The Layue tunnel of the SichuanTibet
railway is influenced by geothermal heat. Thus, geothermal and geological
structure surveys, borehole explorations, and temperature measurements are
conducted to obtain the optimal tunnel route and to avoid hightemperature hazards. Then, the distributions of the geotherm and
geothermal gradient are determined. By analyzing the influence of groundwater
upon the geotherm, the principles of line selection are determined. The
geothermal test data and geothermal curves show that: (1) High geotherms are a
common hazard in the test area and the maximum measured geotherm and geothermal
gradient are 93.5 ℃ and 40 ℃/100
m, respectively; (2) Obvious stratification characteristics exist in the
vertical direction of the geothermal gradient, and the difference in this plane
is closely related to the structure, topographic cutting, and elevation. Based
on 〖JP+1〗this analysis, it is
recommended that the line should be built far away from the Yarlung Zangbo
River suture zone, and that the altitude of the line should be elevated to
reduce hightemperature hazards. According to the
established geothermcalculation formula based on
constanttemperature surface, constanttemperature layer thickness and geothermal gradient, it is predicted
that there might be a section with a severe geotherm above 60 ℃ in Layue tunnel.
WANG Shengren
,
ZHANG Xiaoyu
,
DU Shihui
,
QI Jihong
,
ZHANG Wenzhong
,
HUANG Yong
,
CHANG Shuaipeng
. Geothermal Distribution Characteristics and Prediction
of Layue Tunnel of SichuanTibet
Railway Passing through East Syntaxis[J]. Tunnel Construction, 0
: 100
-107
.
DOI: 10.3973/j.issn.2096-4498.2021.01.011
