适用于膨胀性非饱和土的边界面模型的数值实现

doi:10.13722/j.cnki.jrme.2017.0423

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摘要基于完全隐式的Euler向后积分算法，对一个适用于膨胀性非饱和土的边界面模型提出一种应力积分方法。模型中的塑性变形具有双重机制即加载–湿陷机制和微观结构机制，并考虑力学行为与持水滞回间的耦合作用。依据当前应力状态、力学与持水模型中各塑性机制的发生情况，将应力积分过程中的当前增量步分为多种情况，针对每一情况利用Euler向后算法进行试算，并依据判定准则选取结果。其次，利用该模型分别对已有的吸力循环试验和三轴压缩试验进行了验证，以此反映模型的预测能力和算法的运行能力。最后，对比不同步长的应变控制试验路径下的计算结果，以此验证应力积分方法的稳定性和精度。

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	李舰1
	赵成刚1
	刘艳1
	付海清2

关键词 ：土力学, 非饱和土, 膨胀土, 边界面模型, 双重塑性机制, 隐式积分算法

Abstract：An integration scheme based on the fully implicit Euler algorithm of backward integration has been proposed for a bounding surface model of unsaturated expansive clay. Two plastic deformation mechanisms in the modeling are defined，i.e. the loading-collapse mechanism and the microstructure mechanism. The coupling of stress-strain behavior to the hydraulic hysteresis is taken into account. Various situations are defined in a stress integral process according to the current stress state and the number of irreversible mechanisms active for mechanical modeling and hydraulic modeling. The trial solution is obtained by the Euler backward integration algorithm for each situation，and the true one is determined according to defined criterions. The performance of the model and the integration scheme were verified through the simulation of a series of published tests，including the cyclic suction tests and the triaxial tests. The stability and accuracy of the integration scheme are demonstrated through the comparisons of the calculated results of strain controlled tests for unsaturated expansive soils with different step sizes.

Key words： soil mechanics unsaturated soils expansive soils bounding surface modeling double plastic mechanism implicit integration algorithm

引用本文:

李舰1，赵成刚1，刘艳1，付海清2. 适用于膨胀性非饱和土的边界面模型的数值实现[J]. 岩石力学与工程学报, 2017, 36(10): 2551-2562.
LI Jian1，ZHAO Chenggang1，LIU Yan1，FU Haiqing2. Numerical implementation of a bounding surface model for unsaturated expansive clays. , 2017, 36(10): 2551-2562.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0423 或 http://www.rockmech.org/CN/Y2017/V36/I10/2551

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