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

Wu, Ya‐Fen; Shen, Shui‐Long; Wu, Huai-Na; Xu, Ye‐Shuang; Yin, Zhen‐Yu; Sun, Wenjuan

doi:10.1016/j.enggeo.2015.06.015

Cited by 60 publications

(17 citation statements)

References 45 publications

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“…The remaining bedrock is primarily covered by Quaternary sediments and is also partially covered by Tertiary deposits 300 m in thickness. The foundation-bearing soil strata and underground construction depths are generally within a 100 m depth [11,13]. The presence of these underground structures will change the hydrogeological characteristics of the strata and aquifers.…”

Section: Introductionmentioning

confidence: 99%

“…Urbanization seriously affects the natural environment, not only in terms of environmental pollution, but also in the deterioration of the geological environment, which can induce geohazards. As depicted in Figure 1, the multi-aquifer-aquitard groundwater system (MAAS) in Shanghai consists of a phreatic aquifer group (Aq0) and five confined aquifers (AqI-AqV), which are divided by six aquitards (AdI-AdVI) [11][12][13]. The phreatic aquifer group, Aq0, has two secondary types: one is the phreatic aquifer (Aq01) and the other one is the artesian aquifer (Aq02).…”

Section: Introductionmentioning

confidence: 99%

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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of Shanghai, land subsidence has accelerated, and the groundwater level has continued to drop even though the net withdrawn volume (NWV) of groundwater has remained unchanged since 1980.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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ren

2016

Sustainability

Self Cite

135

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“…The karst development is mainly controlled by the solubility of rocks, geological structures (including rock strata, faults, fissures, etc. ), and groundwater [20][21][22][23][24][25]. Among them, the fluidity of water is the most active factor.…”

Section: Karst Development Conditions and Mechanism Along The Jinan Mmentioning

confidence: 99%

Karst Development Mechanism and Characteristics Based on Comprehensive Exploration along Jinan Metro, China

Sun

Jing

et al. 2018

Sustainability

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Jinan is the capital of Shandong Province and is famous for its spring water. Water conservation has become the consensus of Jinan citizens and the government and the community. The construction of metro engineering in Jinan has lagged behind other cities of the same scale for a long time. The key issue is the protection of spring water. When metro lines are constructed in Jinan karst area, the water-inrushing, quicksand, and piping hazards can easily occur, which can change the groundwater seepage environment and reduce spring discharge. Therefore, we try to reveal the development conditions, mechanism, and mode of karst area in Jinan. In addition, we propose the comprehensive optimizing method of "shallow-deep" and "region-target" suitable for exploration of karst areas along Jinan metro, and systematically study the development characteristics of the karst areas along Jinan metro, thus providing the basis for the shield tunnel to go through karst areas safely and protecting the springs in Jinan.

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“…The piezometric level of this confined aquifer is close to the ground surface. Additionally, in the hilly region, the bedrock fissure water widely distributed across an area of 743.3 km 2 usually has a very high piezometric level [52][53][54][55][56][57]. It is worth noting that the well-developed river network combined with the high precipitation provides abundant water resources that may worsen the geological conditions during shield tunneling [58][59][60][61][62][63][64][65][66].…”

Section: Hydrogeology and Engineering Geology Of Guangzhoumentioning

confidence: 99%

Fractal Prediction of Grouting Volume for Treating Karst Caverns along a Shield Tunneling Alignment

et al. 2017

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Karst geology is common in China, and buried karst formations are widely distributed in Guangdong province. In the process of shield tunneling, the abundant water resources present in karst caverns could lead to the potential for high water ingress, and a subsequent in situ stress change-induced stratum collapse. The development and distribution of karst caverns should therefore be identified and investigated prior to shield tunnel construction. Grouting is an efficient measure to stabilize karst caverns. The total volume of karst caverns along the shield tunneling alignment, and its relationship with the required volume of grouts, should be evaluated in the preliminary design phase. Conventionally, the total volume of karst caverns is empirically estimated based on limited geological drilling hole data; however, accurate results are rarely obtained. This study investigates the hydrogeology and engineering geology of Guangzhou, the capital of Guangdong province, and determines the fractal characteristics of the karst caverns along the tunnel section of Guangzhou metro line no. 9. The karst grouting coefficients (V R ) were found to vary from 0.11 in the case of inadequate drilling holes to 1.1 in the case where adequate drilling holes are provided. A grouting design guideline was furthermore developed in this study for future projects in karst areas.

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

Cited by 60 publications

References 45 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

Karst Development Mechanism and Characteristics Based on Comprehensive Exploration along Jinan Metro, China

Fractal Prediction of Grouting Volume for Treating Karst Caverns along a Shield Tunneling Alignment

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