Remediation of Slope Failure by Compacted Soil-Cement Fill

Abstract

Remediation of a complete destroyed slope is often difficult because of various geotechnical challenges and different constraints at the site. Many solutions have been developed; however, not all stabilization methods are appropriate for every type of slope failure. In addition to the technical considerations, aesthetic concerns and sustainability have also become significant issues during the past decades because of global environmental concerns. The principle of multiple-criteria decision analysis (MCDA) will be helpful in the consideration of these alternatives when all criteria are considered simultaneously. In this study, it was concluded that compacted soil-cement would be the best solution for the site after MCDA procedures. This paper presents a detailed report to demonstrate the benefits of utilizing compacted soil-cement for the restoration of slope failure. Traditionally, compacted soil-cement stabilization has been used worldwide for embankment constructions to mitigate the constraints of problematic sites. When it is applied in a slope remediation, the stability of the reconstructed slope can be improved with the increased strength of the cemented material. The experience described herein indicates that slopes treated with compacted soil-cement not only successfully meet all the site criteria, they also display sustainable performance. Compared to slopes constructed with traditional stabilization methods, the slope in this case demonstrates superior performance. Based on field monitoring to date, the slope in the described case continues to maintain its structural stability and safety. The utilization of compacted soil-cement fill is a valuable and sustainable solution, particularly for those sites that have concerns with the disposal of impracticable silty debris waste.