沉积作用及应力历史对自重应力和沉降的影响

摘要

土体的沉积作用和应力历史会影响土体自重应力的确定,也会影响地基最终沉降量的确定.鉴于e-lnp比e-lgp坐标图能更方便、精确地描述线性问题,根据e-lnp坐标图推导沉积作用对成层土、正常固结土、超固结土的自重应力与沉降影响的计算式.用该计算式对昆明滇池国际会展中心部分深厚软土地基的自重应力和最终沉降量进行计算,并用计算结果和不考虑沉积作用及应力历史影响的计算结果进行对比分析,结果表明,沉积作用对深厚软粘土自重应力和最终沉降量计算值的影响非常显著,并且土体厚度越厚、上覆荷载越大,其影响越明显.%Soil sedimentation and stress history have great impact on the determination of soil gravity stress and the final settlement of the foundation soil.Due to the accurate and convenient of coordinate in dealing with the linear problem over coordinate,thus it is often applied to calculate the influence of sedimentation and gravity stress of the normal consolidated soil and over-consolidated soil.This formula is to used to calculate the gravity stress value and final settlement value of deep soft clay which came from Kunming exhibition Center near Dianchi Lake,while the calculation result is used to make a comparison with historical data of stress value and settlement impact.The result showed that the sedimentation has great impact to the gravity and final settlement value of deep soft clay,furthermore,the thicker of the soil will bring the bigger of the overlying load consistently.