【摘要】 基于分层总和法和已有的真空预压沉降计算方法,考虑真空度沿排水体深度方向的衰减性状,提出了一种改进的真空预压沉降计算方法,并结合已有工程实例对其进行了验证.结果表明,真空度沿深度方向的衰减速率对沉降计算值具有显著影响.真空度衰减速率越大,沉降计算值越小.当不考虑真空度衰减时,沉降计算值较大且明显偏离实测值,误差为48.4%~93.3%;当真空度衰减速率为3.5~4.5 k Pa/m时,沉降计算值和实测值相差较小,误差为-18%~10%,能够满足工程设计精度要求.因此,在进行真空预压沉降计算时应考虑真空度衰减,并建议在缺乏可靠真空度衰减实测资料时,将真空度沿深度方向的衰减速率取为3.5~4.5 k Pa/m.更多还原

【Abstract】 Based on the layer wise summation method and the existing calculation method for vacuum preloading induced settlement,a modified calculation method for vacuum preloading induced settlement considering the attenuation regulation of the vacuum degree along the drainage board is proposed and verified using measured datafrom literatures. The results showthat the influence of the attenuation coefficient of the vacuum degree along the depth on the calculated settlement is significant. The larger the attenuation coefficient of vacuum degree,the smaller the calculated settlement. When the attenuation rate of the vacuum degree is not considered,the calculated settlement is larger and deviates significantly from the measured data with the errors of 48. 4% to 93. 3%. When the attenuation rates of the vacuum degree are 3. 5 to 4. 5 k Pa / m,the calculated settlement is close to the measured one with the errors of- 18% to 10%,which satisfies the precision requirements of engineering design. Therefore,the attenuation of the vacuum degree should be considered during the calculation of vacuum preloading settlement. The attenuation rates of the vacuum degree along the depth is advised to be taken as 3. 5 to4. 5 k Pa / m when the measured vacuum degrees along the depth are absent.更多还原