Large-scale model test for studying the water inrush during tunnel excavation in fault

Wang, Yingchao; Chen, Fan; Sui, Wanghua; Meng, Fanshu; Geng, Fan

doi:10.1007/s10064-022-02733-9

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…The model box [42] is shown in Figure 1; the internal net size of the model experiment box is 2:5 m × 1:0 m × 1:4 m (length × width × height). There are two tunnel openings of different sizes on the front and side of the model box.…”

Section: The Model Experiments Devicementioning

confidence: 99%

“…The artificial rainfall simulation system [42] is mainly composed of the rainfall device and the rainfall control system, as shown in Figures 2 and 3. In the rainfall control system, the appropriate rainfall intensity can be selected in the rain intensity selection areas according to the experiment requirements.…”

Section: The Model Experiments Devicementioning

confidence: 99%

“…The groundwater seepage simulation system [42] is mainly composed of the intelligent pressurized water supply and the drainage system, as shown in Figure 4. In the intelligent The ground pressure loading system…”

Section: The Model Experiments Devicementioning

confidence: 99%

“…The tunnel excavation simulation system [42] is shown in Figure 5. The tunnel excavation device has four specifications of the excavation radius, including 15 cm, 20 cm, 25 cm, and 30 cm.…”

Section: The Model Experiments Devicementioning

confidence: 99%

“…The ground stress loading system [42] is mainly composed of two compression plates, each of which has an area of 0.3 m 2 , as shown in Figure 6. The maximum pressure control range is 50 mm, and the maximum simulated ground stress is 1 MPa.…”

Section: The Model Experiments Devicementioning

confidence: 99%

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The Progressive Failure Mechanism of the Tunnel-Slope System under Rainfall: An Experimental Investigation

2022

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Tunnel excavation has always been an important reason for the stability failure of the tunnel-slope system at the portal section. In case of rainfall, it is likely to cause serious disasters such as tunnel vault collapse, water inrush from the tunnel face, and slope slip. In this study, the Sunjiaya tunnel of the Daping slope group was taken as the engineering background, and the tunnel model experiment system under the condition of rainfall and groundwater seepage was designed independently to explore the failure laws of slope instability induced by tunnel excavation under the condition of rainfall. Meanwhile, a fiber grating monitoring system was also used to measure the displacement, water content, earth pressure, and seepage pressure at different positions of the tunnel-slope system in the process of tunnel excavation under the condition of rainfall. The results show that the slope instability caused by rainfall infiltration is gradual. At the beginning of rainfall, the rainfall infiltration has little effect on the stability of the tunnel-slope system and then gradually increases with the continuous rainfall. Finally, the slope surface is uneven, and the phenomenon of gully and surface flow is serious. The foot of slope moves back continuously, resulting in overall collapse. Moreover, during the process of tunnel excavation, the cracks on the tunnel vault of the unburied tunnel lining develop in quadratic along the tunnel excavation direction, and the closer to the excavation section, the larger the collapse range. Finally, there is an integral collapse of the vault of tunnel excavation section. In addition, variation laws of parameters in the tunnel-slope system also provide an important explanation for the hysteresis of the stability failure of the tunnel-slope system. The results have important guiding significance for the stability of the tunnel-slope system during construction.

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Section: The Model Experiments Devicementioning

confidence: 99%

Section: The Model Experiments Devicementioning

confidence: 99%

Section: The Model Experiments Devicementioning

confidence: 99%

“…The tunnel excavation simulation system [42] is shown in Figure 5. The tunnel excavation device has four specifications of the excavation radius, including 15 cm, 20 cm, 25 cm, and 30 cm.…”

Section: The Model Experiments Devicementioning

confidence: 99%

Section: The Model Experiments Devicementioning

confidence: 99%

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