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针对半刚性基层材料施工硬化阶段因湿度变化引起的开裂问题,采用弹性地基梁力学模型,讨论了干缩应变、地基反应模量、地基水平摩擦阻力系数等因素对湿度干缩应力、湿度翘曲应力的影响.分析结果表明,湿度干缩应力系数随水平摩擦阻力的增大呈S型曲线增加,最终收敛于1;而湿度翘曲应力系数是相对刚度半径(即梁长与刚度半径比值)的函数,随着相对梁长的增大略超过1后趋近于1.最后,计算了常用水泥掺量下水泥稳定碎石在施工硬化阶段的湿度应力,依据开裂判据,硬化阶段水泥稳定碎石基层很容易产生早期开裂.
Aiming at the cracking problem of semi-rigid base material caused by humidity during the hardening stage, the mechanical model of elastic foundation beam is used to discuss the influence of factors such as shrinkage shrinkage, reaction modulus of foundation and horizontal frictional resistance coefficient on moisture shrinkage stress, The results show that the coefficient of moisture shrinkage stress increases with the increase of horizontal friction resistance, and finally converges to 1, while the coefficient of humidity warpage stress is the relative stiffness radius (ie, the ratio of beam length to stiffness radius) With the relative beam length increasing slightly more than 1 and then approaching 1. Finally, the moisture stress of cement-stabilized macadam during the construction hardening stage under the common cement content is calculated. Based on the cracking criterion and the cement stabilized crushing The stone base is prone to early cracking.