室内承载板法测定土基回弹模量的理论修正

Theoretic Modifications of Earth Subgrade Resilient Modulus Tested By Laboratory Bearing Plate

土基回弹模量是路面结构设计中一个重要的参数,能否选用合乎实际的土基回弹模量直接关系到路面结构的安全性和经济性。由于野外承载板法费时、费力,且测点位置的选取以及测点多寡对回弹模量的影响,室内试验是一种不可缺少的方法。以弹性层状体系理论为基础,对室内承载板法测定土基回弹模量进行了理论修正,利用有限元程序求出修正系数,并通过实例工程进行验证,结果表明室内承载板测定土基回弹模量应乘以0.95这个修正系数,为室内合理测定土基回弹模量值提供参考依据。

Earth subgrade resilient modulus is an important parameter of highway structure design. The actual earth subgrade resilient modulus is related with safety and economy of highway structure. Indoor tests are necessary because of disadvantages of outdoor tests. On the basis of elastic layer theory, theoretic modification coefficient of resilient modulus is put forward with finite element program. After the result is verified with actual projects,it is shown that subgrade resilient modulus by indoor bearing plate should be multiplied the coefficient 0. 95 so as to provide references for testing subgrade resilient modulus reasonably in laboratory.