Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (3): 596-603.doi: 10.13229/j.cnki.jdxbgxb20200818

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Experiment on mechanical properties of new type assembled double-cabin utility tunnel

Ya-chuan KUANG1(),Zhe-xuan SONG1,Yin-hu LIU2,Xiao-fei MO3,Liang-ming FU2,Shi-quan LUO2   

  1. 1.School of Civil Engineering，Central South University，Changsha 410075，China
    2.Power China Zhongnan Engineering Corporation Limited，Changsha 410014，China
    3.Jinke Property Group Co. ，Ltd. ，Chongqing 401121，China
  • Received:2020-10-26 Online:2022-03-01 Published:2022-03-08

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Abstract:

Based on the U-shaped hoop pin and longitudinal rib connection technology， a new type of assembled utility tunnel was proposed. Through the static load test of the full-scale model， the mechanical properties of the new assembled double-cabin utility tunnel， such as load-bearing capacity， deformation capacity， and component cracking， were studied systematically. The test results show that the connection performance of the U-shaped hoop pin and longitudinal rib connection is reliable. When the test is loaded to the design load of 435 kN， cracks appear at the end of the assembled utility tunnel. During the loading process， the long-span roof slab of the assembled utility tunnel experiences three stages： cracking， stiffness degradation and ultimate failure. Under the characteristic value of load， the crack width and deflection of the assembled utility tunnel do not exceed the specification limits， which meet the requirements of the normal service limit state. The ultimate bearing capacity of the utility tunnel is 3.71 times of the design value of load. The ultimate bearing capacity meets the design requirements， and there is a large safety reserve. The experimental research results provide a technical basis for the practical application of the utility tunnel of this new assembly scheme.

Key words: Structural Engineering, assembled double-cabin utility tunnel, U-shaped hoop, full-scale model, static test, mechanic property

CLC Number: 

  • TU990.3

Fig.1

Schematic diagram of U-shaped hoop pinand longitudinal rib connection"

Fig.2

New assembled utility tunnel"

Fig.3

Reinforcement drawing of tunnel structure"

Table 1

Mechanical properties of steel bar"

钢筋直径/mm屈服强度/MPa极限强度/MPa屈服应变εy

12

14

16

20

428

416

446

453

616

592

622

641

2088

2044

2178

2210

Fig.4

Schematic diagram of test device"

Table 2

Test loading procedure"

加载等级载荷/kN
大跨板小跨板侧墙

1

2

3

4

5（标准值）

6

7（设计值）

8

9

10

11

12

13

14

15

71

142

213

284

355

395

435

507

579

650

722

794

848

884

940

32

64

96

128

160

178

196

229

261

293

325

358

382

398

424

47

94

141

188

235

262

289

336

383

430

478

526

561

585

622

Fig.5

Location of rebar and concrete strain gauge"

Fig.6

Location of displacement device"

Fig.7

On-site loading of assembled utility tunnel"

Fig.8

Development of cracks at thebeginning of the test"

Fig.9

Development of cracks at the end of the test"

Fig.10

Schematic diagram of crack distribution"

Fig.11

Load-displacement curve"

Fig.12

Concrete strain curve"

Fig.13

Steel bar strain curve"

Table 3

Bending capacity of large-span"

截面位置受拉钢筋面积/mm2受压钢筋面积/mm2

受弯承载力

/（kN·m）

侧墙支座

跨中

中间墙支座

2199

2199

2199

2199

1407

2199

386.45

339.74

386.45

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