应用沉降速率推算剩余沉降及卸载时间

在地基处理工程中工后沉降和沉降速率是卸载的重要标准,次固结沉降可以估算在一定范围 内,工后沉降满足要求与否则主要由剩余主固结沉降控制。基于砂进固结理论和Asaoka方法可以推算 出在堆载预压任意时间的沉降速率,运用沉降速率和剩余主固结沉降的关系,就可以推算出任意时间的 主固结剩余沉降及卸载时间。在深圳—香港西部通道填海及地基处理工程中,此方法应用效果较好。

Application of Settlement-Velocity to Calculate Residual Settlement and Unloading Time

The settlement-velocity and post construction settlement including residual settlement and secondary consolidation settlement are very important unloading standard in foundation soil treatment project. The secondary consolidation settle- ment can be estimated within range, and the post construction settlement is mainly controlled by residual settlement. In Asaoka method, the settlement-velocity can be calculated in preloading anytime. By applying the relationship between settle- ment-velocity and residual settlement, the residual settlement and unloading time can also be computed. The relationship be- tween settlement-velocity’ s logarithm and preloading time is linearity, thus the unloading time can be confirmed by the graph. The method is very effective in Shenzhen-Hongkong West Passage fill seafront and foundation soil treatment project, and may have preferable application value.