Dual criterion-based dynamic evaluation approach for dike safety

Seepage failure and slope instability in dike engineering are the most common dangerous cases which can easily lead to the break accident. The two dangerous cases have remarkable features such as complex causes, many influencing factors and strong uncertainty. The advantages in the safety factor method and the reliability analysis method are integrated. A dual criterion, which combines the certain index (safety factor) with the uncertain index (reliability), is proposed to evaluate the seepage and stability safety of dike engineering. The dynamic determination approach for the safety status of dike engineering and the corresponding dangerous water level threshold is developed. A representative section of one actual dike engineering is taken as an example. The seepage and stability safety of dike section is analyzed. The more comprehensive and objective evaluation results on service safety status and development trend are obtained. The determined threshold of dangerous water level, which can ensure the service safety of dike engineering, is very helpful to guide the scientific management of dike engineering.