Improved analytical method for evaluating the responses of a shield tunnel to adjacent excavations and its application

Liu, Jianwen; Shi, Chenghua; Lei, Mingfeng; Cao, Chengyong; Lin, Yuexiang

doi:10.1016/j.tust.2020.103339

Cited by 51 publications

(21 citation statements)

References 23 publications

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“…Because of the excavation of the foundation pit in the upper part of tunnel, the vertical additional stress suffered by the tunnel is mainly caused by the unloading at the bottom of the foundation pit, the unloading effect of the lateral soil of the foundation pit has little effect on the uplift deformation of the tunnel, which can be referenced to the existing research. [22,23,26] Based on Mindlin's formulas, the unloading stress q(x), which caused by rectangular excavation acting upon the centerline of tunnel, can be expressed as…”

Section: Unloading Stress Caused By Overlying Excavationmentioning

confidence: 99%

“…In this condition, the Euler-Bernoulli beam is not suitable to estimate the tunnel behaviors because it cannot consider the shearing effect of tunnel. To overcome this shortcoming, some investigations, [22,[25][26][27] ) simplified the tunnel as a Timoshenko beam [28] to take the shearing effect into consideration. On the other hand, Winkler [29] and Pasternak [30] foundation models have been widely used to evaluate the interaction between soil and structure.…”

Section: Introductionmentioning

confidence: 99%

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Simplified method for evaluating the response of existing tunnel induced by adjacent excavation

Feng

Liang³

et al. 2022

Num Anal Meth Geomechanics

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Adjacent excavation may have a negative influence on the existing tunnel underneath. Thus, it is important to evaluate the response of the tunnel due to adjacent excavation. However, there is little report about using the Kerr foundation model to simulate the tunnel‐soil interaction. Meanwhile, the Timoshenko beam, which can take the tunnel shearing effect into consideration, is more suitable to estimate the behavior of the tunnel. To simulate the interaction between soil and tunnel, the existing tunnel is simplified as a Timoshenko beam lying on the Kerr foundation model, and a simplified theoretical method is proposed to calculate the response of the existing tunnel induced by adjacent excavation. The proposed method is validated by two field case studies. Results indicate that the predictions given by the proposed method show great agreement with field measurements and it is more accurate to evaluate the tunnel‐soil interaction compared with the previous method. The further parametric study shows that the relative position between excavation and tunnel, the ground Young's modulus, the depth of existing tunnel centerline, and length and width of excavation are both significant factors governing the tunnel response induced by adjacent excavation, while the influence of tunnel shear stiffness and skew between tunnel and excavation are slight. The proposed method can be applied to predict the potential risk of existing tunnels induced by adjacent excavation in relevant engineering projects.

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Section: Unloading Stress Caused By Overlying Excavationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simplified method for evaluating the response of existing tunnel induced by adjacent excavation

Feng

Liang³

et al. 2022

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

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“…ese equations are the prediction model and can be written as f i () for the convenience of expression shown in the following equation: F i � f i P i 􏼁. (10) In fact, because of the unpredictability of the ground conditions and the uncertainty of the parameters in the prediction model f i (), it also needs to be updated in time to ensure the accuracy of the displacement prediction. ese updates can be accomplished by the matrix X, which includes l ground mechanical parameters and other coefficients in the prediction model f i ().…”

Section: 1mentioning

confidence: 99%

“…Different from ground surface structures, the applied load of tunnels is hard to be accurately estimated due to the complexity of the mechanical properties of soils [8], thus making the mechanical responses of tunnels ambiguous. Currently, subways are being constructed in all regions of China, from the north [9] to the south [10] and from the west [11] to the east [12]. e soil conditions vary from place to place, thus resulting in different mechanical responses.…”

Section: Introductionmentioning

confidence: 99%

Movements and Its In‐Process Control of Ground and Built Structures due to Tunnelling in Urban Areas

Zhang

Cao

Fei

et al. 2022

Advances in Civil Engineering

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Tunnelling-induced environmental responses including ground movements and deformation of the environmental structures are the two prominent issues needed to be carefully disposed in urban areas. This paper tries to develop a theoretical framework to evaluate and control the environmental deformation to avoid two disasters including ground collapse and structural failure. According to the mechanical responses of the ground due to tunnelling, the urban ground in China can be roughly divided into three types including composite multilayered ground, highly water-bearing ground, and mixed rock ground. The displacements of ground and environmental structures due to tunnelling in multilayered ground are emphatically discussed in view of its largest proportion distribution. The cumulative and mutational characteristics of the displacements are considered, which can be the main basis for distinguishing the occurrence of two types of disasters. Based on the development of the displacements, the three-stage evolution model of disaster is established. Combined with the existing displacement and degeneration of the ground and structures and the safety factor, the displacement control standards can be eventually determined. The theoretical framework of in-process control is established which is based on the prediction, measurement, and control standards of the displacements. In the framework, the prediction model can be modified in time, and the tunnelling parameters can be adjusted synchronously. The current research is successfully applied in the Qinghuayuan Tunnel Project.

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“…As for the underpass construction of nearby existing sensitive buildings, domestic and foreign scholars have carried out a wealth of research work in the field monitoring [3,4], numerical simulation [1,5,6], theoretical analysis [7][8][9][10], and other aspects. For example, Wang [11] studied the advantages and disadvantages of the underpassing scheme of jacking frame culvert and the underpassing scheme of shallow-buried tunnels in the project of Shanxi Yushen Expressway underpassing the Qin Great Wall ruins and pointed out that the shallow-buried underexcavation method can effectively restrain the deformation of the surrounding rock.…”

Section: Introductionmentioning

confidence: 99%

The Construction Countermeasures of Shallow‐Buried Small Spacing Tunnel Undercrossing Cultural Relic Buildings: A Case Study

Wan

Shen

Zhang

et al. 2021

Advances in Civil Engineering

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Based on the background of the reconstruction project from Changqing Chenzhuang-Pingyin section of G220 east-deep line in China, a special tunnel structure and construction plan was carried out according to the construction measures of the shallow-buried small spacing tunnel passing underneath cultural relic buildings, and a comprehensive deformation control scheme of “CRD construction method single-arm excavation + surface grouting prereinforcement + advanced large pipe shed presupport” was put forward. The results of numerical simulation and on-site construction monitoring showed that the overall deformation of aqueduct foundation generally increases first, then decreases and increases again, and finally tends to be stable. The effects of surface grouting prereinforcement and advance large pipe shed presupport are obvious. The comprehensive deformation control scheme can ensure the safety of the existing construction and meet the safety prevention and control requirements.

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Improved analytical method for evaluating the responses of a shield tunnel to adjacent excavations and its application

Cited by 51 publications

References 23 publications

Simplified method for evaluating the response of existing tunnel induced by adjacent excavation

Simplified method for evaluating the response of existing tunnel induced by adjacent excavation

Movements and Its In‐Process Control of Ground and Built Structures due to Tunnelling in Urban Areas

The Construction Countermeasures of Shallow‐Buried Small Spacing Tunnel Undercrossing Cultural Relic Buildings: A Case Study

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