A Non-Pressurized Grouting Method using Clay for Controlling Groundwater

Generally, clay is not applied to the pressurized injection by a grouting pump, because of clay's weakness and instability as a grouting material. However, it is conversely possible to reduce permeability of extensive rock mass by pouring dilute clayey water into the rock for a long time, because clay has non-hardening characteristic. Authors developed a non-pressurized clay grouting method by using the above-mentioned characteristics and applied this to the construction of underground oil storage caverns. Outline of clay grouting and results are described in this paper.