Effect of spatial variability on short- and long-term behaviour of axially-loaded cement-admixed marine clay column

Pan, Yutao; Liu, Yong; Xiao, Hao; Lee, Fook Hou; Phoon, Kok Kwang

doi:10.1016/j.compgeo.2017.09.006

Cited by 53 publications

(9 citation statements)

References 34 publications

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“…e former leads to the formation of a continuous wall with high strength and low permeability through cement hydration and a pozzolanic reaction within a certain curing time [19]. However, deep-mixed or jetgrouted mixing piles usually have random untreated areas due to inevitable error though they were installed with due discretion [20][21][22][23][24][25][26]. ese untreated areas have an adverse effect on the strength and water-tightness of the treated ground [24,25,[27][28][29].…”

Section: Project Overviewmentioning

confidence: 99%

“…ere may have been two reasons for this: (1) is location was at the bottom boundary of the cement/soil reinforced zone, and its temperature was easily reduced by the conductivity of the low-temperature soil in the surrounding untreated zone. (2) Due to the axial o set [22,23,28], the improvement e ect of the triple-shaft cement mix pile was not good, and it was di cult to form a uniform cement/soil improvement zone [21]. erefore, the cement hydration heat was less than the upper part.…”

Section: Analysis Of Original Ground Temperature In the Verticalmentioning

confidence: 99%

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Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large‐Diameter Shield Tunnel

Liu

Pan

et al. 2019

Advances in Civil Engineering

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When a large-diameter shield tunnel boring machine enters or exits a tunnel, the newly exposed tunnel face is prone to instability and water seepage. In order to prevent collapse of the tunnel face, local ground improvement can be used until the permanent tunnel lining can be installed. The tunnel launching project of the Nanjing Metro Line 10 cross-river tunnel had a high stability requirement for the entry and exit phases. To this end, this project used a combination of cement treatment and ground freezing methods. In this project, field measurement of the vertical freezing improvement of the large-diameter shield tunnel was carried out. The temperature distribution and ground surface deformation of the vertical frozen soil wall at the end of the tunnel during the active freezing and maintenance freezing periods were analyzed in detail. The result shows that the surface settlement and seepage were successfully controlled by the combined cement treatment and ground freezing. On the other hand, the combination of cement treatment and ground freezing helps to control the freezing-induced heaving. The hydration heat in improved ground leads to an increase in ground temperature and this leads to additional freezing duration. It was examined that the frozen soil wall and the enclosure structure were in a good cementation condition. These measured values provide guidance on the timing of the shield departure. The project results confirmed that instability and water permeation did not occur in the tunnel face during the subsequent excavation.

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Section: Project Overviewmentioning

confidence: 99%

Section: Analysis Of Original Ground Temperature In the Verticalmentioning

confidence: 99%

Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large‐Diameter Shield Tunnel

Liu

Pan

et al. 2019

Advances in Civil Engineering

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“…For deep mixing, pioneering work was done by Honjo (1982). The need for reliability-based design procedures for deep mixing has been discussed by Larsson et al (2005), Terashi and Kitazume (2009), and Pan et al (2018), among many others.…”

Section: Introductionmentioning

confidence: 99%

Reliability-Based Verification of Serviceability Limit States of Dry Deep Mixing Columns

Spross

Bergman

Larsson

2021

J. Geotech. Geoenviron. Eng.

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“…The stabilization of soil by cementitious agents such as lime, cement and fly ash to obtain excellent engineering performance [15][16][17], has developed into a mature technology around the world [18][19][20][21][22][23]. Lime is commonly applied to improve the fine-grained soils due to its technical efficiency and low cost [24,25].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Shear Strength Parameters of Lime Stabilized Loess

et al. 2019

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Loess is a typical collapsible soil, which is widely distributed in the upper and middle areas around the Yellow River of China. The stabilization of loess with lime provides a significant improvement in the physical and the mechanical characteristics of the loess and is therefore widely used in the pavement base and subgrade. Therefore, a systematic investigation of Mohr-Coulomb failure envelope of lime stabilized loess needs to be conducted. In this pursuit, the present research envisages the investigation of the effects of the lime content, porosity and curing time on the strength parameters (friction angle (φ) and cohesion (c)), using a series of triaxial tests performed on lime stabilized loess specimens. The experimental results revealed that the friction angle (φ) was independent of the lime content, the porosity and the curing time of the specimen for a given lime stabilized loess, while the factors mentioned above had a significant effect on the cohesion (c) of the lime stabilized loess. For a relatively short curing time (7 days), the change in the lime content did not present an obvious effect on the cohesion (c) of the stabilized loess. However, when the curing time (28, 90 and 180 days) was longer, the increase of the lime content significantly enhanced the cohesion of the stabilized loess. When the lime content was constant, the cohesion (c) of the stabilized loess increased linearly with the decrease in the void ratio. A power function equation was proposed to assess the comprehensive influences of the factors like the lime content, porosity and curing time on cohesion (c). Finally, the Mohr-Coulomb failure envelopes were drawn based on the triaxial test for 47 specimens with various curing time and confining pressure, and the shear strength parameters obtained by the proposed equation were also compared with the experimental results.

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Effect of spatial variability on short- and long-term behaviour of axially-loaded cement-admixed marine clay column

Cited by 53 publications

References 34 publications

Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large‐Diameter Shield Tunnel

Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large‐Diameter Shield Tunnel

Reliability-Based Verification of Serviceability Limit States of Dry Deep Mixing Columns

Experimental Investigation on Shear Strength Parameters of Lime Stabilized Loess

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