ABSTRACT
When the safety of the structure is evaluated, it is necessary to handle the soil modulus reasonably and quantitatively though it is known well that the soil modulus vary when various structures are designed intended for the soil and the bedrock. In the design that uses the safety factor in a past allowable stress method, it has corresponded by adopting the value of the safety side as a value for the design when uneven to the ground constant etc. However, it was a problem that the technique for evaluating how taking the value of the safety side logically and quantitatively had not been established.
