Effect of Deep Underground Water Recharge on Long-Term Settlements of Pile Foundations

doi:10.16183/j.cnki.jsjtu.2016.03.002

Abstract

Abstract:

Artificial recharge in deep strata is an effective method to prevent land subsidence, and make the deep strata upheave to some extent. The pile foundations of elevated road are relatively deep so that the deformation of deep strata will greatly affect the elevated road. Using the numerical method, the elevated pile and the behavior of the surrounding soil at pumping and recharge loads were simulated and its deformation characteristics were discussed based on the coupled theory. The result shows that groundwater pumping can cause a large settlement of elevated road, while the artificial recharge can control the settlement effectively. Regional land subsidence is smaller than the elevated settlement, but the deformation tendency matches the elevated road well. Besides, based on an engineering project, the long-term deformation characteristic of elevated road at underground water recharge was simulated. The study shows that numerical results agree with the filed data, and the deformation characteristics of elevated piles are mainly influenced by deep strata. Using parameter analysis, the basic laws of elevated deformation were obtained, providing reference for the prediction of long-term settlement of elevated piles.

Key words: deep underground water recharge, elevated pile, fluid-solid coupling, long-term settlement, numerical method

CLC Number:

TU313

HUANG Yizhang, SHI Yujin, CHEN Jinjian, WANG Jianhua. Effect of Deep Underground Water Recharge on Long-Term Settlements of Pile Foundations[J]. Journal of Shanghai Jiao Tong University, 2016, 50(03): 324-330.

Figures/Tables 9

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References 10

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层号	土层名称	H／m	γ／（kN·m^-3）	μ	E／MPa	k_v／（μm·s^-1）	k_h／（μm·s^-1）
②₁	粉质粘土	4	18.5	0.3	20.2	1.80×10^-3	3.30×10^-3
②₃	砂质粉土	14	18.8	0.3	50.0	1.92	3.42
④	淤泥质粘土	18.5	17.3	0.3	10.5	1.76×10^-3	2.94×10^-3
⑤	砂质粉土	23	18.2	0.3	25.1	6.27×10^-3	1.02×10^-2
⑥	粉质粘土	27	19.6	0.3	50.0	1.85×10-4	4.64×10^-4
⑦	粉砂	41	19.5	0.3	80.6	1.20×10^-1	3.00×10^-1
⑧	粉质粘土	66	18.0	0.3	60.6	2.71×10^-3	6.77×10^-3
⑨	中砂	91	19.9	0.3	150.0	1.00×10^-1	2.50×10^-1
⑩	粘土	105	18.0	0.3	150.0	1.91×10^-4	4.78×10^-4
?	砂土	165	18.0	0.3	150.0	1.00×10^-1	2.50×10^-1
?	粘土	190	18.0	0.3	150.0	1.14×10^-4	2.85×10^-4
?	砂土	218	18.0	0.3	150.0	1.00×10^-1	2.50×10^-1
?	粘土	250	18.0	0.3	150.0	1.00×10^-4	2.00×10^-4