黏性土坡上裙板式条形基础的极限承载力

由于斜坡的存在,坡上基础的极限承载力相比平地时有所下降,设置裙板可提高其承载力.目前关于坡上裙板基础承载力的研究尚不充分.以黏性土坡上裙板式条形基础为研究对象,采用数值模拟的方法研究其在不排水条件下的极限承载力.首先通过与承载力理论解的比较验证了数值计算的可靠性,然后通过大量算例分析了影响承载力的因素.结果表明:坡角对...

Ultimate bearing capacity computation of skirted strip footing on the cohesive soil slope

Due to the existence of slope,the ultimate bearing capacity of footing on slope is lower than that on flat ground,and the bearing capacity can be increased by adding skirts below footing.At present,the research on the bearing capacity of skirted footing on slope is still in deficiency.Under this background,this study focuses on the skirted strip footing located on cohesive slope,and the numerical simulation method is applied to determine the ultimate bearing capacity under undrained condition.Firstly,the results of numerical computation are compared with theoretical solution of bearing capacity to verify the reliability of numerical computation.And then the factors affecting the bearing capacity are analyzed through a large number of numerical models.The results indicate that the slope angle has a negative effect on the bearing capacity,and the footing bearing capacity can be increased effectively by setting skirt,and the bearing capacity increases with the relative height of skirt.When the slope angle is large,the relative distance between footing edge and slope crest has an appreciable effect on failure mode and bearing capacity of the footing.With the increase of the relative distance between footing edge and slope crest,the effect of slope on the movement tendency of soil is gradually reduced,so the bearing capacity of skirted footing increases gradually.Nevertheless,the influence of skirts on the bearing capacity is not significant when the undrained strength of soil is not high.According to the influence factors obtained from numerical computation and the previous relevant theoretical research,the equation of ultimate bearing capacity of skirted footing on cohesive slope without drainage is derived.In the equation,the reduction coefficient is introduced to consider the negative effect of slope,and the depth coefficient is introduced to define the positive effect of skirt.The accuracy of derivation is verified by comparing the equation calculation with the numerical computation.