An analysis of the ground deformation caused by shield tunnel construction combining an elastic half-space model and stochastic medium theory

Shi, Chenghua; Cao, Chengyong; Lei, Mingfeng

doi:10.1007/s12205-016-0804-y

Cited by 49 publications

(21 citation statements)

References 20 publications

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“…(4) After the aggregated fuzzy numbers are determined, the centroid index method (equation (13)) is used to handle the fuzzy numbers and obtain the fuzzy probability score (FPS) [36]:…”

Section: Confirming Failure Occurrence Probabilitymentioning

confidence: 99%

“…In contrast, analytical methods make reasonable simplifications of rock and soil to consider them as a medium with certain physical and mechanical properties and then derive the surface settlement via well-established mathematical models and mechanical theories [1]. e stochastic medium theory considered rock and soil as a "stochastic medium" and regards the surface settlement caused by tunnel excavation as a stochastic process [11][12][13]. Numerical analysis integrates the elastic-viscoplastic theory into numerical calculations and reduces the dimension of the calculations with discrete interpolation and analytic functions [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Predictive Analysis of Settlement Risk in Tunnel Construction: A Bow‐Tie‐Bayesian Network Approach

Zhai

Liu

2019

Advances in Civil Engineering

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A hybrid method consisting of bow-tie-Bayesian network (BT-BN) analysis and fuzzy theory is proposed in this research, in order to support predictive analysis of settlement risk during shield tunnel excavation. We verified the method by running a probabilistic safety assessment (PSA) for a tunnel section in the Wuhan metro system. Firstly, we defined the “normal excavation phase” based on the fuzzy statistical test theory. We eliminated the noise records in the tunnel construction log and extracted the occurrence probability of facility failures from the denoised database. We then obtained the occurrence probability of environmental failures, operational errors, and multiple failures via aggregation of weighted expert opinions. The expert opinions were collected in the form of fuzzy numbers, including triangular numbers and trapezoidal numbers. Afterwards, we performed the BT-BN analysis. We mapped the bow-tie analysis to the Bayesian network and built a causal network PSA model consisting of 16 nodes. Causes of the excessive surface settlement and the resulting surface collapse were determined by bow-tie analysis. The key nodes of accidents were determined by introducing three key measures into the Bayesian inference. Finally, we described the safety measures for the key nodes based on the PSA results. These safety measures were capable of reducing the failure occurrence probability (in one year) of excessive surface settlement by 66%, thus lowering the accident probability caused by excessive surface settlement.

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“…(4) After the aggregated fuzzy numbers are determined, the centroid index method (equation (13)) is used to handle the fuzzy numbers and obtain the fuzzy probability score (FPS) [36]:…”

Section: Confirming Failure Occurrence Probabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predictive Analysis of Settlement Risk in Tunnel Construction: A Bow‐Tie‐Bayesian Network Approach

Zhai

Liu

2019

Advances in Civil Engineering

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“…Large-scale settlement remarkably challenges shield tunnel construction. Therefore, the influence of shield tunneling on strata under the condition of upper-soft and lower-hard composite strata should be investigated [29][30][31][32][33]. Deng et al [34] took Shenzhen Metro Line 2 as an engineering example, conducted a construction risk analysis under the conditions of upper-soft and lower-hard composite strata, and obtained the specific tunneling parameters through slag soil improvement and tool change with pressure; consequently, they provided valuable data for the theoretical study of shield tunneling under complex geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of shield tunnel construction on ground surface settlement under the condition of upper-soft and lower-hard composite strata

Lv¹,

Li²,

Fu³

et al. 2020

J. vibroeng.

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Taking the shield tunnel project of Guangzhou Metro Line 8 from Tongdewei Station to Shangbu Station as the research background, using the research method of finite element simulation and site monitoring, this paper analyses the influence rules of shield tunneling on ground subsidence under the condition of different hard rock height ratios. The research results show that in the process of crossing different hard rock height ratio composite stratum, as the hard rock height ratio decreases, the value of ground settlement decreases and settlement tank becomes shallow. The surface subsidence in different hard rock height ratio strata is obviously different, and the maximum difference is about 8.6 mm; The influence of the hard rock height ratio on the surface longitudinal settlement is mainly reflected in the position change of the beginning and the end of the settlement. With the increase of the hard rock height ratio, the shield construction reduces the amount of the surface longitudinal settlement and its influence range; Through the research, it is found that the hard rock height ratio in the 0-0.2 and 0.5-1 is the sensitive interval, and the settlement value in these two hard rock height ratio interval varies greatly. It is necessary to pay attention to the uneven settlement of the ground surface caused by shield construction in the sensitive hard rock height ratio interval. The research results of this paper can provide reference value for similar shield construction in upper soft and lower hard composite stratum.

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“…Subsequently, the stochastic medium theory was introduced by Chinese scholars into the study of predicting surface settlement caused by urban subway construction [33,34]. Compared with the Peck method, stochastic medium theory can be applied to a shallow-buried tunnel and various excavation sections, which has more advantages [35,36]. However, its calculation method is complicated, so it is difficult to be widely used in engineering.…”

Section: Introductionmentioning

confidence: 99%

A New Modified Peck Formula for Predicting the Surface Settlement Based on Stochastic Medium Theory

Song

Tian

Zhang

2019

Advances in Civil Engineering

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Peck method and stochastic medium method are the two most commonly used methods to estimate surface settlement caused by tunnel excavation. However, the Peck method was not suitable for a shallow-buried tunnel, and the calculation process of the stochastic medium theory was complicated. To solve this problem, in this paper, a simple and accurate prediction approach for surface settlement was obtained by improving the Peck method based on the basic idea of stochastic medium theory. In detail, the over-excavation area of the tunnel was divided into n independent units, and the surface settlement caused by the collapse of each unit was calculated, respectively. Then, the total surface settlement can be obtained by superimposing surface settlement induced by each unit. Taking the shallow-buried section of Mulingguan tunnel entrance as a case, the surface settlement calculated by the modified Peck formula and original Peck formula was compared with the observed data, respectively. The comparison results indicated that the surface settlement calculated by the modified Peck formula is closer to the observed data than that calculated by the original Peck formula in the calculation process of surface settlement of shallow-buried tunnel. The table of recommendation for the number of units can be obtained by a discussion of reasonable n values. Finally, the difference between the original Peck formula and the modified Peck formula was analysed, and the results showed that the change rule of the surface settlement is consistent under the tunnel depth, internal friction angle, and ground loss of the tunnel. However, the calculation error of the surface settlements calculated by the original Peck formula is more significant than that calculated by modified Peck formula under the tunnel diameter ratio being less than 1.75. The modified Peck formula is more suitable for calculating the surface settlement under internal angle friction being less than 20° or greater than 40°. The research results expand the scope of application of the original Peck formula and enrich the calculation approach of surface settlement induced by underground excavation in tunnel construction.

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An analysis of the ground deformation caused by shield tunnel construction combining an elastic half-space model and stochastic medium theory

Cited by 49 publications

References 20 publications

Predictive Analysis of Settlement Risk in Tunnel Construction: A Bow‐Tie‐Bayesian Network Approach

Predictive Analysis of Settlement Risk in Tunnel Construction: A Bow‐Tie‐Bayesian Network Approach

Influence of shield tunnel construction on ground surface settlement under the condition of upper-soft and lower-hard composite strata

A New Modified Peck Formula for Predicting the Surface Settlement Based on Stochastic Medium Theory

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