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结合杭浦(杭州—浦东)高速公路和嘉绍(嘉兴—绍兴)高速公路实际工程,对桥头过渡段软基处理的加固效果进行研究。通过对现场监测数据的对比和分析,发现变间距等桩长管桩布桩方式的加固效果优于变桩长等间距布桩方式;提出了适合前者的计算方法,并证明了该法适用于嘉绍高速公路桥头过渡段;通过PLAXIS有限元软件分别对两种管桩布桩方式进行模拟,证明变间距等桩长布桩方式对土体的加固效果优于变桩长等间距布桩方式;通过对嘉绍高速公路实测数据的研究发现,随着预应力管桩间距增大,沉降量也增大,但大间距布桩造价优于小间距,所以在过渡段设计时需综合考虑工程造价和加固效果。
Based on the actual project of Hangpu (Hangzhou-Pudong) expressway and Jiashao (Jiaxing-Shaoxing) expressway, the reinforcement effect of soft foundation treatment at transitional section of bridgehead is studied. Through the comparison and analysis of the on-site monitoring data, it is found that the reinforcement effect of the piles with long piles with variable spacing is better than the piles with the same distance between piles. The calculation method suitable for the former is proposed and the method is proved to be suitable for Jiaosha Expressway Bridgehead transition section; by PLAXIS finite element software to simulate the two kinds of pipe pile piles, respectively, to prove that the variable pitch pile length piles reinforcement effect on soil is better than the change piles long equal spacing piles way Through the research on measured data of Jiashao Expressway, it is found that as the spacing between prestressed pipe piles increases, the settlement also increases, but the cost of large spacing piles is better than that of small spacing, so the design of the transitional section should be considered synthetically Cost and reinforcement effect.