Prediction of Ground Settlement Induced by Slurry Shield Tunnelling in Granular Soils

Ayasrah, Mo’men; Qiu, Hongsheng; Zhang, Xiedong; Daddow, Mohammad

doi:10.28991/cej-2020-03091617

Cited by 25 publications

(8 citation statements)

References 15 publications

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“…It can be caused by low particle bonding, extreme slope, excess water, extreme dimension of a slope, and overloading [1]. A settlement may cause the building to be damaged or influencing a building's serviceability of the construction [2] [3]. The main cause is the soil's tendency to be compressible, excessive swelling potential, low level of shear strength, permeability, bearing capacity, and lack of particle bonding on a high water content condition [4], [5].…”

Section: Literature Reviewmentioning

confidence: 99%

Stabilization of Gedebage Expansive Soil on Shear Strength Using Vermiculite and Emulsified Asphalt

Amarta¹,

Syahril²

2021

Proceedings of the 2nd International Seminar of Science and Applied Technology (ISSAT 2021)

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A construction failure might be caused by so many factors, one of them is the poor properties of the subgrade. A subgrade with low bearing capacity and low shear strength can cause a large settlement. This problem usually occurs in an area where the soil receives too much water. The settlement phenomena can lead to forming a crack on any construction above it. On a sloped area or steep area, high soil shear strength prevents land sliding from occurring. To overcome soil problems mentioned before, stabilization is needed to improve soil's properties. In this research, soil stabilization is done by adding vermiculite to absorb excess moisture content. Silica in vermiculite can also improve soil's poor physical and mechanical behaviour. Meanwhile, the second additive is emulsified asphalt that acts as the adhesive substance to increase particle bonding of the soil. Emulsified asphalt percentage in this research is constant on 8% of the soil's weight, and the vermiculite varies from 3%, 5%, and 7% of the soil's weight. This research used soft soil and aimed to obtain the effect of stabilization mixture on soil's shear strength. Shear strength is a result of triaxial testing to get shear angle value and cohesion value. Shear angle represents the soil's ability to form friction to withstand sliding and the cohesion represents the soil boding for each particle. The expected result from this stabilization is in a certain percentage of emulsified asphalt and vermiculite mixture can strengthen the soil by increasing the shear angle and cohesion of the soil on the triaxial test, so the poor soil characteristic and strength will be improved.

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Section: Literature Reviewmentioning

confidence: 99%

Stabilization of Gedebage Expansive Soil on Shear Strength Using Vermiculite and Emulsified Asphalt

Amarta¹,

Syahril²

2021

Proceedings of the 2nd International Seminar of Science and Applied Technology (ISSAT 2021)

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“…Shirkhani et al [ 19 – 23 ] studied the seismic damping systems for structures and evaluated their effectiveness. In addition, the dynamic soil characteristics and seismic response law of underground structures under special soil conditions were also investigated through various research methods by some scholars, such as liquefiable soil [ 24 – 28 ], soft soil [ 29 – 33 ], and other special soils [ 34 – 36 ].…”

Section: Introductionmentioning

confidence: 99%

Damage and failure of underground subway stations under different soil constraint conditions

Zhang

et al. 2023

PLoS ONE

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Investigations from past earthquakes have shown that underground subway stations can suffer excessive deformation under strong seismic loads, leading to the damage of critical components and the collapse of structures. This study presents the results of finite element analyses on the seismic damage of underground subway stations installed under different soil constraint conditions. The plastic hinge distribution and damage characteristics of cut and cover double-storey and three-storey subway stations are analyzed using the finite element method software ABAQUS. Combined with the static analysis results of the column sections, a discriminant method for bending plastic hinges is presented. The numerical results show that the collapse of the subway stations begins with the failure of the bottom columns’ bottom sections, which leads to the bending of the plates and the destruction of the whole structure. The bending deformation at the end section of columns has an approximatively linear relationship with the inter-storey drift ratio, and the change in soil conditions shows no apparent influence. The sidewall deformation behavior varies significantly under different soil conditions, and the bending deformation at the bottom section of sidewalls increases along with an increase in the soil-structure stiffness ratio at the same inter-storey drift deformation level. The sidewall bending ductility ratio of the double-storey and three-storey stations at the elastic-plastic drift ratio limit increases by 61.6% and 26.7%, respectively. In addition, the fitting curves between the component bending ductility ratio and inter-storey drift ratio based on the analysis results are also presented. The findings may provide a helpful reference for the seismic performance evaluation and design of underground subway stations.

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“…Shield machine can effectively ensure the safety of tunnel surrounding rock structure in tunnel excavation. And it realized a series of construction operations such as slag removal, tunnel stacking and tunnel wall maintenance in one side excavation to meet the requirements of efficient tunnel construction [2], [3]. However, in the construction of shield tunnel, the underground soil layer will be disturbed, which results in changes in the structure of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal deformation of Shield tunnel based on construction monitoring data

Yao¹

2023

J. vibroeng.

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The rapid development of urbanization has changed the traffic and transportation in the central area. The change of the surrounding rock and structural stress state of the project under construction caused by the tunnel construction in the same period has caused great harm to its safe use and casualties. Shield construction technology can achieve safe excavation and lining, with high degree of automation. And it is a relatively common construction method at present. But its adaptability to section size and section environmental conditions is poor. In view of this, from the analysis of construction monitoring data, the study established a longitudinal model considering lateral effects from the perspective of lateral characteristics. It also achieved stress assessment and improvement through lateral deformation calculation, segment ring bolt calculation and formula correction. The experimental results showed that the opening at the circumferential seam of the right line of the test tunnel under this method is 8.9 mm. The radius of curvature is 758 mm, and the safety assessment level of longitudinal deformation is 3. This method can effectively guarantee the safety of shield tunnel construction and has good guiding value for tunnel management and maintenance.

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Prediction of Ground Settlement Induced by Slurry Shield Tunnelling in Granular Soils

Cited by 25 publications

References 15 publications

Stabilization of Gedebage Expansive Soil on Shear Strength Using Vermiculite and Emulsified Asphalt

Stabilization of Gedebage Expansive Soil on Shear Strength Using Vermiculite and Emulsified Asphalt

Damage and failure of underground subway stations under different soil constraint conditions

Longitudinal deformation of Shield tunnel based on construction monitoring data

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