Longitudinal structural modelling of shield tunnels considering shearing dislocation between segmental rings

Wu, Huai-Na; Shen, Shui‐Long; Liao, Shaoming; Yin, Zhen‐Yu

doi:10.1016/j.tust.2015.08.001

Cited by 277 publications

(87 citation statements)

References 28 publications

(22 reference statements)

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“…Usually, the lining in the metro tunnel consists of six segments, which means there are a lot of joints throughout the tunnel. Field investigations have found that groundwater leakage occurred frequently in joints and cracks in segments and grouting holes [44][45][46]. During the initial period of construction, the volume of groundwater leakage and the deformation of the tunnel can be ignored.…”

Section: Long-term Drawdown Of Groundwatermentioning

confidence: 99%

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Ren

2016

Sustainability

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133

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Abstract:It has been observed that in the urban center of Shanghai, land subsidence has accelerated, and the groundwater level has continued to drop even though the net withdrawn volume (NWV) of groundwater has remained unchanged since 1980. An analysis of monitoring data shows that drawdown of the groundwater level is one of the factors that have influenced land subsidence since 1980. The NWV of groundwater in urban areas, however, is not the critical factor controlling the drawdown of the groundwater level. Since the 1980s, there have been many underground works constructed in the unique strata of Shanghai, which has an interlayered structure known as a multi-aquifer-aquitard system (MAAS). Investigation into land subsidence caused by urban construction is now receiving much attention. Based on the principle of a strategic environmental assessment (SEA) for sustainable urban development, this paper presents a discussion and analysis of the factors which can influence the development of land subsidence during continued urbanization in Shanghai. The main factors include the additional loading caused by the construction of structures, the cut-off effect due to construction in aquifers, the drawdown of groundwater level caused by leakage into underground structures, and the decrease of groundwater recharge from neighboring zones. SEA is recommended for the future development of Shanghai.

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Section: Long-term Drawdown Of Groundwatermentioning

confidence: 99%

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Ren

2016

Sustainability

Self Cite

133

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“…Shen et al [4] reported on a field test located near the Huangpu River in the Pudong New Development Area, China. In this field test, the single fluid system was used for horizontal jet grouting, where the metro tunnel stating shaft was protected by the excavation (Wu et al, 2015c;2016;2017a, b) [19,47,48]. Figure 8 shows the geotechnical profile and soil properties for this case history.…”

Section: Methods Verificationmentioning

confidence: 99%

Simple Method to Predict Ground Displacements Caused by Installing Horizontal Jet-Grouting Columns

Wang

Shen

Cheng

2018

Mathematical Problems in Engineering

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During the horizontal jet grouting in soft ground, injection of large volumes of water and grout into the soil can lead to significant ground displacements. A simple method is proposed in this paper to predict the ground displacements caused by installing horizontal jet-grouting columns. The process of installing a horizontal column is simplified as the expansion of a cylindrical cavity with a uniform radial stress applied at plastic-elastic interface in a half plane. In this study, the analytical solution is adopted to calculate the deformation induced by the expansion of a cylindrical cavity. Considering the main jetting parameters (jetting pressure of the fluid, flow rate of the fluid, and withdrawal rate of the rod) and the soil properties (stiffness of the surrounding soil), an empirical equation to estimate the radius of plastic zone is developed. Two field tests are carried out in Shanghai, China, to verify the correctness and applicability of the proposed method. Comparisons between the predicted and measured values indicate that the proposed method can provide a reasonable prediction. The proposed simple method can be recommended as a useful tool for the design of ground improvement by means of horizontal jet grouting.

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“…Additionally, in the hilly region, the bedrock fissure water widely distributed across an area of 743.3 km 2 usually has a very high piezometric level [52][53][54][55][56][57]. It is worth noting that the well-developed river network combined with the high precipitation provides abundant water resources that may worsen the geological conditions during shield tunneling [58][59][60][61][62][63][64][65][66].…”

Section: Hydrogeology and Engineering Geology Of Guangzhoumentioning

confidence: 99%

Fractal Prediction of Grouting Volume for Treating Karst Caverns along a Shield Tunneling Alignment

et al. 2017

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Karst geology is common in China, and buried karst formations are widely distributed in Guangdong province. In the process of shield tunneling, the abundant water resources present in karst caverns could lead to the potential for high water ingress, and a subsequent in situ stress change-induced stratum collapse. The development and distribution of karst caverns should therefore be identified and investigated prior to shield tunnel construction. Grouting is an efficient measure to stabilize karst caverns. The total volume of karst caverns along the shield tunneling alignment, and its relationship with the required volume of grouts, should be evaluated in the preliminary design phase. Conventionally, the total volume of karst caverns is empirically estimated based on limited geological drilling hole data; however, accurate results are rarely obtained. This study investigates the hydrogeology and engineering geology of Guangzhou, the capital of Guangdong province, and determines the fractal characteristics of the karst caverns along the tunnel section of Guangzhou metro line no. 9. The karst grouting coefficients (V R ) were found to vary from 0.11 in the case of inadequate drilling holes to 1.1 in the case where adequate drilling holes are provided. A grouting design guideline was furthermore developed in this study for future projects in karst areas.

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Longitudinal structural modelling of shield tunnels considering shearing dislocation between segmental rings

Cited by 277 publications

References 28 publications

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Analysis of Factors in Land Subsidence in Shanghai: A View Based on a Strategic Environmental Assessment

Simple Method to Predict Ground Displacements Caused by Installing Horizontal Jet-Grouting Columns

Fractal Prediction of Grouting Volume for Treating Karst Caverns along a Shield Tunneling Alignment

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