基于geostudio的混合结构过水围堰渗流稳定研究

Study on Seepage Stability of Mixed Structure Water Cofferdam Based on Geostudio

传统过水围堰渗流稳定研究存在围堰渗流检测不准确、边坡沉降监测精度偏低问题。为此通过非线性渗流规律分析、渗流方程、初始条件和边界条件的相互融合,引入Geo-Seep/w软件针对研究对象开展渗流分析,基于分析结果利用软件的Slope/w模块构建围堰渗流模型。以巴基斯坦帕坦水电站过水围堰为例,针对不同工况下渗流浸润线、渗透坡降开展仿真模拟。根据围堰渗流浸润线位置相关计算与岩体内渗流压力的整体分布,在不同工况下,获得实验结果。实验结果证明,研究所获得的围堰渗流监测结果与实际情况更相近,符合实际应用要求。在实验结果分析的基础上,针对过水围堰渗透提出的建议为:规划压坡透水体可以起到提升堰体整体稳定性的显著作用,可根据延长渗透的路径,改变渗流的整体形态,在一定程度上可起到降低渗透坡降的作用。

Traditionally, the seepage stability research of overwater cofferdam has the problems of inaccurate detection and low monitoring precision of settlement. Through the mutual integration of nonlinear seepage law analysis, seepage flow equation, initial condition and boundary condition, this study introduced Geo-Seep/w software to carry out the seepage flow analysis. Based on the analysis results, Slope/w module was used to build the cofferdam seepage model. Taking the overflow cofferdam of Pantan hydropower station in Pakistan as an example, the simulation of seepage phreatic line and seepage slope under different working conditions was carried out. According to the position of seepage phreatic line and the overall distribution of seepage pressure in rock mass, the Simulation results were obtained under different working conditions. Simulation results show that the seepage monitoring result is more similar to the actual situation. Based on the analysis of Simulation results, this article puts forward the following suggestions for seepage flow of overflow cofferdam:the planning of slope permeable body can improve the overall stability of weir body. Extending the path of seepage can change the whole form of seepage flow and thus to reduce the seepage slope.