%0 Journal Article
%A HUANG Chao-xuan
%A YUAN Wen-xi
%A FANG Yong-lai
%T Critical Embedded Depth of Foundation's Weak Substrata When <em>K</em><sub>0</sub>&ne;1
%D 2013
%R 10.3969/j.issn.1001-5485.2013.01.011
%J Journal of Yangtze River Scientific Research Institute
%P 56-60
%V 30
%N 1
%X Mathematical inferential reasoning was employed to obtain the critical load P<sub>1/4</sub> of strip foundation when&nbsp; the effect of <em>K</em><sub>0</sub>&ne;1 was considered, and the obtained formula was compared with formula 5.2.5 in&nbsp;<em>Code for Design of Building Foundation</em>&nbsp;&nbsp;(GB50007&mdash;2011). It's believed that the formula in the Code overestimates the foundation's bearing capacity while the formula in this study is more reasonable. When weak substrata exists in the foundation's load carrying layers, a check formula for the bearing capacity of the weak&nbsp; substrata is given in &quot;5.2.7&quot; in the Code, but the Code doesn't explain under what embedded depth of weak strata&nbsp; the effect of <em>K</em><sub>0</sub>&ne;1 can be ignored. On the basis of the obtained formula of foundation's bearing capacity, the relationship between the relative critical embedded depth (<em>H</em><sub>cr</sub>/<em>b</em>) of weak&nbsp; strata and the relative embedded depth of foundation (<em>d/b</em>) was obtained through dimensionless calculation. Finally through calculation examples, curves of relative critical embedded depth (<em>H</em><sub>cr</sub>/<em>b</em>) with different foundation widths and different shear strengths of weak layer were acquired. It's concluded that when the shear strength of weak strata and the internal friction angle of topsoil are larger, the relative critical embedded depth of weak&nbsp; substrata <em>H</em><sub>cr</sub> is smaller, hence the adverse impact would be smaller.&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;
%U http://ckyyb.crsri.cn/EN/10.3969/j.issn.1001-5485.2013.01.011