Numerical analysis of lateral movements and strut forces in deep cement mixing walls with top-down construction in soft clay

Jamsawang, Pitthaya; Jamnam, Sittisak; Jongpradist, Pornkasem; Tanseng, Pornpot; Horpibulsuk, Suksun

doi:10.1016/j.compgeo.2017.03.018

Cited by 53 publications

(9 citation statements)

References 30 publications

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“…For soft clay improvement by deep cement mixing using either mechanical mixing or jet grouting techniques, high cement content is required as the water-to-cement ratio is the strength-controlled parameter [16]. Particularly, when the high strength of the mixture is required such as for slope protection of road or canal embankment [17,18], foundations of road, low-rise building, or small bridge [19,20], or deep excavation support [21,22], an extremely high cement content must be employed since the strength increase becomes less with increasing cement content at a specific water content.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Rice Husk Ash as Cementitious Material in High‐Strength Cement‐Admixed Clay

Jongpradist

Homtragoon

Sukkarak

et al. 2018

Advances in Civil Engineering

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e potential and efficiency of using rice husk ash (RHA) to add up or partially replace Portland cement in deep cement mixing technique are examined. A series of unconfined compression tests on cement-RHA-stabilized clay are conducted to investigate the influence of RHA on the mixture properties. Special attention is paid to its efficiency for increasing the strength by partial cement replacement to obtain high-strength soil cement, and it is compared with fly ash. Test results indicate that up to 35% of RHA could be advantageously added up to enhance the strength if the cement content in the mixture is larger than 10%. e RHA enhances the strength of cement-admixed clay by larger than 100% at 28 days. For curing time of 14 and 28 days, the RHA exhibits higher efficiency on Portland cement replacement when the cement and overall cementitious contents are not less than 20 and 35%, respectively. e optimum condition for high-strength mixture is achieved when RHA is added to the 20% cement content mixture. When compared with fly ash of similar grain size, the efficiency of RHA is higher when the content to be added is greater than 15%. is indicates the suitability of RHA for use in high-strength soil-cement.

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Section: Introductionmentioning

confidence: 99%

Efficiency of Rice Husk Ash as Cementitious Material in High‐Strength Cement‐Admixed Clay

Jongpradist

Homtragoon

Sukkarak

et al. 2018

Advances in Civil Engineering

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“…Besides, the relationship between the undrained shear strength, S u , and ultimate shear strength, q u , is as follows: q u = 2S u . [92][93][94] In detail, this is illustrated in Figure 15, and the splitting tensile strength of the DCM columns was proposed as 0.23q u , 95 which was considered using the tension cut-off in the model. The undrained type C term as mentioned above is also adopted to model the undrained behavior of the DCM columns using total stress analysis.…”

Section: Engineering Parameters Of Cdm Columnsmentioning

confidence: 99%

A nonlinear optimization method for calibration of large‐scale deep cement mixing in very soft clay deep excavation

To,

Minh,

Huynh

et al. 2024

Num Anal Meth Geomechanics

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This work proposes a novel technique to conduct back‐analysis of lateral displacement of deep cement mixing (DCM) columns in deep excavation construction. For the first time, we propose a process to investigate both soil and underground structure end‐to‐end automatically. The novel technique is a complex combination of three crucial factors: (1) a nature‐inspired optimization algorithm (O), (2) a three‐dimensional PLAXIS Geotechnical Engineering software (P) and (3) a modern Python language programming (P), hereinafter called the a nature‐inspired optimization algorithm (O), a three‐dimensional PLAXIS Geotechnical Engineering software (P) and a modern Python language programming (P) (OPP) technique. The novel meta‐heuristic algorithm simulated the co‐evolved partnership behavior of shrimps and goby fishes, termed Shrimp and Goby Association (SGA), which plays an important role in complex analyses. A series of exams to determine the SGA's performance is conducted on 38 benchmark test functions (IEEE Congress on Evolutionary Computation 2017 and 2019) and three real‐world engineering design problems to showcase its applicability. The metaheuristic and PLAXIS 3D analysis work well together, which makes the back‐analysis technique powerfully to determinate stiffness parameters instead of the traditional approaches. Based on the optimized parameters, the lateral deflection of DCM and soil are well predicted for excavation. This study proposes a technique to estimate efficiently the stiffness parameter for very soft soil. As a consequence of the optimization process, an equation to determine the stiffness parameter of DCM columns from laboratory test is also proposed. Based on the obtained results, this research provides a comprehensive methodology for predicting risk, enhancing safety, saving time and money, and effectively designing and constructing underground structures.

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“…e technology principle and the operation process of the top-down construction are fully used for reference in the construction technology of the underground space in existing buildings, which can be regarded as the extension of the application for the top-down method technology in foundation pit engineering [1][2][3][4][5]. Generally, the overall operation process is as follows: first, the surrounding enclosure structure and the vertical support system are constructed; then, the earthwork excavation is carried out in the process of top-down construction, and the horizontal supporting structures such as underground beams and slabs are constructed at the same time; then, the foundation slab is poured to the base elevation after the excavation; finally, the vertical bearing components such as the basement exterior wall, the column, and the wall are constructed.…”

Section: Introductionmentioning

confidence: 99%

Study on Bearing Capacity of the Existing Engineering Pile Group without Lateral Displacement during Dynamic Top‐Down Construction

Wang

Zhao

Xuelin

et al. 2022

Advances in Civil Engineering

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The bearing capacity of the vertical underpinning structure system is the key index in the design of top-down construction for adding a basement layer under existing buildings. The influence of the lateral restraint is the most significant under the dynamic construction excavation. For the problem of the bearing capacity of the existing engineering pile group under the top-down construction, the linear eigenvalue stability method was used first to study the influence of the lateral restraints such as the horizontal resistance of soil, the diameter of piles body, and the bending rigidity of the temporary steel bracing on its bearing capacity. The corresponding critical stability load and the effective length coefficient were then obtained. Then, based on the nonlinear extreme point stability method with the initial geometrical imperfection, the amplification range for the effective length coefficient was studied. Finally, based on the current Chinese Code Formula (JGJ 94-2008) and considering the influence of the compression buckling effect of the high cap pile, the present solution of the bearing capacity for the pile body was obtained and compared with the code solution. It turns out that the nonlinear bearing capacity of existing engineering piles group with initial imperfection is smaller than the critical stability load of the linear eigenvalue and increases with the increase of the imperfection amplitude, and the amplification range of the effective length coefficient is 1.10∼1.20. The present solution of the bearing capacity with the compression buckling effect is 1.10∼1.30 times of the code solution, which shows that the code solution is partial to safety, and the residual bearing can be properly considered in the design.

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Numerical analysis of lateral movements and strut forces in deep cement mixing walls with top-down construction in soft clay

Cited by 53 publications

References 30 publications

Efficiency of Rice Husk Ash as Cementitious Material in High‐Strength Cement‐Admixed Clay

Efficiency of Rice Husk Ash as Cementitious Material in High‐Strength Cement‐Admixed Clay

A nonlinear optimization method for calibration of large‐scale deep cement mixing in very soft clay deep excavation

Study on Bearing Capacity of the Existing Engineering Pile Group without Lateral Displacement during Dynamic Top‐Down Construction

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