An Investigation into the Tunnel‐Soil‐Pipeline Interaction by In Situ Measured Settlements of the Pipelines

Li, Xinggao; Wang, Ting; Yang, Yi

doi:10.1155/2020/8850380

Cited by 5 publications

(5 citation statements)

References 30 publications

(35 reference statements)

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“…Huangzhuang Station of Beijing Metro is a cross interchange station of Metro Line 4 and Line 10, and the two stations are obliquely intersected by the PBA method of construction 36 , 37 ; for the ϕ800 cast iron pipes above the station, the settlement is predicted using this paper's model and the calculated ground settlement model, and the predicted curves are plotted together with the measured data in Fig. 14 .…”

Section: Project Applicationsmentioning

confidence: 99%

Modified stochastic medium prediction model for the deformation response of concealed underground stations under existing pipelines

Zhang

Tong

et al. 2023

Sci Rep

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The underground pipeline network in the city is so intertwined that the concealed excavation of a metro station inevitably leads to a series of underground pipelines, causing settlement deformation and further risk of leakage. The existing theoretical methods for analysing settlement deformation are mostly for circular chambers, whereas metro stations have a nearly square cross-sectional form and different construction methods are very different, which have a greater impact on the deformation of the overlying pipelines. In this paper, based on the random medium theory and Peck's formula, the improved random medium model for predicting ground deformation is modified, the correction coefficients λ and η for the influence of different construction methods are proposed, the prediction model of underground pipeline deformation under different construction methods is obtained, and the numerical models of four work methods commonly used in urban tunnel construction: pillar hole method, side hole method, middle hole method and Pile-Beam-Arch (PBA) method are constructed through simulation, and the mathematical analysis software was used to fit the results to the model and obtain the range of correction coefficients λ and η for each of the four methods, and the accuracy and applicability of the theoretical model was verified by combining with actual engineering cases. The influence on the overlying pipes is in descending order: side hole method, pillar hole method, middle hole method and PBA method. The theoretical model provided in this paper for predicting the deformation of pipes in any overlying strata of the tunnel is well suited to the actual project and has a high degree of correlation with the measured results.

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Section: Project Applicationsmentioning

confidence: 99%

Modified stochastic medium prediction model for the deformation response of concealed underground stations under existing pipelines

Zhang

Tong

et al. 2023

Sci Rep

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show abstract

“…During the construction process, the formation loss is transmitted upward to cause the deformation of the surface and buried pipelines. In this process, the pressure of the overlying soil of the pipeline and the emptying of the underlying soil cause the deformation and overall displacement of the pipeline [23]. At the same time, the existence of the pipeline as a "beam" in the soil also reduces the settlement of the ground surface.…”

Section: Analysis Of the Ground Settlements And Thementioning

confidence: 99%

The Ground Settlement and the Existing Pipeline Response Induced by the Nonsynchronous Construction of a Twin‐Tunnel

Sun

Rong

Wang

et al. 2021

Advances in Civil Engineering

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Shielding tunnel construction always has negative impacts on the surrounding buildings. Because of repeated disturbances caused by the construction, more attention should be paid to the impacts of the nonsynchronous construction of a twin-tunnel. In this research, a three-dimensional model was established to simulate the construction process of a twin-tunnel in a section of the Hefei No. 4 metro line, and the calculation results were validated with the measured settlement data. Based on the model, the ground settlement and the existing pipeline responses were studied in detail. The results showed that, after the first tunnel (FT) construction, the settlement curves conformed to a Gaussian distribution. Additionally, after the second tunnel (ST) construction, the final settlement curves were no longer completely symmetrical. The influences of the twin-tunnel space and the pipeline-soil relative stiffness on the settlements were further studied. The results showed that the final settlement curves of the ground surface and the pipeline were mainly W-shaped, U-shaped, and V-shaped. As the twin-tunnel space increased and the pipeline-soil relative stiffness decreased, the settlement curve gradually changed from V-shaped to W-shaped. C was defined as the ratio of two maximum settlements in the W-shaped settlement curve. As the space increased, C started to decrease from 1 and then increased to 1.

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“…In numerical studies, the parameters of the numerical models are difficult to determine accurately and conform to reality. Field monitoring remains a reliable method for comprehending the interaction [24][25][26]. Although scholars have conducted a lot of research on the newly constructed tunnels crossing underground pipelines, existing research has mostly simplified the tunnel construction process, which cannot truly reflect the impact of such crossing engineering on gas pipeline deformation.…”

Section: Introductionmentioning

confidence: 99%

Gas Pipeline Response to Underlying Straight-Wall Arch Tunnel Construction

Zhang,

Liang,

Huang

et al. 2023

Buildings

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Straight-wall arch cross-sections are usually designed at the entrance and exit tunnels of subway stations, and dense underground pipelines often cross these cross-sections at close range. Among these pipelines, gas pipelines have the highest risk level. Therefore, it is necessary to reduce the deformation influence of underground crossing construction on existing gas pipelines. Based on the No. 2 entrance and exit tunnel project of Zhongshan Road Station of the Hohhot Metro Line 2, using the methods of numerical simulation and field monitoring, this paper has particularly investigated the influence of straight-wall arch tunnel construction by applying the pre-grouting reinforcement and double-side drift method to the deformation of existing gas pipelines. The research results show that the double-side drift method is an efficient and sustainable construction method for straight-wall arch tunnels, which can effectively reduce the crossing construction disturbance to overlying gas pipelines. The measured maximum settlement of the existing gas pipeline is 18.46 mm, and the maximum settlement of the new tunnel vault is 22.86 mm, with both values satisfying the requirements for deformation control. The simulation results are consistent with the measured results of gas pipeline settlement. This study shows that the safety control scheme employed in the field with a tunnel excavation step of 6 m, stratum reinforcement with upper semi-section grouting, and a grouting reinforcement range of 2.0 m is reasonable and effective. This scheme can provide a reference for the deformation control of similar underground gas pipelines in the crossing construction of straight-wall arch tunnels at close range.

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An Investigation into the Tunnel‐Soil‐Pipeline Interaction by In Situ Measured Settlements of the Pipelines

Cited by 5 publications

References 30 publications

Modified stochastic medium prediction model for the deformation response of concealed underground stations under existing pipelines

Modified stochastic medium prediction model for the deformation response of concealed underground stations under existing pipelines

The Ground Settlement and the Existing Pipeline Response Induced by the Nonsynchronous Construction of a Twin‐Tunnel

Gas Pipeline Response to Underlying Straight-Wall Arch Tunnel Construction

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