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沉降变形与卸载标准是铁路路基堆载预压的主要问题。针对处于沿海滩涂软土路基之上的铁路专用线,采用插塑板与堆载预压相结合的方案进行地基处理,开展了大量的表层沉降、孔隙水压力、分层沉降等观测项目。据实测资料,总结分析了路基表面的沉降规律,并考虑了路基分层沉降与孔隙水压力的变化规律,全面地揭示了整个路基地层的沉降变化特征,运用双曲线合理地预测了工后沉降,且推算出路基整体的固结度,采用工后沉降与地基固结度建立卸载时机判别标准。为堆载预压的卸载时机判别标准研究提供了一种新的思路。
Subsidence deformation and unloading standards are the main problems of railway embankment preloading. Aiming at the special railway line on the soft soil roadbed along the beach, the plan of foundation treatment is carried out by the combination of the insertion of prestressed plastic plates and preloading, and a great deal of observation items such as surface subsidence, pore water pressure and stratified settlement are carried out. According to the measured data, the subsidence law of subgrade surface is summarized and analyzed, and the change rule of subgrade settlement and pore water pressure of subgrade is considered. The subsidence variation characteristics of subgrade are revealed comprehensively. By hyperbola, Settlement, and calculate the degree of consolidation of the subgrade as a whole, using post-construction settlement and foundation consolidation criteria to establish the timing of unloading. It provides a new idea for the study on the criterion of unloading timing of preloading.