天津滨海新区吹填土快速结壳技术的试验研究

Test Research of Clipping Encrustation Technique on Dredger Fill in Tianjin Binhai New Area

从有效应力圆和强度增长的角度,分析了真空预压法和真空联合堆载预压法的加固机理和不同的加固特征.以天津滨海新区吹填土为研究对象,从改变边界条件的角度,提出了一套完整的试验方案对真空预压方法进行改进.经过10,d的室外现场模拟试验,使处于泥浆状态的吹填土表层形成了40～60 cm的硬壳,其地基承载力可达40 kPa以上,为进一步加固处理土体提供了平台.

The strengthening mechanism and character of vacuum pre-loading methods and vacuum piled-load pre-loading methods were analyzed based on the effective stress circle and strength increasement. According to the dredger fill in Tianjin Binhai New Area, a set of trial scheme was put forward to improve the vacuum pre-loading method by changing the boundary conditions. After 10 days on-site test of this scheme, the slimy dredger fill formed into a crust of 40-60 cm thickness and its ground bearing capacity exceeded 40 kPa. This process provided a platform on the succeeding strengthening treatment.