Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 788-797.doi: 10.13229/j.cnki.jdxbgxb20180285

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Model test of the influence on shield shaft owing to water loss settlement of deep sandstone aquifer layer

Lei ZHANG(),Bao⁃guo LIU,Zhao⁃fei CHU   

  1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
  • Received:2018-03-29 Online:2019-05-01 Published:2019-07-12

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Abstract:

To study the influence of uneven settlement on the structure of inclined shaft segment caused by the drainage of overlying water?bearing sandstone after coal mining, a similar simulation test was carried out on the area where inclined shaft crossed the boundary between coarse?grained sandstone and sandy mudstone. The settlement rule of water?bearing sandstone and longitudinal and hoop stress?strain distribution of inclined shaft segment was simulated by model test in different formation pressure, pore pressure and drainage rate. The distribution rule and influencing factors of additional stress in the inclined shaft segment were analysed. At the same time, according to the model test, the influence of additional stress, surrounding rock pressure and pore?water pressure caused by uneven settlement on the inclined shaft segment was put forward.

Key words: civil engineering, tunnelling engineering, model test, uneven settlement, additional stress

CLC Number: 

  • TU452

Fig.1

Crossing stratigraphic profile for shield shaft and simulation area"

Table 1

Basic parameters of ground"

介质 ρ/(g·cm-3) E/GPa σ c/MPa n/% k/(cm·s-1） M
A 2.24 13.8 19.7 23.1 6.21×10-5 0.71
B 2.49 28.9 41.5 12.9 1.79×10-7 0.74

Fig.2

Compression drainage deformation curves of similar material of coarse grained sandstone"

Table 2

Basic parameters of similar materials of ground"

介质

ρ/

（g·cm-3）

 E/MPa σ c/MPa n/% k/(cm·s-3） M
a 1.81 168 0.46 23.3 4.59×10-4 0.72
b 1.76 311 0.92 - - 0.74

Fig.3

Shield inclined shaft model"

Fig.4

Whole test model"

Fig.5

Size of model bench and sensors arrangement"

Fig.6

Arrangement of strain gauge rosette oninclined shaft"

Table 3

Cases of aquifers dewatering tests"

试验工况 地层荷载/kPa 孔隙水压/kPa

排水速率/

(L?min—1)
I 100 20 0.1
II 100 20 0.4
III 100 40 0.4

Fig.7

Paving model"

Fig.8

Curves of pore water pressure and soil pressure"

Fig.9

Ground settlement curves of 3 cases"

Fig.10

Curves of axial strain of each section of inclined shaft under 3 conditions"

Fig.11

Schematic diagram of longitudinal strain and internal force of inclined shaft"

Fig.12

Longitudinal moment and axial force curves of inclined shaft before and after water drainaging"

Table 4

Increment percentage of the longitudinal axial thrust and moment of inclined shaft caused by dewatering"

内力 工况/截面 1 2 3 4 5
轴力 I 18.3 35.4 32.5 38.8 19
II 16.2 24.7 35.6 40.2 22.2
III 25.5 43.2 44.9 61.1 30.9
弯矩 I 22.1 30.4 42.4 68.9 24.5
II 23.2 36.9 50.5 53 22.9
III 35.2 40.2 74 75.1 33.2

Fig.13

Distribution of minimum principal stress on inclined shaft before and after dewatering"

Table 5

Increment percentage of minimum principal stress on inclined shaft caused by dewatering"

位置 工况 截面
1 2 3 4 5
拱顶 I 23.0 19.9 17.3 30.9 16.9
II 22.2 23.4 21.3 25.9 14.1
III 29.8 35.1 43.3 45.6 18.4
拱腰 I 16.4 17.4 22.3 31.2 20.7
II 17.0 12.6 13.7 33.8 19.9
III 23.4 19.0 27.2 35.1 22.1
拱底 I 26.1 20.7 31.0 27.4 16.1
II 23.1 21.9 19.9 23.7 14.2
III 28.7 39.7 42.4 43.4 24.6
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