Influence of the opening timing of recharge wells on settlement caused by dewatering in excavations

Zheng, Gang; Ha, Da; Zeng, Chao-Feng; Cheng, Xuesong; Zhou, Haizuo; Cao, Jianran

doi:10.1016/j.jhydrol.2019.03.079

Cited by 32 publications

(3 citation statements)

References 25 publications

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“…Zeng et al developed a method referred to as the combined recharge to relieve settlement during the old recharge wells rebuild [16], whereas the combined recharge may cause large amounts of soil swelling in the protected area around the top of recharged aquifer [13]. Zheng et al numerically and experimentally studied the influence of recharge opening time and recharge rate on surface settlement [17,18]. Several scholars studied recovering the groundwater level and alleviating groundwater overexploitation by recharge activities.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Zhang

Meng

et al. 2023

Sustainability

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With the excavation of a metro station in a confined water-rich stratum as our background, the sensitivity of four typical recharge parameters is analyzed by using numerical simulation. Based on the orthogonal analysis method, an optimal recharge scheme was obtained. The results show that the main influential factors of ground settlement and groundwater recovery are recharge pressure and recharge depth. The main influential factor of retaining structure deformation and influence radius of recharge is the distance between the recharge wells and the foundation pit. For the groundwater recharging of a deep excavation in the water-rich confined area of Jinan, China, the optimal effect can be achieved when setting recharge wells with a depth of 50 m arranged in a line with a spacing of 10 m at a horizontal distance of 20 m away from the retaining wall and recharge pressure is 40 kPa. With the same construction difficulty, the maximum settlement in optimized scheme decreased 71.19%, the flux of groundwater recovery increased 11.96%, the maximum horizontal displacement of the wall decreased 15.61%, and the influence radius of recharge enlarged 8.62% compared to original scheme.

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Section: Introductionmentioning

confidence: 99%

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Zhang

Meng

et al. 2023

Sustainability

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“…For decades, groundwater has been extensively exploited in aquifers for domestic, agricultural, and industrial purposes; this has necessitated subsequent artificial recharge to balance the groundwater depletion and control land subsidence [4,5]. Long-term groundwater exploitation and recharge in confined aquifers alters the piezometric and pore pressures in aquifers [6,7]. According to the effective-stress principle, aquifer systems consolidate owing to these changes in their properties, leading to land subsidence [8,9].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Groundwater-Induced Subsidence for London and Delhi Using PSInSAR

Agarwal

Kumar

Gee³

et al. 2021

Remote Sensing

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Groundwater variation can cause land-surface movement, which in turn can cause significant and recurrent harm to infrastructure and the water storage capacity of aquifers. The capital cities in the England (London) and India (Delhi) are witnessing an ever-increasing population that has resulted in excess pressure on groundwater resources. Thus, monitoring groundwater-induced land movement in both these cities is very important in terms of understanding the risk posed to assets. Here, Sentinel-1 C-band radar images and the persistent scatterer interferometric synthetic aperture radar (PSInSAR) methodology are used to study land movement for London and National Capital Territory (NCT)-Delhi from October 2016 to December 2020. The land movement velocities were found to vary between −24 and +24 mm/year for London and between −18 and +30 mm/year for NCT-Delhi. This land movement was compared with observed groundwater levels, and spatio-temporal variation of groundwater and land movement was studied in conjunction. It was broadly observed that the extraction of a large quantity of groundwater leads to land subsidence, whereas groundwater recharge leads to uplift. A mathematical model was used to quantify land subsidence/uplift which occurred due to groundwater depletion/rebound. This is the first study that compares C-band PSInSAR-derived land subsidence response to observed groundwater change for London and NCT-Delhi during this time-period. The results of this study could be helpful to examine the potential implications of ground-level movement on the resource management, safety, and economics of both these cities.

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“…groundwater pumping, oil and gas extraction) or surface loadings is a very common phenomenon. Whether it is fluid pumping or surface loadings, the consolidation is actually induced by the increase of the effective stress (Booker and Carter, 1986a, 1986b, 1987Tarn and Lu, 1991;Zhang et al, 2015;Guo et al, 2015;Zheng et al, 2016;Li et al, 2017a;Zeng et al, 2018Zeng et al, , 2019Zheng et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Semi-analytical solution to one-dimensional consolidation of viscoelastic saturated soils subject to an inner point sink

2020

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Purpose The purpose of this paper is to present a semi-analytical solution to one-dimensional (1D) consolidation induced by a constant inner point sink in viscoelastic saturated soils. Design/methodology/approach Based on the Kelvin–Voigt constitutive law and 1D consolidation equation of saturated soils subject to an inner sink, the analytical solutions of the effective stress, the pore pressure and the surface settlement in Laplace domain were derived by using Laplace transform. Then, the semi-analytical solutions of the pore pressure and the surface settlement in physical domain were obtained by implementing Laplace numerical inversion via Crump method. Findings As for the case of linear elasticity, it is shown that the simplified form of the presented solution in this study is the same as the available analytical solution in the literature. This to some degree depicts that the proposed solution in this paper is reliable. Finally, parameter studies were conducted to investigate the effects of the relevant parameters on the consolidation settlement of saturated soils. The presented solution and method are of great benefit to provide deep insights into the 1D consolidation behavior of viscoelastic saturated soils. Originality/value The presented solution and method are of great benefit to provide deep insights into the 1D consolidation behavior of viscoelastic saturated soils. Consolidation behavior of viscoelastic saturated soils could be reasonably predicted by using the proposed solution with considering variations of both flux and depth because of inner point sink.

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Influence of the opening timing of recharge wells on settlement caused by dewatering in excavations

Cited by 32 publications

References 25 publications

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Optimization of Recharge Schemes for Deep Excavation in the Confined Water-Rich Stratum

Comparative Study of Groundwater-Induced Subsidence for London and Delhi Using PSInSAR

Semi-analytical solution to one-dimensional consolidation of viscoelastic saturated soils subject to an inner point sink

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