干湿循环作用下压实黄土强度劣化模型试验研究

doi:10.13722/j.cnki.jrme.2018.0770

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摘要为了解干湿循环引起的压实黄土强度劣化规律，开展考虑干密度、干湿循环幅度、干湿循环下限含水量三种影响因素的干湿循环三轴试验，得到不同因素影响下的压实黄土强度劣化曲线。采用双曲线函数对劣化度进行拟合，定量分析干密度、干湿循环幅度、干湿循环下限含水量对压实黄土强度劣化规律的影响，建立综合考虑三种影响因素的“压实黄土干湿循环强度劣化模型(CLDM)”，并通过SEM图像分析从微观结构角度对强度劣化进行解释。最终通过基于Python语言的二次开发将CLDM模型应用至有限元软件ABAQUS，实现了干湿循环作用下压实黄土填方边坡稳定分析，验证了CLDM模型在数值模拟中的适用性。研究结论可为压实黄土干湿循环强度劣化的分析以及填方边坡灾害预测提供参考。

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	胡长明1
	袁一力1
	王雪艳1
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	梅源1
	刘政1

关键词 ：土力学, 干湿循环, 压实黄土, 强度劣化, 拟合分析, 二次开发

Abstract：In order to fully understand the strength deterioration law of compacted loess caused by wetting-drying cycles，a series of triaxial tests considering the influence of the dry density，the wetting-drying amplitude and the lower bound water content of drying-wetting cycles were carried out，and the strength deterioration curves of compacted loess under different influencing factors were obtained. The effects of the dry density，the wetting-drying amplitude and the lower bound water content on the strength deterioration law were quantitatively analyzed by fitting a hyperbolic function to the deterioration data and as a result，a compacted loess deterioration model(CLDM) was established. Besides，SEM tests were carried out to study the microstructure change caused by wetting-drying cycles. A Python-based secondary development of finite element software was carried out in order to apply CLDM to ABAUQS，by which the stability of a loess fill slope after exposure to drying-wetting cycles was analyzed，and the applicability of the CLDM model was validated. Research results provide a theoretical basis for the analysis of the strength deterioration of compacted loess caused by wetting-drying cycles and for the prediction of fill slope disasters.

Key words： soil mechanics wetting-drying cycles compacted loess strength deterioration fitting analysis secondary develop

引用本文:

胡长明1，袁一力1，王雪艳1，2，梅源1，刘政1. 干湿循环作用下压实黄土强度劣化模型试验研究[J]. 岩石力学与工程学报, 2018, 37(12): 2804-2818.
HU Changming1，YUAN Yili1，WANG Xueyan1，2，MEI Yuan1，LIU Zheng1. Experimental study on strength deterioration model of compacted loess#br# under wetting-drying cycles. , 2018, 37(12): 2804-2818.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0770 或 http://www.rockmech.org/CN/Y2018/V37/I12/2804

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