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本文采用模型试验对土工格室加固高速铁路路基进行研究，对比分析了土工格室加筋路基与未加筋路基的动应力分布与累积沉降发展情况，通过改变土工格室的铺设层数，探究层数对路基加固效果的影响。结果表明：在长期循环荷载作用下，土工格室能够显著改变路基土体应力分布，提高路基的承载能力，降低路基的累积沉降，充分体现了其柔性筏基效应和垂直应力分散作用；随加筋层数的增加路基加固效果提升明显；在分级荷载作用下，随荷载的增大土工格室加固效果逐渐提升，但加筋层数的增加，对路基动应力分布影响较小；在相同条件下，土工格室加筋层数与路基土压力幅值、累积沉降呈负相关，加筋层数越多，路基动应力幅值和累积沉降越小，格室的加固效果越好。
Abstract：Model tests were used to study the reinforcement of high speed railway foundation by geocells. The dynamic stress distribution and cumulative settlement deformation development of geocellular reinforced roadbed and unreinforced roadbed were compared and analyzed. The influence of the number of layers on the strengthening effect of roadbed is explored by changing the number of layers laid in geocells. The results show that under long-term cyclic loading, geocells can significantly change the stress distribution of the soil, improve the bearing capacity of the roadbed, reduce the cumulative settlement and deformation of the roadbed, and give full play to the flexible foundation and vertical stress dispersion of the geocells. With the increase of the number of reinforced layers, the effect of subgrade reinforcement is obviously improved. Under the action of graded loads, the reinforcement effect of geocell gradually increases with the increase of load, but the increase of the number of reinforced layers has little effect on the dynamic stress distribution of the roadbed. Under the same conditions, the number of reinforced layers in the grid chamber is negatively correlated with the amplitude of soil pressure and cumulative settlement deformation of the subgrade. The more the number of reinforced layers, the smaller the dynamic stress amplitude and cumulative settlement deformation of the subgrade, and the better the reinforcement effect of the grid chamber.
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基本信息:
中图分类号:U238;U213.1
引用信息:
[1]童立红,胡子奇,管凌霄,等.土工格室加固高速铁路路基的动力响应[J].铁道建筑,2025,65(11):41-47.
基金信息:
国家自然科学基金(52168049)