含水量对泥石流物源流变特性影响试验研究

doi:10.13722/j.cnki.jrme.2015.0997

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摘要

水源对物源物理、力学特征作用是泥石流起动的内在作用，为研究该作用并阐述泥石流的起动机制，研制十字板改进的剪切流变仪作为主要仪器，以含水量作为水源条件的参数，以剪应力和应变关系作为物源条件研究对象，试验材料选用受含水量影响最显著的细颗粒土(d≤1 mm)开展间歇性人工降雨试验，使试验材料处于5级不同含水量水平，并分别开展加、卸载试验。试验表明，起动前试样在低含水量水平和试验加载条件下，其应变逐渐收敛于稳定值，该值随含水量增加而增大，当含水量达到一定水平(本试验为28.8%，称为起动水平)时，在试验加载条件下其应变不收敛，最终进入运动状态即起动；该结果表明泥石流起动具有流变变形特征，该特征可用本文提出的改进Bingham体模型表达，将试验数据代入模型方程可以确定模型参数。5级含水量条件下试验结果表明该模型参数是含水量的函数，随着含水量增加呈衰减趋势，表明含水量增加导致物源强度降低，最终导致作用于物源上原有力系平衡的失效，进而产生泥石流的起动。采用模型计算所得的卸载应变过程曲线与计算曲线具有较好一致性，表明该模型具有良好的适用性，可用于阐述泥石流的起动机制。

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	刘中港1
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	刘晓丽1
	王恩志1
	王芳1
	魏天清2
	高创2

关键词 ：工程地质, 泥石流, 剪切流变仪, 应变, 改进Bingham体模型

Abstract：

Soil material mechanical characteristics are affected by water，which is the intrinsic factor of debris flow initiation. In order to investigate the affect and demonstrate the debris flow initiation mechanism，an apparatus named Vane shear rheomete which was improved by the four-bladed vane and used to carry out the loading-unloading test on the fine granular soil(d≤1m m). In the test，the relationships between shear stress and strain have been checked as in 5 levels of water content. The test data reveal that the strain of soil material converge to a certain value under low water content and the test loading，and the value increases as the water content increasing. While the water content reaches a certain level (28.8% in the test，named initiation level)，the strain will diverge and eventually result in initiation. Those results mean that the debris flow initiation results from the rehology with the high water content. It is found that the rehology can be described by an improved Bingham model which was promoted. The model parameters were calculated by the test data and coherence between model and test data were checked，which shows the test and model can be used to demonstrate the debris flow initiation.

Key words： engineering geology debris flow Vane shear rheometer strain improved Bingham model

引用本文:

刘中港1，2，刘晓丽1，王恩志1，王芳1，魏天清2，高创2. 含水量对泥石流物源流变特性影响试验研究[J]. 岩石力学与工程学报, 2015, 34(S2): 3830-3836.
LIU Zhonggang1，2，LIU Xiaoli1，WANG Enzhi1，WANG Fang1，WEI Tianqing2，GAO Chuang2. STUDY OF RHEOLOGICAL CHARACTERISTICS AFFECTED BY WATER CONTENT WITH SHEAR TEST. , 2015, 34(S2): 3830-3836.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0997 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/3830

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