Change of Soil Stress State around Foundation Pit due to Dewatering

Abstract:

Engineering dewatering has been widely used to improve soil characteristics currently, whereas dewatering always bring about soil settlement around the pumping well inevitably, which may be the largest defect of dewatering. In this paper, several possible factors leading to soil subsidence are explored, then the change of soil stress under the action of dewatering drainage during phreatic aquifer well pumping are investigated. From the two aspects that may be encountered during dewatering in confined aquifer: only pressure lowering effect as well as simultaneous function of both pressure relief and dewatering drainage, we study the change of soil stress state around foundation pit. The conclusions obtained through this research will contribute much to the calculation of soil settlement caused by dewatering, also beneficial to seek the settlement control measures.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 604-607
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.604
• Online since: November 2012
• Authors: Hua Yuan, Yan Hong
• Keywords: Dewatering, Drainage Effect, Drawdown Funnel Curve, Foundation Pit, Free Flow, Stress State

References

[1] Y.Q. Wu, J.S. Zhang, Z. Li: Rock and Soil Mechanics. Vol 26(10) (2005), p.1582, In Chinese.

[2] C.Y. Wang, L.X. Huang, W.C. Duan, et al: Rock and Soil Mechanics. Vol 27(6) (2006), p.1011, In Chinese.

[3] H. Yuan: Deformation of Foundation Pit induced by Dewatering and its Control in Soft Soil Area, Ph D Thesis, Tongji University (2010), In Chinese.

[4] Y.Q. Xue: Principle of Groundwater Dynamics, Geological Press (1986), In Chinese.

[5] L.G. Wu: Design and Excavation of Dewatering & Theory of Seepage in Deep Excavation, China Communications Press, Beijing (2003), In Chinese.