基于最大Lyapunov指数分析的尾矿坝浸润线控制混沌方法

为了改善尾矿坝浸润线状况，提出了一种控制混沌方法。该方法对时间序列叠加一个周期振动，通过最大Lyapunov指数分析，来判别叠加前后系统混沌特性的变化，进而实现控制混沌。应用这种方法，分析了银山铅锌矿尾矿坝浸润线实测数据。结果表明，叠加周期振动可以降低最大Lyapunov指数。最大Lyapunov指数的降低程度与振动周期成负相关，与振幅成正相关。采用控制混沌方法，即对尾矿排放、库水位调节、排渗、不同尾矿库的使用等措施进行周期性控制，可以提高尾矿坝安全度，实现尾矿坝科学管理。中还以防洪高度为例，具体分析了尾矿坝工程中的控制混沌，表明该方法在应用上是可行的。

A NEW METHOD FOR CHAOS-CONTROLLING OF SEEPAGE LINE IN TAILINGS DAM BASED ON ANALYSIS OF LARGEST LYAPUNOV EXPONENT

The present paper intends to introduce the author's method of controlling chaos so as to improve the seepage line of tailings dam. The said method has been realized through analyzing the largest Lyapunov exponent for evaluating the change of chaotic features of the time series before and after stacking with a periodic vibration. The method helps to monitor the seepage line data of tailings dam in Yinshan lead-Zinc Mine, Jiangxi, indicating that the largest Lyapunov exponent can be reduced by stacking with a periodic vibration. The reducing degree, as a matter of fact, proves to be in inverse proportion to the periodicity of the vibration but in direct proportion to the amplitude. Furthermore, the safety degree of the tailings dam can be improved with the successful application of the above method in timely discharging tailings, adjusting reservoir level, draining, using different reservoirs and so on. As a case of chaos controlling with the method, a detailed analysis of flood prevention has been provided in the paper, whose result shows that the method introduced here is feasible.