循环荷载作用下路基土体塑性变形研究

在分析岩土体在重复荷载作用下永久变形产生和发展的规律,以及对常用重复荷载作用下土体永久变形计算方法的基础上,采用单元强度随机生成的有限元方法对重复荷载下岩土体永久变形规律进行了数值仿真,得出以下主要结论:采用单元强度随机生成的有限元方法模拟方法能够较好的表现土体永久变形的基本规律,路基岩土材料的强度变异性是土体在重复荷载下累积变形表现与其他材料差别的主要因素;红层软岩路堤在不同大小的车辆荷载作用下塑性累积变形逐渐发展;当汽车荷载较小,路基在车辆荷载作用下的变形可以稳定。当荷载较大,则沉降渐进发展而且不能稳定,会出现路基土体移动,路基脱空等病害。

Research for plastic deformation of subgrade soil under cycle loading

The rules for production and development of rock and soil under repeated loading are analyzed in this essay.And then,based on traditional calculation methods analysis for permanent deformation of soil under repeated loading,the permanent deformation rules of rock and soil under repeated loading are numerically simulated by finite element method of element strength generated in random.The main conclusions are drawn as following.The finite element method of element strength generated in random can fairly simulate the basic rule of soil permanent deformation.And the strength variability of subgrade geotechnical materials is the main factor on performance difference of accumulated deformation under repeated loading between soil and other materials.The accumulated plastic deformation in different vehicles loading gradually develops for red-bed soft rock embankment.when the vehicle smaller loads,the roadbed of the vehicle loads deformation can be stabilized.When vehicle loading is smaller,the deformation of subgrade can be stable under vehicle loading.Moreover,when vehicle loading is larger,the settlement gradually develops and can not stable,which there will be diseases of subgrade soil movement,and cavity in subgrade so on.