推算最终沉降中工后次固结沉降比例研究

为了更准确地预测工后沉降,利用室内常规压缩试验、长期压缩试验和现场试验研究了三点法、双曲线法、星野法等最终沉降推算方法推算的黏性土地基最终沉降与工后次固结沉降的关系。研究表明,采用三点法推算的黏性土地基最终沉降包含的工后次固结沉降较少,采用双曲线法推算的黏性土地基最终沉降包括约23%～52%的工后次固结沉降,采用星野法推算的黏性土地基最终沉降基本包含了绝大部分工后次固结沉降。故建议采用三点法和双曲线法推算黏性土地基最终沉降并预测工后沉降时还应考虑工后次固结沉降。

Study on post-construction secondary consolidation settlement in the predicted ultimate settlement

To predict post-construction settlement more accurately, relationship between ultimate settlement of clay ground predicted by three-point method, hyperbola method or Hushino method and post- construction secondary consolidation settlement is investigated through conventional consolidation tests, long term consolidation tests and in-situ experiments. It show that a little post-construction secondary consolidation settlement is included in the ultimate settlement of clay ground predicted by the three-point method, 23% -52% of post-construction secondary consolidation settlement is included in the ultimate settlement of clay ground predicted by hyperbola method, and most post-construction secondary consolidation settlement is included in the ultimate settlement of clay ground predicted by Hushino method. Post-construction secondary consolidation settlement should be calculated when three-point method or hyperbola method is used to predict ultimate settlement of clay ground and post-construction settlement.