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Land subsidence prediction for a new urban mass rapid transit line in Hanoi

Underground Space 2020年第2期5卷 93-104页

作者： Pham Huy Giao Vu Thi Hue Nguyen Dang Han Nguyen Thi Hai Anh Nguyen Ngoc Minh Asian Institute of Technology BangkokThailand Institute of Foundation and Underground FECONHanoiViet Nam Sonhai JSC Viet Nam

The rapidly increasing population,urbanization,and industrialization of Hanoi city in the last few decades have necessitated the urgent development of a new underground public transport infrastructure such as the urban mass rapid transit(UMRT)system that is now under ***,concerns on the possible effects of land subsidence on the to-be-constructed and operated UMRT lines must be *** of the difficulties while assessing land subsidence in Hanoi is the insufficient subsidence monitoring ***,a good geotechnical characterization of the subsoil profile and proper numerical analysis can help predict groundwater pumping-induced subsidence *** UMRT line No.2 that was selected for this study is special as it runs across the old quarter downtown,located at the very heart of Hanoi *** this paper,the Hanoi aquifer system,groundwater extraction,and subsidence monitoring network of Hanoi are reviewed *** data from 30 investigation boreholes were analyzed to characterize the subsoil profile underlying a segment of the UMRT line No.2 that consists of both elevated and underground *** soil layers were identified up to a depth of 50 m,including a compressible soft clay layer 10-15 m thick that is supposed to be most vulnerable to subsidence by groundwater *** on the long-term groundwater monitoring data,one-dimensional finite element method(FEM)consolidation analyses were carried out for three drawdown boundary conditions of 5,10,and 15 m and yielded a total subsidence of 0.15,0.35,and 0.5 m,respectively,after 25 years with 1994 as the reference *** results of this study confirmed that land subsidence in particular should be considered in the construction and maintenance of the UMRT lines in Hanoi,in particular for underground sections that are founded on soft to medium clay layers.

关键词： Hanoi aquifer system groundwater pumping Land subsidence UMRT line Geotechnical characterization

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Numerical Evaluation of Land Subsidence Induced by Dewatering in Deep Foundation Pit

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Journal of Shanghai Jiaotong university(Science) 2013年第3期18卷 278-283页

作者：张冬冬宋春雨陈龙珠 Institute of Engineering Safety and Disaster Prevention School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University

To predict the behavior of land subsidence due to groundwater withdrawal, a 3D numerical model is established. The model takes the confined aquifer and soft deposit of Ningbo into account. According to the pumping test data, changing regulations of groundwater level, and land subsidence during dewatering are analyzed. Comparison between the calculated value and measured value shows that the 3D model simulates the measured value fairly well. The future behavior of land subsidence during dewatering period provides the scientific basis for the construction of deep foundation.

关键词： deep foundation pit groundwater pumping 3D seepage land subsidence

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Determining safe yield and mapping water level zoning in groundwater resources of the Neishabour Plain

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Journal of groundwater Science and Engineering 2023年第1期11卷 47-54页

作者： Parisa Kazerani Ali Naghi Ziaei Kamran Davari Faculty of Agriculture Ferdowsi University of MashhadKhorasan RazaviIran the Water Science and Engineering Department Faculty of AgricultureFerdowsi University of MashhadKhorasan RazaviIran the Water Engineering Department Faculty of AgricultureFerdowsi University of MashhadKhorasan RazaviIran

groundwater is a crucial sources of water supply,especially in arid and semi-arid areas around the *** uncontrolled withdrawals and limited availability of these resources,it is essential to determine the safe yield of these valuable *** Hill method approach was used in this study to determine the safe yield the Neishabour aquifer in Khorasan Razvi province in *** results showed that the safe yield in the Neishabour aquifer is 60%lower than the current pumping amounts during the study period,indicating that further overdrafts could result in the destruction of this *** highlights the importance of using the Hill method to estimate the permitted exploitation from other aquifers,thus preventing problems caused by over-extraction and maintaining stability of global groundwater levels.

关键词： Hill method Water level zoning maps groundwater pumping Safe yield groundwater crisis

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