周翠英, 苏定立, 刘镇. 2019: 软岩渗流-化学-损伤软化过程中能量耗散机制. 工程地质学报, 27(3): 477-486. DOI: 10.13544/j.cnki.jeg.2018-338
    引用本文: 周翠英, 苏定立, 刘镇. 2019: 软岩渗流-化学-损伤软化过程中能量耗散机制. 工程地质学报, 27(3): 477-486. DOI: 10.13544/j.cnki.jeg.2018-338
    ZHOU Cuiying, SU Dingli, LIU Zhen. 2019: DISCUSSION ON ENERGY DISSIPATION MECHANISM IN SEEPAGE-CHEMICAL DAMAGE-SOFTENING PROCESS OF SOFT ROCK. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 477-486. DOI: 10.13544/j.cnki.jeg.2018-338
    Citation: ZHOU Cuiying, SU Dingli, LIU Zhen. 2019: DISCUSSION ON ENERGY DISSIPATION MECHANISM IN SEEPAGE-CHEMICAL DAMAGE-SOFTENING PROCESS OF SOFT ROCK. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 477-486. DOI: 10.13544/j.cnki.jeg.2018-338

    软岩渗流-化学-损伤软化过程中能量耗散机制

    DISCUSSION ON ENERGY DISSIPATION MECHANISM IN SEEPAGE-CHEMICAL DAMAGE-SOFTENING PROCESS OF SOFT ROCK

    • 摘要: 红层软岩具有遇水软化特性,在降雨条件下渗流、化学、力学损伤等多效应综合作用造成工程地质灾害,是岩土工程界广泛关注的热点和难点问题之一。基于能量耗散原理,研究了软岩软化过程中的渗流、化学、损伤效应,提取了主要的渗流、化学、损伤能量变量,讨论了渗流-化学-损伤效应对软岩软化过程的作用以及能量耗散的机制,结合软岩三轴试验分析了能量耗散过程。结果表明:在渗流-化学-损伤效应共同作用下,水在软岩中形成渗流,渗流的作用加速了软化进程;软岩与渗流之间的化学作用加速了裂隙-孔隙损伤的发展;软岩裂隙-孔隙损伤的发展反过来促进了渗流及化学的作用。从能量角度来看,软岩软化后可承受的极限应变能量减少,渗流提供了能量同时也通过化学效应消耗了软岩自身的能量,降低了强度并引发损伤,因此,软岩软化的过程是一个能量耗散的过程。在此过程中,渗流、化学、力学损伤等能量的涨落及耗散、物质交换、非线性正反馈作用,使得软岩经历从平衡态到非平衡态相变,最终软化破坏形成了耗散结构。

       

      Abstract: Red bed soft rock has the characteristics of softening when it encounters water. The comprehensive effects of seepage, chemical and mechanical damage under rainfall conditions result in engineering geological hazards, which is one of the hot and difficult issues in geotechnical engineering field. Based on the principle of energy dissipation, the seepage, chemical and damage effects in the softening process of soft rock are studied. The main seepage, chemical and damage energy variables are extracted. The effect of seepage-chemical-damage on the softening process of soft rock and the mechanism of energy dissipation are discussed. The energy dissipation process is analyzed with triaxial test of soft rock. The results show that under the combined action of seepage-chemical-damage effect, water forms seepage in soft rock, which accelerates the softening process. The chemical interaction between soft rock and seepage accelerates the development of fracture-pore damage. The development of fracture-pore damage in soft rock in turn promotes the seepage and chemical action. From the energy point of view, the ultimate strain energy of soft rock can be reduced after softening. Seepage provides energy, but also consumes the energy of soft rock itself through chemical effect, which reduces strength and caused damage. Therefore, the softening process of soft rock is a process of energy dissipation. In this process, the fluctuation and dissipation of seepage, chemical and mechanical damage energy, material exchange and non-linear positive feedback make soft rock undergo phase transition from equilibrium to non-equilibrium, and finally soften and destroy intact soft rock to form dissipative structure.

       

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