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考虑真空度沿竖井线性减小、堆载所引起的附加应力随深度变化以及地基涂抹区水平渗透系数呈线性变化,推导了附加应力变化的真空-堆载预压下竖井地基固度的一个解析解,并分析了地基固结性状。分析结果表明,在荷载瞬时施加时,真空预压的大小及沿竖井的衰减快慢对地基的固结速度没有影响;在单面排水条件下,竖井地基顶面的附加压力越大,固结越快;在地基井径比和水平渗透系数与竖向渗透系数之比较小时,地基的竖向渗流对地基的固结度有较大的影响。
Considering that the vacuum degree decreases linearly along the shaft, the additional stress caused by the pile load varies linearly with the depth and the horizontal permeability coefficient of the foundation smear zone, an analytical solution to the vacuum-surcharge preloading of the shaft foundation is deduced Solution, and analysis of the foundation consolidation properties. The analysis results show that the magnitude of vacuum preloading and the speed of attenuation along the shaft have no effect on the consolidation speed at the moment when the load is applied instantaneously. Under the condition of single-side drainage, the greater the additional pressure on the top of the shaft foundation, Fast; when the ratio of the foundation hole diameter and the horizontal permeability coefficient to the vertical permeability coefficient is small, the vertical seepage of the foundation has a greater influence on the degree of consolidation of the foundation.