The use of tunnelling parameters and spoil characteristics to assess soil types: a case study from alluvial deposits at a pipejacking project site

Cheng, Wen-Chieh; Ni, James C.; Huang, Huiwen; Shen, Shui‐Long

doi:10.1007/s10064-018-1288-4

Cited by 44 publications

(14 citation statements)

References 36 publications

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“…According to the corresponding numerical calculation results of the internal force-deformation of the segments and bolts and the different head differences Δh in the water inrush model of the shield at the launching-arrival stage, the relationship between the maximum deformation of the segment and the different water heads Δh on the excavation surface fitted by MATLAB is shown in Figure 17(a). e functional relationship can be expressed as shown in equation (4). Similarly, the relationship between the different head difference Δh of the excavation face and the maximum tensile stress, and the maximum compressive stress of the segment concrete is shown in Figures 17(b) and 17(c).…”

Section: Relationship Between Internal Force-deformation Of Segments mentioning

confidence: 99%

“…In particular, shield construction at the launching-arrival stage has the highest risk. When the shield machine excavates in the upper-soft lower-hard stratum with rich groundwater, it might cause water inrush disasters of different degrees, resulting in subsidence and deformation of the ground, as well as changes in the stress and formation state of the shield tunnel, which significantly affect the service performance of subway tunnels [3,4]. Lee and Ishihara reported that a section of a tunnel in Kaohsiung collapsed owing to uncontrolled leakage of groundwater that spurted from the bottom of the shield tunnel machine face as a result of piping or hydraulic fracturing [5].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Water Inrush from Excavation Surface on the Stress and Deformation of Tunnel‐Forming Structure at the Launching‐Arrival Stage of Subway Shield

Wen

Zhai

et al. 2019

Advances in Civil Engineering

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The launching-arrival stage of the shield is the most dangerous construction stage in subway construction. During the conversion process of the soil and air medium in the shield machine, water inrush at the excavation surface often occurs because of the effect of groundwater. Previous research has focused on the overall stress and deformation of existing tunnels caused by water inrush from the excavation face of the shield machine excavation stage. However, the stress and deformation states of the segments and anchors at different assembly locations of the tunnel, as well as the interaction between the soil reinforcement region and the segments and anchors in the launching-arrival stage have not been considered in previous studies. In this study, the inrush model of the launching-arrival stage of the subway shield was established by utilizing the equivalent refinement modeling technology and ABAQUS simulation analysis with consideration of the fluid-solid coupling effect of water and soil to study the influences of different water head differences on the mechanical and deformation properties of segments and anchors in shield construction under the conditions of water inrush on the excavation surface. The results showed that the water inflow from the tunnel excavation surface caused significant surface subsidence at the tunnel portal, vertical convergence at the cross section of the shield tunnel, and significant increases in the axial and shear forces on the bolt. In addition, based on the existing subway regulation, combined with the simulation results of soil reinforcement measures at different depths, the emergency control criterion for controlling water inrush on the excavation surface was established by using the depth of soil reinforcement. The minimum depth of the reinforced soil from the ground surface at 15 m is recommended to ensure construction safety of the subway shield at the launching-arrival stage.

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Section: Relationship Between Internal Force-deformation Of Segments mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Water Inrush from Excavation Surface on the Stress and Deformation of Tunnel‐Forming Structure at the Launching‐Arrival Stage of Subway Shield

Wen

Zhai

et al. 2019

Advances in Civil Engineering

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“…When highway embankments are constructed on alluvial deposits, the soft soils often bear intolerably large settlements or fail due to insufficient bearing capacity. erefore, a variety of methods have been used to solve these problems [14][15][16][17][18]. Such reinforcement methods include jet grouting [2,[18][19][20], deep mixing [21][22][23], and stiffening method [24,25].…”

Section: Introductionmentioning

confidence: 99%

Observed Performance of Highway Embankment over Soft Marine Clay: A Case Study in Wenzhou, China

Bian

Yan

Zhang

2020

Advances in Civil Engineering

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This paper presents a case history of observed performance of highway embankment over soft marine clay in Wenzhou, China. During the embankment construction, the changes of ground settlement, ground displacement, and lateral displacement of subsoil with the construction time were monitored and analyzed. The monitoring results indicate that the ground settlement and lateral displacement of subsoil account for about 75% in the process of embankment construction. The measured maximum values of ground settlement, ground displacement, and lateral displacement of subsoil are 37.88 mm, 21.50 mm, and 23.56 mm, respectively. After the completion of the embankment construction, the settlement gradually tended to be stable. It is suggested that the monitoring data of settlement and displacement of embankment are smaller than the design requirements, and the embankment stability is also ensured.

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“…Many researchers have recognized that stress-path testing can be useful in exploring and investigating the failure mechanism of soil either through perspective of stress-strain relationship or through pore pressure behaviour [44]. Jiang et al [45] studied the deformation characteristics of natural loess from Jingyang, about 13 km north of Xi'an, Shaanxi Province, China, under the stress paths around a shield tunnel [46][47][48][49][50][51][52][53]. ey concluded that in a complete unloading path, the natural loess behaves in a linear elastic manner, whereas in a complete loading path, the natural loess presents nonlinear and plastic behaviour.…”

Section: Introductionmentioning

confidence: 99%

The Use of Agricultural Waste Straw to Enhance Loess Shearing Behaviour: An Experimental Investigation

Wang

Cheng

Xue

2020

Advances in Materials Science and Engineering

Self Cite

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Strata erosion in northwest China has become an engineering concern as a result of overdevelopment of land. This issue is more distinct for loess soil than other soils since it is characterised by metastable microstructure, high porosity, and water sensitivity. This study explores the potential for the use of agricultural waste straw as a recycled reinforcement material to form the enhanced shearing behaviour towards preventing instability of the loess body. The stress-strain relation and the pore pressure behaviour of Lantian loess and reinforced Lantian loess were studied using the conventional triaxial compression (CTC) stress path for three different confining pressures. Comparison with Jingyang loess and Delhi silt of similar relative fraction of silt to clay, sheared under the reduced triaxial compression (RTC) stress path and the reduced triaxial extension (RTE) stress paths, respectively, was conducted, with emphasis on strength uniqueness and critical state behaviour, to shed light on the effect of waste straw inclusions. The results indicate that the stress path in undrained compression and extension tests had a pronounced effect on the stress-strain relation of the studied soils. Insertion of the waste straw in Lantian loess restrained the development of volumetric deformation, producing higher pore pressures than Lantian loess (unreinforced). This study explores an exciting potential for the use of agricultural waste straw to prevent instability of the loess body in hilly-gullied regions of northwest China when subjected to quick surface thick fills.

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The use of tunnelling parameters and spoil characteristics to assess soil types: a case study from alluvial deposits at a pipejacking project site

Cited by 44 publications

References 36 publications

Influence of Water Inrush from Excavation Surface on the Stress and Deformation of Tunnel‐Forming Structure at the Launching‐Arrival Stage of Subway Shield

Influence of Water Inrush from Excavation Surface on the Stress and Deformation of Tunnel‐Forming Structure at the Launching‐Arrival Stage of Subway Shield

Observed Performance of Highway Embankment over Soft Marine Clay: A Case Study in Wenzhou, China

The Use of Agricultural Waste Straw to Enhance Loess Shearing Behaviour: An Experimental Investigation

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