Study on Three-dimensional Bearing Capacity on Level and Slope Grounds

平坡地基三维承载力研究

基本信息

批准号：
04650445
负责人：
NARITA Kunitomo
金额：
$ 0.77万
依托单位：
Aichi Institute of Technology (A.I.T)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650445/
关键词：
Shallow Foundation Stability Analysis Load Bearing Capacity Slope Stability Footing Three-Dimension Failure Surface

项目摘要

In order to study three-demensional properties of failure surface and of the ultimate bearing capacity (qu), when loaded on bases in finite length placed on level and slope foudations, and to propose a practically useful design method of stability analysis, laboratory loading tests were performed on sand and clay foundations by changing the ratio of base size (eta=B/L) and the position of the base on the foundation.In loading test on level ground, qu-value decreases as eta increases in sand foundations, showing shape factor (s=q_3/q_2=1+neta) of n=-0.2 - -0.5 that is in good agrreement with other test results as pbtained. In clay foundations on the other hand, qu-value increases as eta increases in the similar manner as analytical results, nevertheless n-value showed a considerably large defference.In loading tests on sand slope, qu-value increase as eta increases unlike in level grounds, but the trend of qu showed gradual change to level ground as the distance from the slope shoulder increases. In comparisons with computation, test results of qu were in good correspondence in the range eta<0.5, but showed considerably smaller value as eta approaches to unity (square foundation).In loading tests on sands, failure surfaces were obseved successfully by setting thin dark stripes between sand layrs, and they were to be approximated mathmatically in good accuracy with log-spiral curves.The three-dimensional slice method of analysis of bearing capacity which has already been proposed for level ground was extended to problems of sloping ground, of inclined anisotropic ground, and of eccentric and inclined loading conditions. Quite successful results were obtained by comparing the above test results and solutions so far presented.

In order to study three-demensional properties of failure surface and of the ultimate bearing capacity (qu), when loaded on bases in finite length placed on level and slope foudations, and to propose a practically useful design method of stability analysis, laboratory loading tests were performed on sand and clay foundations by changing the ratio of base size (eta=B/L) and the position of the base on the foundation.In loading test on level ground, qu-value随着沙子基础的ETA的增加而减小，显示了n = -0.2 -0.5的形状因子（s = q_3/q_2 = 1+neta），与其他测试结果相处得很好。另一方面，在粘土基础中，随着ETA与分析结果相似的方式增加，Qu值增加了，但是，N值显示出大量的脱毛。在砂坡上的加载测试中，Qu-value的加载测试，ETA的增加，ETA的增加与级别的基础不同，但是QU的趋势显示出逐渐变化，而逐渐变化，远距离距离距离距离距离的距离逐渐变化。与计算相比，Qu的测试结果在ETA <0.5范围内具有良好的对应关系，但随着ETA的统一方法（Square Foundation）（Square Foundation）（Square Foundation）的价值（平方基础）。在沙子上的负载测试中，通过在砂线之间设置薄薄的暗条来成功地观察到薄的黑暗条件，并且在砂层之间进行了近似的数学能力，可以很好地分析数学上的数学范围。提出了用于水平地面的提议，扩展到了倾斜地面，倾斜的各向异性地面以及偏心和倾斜的载荷条件的问题。通过比较到目前为止提出的上述测试结果和解决方案，获得了相当成功的结果。