Against the current status for the loess tunnel with saturated loess around the rock in the gate of loess tunnel that the strength of surrounding rock is low and the ability in self-support is bad and the construction is very difficult, on the basis of measuring the gelation time of cement-silicate grout and compression strength of grout binder at different mixture ratio and temperature in the laboratory, authors research the technical parameters by the field grouting test, such as mixture ratio, grouting pressure, diffusion radius of grout and grouting technology. The results show that parameters of cement-silicate double solution grouting are suggested as follows, at the construction of loess tunnel: silicate modulus M=2.8~3.1; silicate liquor strength Be′=35~40; water-cement ratio W/C=0.75:1~1.0:1(ratio by weight); cement-silicate ratio is 1:0.5~1:1.0(ratio by volume);grouting pressure is 0.6~3.5 MPa;diffusion radius of grout is 0.5~1.3 m. The engineer practice shows that the method of cement-silicate grouting can be achieved good effect for reinforcing the saturated loess in the gate of loess tunnel.
YANG Xiao-hua, YU Yong-hua.
Application of cement-silicate double solution grouting in loess tunnel construction[J]. China Journal of Highway and Transport, 2004, 17(2): 68-72
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