石人水库边坡开挖卸荷有限元模拟分析

Finite Element Simulation Analysis of Slope Excavation Unloading in Shiren Reservoir

水利水电工程建设是我国新能源战略的重要组成,在水利工程建设中经常会遇到岩体开挖后边坡失稳现象。岩体开挖是一种物理卸荷作用,研究卸荷理论和其数值计算方法对水利工程设计意义重大。基于国内外研究进展,首先利用Mohr-Coulomb强度准则对岩体卸荷强度参数进行分析。随后利用ANSYS软件建立了边坡开挖有限元模型,并计算了边坡开挖卸荷过程中的应力分布和塑性区分布。最后对边坡位移和描杆轴力进行分析,对比了考虑卸荷效应和未考虑卸荷效应的区别。

Water conservancy and hydropower project construction is the important part in the new energy strategy in our country,in the water conservancy project construction often rock mass after excavation slope in- stability phenomenon.Which is a physical unloading rock mass excavation,the unloading theory and its numer- ical calculation method is of great significance to water conservancy engineering design.Based on the research progress both at home and abroad,the first use of Mohr-Coulomb strength criterion of unloading rock mass strength parameters are analyzed.Then slope excavation is established by use of ANSYS software, finite element model, and calculated the stress distribution in the process of slope excavation unloading and distribution of plastic zone.Finally ,the slope displacement and tracing axial force is analyzed ,compared with the considera- tion of unloading effect and without considering the effect of unloading distinction.