杭の先端支持力に及ぼす土被り圧と先端形状の影響に関する模型実験

概要

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In order to study the point bearing capacity of piles with under-reamed end, a series of model tests were performed by using the steel and mortar model piles in the pressurized model grounds. The test parameters include overburdening pressures of 200,400 and 600kPa and pile end shapes of the convergent angles of 30,45,60 and 90 deg. All model grounds with a relative density of Dr-90% were created by Toyoura sand. In the series of the mortal piles, the experimental results revealed that the first cracks on the end surface of the flat form of the enlarged base pile occurs when the applied load was between 50% and 60% of the failure load of the pile shaft. On the other hand, in the series of the steel model piles, it was found out that the relative end bearing capacity ratios between the under-reamed end pile and the straight pile with same base diamater were nearly constant values in spite of the different overburdening pressures. And in this test series, it was interesting to see the increase in the coefficient of bearing capacity which becomes less as the set surcharge pressure becomes greater.
一般社団法人日本建築学会の論文
2003-03-20