摘要
结合某膨胀土路堑边坡集群发生的病害现状,阐述坡面膨胀土性质的变化分布特征和营力作用下的风化程度变化分布特征的耦合效应是病害的内因;提出了新开挖膨胀岩土路堑边坡失稳机制的时程演化概念模型,揭示了开挖坡址部高应力剪切塑性区与相对更强风化效应形成的牵引式塌陷破坏是结构性滑动失稳的主要形式。结合膨胀岩土边坡稳定可控的变形可以有效补偿边坡失稳(膨胀或超固结)荷载水平的机理,优化了护坡支撑结构刚度设计方法,提出了压脚稳定结合综合坡面护坡体系的既有高速公路膨胀土路堑边坡失稳病害处置措施,工程实践证明处治效果良好。
In combination with the current situation of the disease in a cluster of expansive soil cutting slope,this paper expounds that the coupling effect of the variation distribution characteristics of the expansive soil properties and the variation distribution characteristics of the weathering degree under the action of the agentis the internal cause of the disease.A time-history evolution conceptual model for the instability mechanism of the newly excavated expansive rock-soil cutting slope is proposed,and it is revealed that the main form of structural sliding instability is the traction collapse failure formed by the high-stress shear plastic zone and relatively stronger weathering effect in the excavation slope site.Combined with the mechanism that controllable deformation of expansive rock and soil slope stability can effectively compensate the load level of slope instability(expansion or over consolidation),the design method for the stiffness of the slope supporting structure is optimized,and the treatment measures for the existing highway expansive soil cutting slope disease base on presser foot stability combined with comprehensive slope protection system are proposed.The engineering practice proves that the treatment effect is good.
作者
陈洪平
丁雪琪
杨子豪
石名磊
CHEN Hongping;DING Xueqi;YANG Zihao;SHI Minglei(Traffic Construction Engineering Management Center of Luzhou City Sichuan Province,Sichuan Luzhou 646000,China;School of Transportation Southeast University,Nanjing 211189,China)
出处
《低温建筑技术》
2019年第3期91-95,共5页
Low Temperature Architecture Technology
基金
2018年南京市交通科技项目
关键词
膨胀土路堑边坡
边坡失稳
边坡失稳病害处置
expansive soil cutting slope
slop instability
slope instability treatment of diseases
