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软土地基上的路基施工常采用沉降速率法确定超载卸荷时间。现有的沉降速率法主要依据地方经验沉降速率标准,无法与获得的工后沉降相联系。基于分级加荷条件下地基固结度计算的改进太沙基公式,推导出超载沉降速率与等载工后沉降间的关系式,据此建立按容许工后沉降控制的超载预压卸荷沉降速率标准。有限元数值模拟分析表明,相对于地方经验沉降速率标准过于严格,该沉降速率标准卸荷控制的工后沉降满足规范要求。通过应用于实际工程,给出了超载卸荷时间。
Subgrade construction on soft soil often uses settlement rate method to determine the time of overloading and unloading. The existing settling rate method is mainly based on the local empirical settling rate standard and can not be related to the post-construction settlement obtained. Based on the modified Taishaziji formula for the calculation of the consolidation degree of foundation under the condition of grading and loading, the relation between the overloading settlement rate and the settlement after the equivalent loading is deduced. Based on this, an overloading preload settlement with allowable post-construction settlement control is established Rate standard. Finite element numerical simulation shows that compared with the local experience, the settlement rate standard is too strict. The settlement after the standard unloading control of settlement rate meets the specification requirements. By applying it to actual engineering, the overload and unloading time is given.