Abstract: To control the degree of compaction and settlement after construction,it is important to predict accurately the developing trend of the settlement and density of the soft soil foundation during surcharge preloading.By triaxial compression creep experiments,the creep characteristic (settlement) of the soft soil under vertical loads (with constant confining stress) was obtained.And the function of the relationship between the settlement,density and the degree of the loads,the time under the loads was also got through the analysis of the regression.And then,with the function of the relationship,a deep discussion on the prediction of the last settlement and the degree of the compaction,the control of the time under surcharge preloading and the velocity of the settlement was made.And it could be used as a guidance and reference to the practical engineering.

Key words: load pre-pressure, settlement, triaxial creep experiment, soft soil foundation

摘要： 准确预测道路软基在堆载预压过程中变化趋势,对控制其固结度和工后沉降极其重要。通过室内三轴蠕变试验,观测到软土在竖向荷载(恒定围压)作用下的(沉降)变形趋势,并回归分析得出沉降量、密度与荷载大小、荷载作用时间的关系函数。运用得到的关系式,对最终沉降量和固结度预测、预压工期和沉降速率控制进行了进一步的讨论。可对实际工程起到一定的指导和借鉴作用。

关键词: 堆载预压, 沉降, 三轴蠕变试验, 软弱地基