Abstract

In order to make the comparision of bearing capacities and economical effected by the under-reamed over uniform large diameter piles, the author has conducted a lot of experiments on the sites of Marugo Foundation Co., Japan. The piles used were grouped into two groups: under-reamed and uniform piles. All of piles were tested by loading test, calculated the volum of excavated soil and volum of concret. Some important conclusions of bearing capacities and economics were drawn out.