摘要
为了准确描述地铁隧道塌方的演化过程,首先分析了地铁隧道塌方演化的一般规律,从理论分析角度探寻能描述塌方演化过程的方法,针对传统的热力学耗散结构理论的缺陷,对其进行改进,表现在:1)熵是一个状态函数,不能直接输入或输出,只能依附于一定的能量之上,即以塌方"负熵变能"取代"负熵"描述塌方耗散结构的形成过程;2)负熵变能包括直接负熵变能和间接负熵变能,传统理论没有考虑间接负熵变能,引入广义负熵的概念,并以此推导塌方能量损伤演化方程。把改进的耗散结构理论引入到地铁隧道施工塌方孕险机理研究中,建立了塌方负熵变能(有序化能量)和广义负熵变能(广义有序化能量)损伤演化方程,并运用负熵变能对塌方耗散结构进行了分析。
Since the subway tunnel construction has obvious non-lin- ear characteristics, the collapse evolution process becomes very com- plicated. At present, most researchers mainly used the method of nu- merical simulation analysis to study the evolution process of collapse and certain achievements were accomplished. Because of many un- certain factors existing in the process of the tunnel construction, as- sumptions and simplification of the simulation are often required, which reduces the credibility of numerical simulation results. In order to accurately describe the collapse evolution process, this paper firstly analyzes the evolution of the general rule of subway tunnel collapse, and attempts to explore the method which can describe the collapse evolution process based on the perspective of theoretical analysis. The defects about the traditional dissipative structure theory of thermody- namic are improved in this paper, which can be described as follows： （1） The entropy is a state function which can not be input or output directly and only depend on a certain energy, i.e. collapse ＂negative entropy energy＂ is used to describe the formation process of collapse dissipative structure instead of ＂ negative entropy＂ ; （2） Negative en- tropy energy includes both direct and indirect negative entropy ener- gy, but the traditional thermodynamic theory does not take into ac- count the indirect negative entropy energy. This paper introduces the generalized concept of negative entropy energy, and deduces energy damage evolution equation of collapse. The improved dissipation structure theory is introduced to the research on collapse pregnancy risk mechanism of the subway tunnel construction. This paper estab- lished the damage evolution equation of negative entropy energy （ordering energy） and generalized negative entropy energy （generalized ordering energy）, used negative entropy energy to analyze the collapse dissipative structure. The research provided a new way for the analysis of collapse evolutio
出处
《安全与环境学报》
CAS
CSCD
北大核心
2012年第6期170-173,共4页
Journal of Safety and Environment
关键词
安全工程
耗散结构理论
塌方演化过程
负熵变能
正熵变能
safety engineering
dissipation structure theory
collapse evolution process
negative entropy energy
positive entropy energy
