A newly developed 'Compacted Bulb Foundation Method' and its application

新开发的“压实灯泡基础法”及其应用

基本信息

批准号：
07455193
负责人：
TAKADA Naotoshi
金额：
$ 3.01万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455193/
关键词：
Bearing capacity Spread foundation Coefficient of subgrade reaction Centrifuge model test Impact load Compaction Ground deformation Sandy soil 新工法

项目摘要

Heavy tamping is one of ground improvement technique for loose sandy ground and gravelly and rock waste fill. This method generally aims at uniformly compacting the whole ground, however, we found that a high density compacted area bulbously grew up beneath the tamping point by ram blow. The purpose of this study is to investigate the development and application of 'Compacted Bulb Foundation Method', which applies heavy tamping to the spread foundation. A series of centrifuge model tests was carried out to investigate effects of ram mass, ram base area, number of blows, number of passes and foundation base area on characteristic of bearing capacity of compacted dulb foundation.Main conclusions are : 1)ultimate bearing capacity of compaction bulb foundation increases more than 200 times and coefficient of subgrade reaction increases the number by 10 times in comparison with initial ground, 2)under ram mass less than 20t, the ground tamped by ram having large base area than that of foundation denotes large bearing capaci, 3)inversely, under ram mass more than 40t, ground tamped by ram having large base area than that of foundation denotesless bearing capacity, but this tendency can guess that degree of compaction of backfilling is small, 4)larger base area of ram can have high bearing capacity under the same ram mass. From these results, a design procedure of this method using the coefficient of subgrade reaction and the allowable settlement was proposed.

重污染是宽松的沙质地面和砾石和岩石废物填充的地面改进技术之一。这种方法通常旨在均匀地压实整个地面，但是，我们发现高密度压实的区域通过RAM吹出在厚度下的厚度下长大。这项研究的目的是研究“压实灯泡基础方法”的开发和应用，该方法适用于扩散基础。进行了一系列的离心模型测试，以调查RAM质量，RAM基本面积，打击数量，通行证和基础基础面积对紧凑型Dulb基础的承载能力的特征的特征的影响。MAIN结论是：1）压实球的终极轴承能力的能力：2）在200次和距离的范围内增加了较小的距离，比相比增加了2次，比相比增加了2次，比相比增加了2次。通过具有大基础面积的RAM表示大轴承的大型，3）反相，在RAM质量超过40吨的情况下，由RAM的地面比具有较大基础的RAM染色，而不是基础的无用轴承能力，但是这种趋势可以猜测，反填充的程度很小，4）较大的RAM的基本面积在同一RAM下具有较高的RAM的能力。从这些结果中，提出了该方法的设计程序，并提出了使用子级反应系数和允许结算的系数。