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饱和软土地基上交通动载会引起显著的沉降,在考虑循环荷载作用的经验显式本构模型的基础上发展了等效有限元方法,实现了对交通移动荷载下路基长期沉降的计算。采用拟静力方法计算动应力比,基于试验量测的累积轴向应变及累计孔压建立显式的应力–应变模型,得到交通循环动载下地基单元的塑性应变,结合初应变有限元的原理,对通用有限元软件进行二次开发实现路基运营沉降计算。作为算例分析了一个典型的路基断面在交通荷载作用下塑性应变和长期沉降的发展分布规律。分析表明,最大塑性应变发生在路面侧边界位置,而最大沉降分布于路面中心一定宽度范围内。
Based on the empirical explicit constitutive model considering the cyclic loading, an equivalent finite element method is developed and the calculation of long-term subgrade settlement under traffic moving loads is realized. The dynamic stress ratio was calculated by quasi-static method. Based on the experimental axial cumulative strain and cumulative pore pressure, an explicit stress-strain model was established to obtain the plastic strain of foundation elements under the cyclic loading. Combined with the initial strain finite element method Principle, the common finite element software for secondary development of subsidence calculation of subgrade operation. As an example, the development and distribution of plastic strain and long-term settlement of a typical subgrade section under traffic load are analyzed. The analysis shows that the maximum plastic strain occurs at the pavement side boundary and the maximum settlement is distributed within a certain width of the pavement center.