软土地基分级堆载预压沉降预测方法  

Settlement prediction method for staged preloading on soft clay ground

作　　者：袁威 朱润田 苏银强 冯启 储诚富[4] 邓永锋[1] Yuan Wei;Zhu Runtian;Su Yinqiang;Feng Qi;Chu Chengfu;Deng Yongfeng(School of Transportation,Southeast University,Nanjing 211189,China;Hegang Highway Co.,Ltd.,Zhuhai 519000,China;College of Transportation Engineering,Nanjing Tech University,Nanjing 211816,China;School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]东南大学交通学院,南京211189 [2]珠海鹤港高速公路有限公司,珠海519000 [3]南京工业大学交通运输工程学院,南京211816 [4]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《Journal of Southeast University(English Edition)》2024年第1期41-48,共8页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.42172307,42072293).

摘　　要：为了准确预测分级堆载预压条件下软土地基的沉降,对Asaoka法进行了改进.考虑土体固结系数随荷载的变化,对沉降预测线的斜率进行了修正,并给出了预测线截距的预测计算方法.改进的Asaoka方法考虑了固结应力对固结系数的影响和土体固结的非线性.通过室内固结试验和现场监测,验证了改进方法的可靠性.结果表明,固结系数C_(v)不是常数,它满足与固结压力P的关系C_(v)=aln(blnP),拟合良好,误差小于5%.不同应力水平下的沉降预测线并不平行,与原始的Asoaka方法相比,改进方法误差率较低.改进的Asaoka方法比传统方法具有更高的预测精度,能够可靠地预测分级堆载预压过程中软土地基的沉降.To accurately predict the settlement of soft soil foundations under graded surcharge preloading,the Asaoka method was improved.Considering the change in the soil consolidation coefficient with load,the slope of the settlement prediction line was modified,and a prediction calculation method for the prediction line intercept was used.The improved Asaoka method considered the influence of consolidation stress on the consolidation coefficients and nonlinearity of soil consolidation.The reliability of the improved method was then verified through indoor consolidation tests and field observation.The results demonstrate that the consolidation coefficient C_(v) is not a constant,and it satisfies the relationship with the consolidation pressure P:C_(v)=aln(blnP),which has an error of less than 5%.The settlement prediction lines at various stress levels are not parallel,and the improved method exhibites a lower error rate than the original Asoaka method.The improved Asaoka method offers higher prediction accuracy than the traditional method and can reliably predict the settlement of soft soil foundations during graded surcharge preloading.

关 键 词：ASAOKA法 沉降预测 分级堆载 固结系数 

分 类 号：TU447[建筑科学—岩土工程]