粘性土地盤における群杭の水平大変形挙動の実験的検討 AN EXPERIMENTAL STUDY ON LARGE LATERAL DEFORMATION BEHAVIOR OF PILE GROUPS IN A GROUND OF COHESIVE SOIL
粘性土模型地盤を用いて4本と9本の正方配列の群杭の大変形をともなう水平載荷実験を実施した. また, 群杭効率を把握するための単杭の水平載荷実験も実施した. 実験結果にもとついて, 粘性土地盤における群杭の列ごとの荷重分担率を算出し, 水平大変形挙動について考察した. その結果, 9本群杭よりも4本群杭が地盤強度の影響を大きく受けることが明らかとなった. また, フーチング変位率, 群杭本数と地盤と杭の相対剛性にもとついた, 群杭効率を求めるための経験式も提案した.
Lateral loading tests on pile groups of four and nine piles arranged on square grids were performed using a model ground of cohesive soil, which resulted in large deformation of piles. In addition, lateral loading tests on a single pile were also performed in order to clarify the efficiency of pile groups. Based on the results, the load burden ratio for each row of grouped piles was calculated, and the large lateral deformation behavior of the piles was studied. It was found that the group of four piles was more significantly affected by the ground strength than the group of nine piles. Furthermore, empirical equations to derive the efficiency of pile groups were proposed based on the footing displacement ratio, number of piles in a group, and relative rigidity between the ground and piles.
- 土木学会論文集 = Proceedings of JSCE
土木学会論文集 = Proceedings of JSCE 645, 223-233, 2000-03-21
Japan Society of Civil Engineers