Equivalent numerical simulation method and application in karst-induced collapse of overlying sandy stratum

Wang, Xianming; Wang, Shimin; Peng, Xiaoyu; Ma, Tianyu; Chen, Bing

doi:10.1016/j.engfailanal.2022.106280

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…When the load is not taken into account, the soil deformation value is generally less than 6 mm. In the absence of artificial treatment, karst collapse is further aggravated [9] . In the wet season, from July to August every year, the soil will float up, and the floating value is less than 4 mm.…”

Section: Model Identificationmentioning

confidence: 99%

Numerical Simulation of Karst Collapse in Qingling Town, Wuhan

Chen¹,

Cao

2023

J. Phys.: Conf. Ser.

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With background information on the geological conditions of Fenghuo village, Qingling town, Wuhan, based on Terzaghi consolidation theory and GMS software, a hydrodynamic-mechanics coupling model was established. On the basis of simulating the groundwater flow field by GMS software, a mechanical calculation program was developed, and the coupling simulation of hydrodynamic mechanics was achieved. The results showed that the stress state, vertical deformation, and damage of soil are closely related to the underground water flow. The soil pressure value and effective stress value are relatively low from July to August every year. It is the result of buoyancy produced by groundwater. Soil settlement generally occurs in the dry season. When the load is not considered, the deformation value of soil settlement is generally less than 6 mm. In the wet season from July to August every year, the soil will float up, and the floating value is less than 4 mm. The groundwater table changes frequently, and the destruction around the cave body eventually leads to karst collapse.

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Section: Model Identificationmentioning

confidence: 99%

Numerical Simulation of Karst Collapse in Qingling Town, Wuhan

Chen¹,

Cao

2023

J. Phys.: Conf. Ser.

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“…Te above studies show that most of the studies have focused on cavern solutions, and relatively few studies have been conducted on the construction response characteristics of huge cavern backflling [40][41][42][43][44][45][46][47][48][49][50][51]. Although Chen et al [52] studied the stress distribution and deformation of surrounding rock in their numerical simulation of a large karst cave in front of the Huaguoshan Tunnel.…”

Section: Introductionmentioning

confidence: 99%

Study on Construction Response Characteristics of Large Cross-Section Tunnel Crossing Huge Karst Cave Backfill

Chen

Cai

Zhang

et al. 2023

Shock and Vibration

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The existence of giant karst cave can cause collapse and water inrush hazards during the excavation of the karst tunnel, causing serious economic losses. In this paper, based on the FEA software MIDAS, a numerical simulation model for the backfilling of a large karst cave through a large cross-section tunnel was established. The distribution characteristics and change rules of the displacement field, stress field, horizontal support stress, and plastic zone of the tunnel surrounding rock and backfill were explored. The first stage of tunnel excavation leads to a sharp increase in the displacement of the tunnel’s surrounding rock and the deterioration of the plastic zone, which should be strengthened and monitored. The tunnel arch, waist, and wall footing areas were prone to stress concentration. The two layers of horizontal support force show a certain regularity, showing a sharp increase and a gradually smooth growth trend. Meanwhile, the site monitoring results for arch settlement and horizontal convergence of the mega cavern tunnel were analyzed. The results show that the numerical calculation results were in good agreement with the values of site monitoring data. The average errors of final crown settlement and horizontal convergence were 8.6% and 15.9%, respectively, which verified the correctness of the numerical modeling method. This project can provide reliable experience for the construction of similar large cavern tunnels.

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“…Many assessment models were proposed to evaluate the stability of tunnels in karst regions. Based on the prediction of karst characteristics and the mechanism of karst-induced collapse, some assessment models were successfully applied in tunneling projects [11][12][13], such as the Wuhan Metro Line 11 and Doupengshan tunnel. Wang et al [14] put forward a risk assessment model of water inflow and inrush based on 13 indicators, and utilized it to evaluate the construction of the Qiyueshan Tunnel.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response and Damage Analysis of Shield Tunnel with Lateral Karst Cavity under Oblique SV Waves

Meng

Zhou

2023

Buildings

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The dynamic effects of the lateral karst cavity on the shield tunnels under different incident angles of seismic waves are investigated by numerical analysis in this paper, based on the Dalian Metro Line 5 project. The viscous-spring artificial boundary is applied and verified to guarantee the accuracy of seismic input. A simplified finite element model of shield tunnel is established based on the equivalent bending stiffness model. This paper compares the seismic response characteristics and damage states of the tunnel under different incident angles by analyzing the axial deformation, stress distribution, and damage severity, respectively. A new damage state classification criterion is proposed by introducing the relationship between cracks and tensile damage. The results show that the tunnel’s affected scope by the lateral karst cavity is twice the cavity diameter. As the incident angle increases, the tunnel’s displacement and stress increase and show the structural spatial difference, and the tunnel’s damage state is increasingly severe. The displacement and stress reach the max values when the incident angle is 30°. The cracks along the axial direction extend on the outer surface of the vault and bottom, and the crack width is greater than 0.2 mm, as that angle is 30°. The damage severity at the tunnel’s central zone is minimum along axial directions during seismic action, while the damage concentration occurs on the bottom at the end of seismic. The lateral karst cavity plays an energy dissipation and vibration reduction role to a certain extent, but it also aggravates the local damage. This paper can serve as a reference for the seismic design of tunnels in karst regions.

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Equivalent numerical simulation method and application in karst-induced collapse of overlying sandy stratum

Cited by 8 publications

References 15 publications

Numerical Simulation of Karst Collapse in Qingling Town, Wuhan

Numerical Simulation of Karst Collapse in Qingling Town, Wuhan

Study on Construction Response Characteristics of Large Cross-Section Tunnel Crossing Huge Karst Cave Backfill

Seismic Response and Damage Analysis of Shield Tunnel with Lateral Karst Cavity under Oblique SV Waves

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