Reliability study of pile group with rigid cap based on settlement

Based on the summarization that design theory of reliability is based on bearing capacity wholly, a new concept of reliability design based on settlement aiming at great super-long pile group is presented. Compression of pile body and stab deformation is considered in the settlement calculating model. After discussion about distribution regularity of calculating parameters, index of reliability is calculated by Monte Carlo method. An example shows that index of reliability would decrease with load level increasing; and it would increase with acceptable settlement increasing. But increase trend becomes slower.