考虑中间主应力的路堤临界填土高度统一解及比较

doi:10.13722/j.cnki.jrme.2015.1116

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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.

Key words： soil mechanics embankment filling height intermediate principal stress lateral pressure coefficient effect of strength theory

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	ZHANG Changguang
	YAN Qing
	ZHANG Chenglin

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ZHANG Changguang,YAN Qing,ZHANG Chenglin. A unified solution of critical filling height for embankment considering#br# intermediate principal stress and its comparisons[J]. , 2016, 35(7): 1466-1473.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1116 OR http://www.rockmech.org/EN/Y2016/V35/I7/1466

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