塑料排水板处理软基的离心机试验研究

京沪高速铁路沿线软土分布广,为了选择合理的软土路基处理方法,通过无处理软土路基和塑料排水板地基的土工离心模型试验,探讨了路基不同点沉降与时间的关系、不同深度处横向位移的大小以及塑料排水板对路基沉降控制的效果.结果表明,最大沉降都发生在路堤面中心线处,最大水平位移发生在坡角下6.6 m的地基中,荷载影响深度约为13 m.塑料排水板地基与无处理地基相比,沉降有所减小,但竣工3年时沉降仍未稳定下来,因此应与其他软基处理方法联合应用.

Centrifuge Experiment to Improve Soft Foundation through Plastic Wick Drain

In order to improve soft soil foundation,the time-dependent variation of foundation settlement,lateral displacement of different depth and effect of plastic wick drain on foundation settlement control were studied,on the basis of centrifuge experiments of nature foundation and plastic wick drain foundation.For both foundations,the biggest settlement happened in the center of embankment surface and the biggest lateral displacement at 6.6 m beneath slope foot,with depth of load influence being about 13 m.Comparing to natural foundation,less settlement occurred on plastic wick drain foundation,but settlements still grew 3 years later after completion of the engineering.Thus,plastic wick drain should be used together with other methods to improve soft soil foundation.