固化土路面基层材料的双模量特性及数值分析

Bimodal Characteristics and Numerical Analysis of Solidified Soil Pavement Base Materials

摘要: 为探究固化土路面基层材料在复杂应力状态下的力学响应，开展了室内小梁三点弯曲试验，并基于双模量理论建立了有限元数值计算模型。研究对比了传统单模量模型与考虑拉压异性的双模量模型在弯拉工况下的计算差异。结果表明：固化土材料具有显著的拉压模量差异特性；传统单模量模型计算的跨中挠度与实测值偏差较大，无法真实反映结构的变形行为；引入双模量本构关系后，有限元模拟结果与试验曲线吻合度显著提高。研究成果揭示了忽略拉压模量差异是导致传统设计偏不安全的重要原因，可为固化土路面基层的抗裂设计与寿命预估提供更精确的理论依据。

Abstract: To investigate the mechanical response of solidified soil pavement base materials under complex stress states, indoor three-point bending tests on small beams were conducted, and a finite element numerical calculation model was established based on the dual-modulus theory. The study compared the calculation differences between the traditional single-modulus model and the dual-modulus model considering tension-compression anisotropy under bending-tension conditions. The results show that solidified soil materials exhibit significant differences in tension and compression moduli; the mid-span deflection calculated by the traditional single-modulus model deviates significantly from the measured value, failing to accurately reflect the deformation behavior of the structure. After introducing the dual-modulus constitutive relation, the finite element simulation results showed a significant improvement in agreement with the experimental curves. The research findings reveal that neglecting the difference in tension and compression moduli is a significant reason for the unsafety of traditional designs, and can provide a more accurate theoretical basis for the crack-resistant design and life prediction of solidified soil pavement base materials.