Chemical Groutingby Raymond W. Henn,
Chemical grouting is used in underground construction primarily on soft-ground shafts and tunnels in an effort to control cohesionless or running ground conditions by modifying the soil. Chemical grouting involves the injection of a two-part grouting system usually using sodium silicate-based grout, which is injected into the soil mass for the purpose of inreasing the soil's cohesive strength, thereby increasing the stand-up time of the excavated face. This chapter discusses the applications of chemical grouting in underground construction, followed by sections on the types of chemical grout, the equipment used to batch and inject chemical grout, the design of the chemical grouting program, and two case histories, one involving grouting from the surface and the other involving grouting from the tunnel working face.
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