Laboratory model tests on effect of overlying load on long-term effectiveness of grouting uplift in soft clay

被引：0
|
作者：
Zheng G. [1 ,2 ]
Zhang X.-S. [1 ,2 ]
机构：
[1] MOE Key Laboratory of Coastal Civil Engineering Structures and Safety, Tianjin
[2] School of Civil Engineering, Tianjin University, Tianjin
来源：
| 1600年 / Chinese Society of Civil Engineering卷 / 38期
关键词：
Compensation grouting; Interval time; Over-consolidation ratio; Overlying load; Reinforcement;
D O I：
10.11779/CJGE201606001
中图分类号：
学科分类号：
摘要：
A series of laboratory grouting tests are performed to study the change rules of the long-term effectiveness of grouting uplift under various overlying loads by using a set of grouting experimental setup. The effects of interval time, overconsolidation ratio and reinforcement measures of soft clay on the long-term efficiency of grouting uplift under various overlying loads are also studied. The results show that the final compensation grouting efficiency of normally consolidated soils decreases with the increase of overlying load. The peak grouting pressure increases linearly with the increase of overlying load. When the total grouting volume is the same and regrouting is conducted, the single injection with large injection volume results in the best final compensation grouting efficiency under small overlying load, whereas the final compensation grouting efficiency of single injection is less than that of regrouting under large overlying load. In addition, the larger the interval time, the lower the final compensation grouting efficiency when the overlying load is the same. For the over-consolidated soil, the efficiency of grouting uplift is significant and the final compensation grouting efficiency increases with the increase of over-consolidation ratio. The final compensation grouting efficiency almost has little change with the increase of the overlying load when the overlying load is larger than 75 kPa or the over-consolidation ratio is equal to 2.0. The reinforcement measures can significantly increase the final compensation grouting efficiency and the effect of grouting uplift is obvious. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：969 / 977
页数：8
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共 20 条
  • [1] Peck R.B., Deep excavation and tunneling in soft ground, Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, pp. 225-290, (1969)
  • [2] Cording E.J., Hansmire W.H., Displacements around soft ground tunnels, 5th Pan American Conference on Soil Mechanics and Foundation Engineering, pp. 571-632, (1975)
  • [3] Attewell P.B., Yeates J., Selby A.R., Soil Movement Induced by Tunneling and their Effects on Pipelines and Structures, (1986)
  • [4] Zhang X.-L., Zhang D.-L., Wang M.-S., Determination of proper position of grouting during lifting the existing subway, Chinese Journal of Geotechnical Engineering, 30, 5, pp. 712-717, (2008)
  • [5] Mair R.J., Rankin W.J., Essler, Et al., Compensation grouting, World Tunnelling and Subsurface Excavation, 7, 1, pp. 39-41, (1997)
  • [6] Scheweiger H.F., Kummerer C., Numerical modeling of settlement compensation by means of fracture grouting, Soils and Foundations, 44, 1, pp. 71-86, (2004)
  • [7] Wisser C., Augarde C.E., Burd H.J., Numerical modeling of compensation grouting above shallow tunnels, International Journal for Numerical and Analytical Methods in Geomechanics, 29, pp. 443-471, (2005)
  • [8] Tang Z.-W., Zhao C.-G., Zhang D.-L., Design of displacement grouting and prediction of the effect for construction of underground structures, China Civil Engineering Journal, 40, 8, pp. 79-84, (2007)
  • [9] Sun F., Zhang D.-L., Wang C., Analysis of raising pipeline by fracture grouting and its application, Rock and Soil Mechanics, 31, 3, pp. 932-938, (2010)
  • [10] Au S.K.A., Soga K., Jafari M.R., Factors affecting long-term efficiency of compensation grouting in clays, Journal of Geotechnical and Geoenvironmental Engineering, 129, 3, pp. 254-262, (2003)
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