饱和黏土静力及循环稳定弹塑性分析

doi:10.13722/j.cnki.jrme.2017.0483

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摘要

为了评价黏土地基在结构自重及海洋风、浪等荷载作用下的稳定性，在临界状态理论框架中，基于修正的运动硬化弹塑性模型，模拟静力及循环荷载作用下饱和黏土的力学响应。通过修正已有模型的硬化规律，使其能够更好地描述黏土静力和循环受力特性；建立类似于修正剑桥模型的边界面方程，以适应等向硬化及修正的运动硬化规律；采用径向映射法则及移动的映射中心模拟应力–应变曲线的滞回性；构建适当的塑性模量插值函数，描述饱和黏土在低应力水平下的循环稳定特性。通过对相关文献中及天津黏土循环三轴试验结果的模拟，验证模型的合理性和有效性，结果表明，修正的模型具有模拟黏土静力及循环稳定等特性的能力。

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	姚海慧1
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关键词 ：土力学, 静力荷载, 循环荷载, 运动硬化规律, 循环稳定, 黏土

Abstract：

In order to evaluate the stability of clay foundation under the structural weight，wind and wave loading， an kinematic hardening elastoplastic model is modified in the framework of critical state theory，and the mechanical behaviors of saturated clay are simulated under static and cyclic loading. In the present work，the hardening rule of the existing model is modified to characterize the undrained response of saturated clay under not only static but also cyclic loading. Similar to the yield surface equation of modified Cambridge model，a new bounding surface equation is established according to the isotropic and kinematic hardening rule. The radial mapping law and moving mapping center are adopted to simulate the hysteresis of stress-strain curves，and a plastic modulus interpolation function is suggested for predicting the cyclic shakedown behavior of saturated clay under low stress levels. The validity of the modified model is verified through both the undrained monotonic and cyclic triaxial test data，and the results show that the modified model can realistically simulate the static and cyclic shakedown behaviors of saturated clay.

Key words： soil mechanics static loading cyclic loading kinematic hardening rule cyclic shakedown clay

引用本文:

姚海慧1，2，王建华1，2. 饱和黏土静力及循环稳定弹塑性分析[J]. 岩石力学与工程学报, 2017, 36(S2): 4251-4258.
YAO Haihui1，2，WANG Jianhua1，2. Elastoplastic analysis for static and cyclic shakedown behaviors of saturated clay. , 2017, 36(S2): 4251-4258.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0483 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4251

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