基层顶面当量回弹模量确定方法的修正

应用弹性层状理论,以弯沉等效为原则研究了基层顶面当量回弹模量的计算方法,指出了现有当量模量换算公式中存在的不足,并根据当量模量的影响因素确定了其边界条件,在大量计算分析的基础上重新建立了荷载作用半径为0.15 m的换算公式,并增加荷载作用半径影响修正系数.修正后的换算公式可适用于基层与土基模量比大于2且基层当量厚度大于0.2 m及荷载作用半径在0.1 m-0.5 m的基层顶面当量回弹模量的换算,具有更高的精度、更好的外延性.

Modified Calculation Method of Equivalent Modulus of Elasticity of Foundation

The calculation method of equivalent modulus of elasticity of foundation is studied in the principle of displacement equivalence by elastic multi-layer theory, and the boundary conditions are identified and studied based on the analysis of the influence factors for the calculation method of equivalent modulus. The deficiencies in the present calculation methods of equivalent modulus of elasticity of foundation are analyzed. Based on the analysis of great amount of computing data, the calculation expressions are reestablished when the load radius is 15 cm, which has better precision and extension, besides, the modified coefficient of load radius is added. The calculation expressions of equivalent modulus of elasticity of foundation are applicable to the calculation when the ratio of equivalent base modulus to subgrade modulus is greater than 2 and base equivalent thickness is greater than 20cm, and the load radius ranges from 10 cm to 50 cm.