Numerical Model Research of Super Deep Shaft Sidewall Destruction

Transcription

1 6 5 Vol Chinese Journal of Underground Space and Engineering Oct * ANSYS TU93 A Numerical Model Research of Super Deep Shaft Sidewall Destruction Chen Xiangfu 1 2 Shen Mingliang 1 Zhang Yong 3 Jiang Hui 4 1. Department of Geotechnical Engineering Tongji University Shanghai China 2. China State Construction Engineering Corp Beijing China 3. Construction Institute of Coal Industry Jinan Design & Research Co. Ltd Jinan China 4. Fujian Jiaojian Group Engineering Co. Ltd Xiamen China Abstract The non-mining damage of shaft occurred frequently in China. Especially it may manage to occur repeatedly after repair. This causes heavy losses to the coal industry in China. The vertical additional force on the shaft is regarded as the main reason. This article takes the actual shaft as an example to establish a three-dimensional integral finite element model of double reinforced concrete sidewall by the software of ANSYS. The stress and strain at the time of sidewall damage as the vertical additional force change is investigated in this article as well as the plastic zone location the damage form and time. A set of numerical methods which can forecast the sidewall damage is established. The result of this method coincides well with the practical situation. This forecasting method can be used widely in the coal industry in China. This may be a good protection for the coal industry. 1 Keywords shaft sidewall drainage additional force plastic zone damage forecast 80 1 ~ 3 * chenxiangfu@ sina. com

2 Fig. 1 Model and load distribution of sidewall v m v' MPa /a 20 f n = m m MPa 350 f n d Ⅱ φ25@ 162 μ = Ⅱ φ25@ 210 Ⅱ φ25@ G μ = G = ρh ρ H G = MPa 3 P P = KH 1 ~ 10 m 4 H K Y = 20 m P = MPa Y = 40 m P = MPa 20 m MPa 5 f n 2 G 3 P f n f n v = kpa /m 5 1 /4 40 m r = f n m R = m v' 0. 6m 0. 4m v' = 2RHv R 2 - r 2 f n = mv' SOLID65 R r H

3 ~ 9 1 Table 1 1 Parameters of concrete and steel bar E μ f t Pa Pa E μ Pa Pa μ μ MPa 1 / ~ 11 Fig. 2 2 Geometric model of planform of double layer sidewall vertical view 4 Fig. 4 Model load Fig v = kpa /m G = MPa P Y = 20 m P = MPa Y = 40 m P = MPa 5 Fig. 5 Enlarged view for the load 3 Geometric model of planform of double layer sidewall vertical view Y = 20 m σ max = Pa ε max =

4 Fig. 6 First principal stress 9 Fig. 9 Second principal strain 7 Fig. 7 First principal strain 10 Fig. 10 Third principal stress 8 Fig. 8 Second principal stress Y = 20 m σ max = Pa ε max = Y = 20m σ max = Pa ε max = Fig. 11 Third principal strain

5 Fig Plastic zone in the year of sixteen { σ r = MPa σ θ = MPa σ z = MPa Fig. 13 Plastic zone enlarged view in the year of sixteen Y = 20m 槡 σ 2 r + σ 2 θ + σ 2 z - σ r σ θ - σ r σ z - σ z σθ = MPa < MPa { σ r = MPa σ θ = MPa 14 σ z = MPa 槡 σ 2 r + σ 2 θ + σ 2 z - σ r σ θ - σ r σ z - σ z σθ = MPa > MPa 1 ~ 10m Fig Destruction of sidewall 4. 4 Y = 20 m f z = f c + μf y = = MPa f z f c μ f y

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