Study on Piled-Raft Foundation under a Detached House

独立式住宅下桩筏基础研究

• 批准号: 18360267
• 负责人: TOMINAGA Koji
• 金额: $ 6.13万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360267/
• 关键词: Detached house; Steel pipe pile; Timber pile; Piled-raft foundation; Vertical bearing caned; Lateral resistance; Finite element method; Estimation of performance; 圧入力〜貫入量関係

The purpose of this study is to deal with the structural design of the piled-raft foundation to supporting a detached house constructed on soft ground. The timber piles, which are constructed by the press in method, are used for the piled-raft foundation. Thus, we should propose first the analytical methods for the behaviors of a tapered-pile under the vertical and lateral loads, because that the configuration of the timber pile is almost the tapered shape. In this study, the vertical and lateral loading tests were also performed on the tapered steel pipe piles and timber piles. Furthermore, comparisons were made between the final press-in load and the ultimate load from the vertical loading test From a series of studies, we obtained the lemming as follows:1. The results calculated by the proposed method for the press-in pile are in fairly agreement with the experimental results.2. Because that the ultimate bearing capacity from vertical loading tests was lager value than the final press-in loads, it is found out that the strength of soil surrounding the pile was in restoration while curing the 'pile.3. It is possible for the ultimate bearing capacity of the pile to be estimated from the final press-in load.4. The results calculated by the proposed method for the laterally loaded tapered pile are in fairly agreement with the test results, and indicate well characteristics that the soil surrounding the tapered pile is hardening by press-in pile.5. From the results analyzed by the tree finite element method, it is found out that the piles embedded length of 3 m are effective for the piled-raft foundation.

本研究的目的是处理软土地基上建造的独立式住宅的桩筏基础的结构设计。桩筏基础采用压入法建造的木桩。因此，由于木桩的形状几乎是锥形的，因此，我们首先应该提出锥形桩在竖向和横向荷载作用下的性能分析方法。本研究还对锥形钢管桩和木桩进行了竖向和横向加载试验。此外，还对最终压入载荷与垂直载荷试验的极限载荷进行了比较。通过一系列的研究，我们得到了旅鼠如下： 1．采用该方法计算的压入桩计算结果与试验结果吻合较好。 2．由于竖向荷载试验的极限承载力值大于最终压入荷载值，发现在养护桩的同时，桩周土体的强度也在恢复。 3．根据最终压入荷载可以估算桩的极限承载力。4．所提出的方法对侧向受载锥形桩的计算结果与试验结果吻合较好，很好地表明了锥形桩周围土体压入桩硬化的特征。 5．通过树形有限元法分析结果表明，桩筏基础的埋桩长度为3 m是有效的。

项目成果

Simulation of Vertical Test Result on Small Size Steel Pipe Pile by Using Finite Element Method

小尺寸钢管桩竖向试验结果的有限元模拟

• 发表时间: 2006
• 作者: Akihiko;Wakai
• 通讯作者: Wakai

小口径鋼管杭と木杭の支持力評価法に関する研究

小直径钢管桩和木桩承载力评价方法研究

• 发表时间: 2006
• 作者: Akihiko;Wakai;田村昌仁
• 通讯作者: 田村昌仁

Vertical Loading Test of Small Steel Piles and Timber Piles on Soft Ground for Houses (Part 2 Results of Examination)

房屋软土地基上小型钢桩和木桩的竖向荷载试验（第2部分检验结果）

• 发表时间: 2007
• 作者: Koji;Susuda
• 通讯作者: Susuda

軟弱地盤地域における小口径鋼管杭と木杭の鉛直載荷試験(その1 概要)

软土地基区域小直径钢管桩和木桩竖向荷载试验（第1部分概述）

• 发表时间: 2007
• 作者: Koji;Susuda;田村 昌仁
• 通讯作者: 田村 昌仁

Field, Press-in Test of Tapered Steel Pipe and Timbei Piles

锥形钢管和Timbei桩的现场压入试验

• 发表时间: 2007
• 期刊: Architectural Institute of Japan-Journal of Asian Architecture and Building Engineering Vol. 6, No. 2
• 作者: Koji;Tominaga
• 通讯作者: Tominaga