长江细砂路基排水模型试验研究

Test & Research on Drainage Model of Subgrade Composed of Changjiang River Sand

水是道路危害最主要的自然因素之一。结合上海市外环线(浦东段)二期工程进行的长江细砂路基排水模型试验研究结果表明,长江细砂具有较强的饱水能力,在最佳含水率附近碾压不会产生排水现象。砂在注水情况下,路基密实效果不明显,不宜采用水密法施工方式;高含水率的长江细砂在碾压过程中会通过盲沟排水,排水历时与碾压历时基本一致。

Water is one of the most important natural factors in road failure. The test & research results of drainage model of Changjiang River sand subgrade for Shanghai Outer Ring Line (Pudong section) 2nd phase project show that the Changjiang River sand is of pretty strong water-saturation ability and will not drain if rolling is made around place of optimum moisture content. As the subgrade is of unobvious dense effect when the sand is under flooding, it's not suitable to adopt water-tightness construction method. Changjiang River sand of high moisture content would drain through blind ditch under rolling condition, the draining duration is almost the same as rolling duration.