A research adaptability and practical application of Compacted Bulb Foundation Method

压实球地基法的研究适应性及实际应用

基本信息

批准号：
09555154
负责人：
TAKADA Naotoshi
金额：
$ 2.88万
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：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555154/
关键词：
Bearing capacity Spread foundation Coefficient of subgrade reaction Centrifuge mode test Impact load Compaction Sandy soil Innovative technique 地盤変形

项目摘要

Heavy tamping is one of ground improvement technique for loose sandy and gravelly ground 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 adaptability and practical application of 'Compacted Bulb Foundation Method', which applies heavy tamping to the spread foundation. Firstly a series of centrifuge model tests was carried out to investigate effects of kind of soils on bearing capacity of compacted bulb foundation. Secondly a series of centrifuge model tests was carried out to investigate effects of tamp condition ( ram mass, ram base area, drop height and number of blows) and foundation bed area on the bearing capacity characteristics in miniaturizing this method in order to use practically.Main conclusions are as follows : 1) within the material which changed maximum grain size and fine content which used this study, there is seldom the effect of kind of soils on this method, 2) it is possible to obtain sufficiently large bearing capacity, even if the tamp condition is miniaturized, 3) the bearing capacity of the compacted bulb is more dependent on total momentum than total tamping energy, 4) coefficient of subgrade reaction is larger, as ram base area is larger. From these results, the following are proposed : design method in using compacted bulb foundation method practically, necessary condition of the construction machine and construction management technique.

重型润肤室是宽松的沙质和砾石地面和岩石废物填充物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”的适应性和实际应用，该方法适用于扩散基础。首先，进行了一系列离心模型测试，以研究种类的土壤对紧凑型灯泡粉底轴承能力的影响。其次，进行了一系列的离心模型测试，以调查TAMP状况（RAM质量，RAM基本面积，跌落高度和打击数量）和基础床面积对小型化的轴承能力特征以实际使用的轴承能力特征的影响，以便实际使用的结论如下。大轴承能力，即使缩小性条件是小型化的，也3）压实球体的轴承能力比总动量更依赖于总动量，4）4）子分级反应系数也更大，因为RAM基座面积更大。从这些结果中，提出了以下内容：实际上使用压实灯泡基础方法的设计方法实际上是建筑机器和施工管理技术的必要条件。