邻近加载下桩网结构路基离心模型试验研究

以邻近杭深铁路桩网结构路基的新建乐清湾铁路路基填筑作为工程原型，通过土工离心模型试验模拟工程建设过程中不同邻近加载条件下土体及桩网结构路基变形。结果显示:加载距离由4 cm增加到8 cm时，基桩最大水平位移由120 mm下降到60 mm；同一加载工况中，各排桩水平变形差异主要位于上中段三分之二桩体；前排桩基通过自身较大的水平变形可限制水平土压力与位移发展。

Study on Centrifugal Model Tests of Pile-net Subgrade under Adjacent Loading

Taking the newly-built Yueqingwan railway subgrade filling near the existing pile-net subgrade of Hangzhou—Shenzhen railway as the engineering prototype, the soil and pile-net subgrade deformation under different adjacent loading conditions during engineering construction period was simulated by geotechnical centrifugal model test. The results show that when the loading distance increases from 4 cm to 8 cm, the maximum horizontal displacement of the pile foundation decreases from 120 mm to 60 mm; in the same loading condition, the horizontal deformation difference of each row of piles is mainly located in two-thirds of the upper and middle piles; the front row pile can limit the development of horizontal earth pressure and displacement through its large horizontal deformation.