Numerical Study and Field Monitoring of the Ground Deformation Induced by Large Slurry Shield Tunnelling in Sandy Cobble Ground

Zhang, Chengping; Cai, Yi; Zhu, Wenjun

doi:10.1155/2019/4145721

Cited by 15 publications

(7 citation statements)

References 24 publications

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“…e montmorillonite content of the bentonite used in the experiment was 63.35%. e density of the bentonite suspension was 1.01 g/cm 3 , and the bentonite content was 9.2%. Silt sand particles were screened by vibrating screen into three different particle groups, and the particle size range is <75 μm, 75 μm∼100 μm, and 100 μm∼150 μm.…”

Section: Experimental Materialsmentioning

confidence: 99%

“…Large-diameter slurry shields are widely used in urban tunnel engineering and sea-(or river-) crossing traffic tunnel engineering [1][2][3]. During shield construction, the mud slurry penetrates soil and forms a mud filtration cake on the excavation surface, which can balance the pressure of water and soil in the ground; thus, the excavation surface is stabilized.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large‐Diameter Slurry Shield Tunneling

Kou

Zhao

Lian

et al. 2021

Advances in Civil Engineering

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Multiple soil layers may be exposed simultaneously on the excavated surface of a large-diameter slurry shield. To study the formation and characteristics of mud filtration cake on the excavation surface during large-diameter slurry shield tunneling, penetration tests of mud slurries in different soils were carried out using a self-made device, and the microstructures of different mud filtration cakes were observed using scanning electron microscopy. The test results showed that there were three categories of filling forms for mud slurries permeating the soils: mud filtration cake, mud cake + permeation zone, and permeation zone; correspondingly, there were three types of filtration loss, which was mainly affected by the specific gravity of mud slurry. Finally, the porosity and the fractal dimension for the pore area of the mud filtration cake were calculated, and it is found that the fractal dimension of pore area is beneficial to classify the type of mud filtration cake.

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Section: Experimental Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large‐Diameter Slurry Shield Tunneling

Kou

Zhao

Lian

et al. 2021

Advances in Civil Engineering

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“…According to the inspection results of double-arch tunnels in Sichuan and Chongqing, the depth or height of voids behind the lining generally ranged from 0.15 to 0.50 m, and the maximum value reached 1.09 m [19]. In practical engineering, field monitoring remains a generally recognized approach for understanding the deformation of the ground and the neighboring structures [20][21][22], whereas there are numerous voids with different sizes developed around the double-arch tunnel lining. Different arrangements and sizes of voids can change stress, deformation, and failure of the lining.…”

Section: Numerical Schemesmentioning

confidence: 99%

Effect of Voids Behind Lining on the Failure Behavior of Symmetrical Double-Arch Tunnels

Min

et al. 2019

Symmetry

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The presence of voids behind lining seriously affects the safety of the symmetrical double-arch tunnels during service life. It is essential to find out the impact of voids on tunnel safety due to the increasing demand for the construction and maintenance of symmetrical double-arch tunnels. Model tests and numerical analyses were conducted in this research. The results attained were explored including earth pressure, internal force, and lining failure. Results reveal that the presence of voids has a large influence on the internal force in the lining of symmetrical double-arch tunnels, generally in the form of asymmetrical failure patterns of the lining. The failure patterns of the lining are greatly influenced by the size and location of voids with respect to the symmetrical double-arch tunnel circumference. Significant changes in the lining internal forces were found at the areas in the close vicinity of the void whereas a few changes were found at the bottom of the sidewall, the invert, and the central wall far away from the void. The propagation laws of lining cracks of asymmetrical double-arch tunnels are more complicated than symmetrical tunnels with a void behind the central wall. The location of the initial cracking of symmetrical and asymmetrical double-arch tunnels is the same, while the lining failure of the large-section tunnel is the most complicated.

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“…Li [4] analyzed the effects of excavation method, reserved bench length, advanced support, and tunnel burial depth on ground settlement based on the Harbin subway tunnel. Zhang et al [5] used a three-dimensional finite difference model to simulate the advance grouting and grouting hardening of the shield tunnel and compared it with the field measurement data to analyze the lateral settlement, longitudinal settlement, and horizontal displacement of the ground. It is concluded that the lateral settlement occurs at about 1.5 times of the excavation diameter.…”

Section: Introductionmentioning

confidence: 99%

Research on Ground Settlement Regularity of Soft Rock Tunnel under Ultrasmall Distance

Zhang

Hou

Sun

et al. 2021

Advances in Civil Engineering

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During the tunnel construction under the road, the shallower the tunnel depth, the greater the effect of the surface settlement. Thus, to analyze the ground settlement caused by tunnel construction under ultrasmall distance, the research is based on a tunnel in Ningqiang County and uses numerical simulation and measurement to analyze the ground settlement and the effect of reinforcement measures. The research draws the following conclusions. For the ultrasmall distance tunnel under road construction, the combination of pipe shed and advanced small pipe grouting reinforcement measures inhibits the surface settlement. After the advanced small pipe is reinforced, the surface settlement value is reduced by about 25%, and the reinforcement effect is more obvious after the increase of the large pipe shed. The surface settlement value is reduced by about 60%. The surface settlement caused by the excavation of the circular soil accounts for about 50%–60% of the total settlement value, which is for the whole construction. The key processes, which involve the combination of reinforcement measures, focused on the suppression of surface settlement caused by the excavation of the circular soil. After the reinforcement measures, the variation of the settlement groove width was not obvious but the curvature and peak value of the settlement groove is reduced significantly.

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Numerical Study and Field Monitoring of the Ground Deformation Induced by Large Slurry Shield Tunnelling in Sandy Cobble Ground

Cited by 15 publications

References 24 publications

Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large‐Diameter Slurry Shield Tunneling

Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large‐Diameter Slurry Shield Tunneling

Effect of Voids Behind Lining on the Failure Behavior of Symmetrical Double-Arch Tunnels

Research on Ground Settlement Regularity of Soft Rock Tunnel under Ultrasmall Distance

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