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Journal of Zhejiang University SCIENCE A 2005 Vol.6 No.3 P.188~193

http://doi.org/10.1631/jzus.2005.A0188


On the dissipation of negative excess porewater pressure induced by excavation in soft soil


Author(s):  LI Yu-qi, YING Hong-wei, XIE Kang-he

Affiliation(s):  Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   liyuqi2000@hotmail.com

Key Words:  Negative excess porewater pressure, Effective stress, Earth pressure, Excavation


LI Yu-qi, YING Hong-wei, XIE Kang-he. On the dissipation of negative excess porewater pressure induced by excavation in soft soil[J]. Journal of Zhejiang University Science A, 2005, 6(3): 188~193.

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author="LI Yu-qi, YING Hong-wei, XIE Kang-he",
journal="Journal of Zhejiang University Science A",
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pages="188~193",
year="2005",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2005.A0188"
}

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%T On the dissipation of negative excess porewater pressure induced by excavation in soft soil
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%A YING Hong-wei
%A XIE Kang-he
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2005.A0188

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T1 - On the dissipation of negative excess porewater pressure induced by excavation in soft soil
A1 - LI Yu-qi
A1 - YING Hong-wei
A1 - XIE Kang-he
J0 - Journal of Zhejiang University Science A
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SP - 188
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2005.A0188


Abstract: 
Unloading induces negative excess porewater pressure in soil mass around a foundation pit during excavation. In this work, the dissipation rule of negative excess porewater pressure after excavation was studied. Analytical formulas for calculating the negative excess porewater pressures and the effective stresses were derived based on one-dimensional consolidation theory and Terzaghi’s effective stress principle. The influence of the dissipation of negative excess porewater pressure on earth pressure inside and outside a foundation pit and the stability of the retaining structure were analyzed through a numerical example. It was indicated that the dissipation of negative excess porewater pressure is harmful to the stability of the retaining structure and that rapid construction can make full use of the negative porewater pressure.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] Chen, Y.J., Wen, Y.F., 1999. Water and earth pressures on the supporting structure around a foundation pit. Chinese Journal of Geotechnical Engineering, 21(2):139-143 (in Chinese).

[2] Gibson, R.E., England, G.L., Hussey, M.J.L., 1967. The theory of one-dimensional consolidation of saturated clays: I. Finite non-linear consolidation of thin homogeneous layers. Geotechnique, 17(2):261-273.

[3] Gibson, R.E., Schiffman, R.L., Cargill, K.W., 1981. The theory of one-dimensional consolidation of saturated clays: II. Finite non-linear consolidation of thick homogeneous layers. Canadian Geotechnical Journal, 18(2):280-293.

[4] Gray, H., 1945. Simultaneous consolidation of contiguous layers of unlike compressible soils. Trans ASCE, 110:1327-1356.

[5] Li, G.X., 2000. Estimating the water and earth pressures on the supporting structure around a foundation pit separately and together. Chinese Journal of Geotechnical Engineering, 22(3):348-352 (in Chinese).

[6] Schiffman, R.L., Stein, J.R., 1970. One-dimensional consolidation of layered systems. JSMFD, ASCE, 96(4):1499-1504.

[7] Wang, Z., Zou, W.L., Li, G.X., 2003. Earth pressure and water pressure on retaining structure. Rock and Soil Mechanics, 24(2):146-150.

[8] Xie, K.H., 1994. Theory of one dimensional consolidation of double-layered ground and its applications. Chinese Journal of Geotechnical Engineering, 16(5):24-35 (in Chinese).

[9] Xie, K.H., Xie, X.Y., Jiang, W., 2002a. A study on one-dimensional nonlinear consolidation of double-layered soil. Computer and Geotechnics, 29:151-168.

[10] Xie, K.H., Liu, C.M., Ying, H.W., Yang, W., 2002b. Analysis of settlement induced by dewatering during excavation in layered soil. Journal of Zhejiang University (Engineering Science), 36(3):239-242 (in Chinese).

[11] Yang, X.J., Gong, X.N., 1997. Calculation of earth pressure on excavation considering porewater pressure. China Civil Engineering Journal, 30(4):58-62 (in Chinese).

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