Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Li, Peng Fei; Zhao, Yong; Zhou, Xiaojun

doi:10.1016/j.tust.2015.10.009

Cited by 133 publications

(34 citation statements)

References 20 publications

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“…e maximum settlement of the tunnel foundations is 7.3 mm according to the monitoring point 3-4, and the settlement of the other monitoring points is less than 6 mm. e settlement of most measuring points increases rapidly during the early stages and then tends to gradually stabilize over a period of approximately 50 days, which accords with the results reported in [57][58][59]. Some monitoring points exhibit some swelling deformation in the early stages.…”

Section: Monitoring Pointssupporting

confidence: 90%

Displacement and Stress Characteristics of Tunnel Foundation in Collapsible Loess Ground Reinforced by Jet Grouting Columns

Liu

et al. 2018

Advances in Civil Engineering

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Collapsible loess tunnel foundation reinforcement is a new challenge in the construction process of tunnel engineering. According to the field displacement and stress monitoring of the Fujiayao loess tunnel, this paper investigates the reinforcing effect of a high-pressure jet grouting pile on a collapsible loess tunnel foundation in the deep large-span tunnel. The field monitoring method was employed to address the performance of tunnel foundation settlement, additional stress, earth pressure, rock pressure, etc. The results indicate that the stress on the pile tops and the earth pressure between piles increase gradually over time in two stages: stress increases rapidly in the first 45 days and, after this period, stress tends to gradually stabilize. Further, stress increases uniformly with the distance from the centerline of the tunnel, and the rock pressure of the tunnel sidewalls tends to be stable within two months of being constructed. Additional stress on the tunnel foundation increases linearly with time, and it is uniformly distributed in the vertical and horizontal directions of the tunnel section. Settlement of the tunnel foundation also gradually increases with time, and it tends to be stable at 50 days from the time of construction. Additionally, the settlements of different monitoring points are similar at the same depth. The research results will further improve the theoretical knowledge of tunnel bottom reinforcement in the loess tunnel, which not only can effectively guide the design and construction of the loess tunnel and reduce disease treatment cost but also can provide the necessary basic research data and scientific theoretical basis for revision of the corresponding specifications of highway tunnels and railway tunnels.

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Section: Monitoring Pointssupporting

confidence: 90%

Displacement and Stress Characteristics of Tunnel Foundation in Collapsible Loess Ground Reinforced by Jet Grouting Columns

Liu

et al. 2018

Advances in Civil Engineering

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“…e data of the 22 tunnels used in this paper were from the papers of Zhao et al [51], Hu [36], and Li et al [26]. Table 1 and Figure 1 showed an overview of the part loess tunnel, which was published on journals or monographs publicly.…”

Section: Methodsmentioning

confidence: 99%

“…Deformation has four characteristics: scientific, timeliness, reliability, and convenience, and is widely used to evaluate tunnel stability and ensure construction safety [18][19][20][21][22][23][24][25]. e deformation of surrounding rock in loess is mainly affected by water content, cover depth, construction method, and construction procedure [26]. During the tunnel construction in loess ground, the sequential excavation method (SEM) is widely applied to promote the tunnel face stability, such as both-side drift method (BSDM), bench excavation method (BEM), central diaphragm method (CD), and cross diaphragm method (CRD), as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Influence of Cover Depth on Loess Tunnel Deformation in NW China

Lai

et al. 2019

Advances in Civil Engineering

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Loess is a kind of special soil with structure and hydrocollapse behavior; due to the particularity of loess, the deformation regularity of the tunnel in loess shows different characteristics from those in rock. To ensure the safety of construction, crown settlement (CS) and horizontal convergence (HC) are widely used to assess the stability of the tunnel structural system. Based on statistical analysis, this study focused on analyzing the influence of cover depth on the deformation of surrounding rock of loess tunnels by ANOVA, and relationships between them were presented by regression analysis. The achieved results indicated that the influence of cover depth on deformation was not obvious in shallow tunnels, while the cover depth had a significant effect on deformation in deep tunnels. Based on the difference of influence of cover depth on deformation between shallow tunnels and deep tunnels, a method for determining the cover depth threshold (CDT) in the tunnel by statistical analysis was proposed. The horizontal and vertical deformations in shallow tunnels were discrete and obeyed the positive distribution, mainly concentrated within 200 mm. The deformation allowance in shallow tunnels was recommended to be 200 mm. In deep tunnels, as the cover depth increased, the deformation increased linearly, while the CS/HC decreased.

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“…Many sections of the three existing metro lines and some anticipated metro lines are located in the collapsible loess area [3][4][5][6][7][8][9][10][11]. Hence, it is with great significance to investigate the influence of collapsibility induced by foundation soaking on the mechanical properties of the metro tunnel and determine a reasonable foundation noncollapsible depth that could provide guidance for metro tunnel construction [12][13][14][15][16]. The centrifugal model test is a proven approach and has been widely applied in the field of geotechnical engineering testing.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Loess Soaking Induced Impacts on a Metro Tunnel Using a Water Soaking System in Centrifuge

et al. 2019

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The collapsibility is one of the key properties for loess. Harmful impacts on the metro tunnels could be obviously subjected to the soaking collapsibility in collapsible loess. However, loess soaking cannot be effectively modeled by the existing centrifugal test equipment (CTE) due to its inherent limitations. In the present paper, a water soaking system (WSS) was improved based on the existing CTE for simulating various loess soaking conditions. The WSS was made of a water storage subsystem and a water distribution subsystem. Some tests were conducted to show the capability of the improved WSS in centrifugal model tests firstly, then it was used to carry out centrifugal model tests on a metro tunnel under full-range and half-range foundation soaking conditions with different soaking depths. The impacts of various soaking conditions on the mechanical properties of the metro tunnel were discussed in detail.

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Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Cited by 133 publications

References 20 publications

Displacement and Stress Characteristics of Tunnel Foundation in Collapsible Loess Ground Reinforced by Jet Grouting Columns

Displacement and Stress Characteristics of Tunnel Foundation in Collapsible Loess Ground Reinforced by Jet Grouting Columns

Statistical Analysis of Influence of Cover Depth on Loess Tunnel Deformation in NW China

Modeling of Loess Soaking Induced Impacts on a Metro Tunnel Using a Water Soaking System in Centrifuge

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