Model Test Study on the Antibreaking Technology of Reducing Dislocation Layer for Subway Interval Tunnel of the Stick‐Slip Fracture

Cui, Guangyao; Wang, Xuelai

doi:10.1155/2019/4328103

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…the vault displacement values in hard rock section are similar, but the vault displacement values of each monitoring section in soft rock section near interface increase obviously; that is, there is a significant displacement difference at the interface of soft and hard rock. e authors believe that a large number of circular staggered platform cracks ( Figure 10) occurring in tunnel lining at interface of soft and hard rock in literatures [7][8][9] are related to the displacement difference at the interface between soft and hard rock. e explanation is as follows: the tunnel can be regarded as a cantilever beam buried in hard rock, and the free end is constrained by the stratum of soft rock section, so the displacement of root of cantilever beam (located in hard rock section) is small.…”

Section: Displacement Difference Of Interfacementioning

confidence: 99%

“…However, the survey of seismic damage after Wenchuan earthquake in China showed that the seismic damage of tunnel also mainly occurred in geological section at interface of soft and hard rock, and the tunnel linings were peeled, cracked, staggered, and collapsed in different degrees, such as the Baiyunding Tunnel from the G213 highway of Yingxiu to Dujiangyan in Sichuan Province and Longxi Tunnel on the Yingdu expressway. e tunnel linings of interface section between soft and hard rock on these two lines showed circumferential cracks with 1 cm∼3 cm widths after earthquake [2,[7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Characteristics of Seismic Damage and Damping Technology of Absorbing Joint of Tunnel Crossing Interface of Soft and Hard Rock

Wang

Yuan²,

Cui

et al. 2020

Shock and Vibration

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It has generally been believed that the serious seismic damage of tunnel mainly occurred in portal section and fault dislocation zone. However, the survey of seismic damage showed that the seismic damage of tunnel also mainly occurred in geological section at interface of soft and hard rock. Currently, merely scholars have made some research studies on characteristics of seismic damage and damping technology of tunnel crossing the vertical interface between soft and hard rock in high intensity area, and the mechanism of seismic damage has not been clearly revealed. Therefore, based on the Urumqi Metro Tunnel project in China, a three-dimensional six-degree-of-freedom shaking table model test was carried out. Through comparative analysis of peak ground acceleration (PGA), displacement difference at the interface between soft and hard rock, and structural safety factor under 5 kinds of conditions, the seismic damage characteristics of tunnel crossing interface of soft and hard rock were revealed, and a new damping technology of absorbing joint was proposed. The following findings can be drawn. (1) The seismic damage of tunnel is mainly affected by stratum inertial force under the homogeneous stratum of soft rock. The seismic damage of tunnel is mainly caused by the forced displacement (the displacement difference between the two sides of interface of soft and hard rock), followed by stratum inertial force under the geological condition of interface between soft and hard rock. (2) The conventional type of absorbing joint (only the second lining is set with absorbing joint) is used in tunnel lining structure, and the damping ratios of principal tensile stress, bending moment, and axial force of lining are above 47.5%, 40.7%, and 72.7%, respectively. Compared with conventional type of absorbing joint, the damping effect of new type of absorbing joint (staggered absorbing joints of primary support and secondary lining) is 19.9% higher than that of conventional type. (3) The new type of absorbing joint is recommended for tunnel crossing interface section of soft and hard rock. The specific implementation suggestions are as follows: the setting interval of second lining absorbing joint is the same as the length of lining formwork trolley, and the interval of primary support absorbing joint can be set according to excavation footage length. The filling materials in second lining absorbing joint can be shared with the rubber waterstop set in construction joint, and the primary support absorbing joint can be realized by injecting mixtures of rubber particles and shotcrete.

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Section: Displacement Difference Of Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Characteristics of Seismic Damage and Damping Technology of Absorbing Joint of Tunnel Crossing Interface of Soft and Hard Rock

Wang

Yuan²,

Cui

et al. 2020

Shock and Vibration

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“…Through investigation, it is found that strong earthquake can induce the activation of the stick-slip fault, and the dislocation of the fault is the primary factor causing the serious damage of the tunnel across the stick-slip fault (Cui, G. Y., and Wang, X. L., 2019;(Baziar, M. H., et al, 2016;Ardeshiri-Lajimi, S., et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%

“…At present, more and more experts and scholars have done a lot of research on the anti-breaking measures and reducing dislocation measures. Relying on the tunnel project of Urumqi Metro Line 1 crossing the F2-3 section of Jiujiawan active fault, Cui, G. Y., et al (2019) adopted the method of model test to make a comparative analysis of the different anti-breaking effects of the reducing dislocation layer under different construction position. Shahidi, A. R., and Vafaeian, M. (2005) carried out a series of studies on the Koohrangs hydraulic tunnel in Greece, and compared and analyzed the in uence of the anti-breaking effect of the reducing dislocation joint with different spacing under the in uence of the stick-slip fault.…”

Section: Introductionmentioning

confidence: 99%

Test on Rigid-flexible Composite Anti-breaking Measure for Tunnels across Stick-slip Fault

Guang-yao

Bohan

2021

Preprint

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In this paper, based on the F8 stick-slip fault section of Longxi Tunnel in China, the effect of the anti-breaking measure of rigid-flexible composite (reinforcement of the secondary lining & construction of the reducing dislocation layer between the primary support and the secondary lining) is studied by using the method of indoor model test in order to improve the anti-breaking performance of the tunnel across stick-slip fault in the actual tunnel engineering. The test results show that the anti-breaking effect is limited by adopting structural strengthening measures to resist the influence of stick-slip dislocation on the tunnel structure and the anti-breaking effect is obvious by adopting the measures of reducing dislocation layer only. However, the structural safety of the tunnel with stick-slip fault in the strong seismic intensity area can be greatly improved by adopting the anti-breaking measure of rigid-flexible composite, and the structural safety factor can be significantly improved. The research results of this paper can provide a reference for the anti-breaking design of the tunnel across stick-slip fault in the high seismic intensity area.

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“…Strong earthquakes can induce the activation of stick-slip faults [6]. e stick-slip dislocation of faults is the most important factor leading to serious damage of tunnel structures, and strong earthquake vibration is the second major factor.…”

Section: Introductionmentioning

confidence: 99%

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

Cui

Wang

et al. 2020

Advances in Materials Science and Engineering

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In order to improve the structural safety and stability of the tunnels crossing stick-slip fault, an indoor model test on the effect of tunnel antibreaking measures under the influence of fault stick-slip movements was conducted. Using contact pressure, longitudinal strain, and safety factor, the antibreaking effect of tunnels was compared and analyzed under 5 kinds of operating conditions, mainly including no measures, structural strengthening, structural strengthening and reducing dislocation layer, structural strengthening and reducing dislocation joint, structural strengthening and reducing dislocation layer, and reducing dislocation joint. The results showed that the longitudinal strain and contact pressure of the tunnel changed markedly (from severe change to more uniform change) when the reducing dislocation measures were adopted in the test, reducing dislocation layer/joint or reducing dislocation layer and reducing dislocation joint. The effect of reducing the fault stick-slip dislocation on the tunnel structure is very limited by only taking structure strengthening measures. The effect of reducing the fault stick-slip dislocation on the tunnel structure is obvious by using the reducing dislocation method, and the minimum safety factor is increased by more than 8 times. The effect of resisting and reducing the fault stick-slip dislocation on the tunnel structure is remarkable by adopting the measures of the structural strengthening and reducing dislocation layer and reducing dislocation joint, and the minimum safety factor is increased by more than 25.45 times. The results can provide reference for the design of antibreaking for the stick-slip fault tunnel in high earthquake intensity and dangerous mountainous areas.

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Model Test Study on the Antibreaking Technology of Reducing Dislocation Layer for Subway Interval Tunnel of the Stick‐Slip Fracture

Cited by 7 publications

References 11 publications

Experimental Study on Characteristics of Seismic Damage and Damping Technology of Absorbing Joint of Tunnel Crossing Interface of Soft and Hard Rock

Experimental Study on Characteristics of Seismic Damage and Damping Technology of Absorbing Joint of Tunnel Crossing Interface of Soft and Hard Rock

Test on Rigid-flexible Composite Anti-breaking Measure for Tunnels across Stick-slip Fault

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

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