路床顶回弹模量的理解及计算探讨

Understanding and Calculation of Rebound Modulus of Roadbed Top

摘要:

路基是支撑路面结构的岩土结构物，路床顶回弹模量在路面结构设计中起重要作用，现行设计规范均对路床顶回弹模量提出最小值要求。实际工程中路床填土存在多种类型填料分层填筑碾压而成，由于回弹模量与级配和细料含量、压实度、含水率密切相关，因此路基每层土回弹模量均不一致，规范对于如何在设计初期根据路床填料计算路床顶回弹模量没有相关规定。通过对路床顶当量模量换算公式与弹性层状体系理论计算的对比分析，提出设计阶段计算路床顶回弹模量的计算方法。

Abstract:

Subgrade is the rock-soil structure to support the pavement structure. The rebound modulus of roadbed top is an important index in the pavement structure design. The minimum requirement of rebound modulus of roadbed top is put forward in current design codes. In actual engineering， the roadbed fill is made of layered filling and rolling by various types of fillers. As the rebound modulus is closely related to gradation， fine material content， compaction degree and water content， the rebound modulus of soil in each layer of subgrade is inconsistent. The code has no relevant provisions on how to calculate the rebound modulus of roadbed top based on roadbed filler at the initial stage of design. By comparing and analyzing the equivalent modulus conversion formula of roadbed top with the theoretical calculation of elastic layered system， a method to calculate the rebound modulus of the roadbed top in the design stage is proposed.