To investigate the characteristics of crystalline
material and the effect of water environment on the drainage path of highway
tunnels and analyze the applicability of crystallization change and trend calculation
method, a case study is conducted on drainage crystallization disease of
tunnels in dolomites. The drainage path of "surrounding rock waterinitial
branch waterdrainage pipe water" is regarded as
the analysis context to comparatively analyze the variation characteristics of
crystalline mineral content, concentrations of the Eight Ions of water, and
water environment parameters in the drainage path. In addition, the variation
law of crystallization trend in the drainage path is calculated and clarified
using the DavisStiff saturation index method and
calcite saturation index method. Moreover, the applicability of the recommended
methods and the influence of main water environment parameters on the
crystallization trend are analyzed. The results reveal the following: (1) The
tunnels exhibit calcite drainage crystallization, and the content of calcite in
the drainage path increases sharply. The calcites account for 0.6% and 15% of
the surrounding rock 〖HJ2.4mm〗and
primary support shotcrete, respectively. (2) The primary support shotcrete
significantly affect the water environment parameters in the drainage path. It
dramatically increases the concentrations of Ca2+ ions, CO2－3
ions, and pH value and sharply decreases the concentration of HCO－3 ions. Salinity, total dissolved solids, and conductivity exhibit
an increasing trend. (3) The drainage path initially exhibits an increasing
crystallization trend and then stabilizes. The influence of Ca2+ ion and CO2－3 ion concentrations on the saturation trend is greater than that of
the temperature 〖WT《TNR#I》〗t〖WT《TNR》〗 and pH value. (4) The calculation results of the crystallization
trend of the calcite saturation index method are consistent with the actual
situation. Thus, the findings show that the proposed method is suitable for
analyzing the crystallization trend of the tunnel water environment in
dolomite.
ZHUANG Chaohui
,
LIU Yuyang
,
XI Longlong
,
ZHOU Xuan
,
TANG Jiuke
.
Crystallization Trend Change and Influencing Factors
of Tunnel
Drainage Path in Dolomite
[J]. Tunnel Construction, 2023
, 43(4)
: 618
-624
.
DOI: 10.3973/j.issn.2096-4498.2023.04.008
