A new computational model for critical height of reinforced slope is presented based on kinematical approach. A rotational failure mechanism is used and the failure surface is assumed to be a log-spiral surface. In this method

The principle of quasi-cohesion and friction-bar theory are both introduced into the limit analysis of reinforced slope. The SQP method is employed in the optimization scheme. Comparing to the previous experimental results

it is found that the critical height with the composite reinforcement mechanism is slightly higher than that with simplex reinforced theory; and it is more close to the experimental values. In order to evaluate the influence of seismic force

a case study is given. Results show that quasi-cohesion theory is more efficient

while friction-bar theory can be omitted. The proposed method will provide some beneficial guidance for critical height design of reinforced slope.