Abstract:The critical filling height is an important index for the settlement and stability control of embankment on soft soils. A unified formula under the plane strain condition was firstly deduced for three true triaxial strength criteria,i.e.,the generalized M-N criterion,the generalized L-D criterion and the unified strength theory. Then,the unified solutions for both the critical load of foundation and the critical filling height of embankment were presented by considering the intermediate principal stress and the actual lateral pressure coefficient. The unified solutions were validated and their applicable conditions were also provided. Finally,the effect of strength theory was investigated and parametric studies about the influence of cohesion and inner friction angle on the critical filling height of embankment were discussed. It is found that the proposed unified solutions have good comparability. The effect of strength theory(i.e.,the intermediate principal stress effect) on the critical filling height of embankment is remarkable and the result of M-C criterion is too conservative. Moreover,the generalized M-N criterion,the generalized L-D criterion and the unified strength theory with parameter b =1/2 are recommended to be adopted. The influence of lateral pressure coefficient,cohesion and inner friction angle on the critical filling height is significant. A real lateral pressure coefficient should be determined in situ,and the variability of strength parameters of ground soils should be fully considered.
张常光,曾开华,赵均海. 非饱和土临界荷载和太沙基极限承载力解析解[J]. 同济大学学报:自然科学版,2010,38(12):1 736-1 740. (ZHANG Changguang,ZENG Kaihua,ZHAO Junhai. Analytical solutions of critical load and Terzaghi's ultimate bearing capacity for unsaturated soil[J]. Journal of Tongji University:Natural Science,2010,38(12):1 736-1 740.(in Chinese))
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