Horizontal directional drilling model test apparatus
can provide a feasible test platform for exploring the quantitative
relationship between drilling and rock physicomechanical
parameters. In this research, a model test device that can investigate the
correlation between horizontal directional drilling parameters and rock
strength is independently developed to observe the application of horizontal
directional drilling technology in tunnel geological investigations. The device
includes drilling pressure power, rotary power, and parameter measurement
systems. The drilling pressure power and rotation power systems are driven by
positive displacement motors and hydraulic cylinders, respectively, which can
measure displacement, drilling pressure, rotational speed, torque, system water
pressure, and water flow rate. The feasibility of the test system is tested
using six mortar test blocks with a strength grade of M15, and the following
results are obtained. (1) The drilling speed of horizontal directional drilling
and the reaction torque of the bit increase with increasing drilling pressure.
(2) A positive proportional change relationship exists between the mud system circulation
pressure and the reaction torque of the bit, as well as between the mud system
circulation flow and the rotational speed of the bit. (3) The quantitative
relationship between drilling parameters and rock strength can be studied using
the test device while preserving the working characteristics of horizontal
directional drilling.
ZHANG Shengbin
,
LIU Jiguo
,
LIU Xialin
,
SHU Heng
,
CHENG Yong
,
ZHAO Qiang
,
MA Baosong
. A Model Test Device Based on Horizontal Directional
Drilling[J]. Tunnel Construction, 2023
, 43(9)
: 1455
-1462
.
DOI: 10.3973/j.issn.2096-4498.2023.09.002
