CAJ | 학술논문

为克服边界面模型应用不便、不能反映卸载过程中土体的弹塑性性质的缺陷，提出了一个循环荷载作用下可考虑弹塑性加、卸载过程的重塑黏土改进边界面模型。模型采用了简单的边界面形式，可大大简化该模型理论的推导与计算；采取了不预先定义边界面大小的方式，有效地降低了改进边界面模型在应用过程中的经验性；加入边界面胀缩规则，使模型可考虑土样卸载过程中的弹塑性性质，进而可反映土样的滞回特性。通过对重塑黏土进行循环三轴数值模拟试验，并与真实试验结果进行对比分析，验证了改进边界面模型的合理性和有效性。数值验证结果表明，改进边界面模型具有物理意义明确、参数易于确定、形式相对简单的特点，且该模型计算精度较高，计算结果与试验结果吻合得较好。
위극복변계면모형응용불편、불능반영사재과정중토체적탄소성성질적결함，제출료일개순배하재작용하가고필탄소성가、사재과정적중소점토개진변계면모형。모형채용료간단적변계면형식，가대대간화해모형이론적추도여계산；채취료불예선정의변계면대소적방식，유효지강저료개진변계면모형재응용과정중적경험성；가입변계면창축규칙，사모형가고필토양사재과정중적탄소성성질，진이가반영토양적체회특성。통과대중소점토진행순배삼축수치모의시험，병여진실시험결과진행대비분석，험증료개진변계면모형적합이성화유효성。수치험증결과표명，개진변계면모형구유물리의의명학、삼수역우학정、형식상대간단적특점，차해모형계산정도교고，계산결과여시험결과문합득교호。
This paper proposes an improved bounding surface model for remolded clay, which overcomes the defects that it is inconvenience to apply and not related with elastoplastic property in the unloading process of the bounding surface model, by considering elastoplastic loading and unloading processes under cyclic loading. The model uses a simple bounding surface formula, which significantly simplifies the derivation and calculation of the model; which also effectively reduces the empirical dependence in the application process of the improved bounding surface without predefining the bounding surface. It introduces bounding surface expansion and contraction rules, which makes the model consider the elastoplastic property of the soil in the unloading process and then reflects the hysteretic behavior of the soil. This improved bounding surface model is verified by comparison between numerical simulation of remolded clay cyclic triaxial test and the cyclic triaxial lab test. The results show that the improved bounding surface has following advantages: clear physical significance and simple form, parameters easy to determine, high precision of calculation and the calculation results fitting the real test results.