›› 2015, Vol. 36 ›› Issue (12): 3373-3380.doi: 10.16285/j.rsm.2015.12.005

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A study on grout consolidation and dissipation mechanism during shield backfilled grouting with considering time effect

LIANG Yu1, YANG Jun-sheng1, WANG Shu-ying1, ZENG Xue-yi2   

  1. 1. School of Civil Engineering, Central South University, Changsha, Hunan 410075 China; 2. Changsha Urban Investment and Construction Group, Changsha, Hunan 410000, China
  • Received:2015-05-10 Online:2015-12-11 Published:2018-06-14
  • Supported by:

    Project supported by the National Natural Science Foundation for Youths of China (Grant No. 51208516) and Exploration and Innovation Foundation for Graduate of Central South University (Grant No. 2013zzts051).

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Abstract: The water in grout will permeate toward surrounding rock due to the osmotic pressure, so that the grout itself will consolidate gradually during shield backfilled grouting; and the grouting pressure will dissipates slowly. The variation of grout viscosity will lead to a change in the permeability of soil layers during the grouting process. Based on this fact, the grout consolidation and pressure dissipation equations have been deduced; and the distribution regularities of grouting pressure acting on segments have been analyzed, which provide a guideline for fine analysis of segment mechanics during construction. The results show that: the increase of grout viscosity will result in decreases in the grout liquidity, the extent of grouting pressure dissipation and duration time of grout dissipation. The variation of grout mixing proportion and permeability coefficient of surrounding rock can also influence the extent of grouting pressure dissipation and duration time of grout dissipation.. The calculated results are consistent with the field measured results. It is suggested that the grout dissipation effect due to time-varying should be taken into account in backfilled grouting.

Key words: backfilled grouting, grout consolidation, grout pressure dissipation, grout viscosity variation

CLC Number: 

  • TU 457
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