Modelling liner forces response to very close-proximity tunnelling in soft alluvial deposits

Cheng, Wen-Chieh; Li, Ge; Ong, Danny; Chen, Shong-Loong; Ni, James C.

doi:10.1016/j.tust.2020.103455

Cited by 33 publications

(6 citation statements)

References 63 publications

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“…In recent years, lower-grade biopolymers have been successfully used in soil improvement work [18]. Successful identification of new products or bacteria strains [208] would enhance productivity as well as applying a wider use of technological tools [209] incorporating soil improvement methods [210] and would thus provide another major step towards mass application on real-life projects [211][212][213][214][215].…”

Section: Prospects and Limitations Of Biopolymer In Soil Treatmentmentioning

confidence: 99%

Biopolymers as Green Binders for Soil Improvement in Geotechnical Applications: A Review

et al. 2021

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Soil improvement using biopolymers has attracted considerable attention in recent years, with the aim to reduce the harmful environmental effects of traditional materials, such as cement. This paper aims to provide a review on the environmental assessment of using biopolymers as binders in soil improvement, biopolymer-treated soil characteristics, as well as the most important factors affecting the behavior of the treated soil. In more detail, environmental benefits and concerns about the use of biopolymers in soil improvement as well as biopolymer–soil interaction are discussed. Various geotechnical properties are evaluated and compared, including the unconfined compressive strength, shear strength, erosion resistance, physical properties, and durability of biopolymer-treated soils. The influential factors and soil and environmental conditions affecting various geotechnical characteristics of biopolymer-treated soils are also discussed. These factors include biopolymer concentration in the biopolymer–soil mixture, moisture condition, temperature, and dehydration time. Potential opportunities for biopolymers in geotechnical engineering and the challenges are also presented.

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Section: Prospects and Limitations Of Biopolymer In Soil Treatmentmentioning

confidence: 99%

Biopolymers as Green Binders for Soil Improvement in Geotechnical Applications: A Review

et al. 2021

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“…Advancements in construction material science considering sustainability [1][2][3][4][5][6] and the characterisation of soils form the basis of geoenvironmental and geotechnical design but not without challenges faced in laboratory tests [7,8], computer simulations [9,10] and inferior in situ geomaterial conditions requiring conditioning and improvement [11][12][13][14][15][16]. For example, many projects, such as the construction of coastal facilities, such as shipyard [17] and quay walls, deep excavation [18][19][20] or foundations for building basements [21,22], road embankments on flood plains [23,24] and tunnelling [25][26][27][28] require infrastructure to be built on areas with widespread soft soil deposits [29][30][31][32]. In Brisbane, Queensland, Australia, dubbed the 'river city', soft estuarine clays can be found in embankments supporting main motorways, the Brisbane airport and the Port of Brisbane.…”

Section: Introductionmentioning

confidence: 99%

Strength and Microstructural Assessment of Reconstituted and Stabilised Soft Soils with Varying Silt Contents

Liu

et al. 2021

Geosciences

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The study of the strength of reconstituted and stabilised soft soils is very important in geotechnical engineering. The soil particles, such as clay, sand, and silt play important roles in determining the behaviour of soils. The behaviour of clay and sand particles are unique; however, the behaviour of silt particles lie in a transitional form between sand and clay. Therefore, this paper seeks to investigate (a) the effect of silt contents on the strength of soft soils; (b) the effect of silt content on the strength of cement-stabilised soft soils; and (c) the microstructure of the soft soil specimens stabilised by cement with varying particle size distribution. A series of tests consisting in consolidated, isotropic undrained (CIU) triaxial tests, unconfined compressive strength (UCS) tests, and scanning electron microscope (SEM) images were conducted in this study to achieve these objectives. In conclusion, the relationship between the silt content and critical state behaviour of soft soils (both clay and silt particles) are proposed. For the cement-stabilised specimens, the unconfined compressive strength increases with the increase in silt content when the cement content is 10%. However, the UCS decreases with the increase in silt content when cement content is 30%. With cement content ranging from 15–25%, the UCS increases at first with the increase of silt content but decreases once the silt content reaches a ‘saturation’ point.

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“…Newly built metro tunnels underpassing through the upper existing buildings (structures) and traffic lines are common engineering problems in urban infrastructure construction [1][2][3]. During the construction of metro tunnels, it is very easy to cause large surface settlement, which will threaten the safety of existing buildings (structures) and traffic lines on the upper part [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Construction Sequence Optimization and Settlement Control Countermeasures of Metro Tunnels Underpassing Expressway

Zhang

Pei

et al. 2021

Advances in Civil Engineering

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The Chongqing metro line 6 underpass expressway around the city is taken as an engineering background, and the optimal excavation sequence and corresponding control countermeasures for the triangular-distributed three-line metro tunnel underpass expressway are studied. The influences of excavation sequence on the tunnel surrounding rock deformation, surrounding rock stress, supporting structure stress, plastic zone, and surface settlement are analyzed by using MIDAS/GTS NX finite element software. The numerical simulation results showed that Case 1 is the optimal excavation sequence of the metro tunnel. However, the surface settlement under the optimal excavation sequence exceeds the limit value of 30 mm, which cannot guarantee the safety of expressway traffic. On this basis, the control measure for strengthening the three-line tunnels with advanced small pipe grouting and reinforcing the middle tunnel with concrete-filled steel tube piles are proposed. Moreover, the excavation process of the metro tunnel with and without reinforcement schemes is numerically simulated. The results show that the reinforcement scheme can effectively control the surface settlement value within the limited value (16.47 mm), which is close to the maximum surface settlement of 18.31 mm after the metro tunnel excavation is completed, indicating that the proposed reinforcement scheme is beneficial to ensure the safety of metro tunnel construction and the driving safety of the expressway.

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Modelling liner forces response to very close-proximity tunnelling in soft alluvial deposits

Cited by 33 publications

References 63 publications

Biopolymers as Green Binders for Soil Improvement in Geotechnical Applications: A Review

Biopolymers as Green Binders for Soil Improvement in Geotechnical Applications: A Review

Strength and Microstructural Assessment of Reconstituted and Stabilised Soft Soils with Varying Silt Contents

Construction Sequence Optimization and Settlement Control Countermeasures of Metro Tunnels Underpassing Expressway

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