关键词: 地基沉降;条形基础;散体介质特征;分层总和法;

Abstract: At present, the standard method and the layerwise summation method are generally used to calculate coarse-grained subgrade settlement in engineering.However, these methods are established based on the continuum theory, which are not consistent with engineering facts, and the results also have some deviations.Therefore, in this paper, considering the granular medium characteristics of coarse-grain soils, the additional stress analysis method of coarse-grain subgrade under strip uniform loads is established, and the nonlinear model of deformation mechanics parameters changed with subgrade deformation is established based on the mechanics theory of pore medium.On this basis, an improved layerwise summation method is proposed, which is applied to calculate coarse-grained subgrade settlement.Finally, the settlements of a case are calculated respectively by the standard method, the layerwise summation method and this improved method, and are compared with test monitoring result.The results show that the calculation result of this improved method of coarse-grained subgrade under strip foundation is closer to test monitoring result.The reasonability and feasibility of this improvement method are verified.

Key words: subgrade settlement; strip foundation; granular medium characteristics; layerwise summation method;