岩质边坡混凝土置换洞变形特点及加固效果分析  

Analysis of Reinforcement Effect and Deformation Features of Concrete Replacement for Rock Slope

作　　者：戴妙林[1] 鞠智敏[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2012年第7期123-126,共4页Water Resources and Power

基　　金：国家自然科学基金资助项目(51079044)

摘　　要：为研究岩质边坡的混凝土置换加固效果、置换洞混凝土的变形及应力分布规律,采用有限元软件ANSYS建立了边坡及置换洞数值计算模型,根据有限元强度折减法,利用软件的Solid65单元及其相应的屈服准则,模拟置换洞混凝土的本构关系,并采用ANSYS软件相关功能对置换洞开挖及混凝土回填的施工过程进行模拟,计算得边坡加固前后的稳定安全系数,分析了边坡在临界稳定状态下置换洞混凝土的变形和应力分布规律及混凝土拉裂和压碎破坏的部位和方向,并将Solid65单元与D-P屈服准则的计算结果进行了比较。结果表明,在临界稳定状态时边坡出现了明显的大变形趋势,置换洞在临近稳定状态下的破坏形式主要为拉裂破坏,局部区域为压碎破坏,与D-P屈服准则相比,Solid65单元更能反映混凝土的实际破坏状态。In order to research the reinforcement effect of the concrete replacement and the distribution of the deform- ation and the stress of the concrete, a rock slope with a concrete replacement hole is modeled by using FEM software AN- SYS. With FEM strength reduction method, the element type of Solid65 and its corresponding yield criterion are used to consider the constitutive relation of the concrete. The construction procedure of the hole excavation and the concrete back- fill is also simulated. The safety factors of the slope before and after reinforcement are obtained. Under the limit stability situation, the distribution regularities of the deformation and the stress, and the yield state of the concrete which includes the location and the direction of the concrete damage are analyzed. Furthermore, the calculation results with Solid65 are compared with that calculated by D-P yield criterion. The results show that the slope appears obviously large deformation trend under the critical stable state; the main damage deformation of replacement hole is drawing breakage while it is crushing damage in local area; comparison of D-P yield criterion, Solid65 element can better reflect the actual damage state of concrete.

关 键 词：混凝土置换 ANSYS SOLID65单元 强度折减法 岩质边坡 

分 类 号：TU457[建筑科学—岩土工程]