Study on Deformation Response Caused by Large-Section Excavation Under the Support of Pipe-Roof and Beam

doi:10.12068/j.issn.1005-3026.2024.01.016

Abstract

Abstract:

Based on the similar model test of large-section excavation under the action of pipe-roof and beam，the variation law of pipe-roof deformation and surface settlement caused by excavation was studied. In order to fully study the influence of parameter changes on the pipe-roof deformation and surface settlement，a three-dimensional numerical model was established by using the finite element software. Based on this model，the effects of the flexural stiffness of the pipe-roof and the beam on the pipe-roof deformation and surface settlement were analyzed，and the optimal stiffness matching was studied according to the fuzzy mathematical theory. The results indicate that the overall deformation of the pipe-roof structure resembles a “plate”and exhibits symmetry about the middle pipe-roof. The surface settlement of the cross section of the pipe-roof forms a “grooved”pattern，conforming to the Peck curve distribution. The pipe-roof deformation and surface settlement are exponential functions of the beam stiffness and the pipe-roof stiffness，with greater sensitivity to changes in the beam stiffness. The safety and economy can be taken into account when the beam stiffness and the pipe-roof stiffness are 0.5D and 2K respectively.

Key words: pipe-roof, model test, pipe-roof deformation, surface settlement, stiffness matching

CLC Number:

TU 94

Qian BAI, Wen ZHAO, Wen-xin CAO, Yan-jun LU. Study on Deformation Response Caused by Large-Section Excavation Under the Support of Pipe-Roof and Beam[J]. Journal of Northeastern University(Natural Science), 2024, 45(1): 129-136.

Figures/Tables 18

Fig. 1 Plan view of Shifu Road station

Fig. 2 Model test device diagram （unit：mm）

Fig. 3 Elastic modulus test of LDPE materials

Table 1 Physico‐mechanical parameters

类型	含水率	湿密度	c	φ	E_s
类型	%	g·cm^-3	kPa	（°）	MPa
原型土	10.4	1.81	1.5	35	36~48
模型土	10.4	1.78	0.98	33.1	1.04

Fig. 4 Layout of measuring points （unit：mm）

Fig. 5 Model test

Fig. 6 Pipe‐roof deformation at section P1 and P2 after excavation

Fig. 7 Variation of pipe‐roof deformation with excavation length at P1‐3 and P2‐3

Fig. 8 Surface settlement at section G3 after excavation

Fig. 9 Variation of surface settlement with excavation length at G3‐6 and G4‐1

Table 2 Parameter combinations

编号	管幕刚度	横梁刚度
1	0.5D	0.5K
2	0.5D	K
3	0.5D	1.5K
4	0.5D	2K
5	D	0.5K
6	D	K
7	D	1.5K
8	D	2K
9	1.5D	0.5K
10	1.5D	K
11	1.5D	1.5K
12	1.5D	2K
13	2D	0.5K
14	2D	K
15	2D	1.5K
16	2D	2K

Fig. 10 Calculation model

Fig. 11 Comparison between test values and simulated values

Fig. 12 Variation of pipe‐roof deformation with

Fig. 13 Variation of surface settlement with

Fig. 14 Surface settlement values under different parameter combinations

Table 3 Parameters of the specimens

编号	y₁₁/mm	y₁₂/万元
3	49.05	29.86
4	45.8	31.12
7	47.9	35.82
8	44.7	37.08
11	47.1	40.12
12	43.45	41.38
14	49.05	42.32
15	44	43.58
16	41.5	44.85

Table 4 Calculation results of membership ti

i	t_i	i	t_i
1	0.50	6	0.49
2	0.67	7	0.08
3	0.38	8	0.38
4	0.55	9	0.50
5	0.29

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