The water and mud inrush are easily encountered during
tunneling in fault and fractured zones with rich water. To address this issue,
the hydrogeological parameters such as permeability coefficient of rock and
soil and influence radius of pumping of fault F8 in Longnan Tunnel on JiangxiShenzhen
Highspeed Railway are obtained by surface pumping
test; the comprehensive prediction method of "geological radar + TSP +
advanced drilling" is proposed to detect the fault affected area in
advance; and comprehensive treatment measures such as water separation and
pressure reduction, internal sealing and external consolidation, and safety
monitoring are adopted. The results show that: (1) The permeability coefficient
of rock and soil is 0.309 7~2.803 2 m/d, and the pumping influence radius is
247.59~763.31 m, which proves that the fault water in the tunnel has pressure
bearing property, and provides the reference for the dewatering and drainage.
(2) The comprehensive geological prediction is used to accurately detect the
tunnel face DK99 +435, and the prediction results show that the face has
entered the core area of fault F8 in advance. (3) The comprehensive treatment
measures are adopted to control the discharge of fault water; the coring rate
after grouting is 85%, and the water inflow is 0.83 L/(m·min), which indicates good grouting reinforcement effect.
MA Dong
,
YAN Su
,
WANG Wuxian
.
Construction Technology of Largescale
Waterrich Fault and Fractured Zone
in Longnan Tunnel on JiangxiShenzhen Highspeed Railway
[J]. Tunnel Construction, 2020
, 40(11)
: 1634
-1641
.
DOI: 10.3973/j.issn.2096-4498.2020.11.012
