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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 study the effect of concrete replacement and reinforcement of rock slope and the deformation and stress distribution of concrete in replacement cavern, a numerical calculation model of slope and replacement hole was established by finite element software ANSYS. According to finite element strength reduction method, And its corresponding yield criterion to simulate the constitutive relationship of concrete in replacement tunnel. The construction process of replacement hole excavation and concrete backfill was simulated by using the related functions of ANSYS software, and the stability safety factor before and after reinforcement of the slope was calculated. The deformation and stress distribution of the concrete in the replacement cavity and the location and direction of the concrete cracked and crushed under the critical steady state are compared. The calculation results of the Solid65 element and the DP yield criterion are also compared. The results show that there is a clear trend of large deformation of the slope in the critical steady state. The failure mode of the replacement hole in the near steady state is mainly the tensile failure and the crushing failure in the local area. Compared with the DP yield criterion, Better reflect the actual destruction of concrete state.