The calculation principles
in the measurement of in-situ
stresses using the horizontal drilling hydraulic fracturing method are
undefined. Therefore, a case study is conducted on a horizontal directional
drilling survey project of the Tianshan Shengli tunnel. A theoretical model for
the three-dimensional stress state of the surrounding
rocks in horizontal boreholes is established on the basis of the native fissure
and intersecting porous methods, and its controlling boundary conditions and
computational methodologies are investigated. Subsequently, the rationality of
the theoretical model is validated through comparative analysis with data from
indoor physical model experiments. Finally, a finite element model for stress
measurement using hydraulic fracturing in horizontal boreholes is constructed,
and its feasibility is validated through comparative analyses of numerical
simulations, theoretical calculations, and indoor experimental results. The
findings are as follows: (1) The calculated results of the theoretical model
closely align with the recorded data from the indoor physical model
experiments, with a maximum discrepancy of 6.8%,
indicating that the theoretical model for the stress state of surrounding rocks
in horizontal boreholes, constructed by integrating the native fissure method
and intersecting porous method, is applicable for stress calculations using
hydraulic fracturing in surveys based on horizontal directional drilling. (2)
The results of numerical simulations closely resemble the experimental records,
with a maximum deviation of 9.51%, indicating that the
use of the Abaqus extended finite element method combined with embedded
cohesive elements can effectively simulate the measurement of stress induced by
hydraulic fracturing in real horizontal boreholes. (3) The consistency between
the calculated results of the theoretical model and numerical simulations is
satisfactory, with the maximum error falling within an acceptable range. This
validates the correctness, accuracy, and reliability of both the theoretical
model and finite element simulation method.
LIU Xialin
,
WANG Zhen
,
HE Zhijian
. Numerical Simulation
Analysis of In-Situ Stress Measurement Using Hydraulic Fracturing During Horizontal Directional Drilling[J]. Tunnel Construction, 2024
, 44(10)
: 2049
-2057
.
DOI: 10.3973/j.issn.2096-4498.2024.10.013
