桩承式路堤中填土破坏模式研究  

Failure Modes in Fill of Pile-supported Embankments

作　　者：费康[1,2] 陈毅[1] 王军军[1] 

机构地区：[1]扬州大学岩土工程研究所,江苏扬州225009 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《重庆交通大学学报（自然科学版）》2011年第2期258-262,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(50908198);江苏省高校自然科学基金项目(09KJB580004);河海大学岩土力学与堤坝工程教育部实验室开放基金项目(GH200805)

摘　　要：为了研究桩承式路堤中填土的破坏模式,采用有限元方法对不同桩间距、填土高度和摩擦角进行了参数敏感性分析。根据计算得到的屈服区和增量等效塑性应变结果,分析了不同情况下填土的破坏机理。结果显示:对于填土高度与桩间距之比H/s≤1的低路堤,填土中的破坏面为通过桩边缘的竖直面;对于H/s≥1.2的高路堤的情况,最终填土中将发展出类似经典地基承载力理论中的由弹性楔体、径向剪切区和被动破坏区组成的区域,并且由于相邻桩的影响,填土中破坏面的具体形式会有所改变。To improve the understanding of the failure modes in the embankment fill,a parametrical study through finite element method was carried out.In the analysis,the pile spacing,the fill height and the friction angle of embankment fill were varied.Based on the yield zone and increment of equivalent plastic strain,failure mechanism in fill under different circumstances was analyzed;it was found that for low embankment with the ratio of fill height to the pile spacingH/s≤1,the failure surface was vertical or slightly inclined which started from the pile edge and went through the whole fill height.For H/s≥1.2,though the shape was upside down,the developed failure surface was like that assumed in the Terzaghi＇s bearing capacity theory,i.e.at the ultimate state there was triangular elastic zone,radial shear zone and passive zone in the embankment fill.Due to the interference effect of adjacent piles,the failure surface was different in different cases.

关 键 词：桩承式路堤 土拱效应 有限元 破坏模式 

分 类 号：U416.12[交通运输工程—道路与铁道工程]