基于有效固结应力法的加筋垫层路堤稳定性计算方法

Application of Effective Consolidation Stress Method in Stability Analysis of Reinforced Embankment over Soft Foundation soils

摘要:

摘要：针对填方路基分期填筑的施工特点，采用了有效固结应力法进行软基加筋垫层路堤的稳定性分析。根据加筋垫层作用原理，通过筋材受力分析和加筋垫层路堤整体稳定的极限平衡分析，阐述了加筋垫层对路堤稳定性贡献的两种途径：潜在滑动面上筋材拉力切向分量直接产生的抗滑作用及其法向分量对土体抗剪强度提高的促进作用。综合考虑加筋垫层的加筋作用及软基在路堤施工过程中固结作用的影响，提出了加筋垫层路堤稳定性分析的改进有效固结应力法公式，并通过编程算例分析讨论了该公式的特点及适用性。

Abstract:

Abstract: The effective consolidation stress method was applicated to analyze the stability of reinforced embankment over soft foundation soils, considering the characteristics of staged-filling subgrade in construction. Based on the working mechanism of reinforced cushion, its two principles in improving the stability of embankment were illustrated by analyzing the tensile force of geosynthetics and the overall stability analysis of the embankment with limit equilibrium method. The results showed that not only the tensile force of geosynthetics can resist the sliding force directly on the tangent of potential failure surface, but its normal component also can enhance the shear strength of foundation soils. Taking the function of reinforced cushion and the consolidation of soft foundation soils during construction process into account, a modified formula of effective consolidation stress method was proposed, which can be used to analyze the stability of reinforced embankment over soft foundation soils. In addition, its features and applicability were studied by the calculation and analysis of engineering projects.