Treatment and settlement analysis for soft rock dam foundation

The Xixiayuan project is a regulating reservoir in china. The concrete dam section is constructed on soft rock foundation. In this paper, we present the case study on the treatment for the soft rock foundation. The treatment includes the construction of concrete cut-off wall, reinforcement by dynamic compaction method, and installation of the stone columns. The treatment was justified by the field instruments installed in the foundation. The measured data show that the treatment can reduce significantly the settlement at the foundation. Moreover, layered settlement was employed in the analysis. The results demonstrate that very small total and differential settlement occurred in the foundation. The analysis illustrate the success of the treatment for the soft rock dam foundation, and useful for gaining experience for future designs and analysis.