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.

为了研究故障表面和最终轴承能力（QU）的三维特性，当以有限的长度放置在水平和坡度上时，并提出了实验室加载测试的实际有用的设计方法通过改变基本大小（ETA = B/L）的比率和基础上的位置在砂面上进行。 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的增加与分析结果相似的方式增加，Qu值增加了，但是，N值显示出相当大的脱毛。在沙坡上的加载测试中，Qu-value的加载测试，ETA的增加，而随着水平的增加，ETA的增加也会增加。地面，但是随着距离坡度距离的距离的增加，QU的趋势显示出逐渐变化为水平地面。与计算相比，在ETA <0.5范围内，QU的测试结果在良好的对应关系中，但由于ETA的统一方法（Square Foundation）（Square Foundation）在沙子上的负载测试中显示出较小的值，通过设置薄薄的深色，可以成功地观察到故障表面沙子层之间的条纹，并且应通过对数螺旋曲线在数学上近似地近似。各向异性的地面，以及偏心和倾斜的载荷条件。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。