软岩遇水软化的耗散结构形成机制

朱凤贤; 周翠英

软岩遇水软化的耗散结构形成机制

朱凤贤,
周翠英^,

中山大学工学院, 岩土工程与信息技术研究中心, 广东广州 510275

基金项目:

中国高技术研究发展计划 2007AA11Z112

国家自然科学基金项目 59809008

国家自然科学基金项目 40672194

高等学校博士学科点基金项目 20060558060

广东省自然科学基金重点项目 013188

广东省自然科学基金重点项目 06104932

详细信息

作者简介:
朱凤贤(1982-), 男, 博士生, 主要从事岩土工程与信息技术学习与研究工作

通讯作者:
周翠英, E-mail: ueit@mail.sysu.edu.cn

中图分类号: P641
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- 被引次数: 0
出版历程
- 收稿日期: 2008-12-01
- 刊出日期: 2009-05-25

Forming Mechanism of Dissipative Structure in the Softening Process of Saturated Soft Rocks

ZHU Feng-xian,
ZHOU Cui-ying^,

摘要

摘要: 针对华南“红层”软岩遇水软化的复杂系统演化问题, 从其软化过程中是否形成耗散结构的思路出发, 研究了软岩系统非线性软化特征.结果表明: 软岩与水相互作用系统是一个开放的复杂系统, 在内部非线性作用下逐渐演化至非平衡状态, 其软化过程中可以形成有序的耗散结构.在此基础上, 采用耗散结构理论系统分析了软岩软化过程中耗散结构的形成机制: 软岩软化的过程经历了近平衡态、远离平衡自组织态与远离平衡临界态3个阶段, 并最终通过非平衡相变形成了具有一定稳定性的耗散结构.最后基于软岩软化过程中结构分维值演化规律, 初步建立了软岩耗散结构形成的分岔演化模型, 并将模型应用于软岩饱水软化试验的临界分岔现象分析中.分析表明软岩耗散结构是在系统经历多次倍周期分岔, 通过不断地从稳定到失稳再到稳定的过程后形成的.其中3个月与6个月这两个时间点具有显著的临界特征, 这是深入研究软岩软化耗散动力学过程的切入点.
- 软岩 /
- 软化 /
- 耗散结构 /
- 非平衡相变 /
- 临界分岔 /
- 机制
Abstract: Aiming at the complex issue of system evolution in softening process of saturated red-bed soft rocks, the research on softening characteristics of soft rocks is carried out from the aspects of systemic openness, far-from equilibrium behavior and internal nonlinear mechanism to affirm the occurrence of dissipative structure in softening process.On this basis, dissipative structure theory is adopted to systematically analyze the formation mechanism of dissipative structure in softening process of saturated soft rocks.The result shows that softening process contains three stages: Near-equilibrium state, far-from-equilibrium self-organizing state and far-from-equilibrium critical state, and ultimately, the way of non-equilibrium phase transition leads to the generation of soft rock dissipative structure.Finally, based on the evolution law of structure fractal dimension, a bifurcation evolution model is preliminarily established to describe the formation process of soft rock dissipative structure.The result of applying this model to analyze the critical bifurcation phenomena occurring in softening tests of saturated soft rocks indicates that this soft rock dissipative structure is formed after experiencing the process of period-doubling bifurcation and destabilization for many times, and the times of three months and six months present obvious critical characteristics which are two breakthrough points for further study on dissipative dynamic softening process of soft rocks in future.
- soft rocks /
- softening /
- dissipative structure /
- non-equilibrium phase transition /
- critical bifurcation /
- mechanism

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图 1 软岩在不同饱水时间作用后孔隙分维变化规律

Fig. 1. Variation of pore fractal dimension with saturation times

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图 2 软岩物理、力学性质与水溶液浓度的变化规律

Fig. 2. Variation regularity chart of physical and mechanical properties of soft rocks and concentration of aqueous solution

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图 3 非平衡相变过程示意图

Fig. 3. Sketch map of non-equilibrium phase transition

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图 4 Logistic离散动力演化系统的迭代过程(谢应齐和曹杰，1995)

Fig. 4. Iterative process of Logistic discrete dynamic system

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图 5 Logistic系统演化的分岔行为(谢应齐和曹杰，1995)

Fig. 5. Bifurcation behavior of Logistic system evolution

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图 6 软岩饱水过程中系统分岔演化规律

Fig. 6. Evolution regularity of soft rocks-water system during saturation process

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表 1 不同饱水时间下软岩相关参数

Table 1. Parameter table of soft rocks in different saturation times

表 2 Logistic方程指标计算结果

Table 2. Calculation results of Logistic equation index

表 3 动力学参数随时间的内插值

Table 3. Interpolation data of dynamic parameters with time

表 4 饱水3个月与6个月时间点临界特征

Table 4. Critical characteristics after 3 and 6 months saturation

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