考虑振动停歇时间的浅层软基振动排水试验研究

Experimental Research on Vibration Drainage of Shallow Soft Foundation Considering Vibration Rest Time

以江苏省连云港市某软基处理项目的软土为室内研究对象,利用自主设计的动态固结渗透仪分析饱和软土在交通荷载作用下的动力响应;通过设置不同围压、共振频率和振动停歇时间,以及模拟不同施工工况,进行软土的振动排水固结试验,并与未考虑振动停歇时间的振动排水固结试验进行对比,重点分析不同振动停歇时间对软土排水固结特性的影响。结果表明:在振动荷载停歇时间段软土排水固结效果明显改善;在振动停歇时间相同时,软土排水固结效果随着围压的增大呈现弱化趋势;在某共振频率下存在软土排水固结效果最优的停歇时间,且该时间随共振频率的变化而不同。

Taking the soft soil of a soft foundation treatment project in Lianyungang city of Jiangsu province as the indoor research object,a self-designed dynamic consolidation permeability apparatus was used to analyze the dynamic response of saturated soft soil under traffic loads.Through setting different magnitudes of confining pressure,resonance frequency,and vibration rest time,as well as simulating different construction conditions,vibration drainage consolidation tests of soft soil were carried out and compared with the vibration drainage consolidation test without considering vibration rest time,focusing on the analysis of the influence of different vibration rest time on drainage consolidation characteristics of soft soil.The results show that the drainage consolidation effect of soft soil is significantly improved during the period of vibration load suspension.With the same vibration rest time,the drainage consolidation effect of soft soil shows a weakening trend with the increase of confining pressure.At a given resonance frequency,there is an optimum vibration rest time with the best drainage consolidation effect of soft soil,and the time varies with the change of resonance frequency.