Journal of Shandong University(Engineering Science) ›› 2023, Vol. 53 ›› Issue (5): 57-64, 73.doi: 10.6040/j.issn.1672-3961.0.2023.070

• Civil Engineering • Previous Articles     Next Articles

Damage evaluation method and application of surrounding rock of underground research laboratory during excavation

Qiangyong ZHANG(),Zhichao YAN,Xin GUO*()   

  1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2023-03-09 Online:2023-10-20 Published:2023-10-19
  • Contact: Xin GUO E-mail:qiangyongz@sdu.edu.cn;jltngx@126.com

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Abstract:

In order to reveal the damage evolution law of the surrounding rock during the excavation of the underground research laboratory, the deep underground research laboratory with a buried depth of 560 m in Gansu Beishan was taken as the research background project. An elastic-plastic damage constitutive model of the deep surrounding rock based on the Hoek-Brown criterion was established. The evaluation method for the damage degree of surrounding rock during excavation was proposed. The calculation program was developed and numerical simulations of the excavation and overload processes of the underground research laboratory construction were conducted. The research results showed that after the excavation of the cavern group, the surrounding rock was in slight elastic damage state with no plastic damage, the cavern group was safe and stable as a whole; with the increase of overload, the damage areas of the surrounding rock expanded significantly; when the overload reached 2.5 times the initial in-situ stress, the high damage areas and excavation rupture areas appeared at the intersection of the cavern group. It was recommended to strengthen the support for the intersection of the cavern group and monitor the middle partition wall. The research results provided guidance for optimizing the construction scheme of the underground research laboratory.

Key words: deep underground laboratory, elastic-plastic damage constitutive model, Hoek-Brown criterion, excavation damage area, excavation damage degree

CLC Number: 

  • TU45

Fig.1

Mechanical test of original rock"

Fig.2

Stress-strain curves of rock under different confining pressures"

Fig.3

Stress-strain curves and stages diagram of progressive failure process of rock sample"

Table 1

Characteristic strength parameters of surrounding rock"

λ A mb0 s0 mbf sf σc/MPa a
3.71 0.32 9.98 0.31 19.81 0.68 152.8 0.5

Fig.4

Diagram of excavation zone, damage and stress characteristic values of surrounding rock"

Fig.5

Corresponding position of EDZ on stress-strain curve of triaxial compression"

Fig.6

Flow chart of calculation program of excavation damage degree IED for the underground cavern"

Fig.7

Caverns distribution of underground laboratory"

Fig.8

Three-dimensional numerical calculation model"

Fig.9

Typical section and position of monitoring points in working conditions A and B"

Fig.10

IED distribution nephogram of typical section under working conditions A and B"

Fig.11

Comparison of tunnel displacement between numerical calculations and model test results after excavation"

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