Model test on partial expansion in stratified subsidence during foundation pit dewatering

Wang, Jianxiu; Deng, Yansheng; Ma, Ruiqiang; Liu, Xiaotian; Guo, Qingfeng; Shao-li, Liu; Shao, Yule; Wu, Linbo; Zhou, Jie; Yang, Tianliang; Wang, Hanmei; Huang, Xinlei

doi:10.1016/j.jhydrol.2017.12.046

Cited by 50 publications

(10 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Corresponding to the change in the pore water pressure, the upper soil units are vertically in tension rather than compaction, exhibiting that the vertical displacement at a lower position is greater than that at an upper position. This phenomenon has been observed in the field tests (Wang et al ; Zhu et al ).…”

Section: Distribution Characteristics Of Displacement and The Pore Wasupporting

confidence: 58%

Three‐Dimensional Numerical Investigation of Pore Water Pressure and Deformation of Pumped Aquifer Systems

Yun¹,

Yan

Yang

et al. 2019

Groundwater

Self Cite

View full text Add to dashboard Cite

Excessive groundwater withdrawal has caused severe land subsidence worldwide. The pore water pressure and the deformation of pumped hydrostratigraphic units are complex. A fully coupled three‐dimensional numerical simulation was carried out for different pumping plans in this paper. When groundwater is pumped from a confined aquifer, the great compaction occurs in the pumped aquifer and its upper and lower adjacent aquitard units. Land subsidence is smaller and the area affected by land subsidence is greater when groundwater is pumped from the deeper confined aquifer. The pore water pressure in the pumped confined aquifer changes immediately with pumpage. In the adjacent aquitard units, however, the pore water pressure increases in the early pumping time and decreases in the early recharging time. The decrease in the pore water pressure vertically spreads from the interface between aquitard and pumped aquifer to the other surface of the aquitard. The pumped aquifer compacts and rebounds immediately with pumping and non‐pumping or recharging actions, while the compaction and rebounding of the aquitard units clearly lag behind. The compaction of the adjacent aquitard unit first occurs near the interface between aquitard and pumped aquifer units, and the compaction zone spreads outward as the pumping goes on. The aquitards may expand vertically within some zones. Due to the inelastic deformation of soil skeleton, different pumping plans result in different land subsidence. For the same net pumpage, maximal land subsidence and horizontal displacement are the smallest for constant discharge and the greatest for recharge‐discharge cycle.

show abstract

Section: Distribution Characteristics Of Displacement and The Pore Wasupporting

confidence: 58%

Three‐Dimensional Numerical Investigation of Pore Water Pressure and Deformation of Pumped Aquifer Systems

Yun¹,

Yan

Yang

et al. 2019

Groundwater

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the mechanism of land subsidence has not yet been comprehensively understood. Laboratory model tests were often used to do researches on the mechanisms, in which groundwater withdrawal was represented by such equivalent methods as lowering and raising the water level in sand layers (Murayama, 1969;Li et al, 2014;Lv et al, 2011;Wang et al, 2018). These methods were different from the real pumping.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on mechanism for pumping-induced land subsidence

Zhang

et al. 2020

Proc. IAHS

Self Cite

View full text Add to dashboard Cite

Groundwater pumping can cause severe land subsidence, yet the mechanisms have not been completely clear. A laboratory physical model test was done to investigate the mechanism for pumping-induced land subsidence. In the model test, a model well was installed and pumpage through the well was taken. During and after pumping, the soil displacement and the pore water pressure were documented. The pore water pressure within the pumped sand layer decreased immediately after pumping and recovered immediately after stopping pumping, while the pore water pressure in the neighboring silty clay layers first increased and then decreased with pumping, and first decreased and then increased after pumping was stopped and groundwater level in the sand layer recovered. The duration within which the pore water pressure in the silty clay increased when pumping was increasingly great with the distance from the pumped sand layer. The compaction of the neighboring silty clay first occurred near the interface between the silty and sand layers, and the silty clay expanded vertically within some zones. The test results indicate that the mechanism for land subsidence is complex. Due to their low permeability, aquitard units may expand in a period when groundwater is withdrawn from the neighboring aquifer units, and they may compact when groundwater is recharged into the neighboring aquifer units. This is one of the reasons for the lagging compaction of aquitard units.

show abstract

“…The load of new built-up areas and engineering works induce shallow subsurface consolidation, which act also over long periods. Although land subsidence caused by new urbanization significantly threats the safety of population, stability of infrastructures (Tosi et al, 2012;Minderhoud et al, 2018;Wang et al, 2018) and (local) economies, the current state of scientific knowledge is insufficient to cope this critical issue.…”

mentioning

confidence: 99%

Advances and Practices on the Research, Prevention and Control of Land Subsidence in Coastal Cities

Yan

Yang

et al. 2020

Acta Geologica Sinica (Eng)

Self Cite

View full text Add to dashboard Cite

Land subsidence severely threatens most of the coastal plains around the world where high productive industrial and agricultural activities and urban centers are concentrated. Coastal subsidence damages infrastructures and exacerbates the effect of the sea‐level rise at regional scale. Although it is a well‐known process, there is still much more to be improved on the monitoring, mapping and modeling of ground movements, as well as the understanding of controlling mechanisms. The International Geoscience Programme recently approved an international project (IGCP 663) aiming to bring together worldwide researchers to share expertise on subsidence processes typically occurring in coastal areas and cities, including basic research, monitoring and observation, modelling and management. In this paper, we provide the research communities and potential stakeholders with the basic information to join the participating teams in developing this project. Specifically, major advances on coastal subsidence studies and information on well‐known and new case studies of land subsidence in China, Italy, The Netherlands, Indonesia, Vietnam and Thailand are highlighted and summarized. Meanwhile, the networking, dissemination, annual meeting and field trip are briefly introduced.

show abstract

Model test on partial expansion in stratified subsidence during foundation pit dewatering

Cited by 50 publications

References 35 publications

Three‐Dimensional Numerical Investigation of Pore Water Pressure and Deformation of Pumped Aquifer Systems

Three‐Dimensional Numerical Investigation of Pore Water Pressure and Deformation of Pumped Aquifer Systems

Experimental study on mechanism for pumping-induced land subsidence

Advances and Practices on the Research, Prevention and Control of Land Subsidence in Coastal Cities

Contact Info

Product

Resources

About