Evaluation of the blocking effect of retaining walls on groundwater seepage in aquifers with different insertion depths

Xu, Ye‐Shuang; Shen, Shui-Long; Ma, Lei; Sun, Wenjuan; Yin, Zhen‐Yu

doi:10.1016/j.enggeo.2014.08.023

Cited by 124 publications

(44 citation statements)

References 41 publications

(57 reference statements)

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“…Also, because of existing underground structures, groundwater in a hydrostatic pressure condition may change into a condition with an unsteady downward flow. Because of the cut-off effect of underground works, the steady flow in aquifers changes into turbulent flow, which makes the groundwater head around the bottom of underground structures lower than that around the top [41][42][43].…”

Section: Long-term Drawdown Of Groundwatermentioning

confidence: 99%

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Ren

2016

Sustainability

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135

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Abstract:It has been observed that in the urban center of Shanghai, land subsidence has accelerated, and the groundwater level has continued to drop even though the net withdrawn volume (NWV) of groundwater has remained unchanged since 1980. An analysis of monitoring data shows that drawdown of the groundwater level is one of the factors that have influenced land subsidence since 1980. The NWV of groundwater in urban areas, however, is not the critical factor controlling the drawdown of the groundwater level. Since the 1980s, there have been many underground works constructed in the unique strata of Shanghai, which has an interlayered structure known as a multi-aquifer-aquitard system (MAAS). Investigation into land subsidence caused by urban construction is now receiving much attention. Based on the principle of a strategic environmental assessment (SEA) for sustainable urban development, this paper presents a discussion and analysis of the factors which can influence the development of land subsidence during continued urbanization in Shanghai. The main factors include the additional loading caused by the construction of structures, the cut-off effect due to construction in aquifers, the drawdown of groundwater level caused by leakage into underground structures, and the decrease of groundwater recharge from neighboring zones. SEA is recommended for the future development of Shanghai.

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Section: Long-term Drawdown Of Groundwatermentioning

confidence: 99%

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Ren

2016

Sustainability

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135

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“…The dewatering-retaining systems employed in Shanghai can be divided into the following five patterns, according to the insertion depth of the retaining wall into an aquifer (Wu, 2003;Xu et al, 2014): i) Pattern 1: the retaining walls are shallowly buried in AdI and the wells are set in the foundation pit to drain the phreatic water; ii) Pattern 2: the retaining wall extends into AdI and the thickness between the base of the foundation pit and the top of Aq I is small. Some wells are set in the pit to drain the phreatic water, and others are set outside the pit to lower the groundwater head of AqI; iii) Pattern 3: the retaining wall enters the upper part of AqI, and wells are set both inside and outside the pit; iv) Pattern 4: the retaining wall extends almost fully into of AqI, and wells are set within the foundation pit to withdraw the phreatic water as well as the confined water; and v) Pattern 5: the retaining wall cuts off AqI completely, and wells are set within the foundation pit to withdraw both phreatic water and confined water.…”

Section: Introductionmentioning

confidence: 99%

Environmental protection using dewatering technology in a deep confined aquifer beneath a shallow aquifer

Shen

et al. 2015

Engineering Geology

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“…The application of diaphragm walls is limited because of high project costs and engineering difficulties. However, several researchers have adopted this measure in the projects with shallow groundwater level for controlling the water influx into the foundation pit [9][10][11][12]. The second measure of installing pumping wells has been widely used to lower the groundwater table in open pits [13][14][15], and this measure has often been used in conjunction with a diaphragm wall.…”

Section: Introductionmentioning

confidence: 99%

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

et al. 2019

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This study investigates a large deep foundation pit of a hydraulic structure rehabilitation program across the Indus river, in the Punjab province of Pakistan. The total area of the construction site was 195,040 m 2 . Two methods, constant head permeability test and Kozeny-Carman equation, were used to determine the hydraulic conductivity of riverbed strata, and numerical simulations using the three-dimensional finite-difference method were carried out. The simulations first used hydraulic conductivity parameters obtained by laboratory tests, which were revised during model calibration. Subsequently, the calibrated model was simulated by different aquifer hydraulic conductivity values to analyze its impact on the dewatering system. The hydraulic barrier function of an underground diaphragm wall was evaluated at five different depths: 0, 3, 6, 9, and 18 m below the riverbed level. The model results indicated that the aquifer drawdown decreases with the increase in depth of the underground diaphragm wall. An optimal design depth for the design of the dewatering system may be attained when it increases to 9 m below the riverbed level.

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Evaluation of the blocking effect of retaining walls on groundwater seepage in aquifers with different insertion depths

Cited by 124 publications

References 41 publications

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Environmental protection using dewatering technology in a deep confined aquifer beneath a shallow aquifer

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

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