In this study, drainage-induced
displacement grouting technology is proposed to address directional-induced grouting in saturated confined water sand layers. Based on
Darcy′s law and the law of conservation of mass, the
spatial distribution equation of the seepage pressure gradient under drainage-induced displacement grouting is deduced. The saturated sand
directional-induced grouting experiment is used to
analyze and verify the results. The results show the following. (1) Because the
grouting and drainage pressures imultaneously act on the seepage field, the
seepage pressure gradient′s space distribution curve
shows a law of decreasing first, then increasing. The directionalinduced seepage grouting can be realized when the lowest point of
the seepage pressure gradient′s spatial distribution
curve is greater than the starting gradient. (2) The theoretical derivation
formula can reflect the seepage pressure gradient distribution under drainage-induced displacement grouting to a certain extent. The theoretical
formula calculation results agree well with the model experimental results. (3)
After the seepage pressure gradient becomes stable, the error between
theoretical and experimental values is between 4.4% and 29.0%. The theoretical
calculation data are all small, and the error is acceptable. (4) The drainage-induced displacement grouting can induce the directional diffusion
of grout to a certain extent, forming the expected directional reinforcement
area in the saturated confined water sand layer. According to existing grouting
construction experiences and experimental research, the maximum spacing of
drainage-induced displacement grouting should be
controlled between 50 and 90 cm.
DENG Hongliang
,
WANG Shoufan
,
LI Xiaopeng
. Drainage-Induced Displacement Grouting
Technology in Saturated Confined Water Sand Layers[J]. Tunnel Construction, 2022
, 42(2)
: 215
-223
.
DOI: 10.3973/j.issn.2096-4498.2022.02.005
