In-site experiments on the swelling characteristics of a shield tunnel in expansive clay: A case study

Wang, Jianxiu; Liu, Jiaxing; Liu, Xiaotian; Jiang, Yunhua; Liu, Xuezeng

doi:10.1007/s12205-016-1333-4

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…The intricate interaction between water and expansive soft rocks, as investigated in various studies, leads to significant volumetric expansion and changes in the mechanical properties of these materials, often resulting in severe damage to a range of structures such as water engineering facilities, underground chambers, and buildings [1][2][3][4][5][6][7]. This phenomenon is particularly pronounced when tunneling activities intersect with deeply buried, weak rock layers rich in expansive clay minerals.…”

Section: Introductionmentioning

confidence: 99%

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Ma,

Chen,

Chang

et al. 2024

Materials

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This study investigates the dynamics of moisture absorption and swelling in soft rock during tunnel excavation, emphasizing the response to support resistance. Utilizing COMSOL numerical simulations, we conduct a comparative analysis of various strength criteria and non-associated flow rules. The results demonstrate that the Mohr–Coulomb criterion combined with the Drucker–Prager model under compressive loads imposes stricter limitations on water absorption and expansion than when paired with the Drucker–Prager model under tensile loads. Restricted rock expansion leads to decreased horizontal displacement and ground uplift, increased displacement in the tunnel’s bottom arch, and significantly reduced displacement in the top arch. The study also considers the effects of shear dilation, burial depth, and support resistance on the stress and displacement of the surrounding rock. Increased shear dilation angles correlate with greater rock expansion, resulting in increased horizontal displacement and ground uplift. The research study concludes that support resistance is critical in limiting the movement of the tunnel’s bottom arch and impacting the stability of the surrounding rock. Additionally, the extent of rock damage during the excavation of expansive soft rock tunnels is found to be minimal. Overall, this study provides valuable insights into the processes of soft rock tunnel excavation and contributes to the development of more efficient support systems.

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Section: Introductionmentioning

confidence: 99%

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Ma,

Chen,

Chang

et al. 2024

Materials

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“…Multiple factors influencing the earth pressure around the tunnel lining, including the engineering geology, the depth of the overburden, the ground water level, the excavation method, interactions between the lining and soil and the construction behaviour, operational parameters, and grouting parameters, have been indicated by many scholars [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Zhou

2020

Advances in Civil Engineering

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Accurately evaluating the ground pressure on the tunnel lining greatly helps the structure design of a tunnel. In this study, the earth pressure and water pressure on the tunnel lining of four cross sections of a metro tunnel were measured and analyzed and then compared with the theoretical values. Results show that the values and distribution of observed ground pressure acting on the lining are different for different overburden depths. The water pressure measured on-site is approximately equal to the theoretical hydrostatic pressure. The water pressure acting on the shield tunnel lining does not fluctuate with the shield tunnel excavation. The maximum ground pressure was measured in the process of backfill grouting, and the maximum values are approximately larger than 30% of the stable value of the measured pressure. For a shield tunnel under a river with deep water, the water pressure on the lining is dominant and the observed total ground pressure is nearly equal to the water pressure. The findings presented in this paper can provide a reference for the structure design of similar tunnel projects.

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“…In addition, currently, there are very few reports about the in-situ monitoring on the internal forces of tunnel linings under the swelling effect. Through the numerical modelling, Wang et al built a two-dimensional (2D) load-structure model for the structural numerical analysis of the mechanical behaviors of shield tunnel linings [13]. Similarly, Fang et al adopted the same model to study the axial forces and bending moments of shield tunnel linings affected by expansive soils underlying sandy pebble layers [14].…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Simulation of Shield Tunnel Subjected to Swelling Effect Considering the Nonlinearity of Joint Bending Stiffness

Yan

Chuan

et al. 2019

Period. Polytech. Civil Eng.

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In this paper, the authors developed a three dimensional shell-spring numerical model of a shield tunnel, in which the elastic shell elements were adopted to model the segments and the spring models were used for the simulation of the segmental joints. The highlight of this research is that the non-linearity of the joint bending stiffness was taken into consideration, which was first determined through the numerical simulation by using a refined 3D continuum model of the segment-joint structure. The automatic iteration of the joint bending stiffness was achieved through programming with the ANSYS ADPL software. Based on a specific engineering example, a 3D continuum-shell-spring model was established to analyze the internal forces of shield tunnel segmental linings subject to swelling soils. The developed numerical model and its application in the analysis of the internal forces of shield tunnel segmental linings in swelling ground will provide useful reference and guidance for the numerical calculation in similar engineering projects in future.

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In-site experiments on the swelling characteristics of a shield tunnel in expansive clay: A case study

Cited by 12 publications

References 18 publications

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

3D Numerical Simulation of Shield Tunnel Subjected to Swelling Effect Considering the Nonlinearity of Joint Bending Stiffness

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