The challenges posed by
significant deformation of surrounding rock masses induced by excavation and
the dynamic failure triggered by strong impacts are becoming increasingly
severe as deep rock engineering advances. Rockburst, a common dynamic hazard in
deep underground engineering, is referred to as the "cancer" of the
geotechnical engineering community because of its suddenness. This
characteristic makes effective prediction and prevention difficult, thus
seriously endangering the safety of construction personnel and the normal
operation of equipment. In this study, the authors explore the mechanism of
excess energy in rockburst by comparing the energy storage differences of rocks
under true triaxial unloading and uniaxial compression stress paths. Rockbursts
are categorized into strainburst and disturbanceinduced impact rockbursts on the basis of different mechanisms of
rockburst initiation. To simulate the stress paths of different types of
rockbursts induced by excavation and reproduce various rockburst phenomena
indoors for mechanism research, the authors′ team
independently developed three sets of true triaxial rockburst simulation
experimental systems. They are 1-G strainburst, 2-G strainburst, and impact rockburst experimental systems. Different
types of rockbursts were successfully simulated in the laboratory. The authors
include roadway strainbursts, roadway intersection strainbursts, strainbursts
of three free face pillars, strainbursts of pillars, and impact rockbursts
induced by dynamic loads. The authors propose an excavation compensation method
and develope macroscopic and microscopic anchors/cables with negative Poisson′s ratio(NPR) effects to effectively control rockburst disasters.
Engineering practice has proven that NPR anchors/cables can provide high
prestress to compensate for stress loss caused by excavation. Moreover, they
possess good ductility and energy absorption effects. As a result, NPR
anchors/cables offer an effective approach for the prevention and control of
rockburst disasters.
HE Manchao
,
LI Jieyu
,
LIU Dongqiao
,
TAO Zhigang
,
HU Jie
,
WANG Jiong
. Rockburst Mechanism and Control[J]. Tunnel Construction, 2024
, 44(7)
: 1321
-1336
.
DOI: 10.3973/j.issn.2096-4498.2024.07.001