Continuous Solid-Fluidization Transition Mechanism of Loess Mudflow: Insights From Laboratory Experiments and Implications for Geophysical Processes

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Daozheng Wang, Xingang Wang, Xiaoqing Chen, Qiangbing Huang, Jiading Wang, Baoqin Lian, Fei Wang
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Abstract

Solid-fluidization transition-induced flow-like events pose significant threats to both ecological systems and human society. This geophysical phenomenon undergoes a continuous and catastrophic solid-fluidization-solid retransition, which often leads to severe disasters. A series of flume and rheological tests were conducted to explore the continuous solid-fluidization-solid retransition mechanism of sedimentary loess. The results showed that the flow distance after phase retransition increased by 39.5% compared with the first flowslip distance. With increasing rainfall intensity, the moisture content during phase transition tended to decrease while the time required for reactivation lengthened. Rheological analyses revealed that the reduction and recovery of storage modulus exhibited by thixotropy is a crucial mechanism in the phase retransition of soil, and they have significant time-concentration dependence. A higher soil water content leads to a longer structural recovery time and stronger thixotropy, which agrees well with the results of flume tests. Our experimental data NSav and NBag showed a positive power-law relationship and had similar fitting coefficients to the field case data, indicating that our experimental results have successfully captured the kinematic and rheological characteristics of real mudflow events. This study suggests that thixotropy can be used to interpret complex phase retransition processes in mudflow and can also help to explain the hypermobility and reactivation of many large geophysical processes, such as pyroclastic flows.

黄土泥流的连续固体流化转变机制:来自实验室实验的见解及其对地球物理过程的影响
固体流化过渡引起的类流事件对生态系统和人类社会都构成了重大威胁。这种地球物理现象经历了连续的、灾难性的固体流化-固体再转变,往往会导致严重的灾害。通过一系列水槽试验和流变学试验,探讨了沉积黄土的连续固-流化-固再转变机理。结果表明:与第一次流滑距离相比,相变后的流动距离增加了39.5%;随着降雨强度的增加,相变含水率有降低的趋势,而再活化所需的时间延长。流变学分析表明,触变性所表现出的储存模量的降低和恢复是土壤相变的重要机制,且具有显著的时间浓度依赖性。土壤含水量越高,结构恢复时间越长,触变性越强,这与水槽试验结果吻合较好。我们的实验数据NSav和NBag呈现出正幂律关系,并且与现场案例数据具有相似的拟合系数,表明我们的实验结果成功地捕获了真实泥石流事件的运动学和流变特性。这项研究表明,触变性可以用来解释泥流中复杂的相再转变过程,也可以帮助解释许多大型地球物理过程的超流动性和再激活,如火山碎屑流。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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