US 11,634,987 B2Granted

Safety early warning method and device for full-section tunneling of tunnel featuring dynamic water and weak surrounding rock

AssigneeInstitute of Rock and Soil Mechanics, Chinese Academy of Sciences

InventorsHongming Luo, Jun Gao, Shanxiong Chen, Xiao Lin, Lingfa Jiang, Liyun Yang, Min Chen, Yu Tang, Dean Liu, Sheng Wang, Xuejun Peng, Wenguo Yang, Xiaobo Xie, Xingli Li, Dexing Wu, Xiaozhen Xiang

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Abstract

A safe early warning method and device for full-section tunneling of a tunnel featuring dynamic water and weak surrounding rock, comprising establishing a dynamic coordinate system with an origin thereof moving along a tunnel excavation line, recording the moving distance of the origin, conducting three-dimensional laser scanning with the origin as a center to obtain point cloud data including coordinate data, collecting surrounding rock data; conducting deformation fitting on the point cloud data, calculating a fitting residual error, removing a noisy point, and conducting preprocessing; combining data of preprocessed point cloud, surrounding rock, and the tunnel excavation line to construct a tunnel excavation dynamic model; conducting stress analysis according to the model and determining whether to send out a safety early warning signal. The device comprises a three-dimensional laser scanner, a geological radar device, a displacement module, an industrial computer, a data transmission module, an alarm, and a server.

Claims9

Dependent claims

A safety early warning method for full-section tunneling of a tunnel featuring dynamic water and weak surrounding rock, comprising:

S100, establishing a dynamic coordinate system, moving an origin of the dynamic coordinate system along a tunnel excavation line as tunnel excavation construction progresses, recording a distance of movement of the origin, conducting a three-dimensional laser scanning in real-time with the origin as a center to obtain point cloud data which include coordinate data, and collecting surrounding rock data in real-time;
S200, preprocessing the point cloud data, then conducting deformation fitting, calculating a fitting residual error, and removing a noisy point by taking a set multiple of the fitting residual error deviating from its mean value as a noisy point criterion;
S300, combining the preprocessed point cloud data, surrounding rock data, and the tunnel excavation line to construct a tunnel excavation dynamic model;
and
S400, conducting stress analysis according to the tunnel excavation dynamic model, and determining whether to send out a safety early warning signal according to results of the stress analysis, wherein the stress analysis is conducted as follows:
calculating stress components of a tunnel section in all directions by the following formula:
σx=2 Re[f(x+yi)]−Re[(x−yi)f(x+yi)+w(x+yi)]
σy=2 Re[f(x+yi)]+Re[(x−yi)f(x+yi)+w(x+yi)]
σxy=Im[(x−yi)f(x+yi)+w(x+yi)]
wherein σx indicates a stress component in a horizontal direction, σy indicates a stress component in a vertical direction, σxy indicates a stress component in a 45-degree inclination direction, Re indicates taking a real part of a complex function, Im indicates taking an imaginary part of the complex function, x indicates the horizontal width of the tunnel, y indicates the vertical height of the tunnel, i represents an imaginary number, and f(x+yi) and w(x+yi) represent a complex stress function:
f
⁡
(
x
+
yi
)
=
1
2
⁢
π
⁡
(
1
+
3
-
γ
1
+
γ
)
⁢
(
F
x
+
iF
y
)
⁢
ln
⁡
(
x
+
yi
)
⁢
w
⁡
(
x
+
yi
)
=
1
2
⁢
π
⁡
(
1
+
3
-
γ
1
+
γ
)
⁢
(
F
x
+
iF
y
)
⁢
ln
⁡
(
x
+
yi
)
,
wherein Fx represents a surface force in the horizontal direction, Fy indicates a surface force in the vertical direction, and γ represents Poisson's ratio, and
sending out a safety early warning when any of the calculated stress components of the tunnel section in all directions reaches or exceeds a stress threshold of surrounding rock.

89 more elements

A safety early warning device for full-section tunneling of a tunnel featuring dynamic water and weak surrounding rock, comprising

a three-dimensional laser scanner,
a geological radar device,
a displacement module,
an industrial computer,
a data transmission module,
an alarm, and
a server,
wherein the three-dimensional laser scanner is used for conducting three-dimensional laser scanning on a tunnel in real-time with an origin as a center to obtain point cloud data;
the geological radar device is used for collecting surrounding rock data in real-time;
the displacement module is used for allowing the origin of a coordinate system to move along a tunnel excavation line as tunnel excavation construction progresses;
the industrial computer is connected with the three-dimensional laser scanner, the geological radar device, the displacement module, the data transmission module and the alarm, conducts data interaction with the server through the data transmission module, and controls the three-dimensional laser scanner, the geological radar device, the displacement module and the alarm according to instructions;
the data transmission module is used for data interaction between the industrial computer and the server;
the alarm is used for sending an alarm under the control of the industrial computer according to instructions;
the server is connected with the data transmission module and used for processing and analyzing the received data, generating relevant instructions according to analysis results and transmitting the instructions to the industrial computer;
the processing and analysis of the received data comprise:
constructing a tunnel excavation dynamic model, and conducting stress analysis according to the tunnel excavation dynamic model, and the stress analysis process is as follows:
calculating stress components of a tunnel section in all directions by the following formula:
σx=2 Re[f(x+yi)]−Re[(x−yi)f(x+yi)+w(x+yi)]
σy=2 Re[f(x+yi)]+Re[(x−yi)f(x+yi)+w(x+yi)]
σxy=Im[(x−yi)f(x+yi)+w(x+yi)]
where σx indicates a stress component in a horizontal direction, σy indicates a stress component in a vertical direction, σxy indicates a stress component in a 45-degree inclination direction, Re indicates taking a real part of a complex function, Im indicates taking an imaginary part of the complex function, x indicates the horizontal width of the tunnel, y indicates the vertical height of the tunnel, i represents an imaginary number, and f(x+yi) and w(x+yi) represent a complex stress function:
f
⁡
(
x
+
yi
)
=
1
2
⁢
π
⁡
(
1
+
3
-
γ
1
+
γ
)
⁢
(
F
x
+
iF
y
)
⁢
ln
⁡
(
x
+
yi
)
⁢
w
⁡
(
x
+
yi
)
=
1
2
⁢
π
⁡
(
1
+
3
-
γ
1
+
γ
)
⁢
(
F
x
+
iF
y
)
⁢
ln
⁡
(
x
+
yi
)
where Fx represents a surface force in the horizontal direction, Fy indicates a surface force in the vertical direction, and γ represents Poisson's ratio, and
sending out a safety early warning signal when any one of the calculated stress components of the tunnel section in all directions reaches or exceeds a stress threshold of the surrounding rock.

99 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/478,307Filed 17 Sep 2021
Priority: CN 202011088248.X13 Oct 2020
Published: US 2022/0112806 A114 Apr 2022
Granted: 25 Apr 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

E21F 17/185
Special adaptations of signalling or alarm devices: rock-pressure control devices with or without alarm devices; Alarm devices in case of roof…
E21D 9/003
Tunnels or galleries, with or without linings; Methods or apparatus for making thereof ; Layout of tunnels or galleries: arrangement of measuring…
E21F
Safety devices, transport, filling-up, rescue, ventilation, or draining in or of mines
E21D
Shafts