Design Method to Rehabilitate Old Fill-type Dam Embankment Using Cement-mixed Muddy Soil

Abstract

Most of old fill-type dams were mostly needed the rehabilitation of the embankment by aging and accumulated with the muddy soil in reservoir that caused the water pollution and the loss of reserved water. In order to make efficient use of the muddy soil as the embankment soil, we have developed a new type method to rehabilitate the old fill-type dam embankment.
In this paper, we propose a new design method to rehabilitate the old fill-type dam embankments by constructing the sloping core and shell zones using the cement-mixed muddy soil for reinforcing the damaged embankment. The feature of the design method are introduced the strength control system considering the effect of the grading and the water content on the strength of cement-mixed muddy soil, and adopted the strength parameters (c', φ') using the bi-linear type failure criterion obtained from the tri-axial compression tests to evaluate exactly the strength characteristics at wide range stress levels of the cement-mixed muddy soil.