Massive water volume occurred during the excavation of
No. 4 ventilation shaft of the Tianshan Shengli tunnel, leading to the
construction stop. Considering the engineering characteristics of the large
inclination angle, small crack opening, and weak slurry intake of waterrich
marble strata, a steeply inclined marbleenhanced
permeability drainage grouting model is constructed. Then, based on the
generalized Bingham fluid constitutive equation, a diffusion transport equation
considering the rheological characteristics of marble fracture slurry is
proposed. The equation demonstrates that the inclination angle of the crack,
initial and secondary splitting pressures, crack water pressure, design
splitting diffusion distance, and timevarying
viscosity of the slurry are the key factors affecting the grouting pressure. On
this basis, key grouting parameters and construction techniques are determined,
and key technologies such as highpressure water pulse
fracturing to increase the permeability in rock fracture channels and drainage
grouting are used to achieve controlled diffusion of grout in steeply inclined
marble fracture channels. After ground pregrouting treatment, methods including
simple hydrological observation, borehole television, and fiber optic
temperature measurement are used to monitor the water blocking effect of onsite grouting. The geological exposure results demonstrate no
obvious water seepage at the excavation face of the vertical shaft, and the
water inflow of the shaft after grouting treatment remains under 1 m3/h, ensuring the safe and efficient construction of No. 4
ventilation shaft of the Tianshan Shengli tunnel. The engineering practice
shows that grouting water blocking technology based on enhanced splitting
drainage exhibits a remarkable effect, thus providing a novel idea for the
treatment of water inrush disasters in waterrich and
steep marble strata.
MAO Jinbo
,
LI Yalong
,
JI Zhongkui
,
HAN Qiang
,
ZHANG Xiaohu
,
ZHANG Binbin
,
SUN Baijun
,
ZHAO Honggang
. Grouting Technology for Steeply Inclined Marble with
Rich Water by Increasing Permeability and Drainage: A Case Study of No. 4 Ventilation Shaft of Tianshan Shengli Tunnel[J]. Tunnel Construction, 2024
, 44(2)
: 332
-340
.
DOI: 10.3973/j.issn.2096-4498.2024.02.012
