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对现行规范路基设计指标进行分析,提出规范修编的有关建议。现行规范规定的路基压实度、CBR控制指标未与交通等级挂钩,未充分考虑汽车荷载附加应力的影响深度和不同环境因素对路基强度的要求;现行规范确定路基回弹模量,经验性的因素较多,设计取值未充分考虑汽车动荷载和干湿、冻融循环作用对路基长期性能的影响;路表弯沉作为设计控制指标,其理论体系的假设条件与路基实际的工作条件不完全相符,难以控制路基塑性累积变形。对此,建议依据交通等级和路基工作区重新修订路基压实度、CBR标准,并建议将动回弹模量作为路基设计指标纳入规范,确保路基具有足够的强度和抗变形能力。
Analysis of the existing normative subgrade design index, put forward the relevant norms of standard revision. Subgrade compaction degree and CBR control index are not linked with traffic grade as stipulated in the current code, and the influence depth of additional stress of vehicle load and the requirements of different environmental factors on subgrade strength are not fully taken into consideration. The current code determines the subgrade resilience modulus and the empirical Many factors, the design value did not fully consider the vehicle dynamic load and wet-dry, freeze-thaw cycle effect on long-term performance of subgrade; deflection of road surface as a design control index, the theoretical system of assumptions and subgrade actual working conditions are not Fully consistent, it is difficult to control the cumulative plastic deformation of roadbed. In this regard, it is suggested that CBR standards should be revised based on the traffic grade and subgrade work area. It is suggested that the dynamic rebound modulus should be included as a guideline for subgrade design to ensure sufficient strength and deformation resistance of subgrade.