考虑井阻随时空变化的竖井地基大应变非线性固结分析

doi:10.13722/j.cnki.jrme.2022.0332

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摘要高压缩性软土具有典型的几何非线性和材料非线性特征，但目前能考虑井阻随时空同时变化的高压缩性土竖井地基大应变非线性固结解答还很鲜见。考虑土体的非线性压缩渗透特征，引入随时间和深度同时变化的变井阻模型，在拉格朗日坐标系下建立以超静孔压为变量的竖井地基大应变非线性固结模型。利用有限差分法获得模型的数值解答，并将其与特殊情况下竖井地基小应变解析解及大应变固结解对比分析以验证其可靠性。不同工况下竖井地基大应变固结性状分析表明：井阻随时空演化的变井阻效应会明显降低竖井地基的固结速率，且井阻的时间效应对固结速率的影响更明显，但变井阻效应并不会影响竖井地基的最终沉降量；初始有效应力均匀分布下的竖井地基固结速率相比其随深度线性增加时较慢，且2种情况下的竖井地基最终沉降值一般不再相等，沉降曲线间的差异也较大；任意深度处井周流入砂井的流量均相等的假定导致竖井地基固结速率偏快，使实际计算会过高估计竖井地基的固结速率；竖向渗流对地基固结的促进作用随竖井长度与竖井影响区半径之比的增大而减小。

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	李阔
	李传勋

关键词 ：土力学, 竖井地基, 大应变理论, 井阻效应, 非线性固结, 竖向渗流

Abstract：The soft soil with high compressibility has typical geometric and material nonlinearities. However，the solutions for the large strain consolidation of soils with vertical drain，in which the time-and depth-dependent well resistance are considered，are rarely reported in the literature. Considering the nonlinear compressibility and permeability，and the time-and depth-dependent well resistance，a large-strain nonlinear consolidation model of soils with vertical drain is established in the Lagrangian coordinate system，in which the excess pore water pressure serves as a variable. The numerical solution for this consolidation model is derived by the finite difference method. The numerical results are compared with the existing small-strain analytical solution and large-strain numerical solution for the vertical drain ground to verify the correctness of the presented method. Then，the consolidation behavior analysis of the large-strain consolidation of soils with vertical drains under different conditions is performed，and the results show that the space-time variation of well resistance significantly reduces the consolidation rate. The time-dependent well resistance has a greatly impact on the consolidation rate. However，the final settlement of vertical drain ground can not be affected by the time-and depth-dependent well resistance. The consolidation rate under the uniform distribution of initial effective stress is less than that under the linear distribution. The final settlement values of the vertical drain ground in the two cases are not equal，and the differences between the two settlement curves are greatly large. The assumption that the discharge capacity flowing into the vertical drain at any depth are constant results in the faster consolidation rate，and overestimates the actual consolidation rate of the vertical drain. The promotion effect of vertical flow on the consolidation of vertical drain decreases as the ratio of the length to the influential radius of drains increasing.

Key words： soil mechanics soils with vertical drain large-strain consolidation effects of well resistance nonlinear consolidation vertical flow

引用本文:

李阔，李传勋. 考虑井阻随时空变化的竖井地基大应变非线性固结分析[J]. 岩石力学与工程学报, 2023, 42(S1): 3743-3754.
LI Kuo，LI Chuanxun. A numerical solution for nonlinear large-strain consolidation of soils with #br# vertical drains by considering time-and depth-dependent well resistance. , 2023, 42(S1): 3743-3754.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0332 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3743

[1]	BARRON R A. Consolidation of fine-grained soils by drain wells[J]. Transactions of American Society of Civil Engineers，1948，74(6)：718-742.
[10]	黄朝煊. 软土地基一维非线性固结简化解法研究[J]. 长江科学院院报，2018，35(12)：90-95.(HUANG Chaoxuan. Simplified solution of one-dimensional nonlinear consolidation of soft soil foundation[J]. Journal of Yangtze River Scientific Research Institute，2018，35(12)：90-95.(in Chinese))
[11]	江辉煌，赵有明，刘国楠，等. 砂井地基的大变形固结[J]. 岩土工程学报，2011，33(2)：302-308.(JIANG Huihuang，ZHAO Youming，LIU Guonan，et al. Large strain consolidation of soft ground with vertical drains[J]. Chinese Journal of Geotechnical Engineering，2011，33(2)：302-308.(in Chinese))
[20]	NGUYEN B P，KIM Y T. Radial consolidation of PVD-Installed normally consolidated soil with discharge capacity reduction using large-strain theory[J]. Geotextiles and Geomembranes，2019，47(2)：243-254.
[21]	NGUYEN B P，MAN A，PRADHAN S，et al. Large-strain consolidation analysis of PVD-installed soft soil considering the discharge capacity variation according to depth and time Discharge capacity variation[J]. Engineering Computations，2021，38(4)： 1 652-1 676.
[3]	HANSBO S. Consolidation of fine-grained soils by prefabricated drains[C]// Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering. Stockholm：[s. n.]，1980：677-682.
[5]	谢康和，周开茂. 未打穿竖向排水井地基固结理论[J]. 岩土工程学报，2006，28(6)：679-684.(XIE Kanghe，ZHOU Kaimao. Consolidation theory for soft soil with partially penetrated vertical drains[J]. Chinese Journal of Geotechnical Engineering，2006，28(6)：679-684.(in Chinese))
[13]	张明，王威，刘起霞，等. 考虑幂函数渗透压缩变化的双层砂井地基固结性状[J]. 岩土力学，2013，34(11)：3 117-3 126. (ZHANG Ming，WANG Wei，LIU Qixia，et al. Consolidation behaviors of double-layered vertical drains ground considering power function permeability and compressibility variation[J]. Rock and Soil Mechanics，2013，34(11)：3 117-3 126.(in Chinese))
[15]	曹玉鹏，孙宗军，丁建文，等. 高含水率疏浚泥轴对称大应变固结模型[J]. 岩土工程学报，2016，38(10)：1 904-1 910.(CAO Yupeng，SUN Zongjun，DING Jianwen，et al. Axisymmetric large-strain consolidation model for dredged clay with high water content[J]. Chinese Journal of Geotechnical Engineering，2016，38(10)：1 904- 1 910.(in Chinese))
[7]	INDRARATNA B，SATHANANTHAN I，RUJIKIATKAMJORN C，et al. Analytical and numerical modeling of soft soil stabilized by prefabricated vertical drains incorporating vacuum preloading[J]. International Journal of Geomechanics，2005，5(2)：114-124.
[17]	INDRARATNA B，RUI Z，FOX P J，et al. Large-strain vacuum- assisted consolidation with non-darcian radial flow incorporating varying permeability and compressibility[J]. Journal of Geotechnical and Geoenvironmental Engineering，2016，143(1)：1-9.
[4]	周开茂，谢康和，应宏伟，等. 双面排水条件下未打穿竖井地基固结计算[J]. 浙江大学学报：工学版，2007，41(1)：151-156.(ZHOU Kaimao，XIE Kanghe，YING Hongwei，et al. Computation for consolidation of soft soil with partially penetrated vertical drain under double-drainage condition[J]. Journal of Zhejiang University：Engineering Science，2007，41(1)：151-156.(in Chinese))
[8]	周琦，刘汉龙，陈志波. 考虑固结参数变化时砂井地基的非线性径向固结[J]. 岩土力学，2007，28(增)：855-858.(ZHOU Qi，LIU Hanlong，CHEN Zhibo. Non-linear radial consolidation of sand- drained ground with varying volume compressibility and horizontal permeability[J]. Rock and Soil Mechanics，2007，28(Supp.)：855-858.(in Chinese))
[9]	LU M，WANG S，SLOAN S W，et al. Nonlinear consolidation of vertical drains with coupled radial-vertical flow considering well resistance[J]. Geotextiles and Geomembranes，2015，43(2)：182-189.
[12]	HUSSEY M，GIBSON R E，ENGLAND G L. The theory of one-dimensional consolidation of saturated clays：1. Finite non-linear consolidation of thin homogeneous layers[J]. Géotechnique，1967，17(3)：261-273.
[14]	孙立强，贾天强，闫澍旺，等. 基于大变形的未打穿砂井固结理论研究[J]. 岩石力学与工程学报，2017，36(2)：504-512.(SUN Liqiang，JIA Tianqiang，YAN Shuwang，et al. Study on consolidation theory of foundation with partially penetrated sand wells based on large strain[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(2)：504-512.(in Chinese))
[16]	CAO Y，ZHANG J，XU J，et al. A large-strain vacuum-assisted radial consolidation model for dredged sludge considering lateral deformation[J]. KSCE Journal of Civil Engineering，2020，24(10)：1-12.
[18]	KIM R，HONG S J，LEE M J，et al. Time dependent well resistance factor of PVD[J]. Marine Georesources and Geotechnology，2011，29(2)：131-144.
[19]	DENG Y B，XIE K H，LU M M，et al. Consolidation by prefabricated vertical drains considering the time dependent well resistance[J]. Geotextiles and Geomembranes，2013，36(2)：20-26.
[22]	江文豪，詹良通. 考虑井阻效应及径向渗透系数变化下砂井地基的大变形固结[J]. 岩土力学，2021，42(3)：755-766.(JIANG Wenhao，ZHAN Liangtong. The large strain consolidation of sand-drained ground considering the well resistance and the variation of radial permeability coefficient[J]. Rock and Soil Mechanics，2021，42(3)：755-766.(in Chinese))
[24]	江辉煌. 砂井处理超软地基的固结计算[博士学位论文][D]. 北京：中国铁道科学研究院，2009.(JIANG Huihuang. Consolidation calculation of super-soft ground with vertical drains[Ph. D. Thesis][D]. Beijing：China Academy of Railway Sciences，2009.(in Chinese))
[23]	TANG X W，ONITSUKA K. Consolidation by vertical drains under time-dependent loading[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2015，24(9)：739-751.
[25]	LIU S J，SUN H L，PAN X D，et al. Analytical solutions and simplified design method for large-strain radial consolidation[J]. Computers and Geotechnics，2021，134(118)：103987.
[6]	DAVIS E H，RAYMOND G P. A non-linear theory of consolidation[J]. Géotechnique，2015，15(2)：161-173.
[2]	HANSBO S. Influence of mobile particles in soft clay on permeability[C]// International Symposium on Soil Structure. Gothenburg：[s. n.]，1973：132-136.