考虑变井阻的碎石桩复合地基非线性固结分析

doi:10.13722/j.cnki.jrme.2023.0757

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摘要碎石桩成桩过程中所产生的桩体堵塞效应会随深度发生变化。同时，随着桩周土体的固结，土颗粒会进一步对桩体产生淤堵效应，致使桩体通水能力随固结时间逐渐衰减。考虑到碎石桩井阻随时空不断演化及桩周土体的非线性压缩和渗透特性，建立多级加载下碎石桩复合地基非线性固结模型。利用有限差分法对该模型进行数值求解，并与现有特定工况下的固结理论进行对比分析，验证其可靠性。通过大量的算例分析以研究变井阻参数对碎石桩复合地基固结度影响，结果表明：碎石桩复合地基的固结速率会随井阻深度参数a和时间参数b的增大而变慢，随着最终排水能力?的增大而加快；相较而言，时间参数b对复合地基固结度的影响更明显。最后将考虑变井阻的碎石桩复合地基固结模型应用于马来西亚某路段的沉降计算，与已有的固结解答相比计算结果与实测值更相符，说明所建立的碎石桩复合地基固结模型具有更好的工程实用性。

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	马昊暄1
	李传勋1
	陆向综1
	郭霄2

关键词 ：基础工程, 碎石桩, 变井阻, 非线性, 多级加载, 竖向渗流

Abstract：The clogging effect caused by installing stone columns is depth-dependent. The movement of soil particles into the stone column caused by consolidation further contributes to the clogging effect of the column，which leads to the column permeability decaying temporally. Considering the temporal and spatial variation of the well resistance of stone columns as well as the nonlinear compressibility and the permeability of soils around the stone column，a nonlinear consolidation model of stone column composite foundation under multi-stage loading is established. The solution of the model is solved by the finite difference method，whose reliability is verified by comparing with the existing solutions under specific conditions. Extensive computations are analyzed to investigate the effect of variable well resistance parameters on the consolidation of stone column composite foundation. The results indicate that：the consolidation rate of the stone column composite foundation decreases as the temporally or spatially dependent well resistance parameter increases. Moreover，the consolidation rate accelerates as the final drainage capacity of the stone column increases. Among these factors，the effect of the temporal parameter on the consolidation rate of the composite foundation is more significant. Finally，the consolidation model of the stone column composite foundation considering variable well resistance is applied to the settlement calculation for an actual project in Malaysia. Compared to the existing solution，the theoretical result of the proposed model shows a better agreement with field measurement，indicating that the proposed consolidation model possesses a certain engineering practicability.

Key words： foundation engineering stone column variable well resistance nonlinearity multi-stage loading vertical flow

引用本文:

马昊暄1，李传勋1，陆向综1，郭霄2. 考虑变井阻的碎石桩复合地基非线性固结分析[J]. 岩石力学与工程学报, 2024, 43(4): 1013-1025.
MA Haoxuan1，LI Chuanxun1，LU Xiangzong1，GUO Xiao2. A numerical solution for nonlinear consolidation of stone column composite foundation considering variable well resistance. , 2024, 43(4): 1013-1025.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0757 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I4/1013

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