西汉高速公路膨胀土堑坡浅层稳定性研究  

Research on Shallow Layer Stability of Cutting Slope with Expansive Soil in Xi-Han Highway

作　　者：来弘鹏[1] 谢永利[1] 杨晓华[1] 

机构地区：[1]长安大学公路学院,西安710064

出　　处：《武汉理工大学学报》2010年第1期29-33,共5页Journal of Wuhan University of Technology

基　　金：陕西省建设科技项目(2004021)

摘　　要：针对西汉高速公路膨胀土地区路堑边坡浅层破坏的工程特性,提出了浆砌片石骨架+土工格室的稳定技术,详细分析了其稳定机理,给出了其设计参数和施工工艺。并对其稳定效果进行了数值分析,结果表明:浆砌片石骨架+土工格室种植土的稳定措施对坡面的应力分布的改善,表现为坡面剪应力的减小且分布更趋均匀,以及在坡脚部位剪应力集中程度的减弱;采用该稳定措施后,坡脚部位剪切方向总应变值、塑性应变区及极限塑性应变值均明显减小。最后,通过工程实例表明:浆砌片石骨架+土工格室种植土的技术不仅稳定效果要优于浆砌片石护坡的圬工工程方案,且可节约经费约8%,在保护生态环境、改善公路景观功能与旅行环境方面具有不可估量的社会综合效益。According to the engineering characteristics of shallow layer breakage on expansive soil cutting slope in Xi-Han Highway,this paper puts forward a reinforcement technology which adds geocell in pulp-built stone tablets.Based on the analysis of its stability mechanisms,we provide its design parameter and techniques detail.The result of numerical analysis on this technology＇s stabilization indicates that adding geocell in pulp-built stone tablets improves stress distribution on slope,which makes the shear stress on slope face lower,and its distribution symmetrical,as well as the centralization of shear stress on slope heel becomes weaker.After adoption of this technology,on the slope heel,the gross of strain on shear direction;plastic strain zone and ultimate plastic strain are all obviously down.At last,by the engineering example,we find out that pulp-built stone tablets adding geocell not only has a better reinforcement effect than pulp-built stone tablets protection,but also can save the outlay about 8%,and in the aspects of ecological environment protection,highway landscape function and traveling environment improvement,this technology has immeasurable social comprehensive benefit.

关 键 词：道路工程 膨胀土 路堑边坡 浅层稳定技术 

分 类 号：TU443[建筑科学—岩土工程]