Probabilistic investigation on defective jet-grouted cut-off wall with random geometric imperfections

Pan, Yutao; Liu, Y.; Chen, E. J.

doi:10.1680/jgeot.17.p.254

Cited by 40 publications

(27 citation statements)

References 16 publications

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“…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]. In the latter case, the temperature of the surrounding soil is lowered to freezing point by a supply of low-temperature-concentrated saline solution into the freezing pipe, so that the pore water of the soil is frozen, thereby temporarily improving the strength and watertightness of the soil.…”

Section: Project Overviewmentioning

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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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%

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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“…Soft soil is widely distributed in coastal areas with many defects such as large natural moisture content, excessive compression capacity, and poor bearing capacity [1][2][3]. In geotechnical engineering, deep mixing method is generally adopted to improve the strength of soil by adding cement to the soil [4][5][6][7][8]. The soft soil is reinforced to impart higher strength through a series of reactions between raw materials and curing agent [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Models for Stress–Strain Behavior of Nano Magnesia-Cement-Reinforced Seashore Soft Soil

Wang

Zhang

et al. 2020

Mathematics

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The stress–strain behavior of nano magnesia-cement-reinforced seashore soft soil (Nmcs) under different circumstances exhibits various characteristics, e.g., strain-hardening behavior, falling behavior, S-type falling behavior, and strong softening behavior. This study therefore proposes a REP (reinforced exponential and power function)-based mathematical model to simulate the various stress–strain behaviors of Nmcs under varying conditions. Firstly, the mathematical characteristics of different constitutive behaviors of Nmcs are explicitly discussed. Secondly, the conventional mathematical models and their applicability for modeling stress–strain behavior of cemented soil are examined. Based on the mathematical characteristics of different stress–strain curves and the features of different conventional models, a simple mathematical REP model for simulating the hardening behavior, modified falling behavior and strong softening behavior is proposed. Moreover, a CEL (coupled exponential and linear) model improved from the REP model is also put forth for simulating the S-type stress–strain behavior of Nmcs. Comparisons between conventional models and the proposed REP-based models are made which verify the feasibility of the proposed models. The proposed REP-based models may facilitate researchers in the assessment and estimation of stress–strain constitutive behaviors of Nmcs subjected to different scenarios.

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“…Vertical cutoff walls are usually used to impede the horizontal migration of the leachate [11][12][13][14]. Backfills with low permeability (e.g., soil-bentonite slurry and cement-bentonite slurry) are usually used to fill preexcavated trenches to form continuous barriers.…”

Section: Introductionmentioning

confidence: 99%

“…PVA facilitates the dispersion of bentonite slurry [25]. is helps to improve the homogeneity of the slurry and hence the overall cutoff performance of the cutoff wall [14]. PVA was found to be able to coat the surface of the grains, increasing the adsorption capability and reducing the permeability of the slurry [26].…”

Section: Introductionmentioning

confidence: 99%

Application of a Bentonite Slurry Modified by Polyvinyl Alcohol in the Cutoff of a Landfill

Dai

Sheng

Pan

et al. 2020

Advances in Civil Engineering

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Soil-bentonite cutoff walls are usually used to contain the contaminants of landfills. The pumpability, permeability, and adsorption capability of the slurry are all crucial to the performance of the cutoff wall. In this study, the effect of polyvinyl alcohol (PVA) was used to improve the performance of bentonite slurry. A series of lab tests were conducted to evaluate the pumpability, permeability, and adsorption capacity with different concentrations of PVA treatment. Results show that the addition of PVA can increase the fluidity and pumpable period of slurry, which facilitates the casting and grouting during construction. The addition of PVA also helps to reduce the permeability coefficient of slurry and improve the adsorption capability which enhances the cutoff performance of the walls.

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Probabilistic investigation on defective jet-grouted cut-off wall with random geometric imperfections

Cited by 40 publications

References 16 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

Mathematical Models for Stress–Strain Behavior of Nano Magnesia-Cement-Reinforced Seashore Soft Soil

Application of a Bentonite Slurry Modified by Polyvinyl Alcohol in the Cutoff of a Landfill

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