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Abstract Because of the complicated geological condition and especial water condition，the simplex grouting scheme and material can not arrive at the perfect effect，and the composite grouting technique is introduced，which can take advantage of different grouting technologies and materials. The composite grouting is an economic and effective measure to strengthen the weathered slot to the full extent，which means that grouting in the ground by using different grouting technologies and materials can solve the problems of permeability，strength and stability of the surrounding rock during tunnel excavation according to a special time and space sequence. Based on the characteristic of strong weathered granite stratum，the composite grouting process is simulated by particle flow code(PFC). Then，the composite grouting mechanism is revealed and several grouting reinforcement schemes are proposed. Combining the successful application of composite grouting to weathered slot F1 of Xiamen subsea tunnel，the key technique and evaluation indices of composite grouting for water blockage in weathered slot of subsea tunnel are presented，so as to provide references and guidelines for the engineerings of passing through unfavorable geologic bodies during subsea tunnel construction.
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Received: 15 September 2011
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2012, Vol. 31 
