Table 5 List of section information.

From: Safety risk assessment of loess tunnel construction under complex environment based on game theory-cloud model

Number

Section mileage

Surrounding rock grade

Buried depth/m

Engineering geological conditions

Risk factors

1

DK194 + 803

V

16

The stratum of the cave is mainly Quaternary aeolian loess, interspersed with multiple layers of paleosol and self-weighted collapsible site at the entrance

Shallow buried section, easily deformed surrounding rock, blocks falling, fall of ground

2

DK194 + 945

V

28.04

The stratum of the cave is mainly Quaternary aeolian loess, interspersed with multiple layers of paleosol, and the soft plastic loess interlayer zone is distributed in the cave body

Shallow buried section, easily deformed surrounding rock, blocks falling, fall of ground

3

DK195 + 095

IV

54.95

The depth of the cave is deeper, and the stratum of the cave is mainly Quaternary aeolian loess, interspersed with multiple layers of paleosol

–

4

DK196 + 680

V

45.7

Undercrossing S304 provincial road

5

DK196 + 760

V

43.73

Inclined shaft intersection section, undercrossing S304 provincial road

6

DK196 + 840

V

43.66

The depth of the cave is deeper, and the stratum of the cave is Quaternary aeolian loess, and the loess at the top of the cave is soft-plastic, interspersed with multiple layers of paleosol

Undercrossing sewage treatment plant

7

DK198 + 558

VI

11.82

The stratum of the cave is mainly Quaternary aeolian loess, interspersed with multiple layers of paleosol

Shallow buried section, undercrossing residential area

8

DK198 + 593

VI

10.96

Shallow buried section in exit, undercrossing residential areas

9

DK198 + 663

VI

10.58

10

DK198 + 877

VI

9.01

The stratum of the cave is mainly Quaternary aeolian loess, interspersed with multiple layers of paleosol, self-weighted collapsible site at the exit

Harmful geological soil, super shallow buried section

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