seepage when planning stage is still in accordance with current conditions. Pore water pressure and seepage analysis was carried out on the cross A - A Panohan Dam which indicated seepage on the downstream slope of the dam using several variations of reservoir water level. The comparison results show that pore water pressure in numerical modeling is greater than the pore pressure value based on current piezometer readings. However, the seepage discharge of the v-notch readings on the dam body is greater than the seepage discharge that calculated by the numerical model. Based on the total amount of seepage discharge that occurs in the v-notch and measurements on several seepage spots on the dam body, Panohan dam is still safe from seepage problems that could disrupt the stability of the dam.