库区边坡堆积体变形及稳定研究

Study on the deformation and stability of reservoir slope accumulation body

以下汤章库首右岸边坡堆积体为例,采用三维弹黏塑性有限单元法研究边坡变形和抗滑稳定问题。结果表明:该边坡堆积体满足抗滑稳定要求,但变形偏大;变形的内因是堆积体变性模量较小,外因是库水位变化以及暴雨等外部环境改变;边坡堆积体不同方向的周期性大变形造成其上民房开裂。因此,需加强水库运行管理,控制库水位上升或下降的速度,尽可能避免或减小外部环境发生剧烈变化;进一步的抗滑稳定加固措施必要性不大。

This article takes the Xiatangzhang slope on the first right bank of a reservoir as an example to study the slope deformation and anti-sliding stability by using three-dimensional elastic-viscoplastic finite element method.The results show that the slope meets the requirements against slide failure,but the deformation is too large.The internal factor of the large deformation is the small elastic modulus of the slope accumulation body,and the external factor is the change of external environment inclusive the reservoir water level and the rainstorm,etc.Periodic and multi-directional large deformation of the slope body will result in the damages(e.g.cracking)of founded buildings.Therefore,it is necessary to improve the operation management of the reservoir,control the rising or falling speed of the reservoir water level,and avoid or reduce violent changes in the external environment as much as possible,etc.But further stabilization countermeasures are not necessary.