Abstract:Based on the progress of the case study conducted on high slopes of domestic nuclear power plants, a high soft-rock slope that interacts with clay in a nuclear power plant has been selected as an example in this study to comprehensively analyze the dynamic amplification effect, seismic performance, and reinforcement effect under earthquake action using various methods. Initially, we use a pseudo-static method to obtain a preliminary reinforcement design of the slope. Next, we analyze the dynamic amplification effect of the slope as well as the dynamic response and seismic performance of the retaining structures based on the shaking table test and numerical calculation results. Furthermore, we discuss the optimization value of the seismic parameters of the slope. The research results denote that (1) the acceleration amplification factor of the in situ slope increases with an increase in height, the magnification factor of mudded intercalation after saturation is greater than that before saturation, and the maximum value of the factor in the horizontal direction is 1.90; (2) the dynamic amplification factor significantly decreases after reinforcement, and the maximum factor in the horizontal direction is 1.31, whereas the maximum factor in the vertical direction is 1.0 (note:no amplification effect in the slope below the anti-slide pile with the anchor cable indicates that the seismic performance of high soft-rock slope is good when using an anti-slide pile with an anchor cable and the anchor-cable framework); (3) the overall seismic performance of the slope is good for PGA=0.21g, and only the force value of the anchor cables at the top and middle parts of the slope exceed the design value by up to 20% and 5%, respectively; and (4) the acceleration amplification factor distribution obtained via numerical calculations is in good agreement with the shaking table test results. Furthermore, the acceleration amplification factors obtained by the two methods are very close. The research results can provide technical support to conduct seismic safety evaluation and obtain engineering design for high and steep soft-rock slopes in case of nuclear power plants.