堤坝渗流管涌耗散结构形成机制

The Formation Mechanism of the Dissipative Structuresin the Seepage Piping Process of Embankment and Dam

通过对堤坝系统结构特征的分析,表明堤坝系统是一个由许多子系统组成的、复杂的开放系统,系统内部的相互作用是非线性的,在渗流作用下由近平衡态逐渐演化至远离平衡态,当外界条件的变化达到一定阀值时,可以形成有序的耗散结构。采用耗散结构理论系统分析了渗流管涌演化过程中耗散结构的形成机制。研究结果表明,堤坝渗流管涌演化过程经历了近平衡态、临界非平衡相变和远离平衡态3个阶段,并最终形成有序的耗散结构。最后通过对渗流过程中系统能量变化的分析,建立了系统的熵变模型,提出了渗流管涌稳定的临界条件。

By analysis the structural features of the embankment and dam system ,it shows that em-bankment and dam is a complex open system maded up of many subsystems , interactions within the system is non-linear ,it gradually becomes far away from the equilibrium state under the influence of seepage effect , when the external conditions changeand and reached a certain threshold , it can be formed ordered dissipative structures.The formation mechanism of the dissipative structures in the em-bankment and dam system is discussed by the dissipative structure theory.The results of the research indicate that the embankment and dam system is a complex open system.In the formative processes of the dissipative structure , the system goes through three stages -near equilibrium , critical transi-tions of non-equilibrium and far from the equilibrium -before it eventually develop an ordered dissi-pative structure.Lastly, a entropy model is established ,by analyzing the system entropy changes ,and the critical conditions of the stability of the piping seepage are put forth.