真空联合多级堆载下考虑井阻时空变化的竖井地基固结解析解

doi:10.13722/j.cnki.jrme.2022.0379

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摘要考虑到竖井地基固结过程中排水体井阻随时间和深度不断变化，基于等应变假定，针对堆载为多级加载及真空预压为单级加载的工况，引入竖井涂抹区渗透系数不同的变化模式，建立真空联合堆载预压下竖井地基固结模型，通过边界条件齐次化后设解的形式并解常微分方程获得固结模型对应的解析解。通过与已有的解析解及工程实测值对比，验证解析解的正确性并利用该解答开展固结性状分析。结果表明：变井阻理论更能够为最终负压沿深度线性衰减假定提供理论支撑；竖井排水能力衰减系数的增加及最终排水能力的减小都会使某时刻真空度随深度的衰减程度增大；竖井排水能力衰减系数越大，竖井固结速率越慢；最终排水能力越大，竖井固结速率越快；基于该固结模型在工前选取合适的真空加载值进行真空联合堆载预压能同时兼顾土体固结速率和经济效益。

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	史蓝天
	李传勋

关键词 ：地基基础, 真空预压, 多级堆载, 变井阻, 竖井地基, 解析解

Abstract：Considering the well resistance varies with time and depth during consolidation of soils with vertical drain，a consolidation model of soils with vertical drain under vacuum combined surcharge preloading was developed based on the equal strain assumption，aiming at the situation of multi-stage surcharge preloading and single stage application of vacuum preloading and incorporating the different decay modes of horizontal coefficient in smear zone. The analytical solution of the consolidation model is obtained by using the homogeneous boundary conditions and solving ordinary differential equations. Analytical solutions are verified for validity by comparing them to the existing analytical solution and the field data，and the consolidation behavior is investigated by the parametric analysis. The results indicate that the variable well resistance theory can theoretically support the assumption that the final negative pressure reduces linearly with the increase of depth. The degree of vacuum attenuating with depth at a specific time will grow as the attenuation coefficient of drainage capacity increases and the final drainage capacity of the vertical drain decreases. The larger the attenuation coefficient of drainage capacity is，the slower the consolidation rate of the vertical drain is. The larger the final drainage capacity is，the faster the consolidation rate of the vertical drain is. Based on the consolidation model in this paper，an appropriate vacuum loading value is selected before construction to carry out vacuum combined surcharge preloading，which can simultaneously take soil consolidation rate and economic benefit into account.

Key words： foundations vacuum preloading multi-stage surcharge preloading variable well resistance soils with vertical drain analytical solutions

引用本文:

史蓝天，李传勋. 真空联合多级堆载下考虑井阻时空变化的竖井地基固结解析解[J]. 岩石力学与工程学报, 2023, 42(S1): 3755-3766.
SHI Lantian，LI Chuanxun. Analytical solution for consolidation of soils with vertical drain considering time-and depth-dependent well resistance under vacuum and multi-stage surcharge preloading. , 2023, 42(S1): 3755-3766.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0379 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3755

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