关于塑料排水带有效打入深度的讨论

DISCUSSION ON THE EFFECTIVE PENETRATING DEPTH OF PLASTIC DRAINAGE BELT

按《塑料排水带地基设计规程》规定 ,塑料排水带打入软地基的深度按工程允许沉降量确定。但塑料带排水法能减少的工后沉降和有效的打入深度是有争议的问题。根据现场实测资料说明 ,软弱地基强度越低、越深厚、侧向位移越大 ,则塑料带排水法对深部土层的加固效果越差。对澳门机场采用塑料带排水法取得良好效果的条件进行的分析 。

At present, the penetrating depth of plastic drainage belt in soft groundwork is determined according to the allowed settlement of relevant engineering project, as required in “The Code of Design for The Foundation with Plastic Drainage Belt'. However, there are still some problems needed to discuss and study, such as how many post construction settlements can be reduced, what the effective penetration depth will be, etc. Based on the in situ measured data, it is indicated that for such drainage method, the lower of strength of soft soil, or the thicker of foundation stratum, or the larger of lateral deformation of the soft foundation, the poorer of effect of strengthening soil will be in deep position of foundation. Moreover, the problem of why the good result can be reached at Macao Airport, using drainage belt method in deeper penetration,was also analyzed and differentiated.It is expected that presenred study would be helpful to promote the discussion on this problem to avoid the design of excessive and unnecessary penetrating depth.